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Nickel Catalysts Supported on Acetylene Black for High-Efficient Electrochemical Oxidation and Sensitive Detection of Glucose
Nanoscale Research Letters volume 15, Article number: 23 (2020)
Electrocatalytic glucose oxidation is a very important reaction in glucose fuel cell and medical diagnosis, which is limited by sluggish reaction kinetics and low diffusion coefficient. Herein, a composite (donated as Ni6/AB) consisting of atomically precise nickel catalyst with defined crystal structure [Ni6(SC12H25)12] and acetylene black(AB) has been initiated as a novel and high-efficient non-noble metal catalyst for the electrochemical oxidation of glucose benefiting from its high exposure of active sites and increased electron/mass transport. The present Ni6/AB composites display the onset potential of +1.24 V and the maximum current density of 5 mA cm−2 at the potential of +1.47 V in the electrolyte of 0.1 M KOH with 5 mM glucose. This electrochemical performance is much superior to the alone nickel catalysts, acetylene black, and previous reported nanomaterials. Furthermore, the obtained Ni6/AB composites are also expected to find important application in the electrochemical detection of glucose due to its high electrochemical performance. The sensitivity and the detection of limit are determined to be 0.7709 mA cm−2 mM−1 and 1.9 μM, respectively. Our study demonstrates that atomically precise nickel catalysts on acetylene black could be potential promising materials for next-generation energy devices and electrochemical sensors.
Recently, glucose fuel cell (GFC) has been considered as an ideal renewable energy device due to the non-toxicity, cleanliness, and huge theoretical energy density (4430 Wh/kg) [1,2,3,4]. However, the sluggish glucose oxidation kinetics and its low diffusion coefficient at the anode are the major obstacles that must be addressed for further development of the GFCs [5, 6]. On the other hand, the effective determination of glucose concentration is extremely necessary in the diagnosis and treatment of diseases such as diabetes and hyperglycemias, since glucose is vital living matter for human beings [7,8,9]. Currently, among the various analytical techniques for the detection of glucose, non-enzymatic electrochemical sensing methods are recognized as the most promising one because of the simple device design, high selectivity, and fast response ability [10,11,12,13]. Meanwhile, the sensitivity and detection limit of this method can be largely regulated and controlled by the electrode catalysts [14, 15]. Therefore, it is of great importance to develop high efficient electrocatalyst, especially with bifunctional properties for oxidation and detection of the glucose in the GFCs and glucose biosensors.
To date, different functional materials have been reported as electrocatalysts for the electrochemical oxidation and detection of glucose, including CuCo2S4 nanosheets grown on carbon fiber , platinum nanowires anchored on graphene-supported platinum nanoparticles , Co3O4 nanocrystals , and CuO nanorods derived from metal-organic framework. Recently, because the low valence state Ni(II) can be transformed to strong oxidizing high valence state Ni(III) species by electrochemically oxidation process, which can catalyze the glucose to gluconolactone and go back to Ni(II) at the same time, nickel-based materials gradually become a star catalyst for high efficient electrochemical glucose reaction [18,19,20]. For example, 1D NiMoO4 nanofibers designed by Wang et al were applied in the detection of glucose, exhibiting low oxidation potential (+ 0.5 V) and comparable sensitivity (193.8 μA mM−1 cm−2) . To improve the glucose sensing performance, Xia et al prepared a three-dimensional flower-like Ni7S6 material with the sensitivity of 271.80 μA mM−1 cm−2 . Furthermore, Xu et al increased the detection sensitivity to 346 μA mM−1 cm−2 on the basis of a novel Ni(OH)2@PEDOT-rGO nanocomposites as electrocatalysts for glucose sensing . Nevertheless, to promote the practical application of GFCs and sensitive detection of glucose, the electrochemical performance of nickel-based electrocatalysts is still a large room for improvement.
Generally speaking, the electrochemical performances of the catalysts can be enhanced by increasing the number of catalytic active sites in material structural units . This, in turn, means the preparation of electrocatalysts with abundant active sites, namely, metal nanoclusters, single-atom catalysts, and metalloploymer . In recent years, owing to the high exposure of metal atoms and unambiguous geometric structure, atomically precise metal nanoclusters have attracted much attention from electrochemical glucose oxidation and sensing areas [26,27,28,29,30,31]. For example, He et al reported that the highly dispersed Pt nanoclusters anchored graphene composites showed the sensitivity of 71.9 μA mM−1 cm−2 and response potential of +0.1 V for glucose reaction . Yang et al found that the alloy Pd-Au bimetallic nanoclusters can slightly increase the sensitivity to 75.3 μA mM−1 cm−2 . Devoting to the efforts into non-noble metal nanoclusters, Chen et al studied that the sub-nanometer sized Cu6(GSH)3 clusters for electrochemical oxidation and detection of glucose, which exhibited the maximum oxidation peak of +0.5 V and the sensitivity of 15.1 μA mM−1 cm−2 . Thus, it can be seen that the sensitivity of metal nanoclusters toward glucose sensing is still to be improved, especially that from non-noble metal nanoclusters. In addition, it is worthy to be mentioned that the stability of metal nanoclusters for electrochemical reaction should also be enhanced, which was not displayed in most of previous reports.
In this work, on the basis of the nickel-based materials’ inherent properties, high exposure of metal atoms in nanoclusters and extremely stable crown structure, an atomically precise nickel catalyst (Ni6(SC12H25)12) supported on acetylene black was examined for electrochemical glucose oxidation. The results showed that both of cyclic voltammetry and linear sweep voltammetry from Ni6/AB composites curves presented a prominent oxidation current peak in the electrolyte of 0.1 M KOH with 5 mM glucose in the potential range of +1.165 V to +1.615 V, when compared to the pure electrolyte of 0.1 M KOH. The onset potential and peak current position was respectively determined at about +1.24 V and around +1.47 V, which are much superior to that from the previous nickel-based materials. Moreover, based on the preeminent electrochemical activity, the electrode decorated by the present Ni6/AB composites also achieved the selectivity detection of glucose with the sensitivity of 0.7709 mA cm−2 mM−1, much higher than the value from most of the reports. We hope that the successful application of atomically precise nickel catalysts on acetylene black in glucose oxidation can push forward the development of GFCs and glucose sensors.
Methods and experiments
Chemicals and materials
Nickel nitrate hexahydrate (Ni(NO3)2.6H2O), dedecanethiol (C12H25SH), sodium borohydride (NaBH4), tetramethylene (THF), methanol (CH3OH), hexane (C6H12), dichloromethane (CH2Cl2, DCM), and ethanol (CH3CH2OH) were purchased from Aladdin. Tetra-n-octylammonium bromide ((C8H17)4NBr, TOABr) and acetylene black (AB) were bought from Alfa Aesar. Potassium hydroxide (KOH), glucose (C6H12O6), citric acid (C6H8O7, CA), uric acid (C5H4N4O3, UA), sucrose (C12H22O11, Suc), and sodium chloride (NaCl) were obtained from Beijing Chemical Reagent. The water used in the whole experiments was produced by a Water Purifier Ultrapure water system (18.25 MΩ cm). All glass vessels were immersed in aqua regia overnight and then rinsed with massive ultrapure water.
Syntheses of the atomically precise nickel catalysts (Ni6(SC12H25)12)
Herein, the preparation of the atomically precise nickel catalysts, Ni6(SC12H25)12, follows the previous procedures used to synthesize Au25 and Ni6(SC2H4Ph)12 [35, 36]. Briefly, Ni(NO3)2.6H2O with the weight of 0.0623 g and 0.230 g of tetra-n-octylammonium bromide was co-dissolved in the 13 ml of THF. Then, 310 μL of dodecanethiol was added dropwise into the reaction system under the constant stirring. At this moment, the color of the mixture slowly changed from green to deep blue. After 3 h of constant stirring, 0.04 g of sodium borohydride in 5 ml ice water was poured to this solution and the reaction continued another 20 h. To obtain the product with high purity, THF was removed by rotary and evaporation, while methanol and DCM were used as washing and extracting solvent, respectively. The final product was dissolved in the DCM for further use.
Syntheses of the Ni6(SC12H25)12 supported on acetylene black (donted as Ni6/AB composites)
Acetylene black is a frequently used support for metal nanocatalysts. In this work, to eliminate the possible metal impurity, acetylene black was firstly stirring in 1 M hydrochloric acid for 12 h. Then, a large amount of distilled water was used as washing solvent until the filtrate became neutral. The obtained acetylene black was dried in vaccum oven and waited for use in the next step.
For the preparation of Ni6/AB composites, 10 mg of the above handled acetylene black was dispersed in the 20 mL DCM. Then, 2 mL, 0.5 mg mL−1of Ni6(SC12H25)12 dichloromethane solution was introduced into the mixed system, and the reaction was allowed to proceed for 24 h under constant stirring. The final product of Ni6/AB composites was collected through the centrifugation and drying at room temperature.
UV-Vis spectra were measured on a UV-3000PC spectrophotometer (Shanghai Mapada Instrumental Co., Ltd). X-Ray photoelectron spectroscopy (XPS) experiments were performed on an AVG Thermo ESCALAB 250 spectrometer (VG scientific) operated at 120 W. Fourier-transformed infrared spectroscopy (FTIR) tests were conducted on a VERTTEX 70 FTIR (KBr wafer technique). Matrix-assisted laser-desorption ionization time of flight mass spectrometric (MALDI-TOF MS) studies was completed by using a Bruker autoflexIII smartbeam MALDI-TOF/TOF-MS (Germany) and trans-2-[3-(4-tert-Butylphenyl)-2-methyl-2-propenyliene]malononitrile (DCTB) was used as the assisted matrix.
The whole electrochemical measurements in this work were accomplished by using a CHI 760E electrochemical workstation in a standard three-electrode system at room temperature. During the experiments, 0.1 M KOH was utilized as the supporting electrolyte, while an Ag/AgCl (in saturated KCl) and a graphite electrode were taken as the reference and counter electrode, respectively. For the electrochemical oxidation of glucose, rotating disk electrode (5 mm diameter) coated with the catalyst ink (30 μL, 2 mg/mL) was used as working electrode. For the glucose sensing, the working electrode was a glassy carbon electrode (3 mm diameter) loaded with 2 mg/mL, 10-μL catalyst ink. The catalyst ink was the homogeneous mixture of 2 mg Ni6/AB(or Ni6(SC12H25)12, or AB), 0.5 ml ethanol, 0.5 ml water, and 20 μL Nafion. Herein, it is worthy to be mentioned that all current densities were normalized to the geometrical area of electrode, and all measured electrode potentials versus Ag/AgCl were transformed to a reversible hydrogen electrode (RHE) scale according to the following equation:
Results and discussion
Synthesis and characterization of Ni6(SC12H25)12 and Ni6/AB composites
In the previous report, Ni6(SCH2CH2Ph)12 has been resolved to be a stable double-crown structure, and its UV-Vis spectrum clearly showed a discrete absorption curve . Therefore, Ni6(SC12H25)12 is also expected to be a double-crown structure, which will provide high catalytic activity, high sensitivity and high electrochemical stability for the following glucose reaction. Herein, to demonstrate the successful synthesis of Ni6(SC12H25)12, UV-Vis absorption spectrum and objective spherical aberration correction field emission transmission electron microscope (FE-SEM) were employed to analyze the obtained product. As shown in Fig. 1a, resulted from the interband and intraband transitions, the UV-Vis absorption curve displays three obvious absorption bands located at 335 nm, 410 nm, and 540 nm. In the FE-TEM image shown in Additional file 1: Figure S1, the tiny particle circled in red can be obviously observed. These are similar with the previously reported results from Ni6(SC2H4Ph)12, suggesting the structural consistency between the two . To obtain the precise composition of the product, matrix-assisted laser desorption ionization time-of-flight mass spectroscopy (MALDI-TOF MS) measurements were conducted and the results are presented in Fig. 1b. Obviously, the highest mass peak located at m/z 2759.06 was from the formula of [Ni6(SC12H25)12-10H]+. This indicates that the parent nickel nanocluster is Ni6(SC12H25)12, which is in the same form as the Ni6(SCH2CH2Ph)12. In MS spectrum, other smaller mass-charge ratio at the position of 2301.51, 1957.30, 1841.91, and 1623.31 can be ascribed to the fragments of parent catalyst, i.e, [Ni5(SC12H25)10-6H]+, [Ni6(SC12H25)8-5H]+, [Ni4(SC12H25)8-3H]+ and [Ni4(SC12H25)7-20H]+. Note that all the patterns from experimental mass spectrum could match well with that from the simulated one, although the accurate isotope distribution from test data was limited by instrument resolution, as shown in Fig. 1b inset and Additional file 1: Figure S2.
For enhancing the subsequent electrochemical performance, the synthesized Ni6(SC12H25)12 in this work were supported on the acetylene black and were donated as Ni6/AB composites. Herein, X-ray photoelectronic energy spectroscopy (XPS) and far infrared spectroscopy (far IR) analysis were conducted to show the formation of Ni6/AB composites. As displayed in Fig. 2a, in agreement with the components of pure Ni6(SC12H25)12, the XPS survey spectra from Ni6/AB composites clearly provide the existence of Ni, S, C, and O element. As a comparison, XPS survey spectra of pure acetylene black only involves the elements of C and O, as shown in Additional file 1: Figures S3 and S4. This suggests the successful combination of Ni6(SC12H25)12 and acetylene black. To further analyze the possible interaction in Ni6/AB composites, the deconvoluted Ni 2p spectra from Ni6(SC12H25)12 and Ni6/AB composites were presented in Fig. 2b. The fitted components show that the binding energies at 853.9 and 856.1 eV can be assigned to the Ni 2p3/2, while the binding energies of 871.1 and 873.9 eV correspond to the Ni 2p1/2 [37, 38]. This indicates that the Ni(II) constituents are existing in Ni6(SC12H25)12 and Ni6/AB composites . Interestingly, further observations find that the ratio of more positive Ni(II) component (the nickel with higher binding energy) to more negative Ni(II) component (the nickel with lower binding energy) apparently increases from 0.2:1 of Ni6(SC12H25)12 to 1:1 of Ni6/AB composites after loaded on the AB. More positive Ni(II) components may be favorable for subsequent catalytic reaction. Meanwhile, as shown in Fig. 2c, compared to that from Ni6(SC12H25)12, the S 2p signals from Ni6/AB composites also shift to the high energy direction. These imply that the electrons from metal nickel sites were shifting to AB supports, which will contribute to the enhancement of electrochemical performance, as discussed in following parts. In the far IR spectrum, as shown in Fig. 2d, the Ni-S absorption peak at 390 cm−1 simultaneously appears in the curves of Ni6/AB composites and Ni6(SC12H25)12, further evidencing the successful combination of nickel catalysts and support, in consistence with the result of XPS.
Ni6/AB composites for electrochemical oxidation of glucose
As the result of unique properties, high exposed metal atoms and stable structure, the present Ni6/AB composites were investigated for the electrochemical oxidation of glucose, while pure Ni6(SC12H25)12 and acetylene black(AB) were used for comparison. In 0.1 M KOH, the typical cyclic voltammograms (CVs) of Ni6/AB composites, Ni6(SC12H25)12, and AB are presented in Fig. 3a. Compared to the featureless CV of AB, the CVs from Ni6/AB composites and Ni6(SC12H25)12 show a pair of distinct redox characteristic peaks in the range of scanning potential from + 1.2 V to + 1.6 V. Specifically, in the positive-potential scan, the current peak around + 1.44 V or + 1.41 V can be attributed to the oxidation of Ni(II) to Ni(III), and in the reverse scan, the reduction transformations of Ni(III) to Ni(II) can be respectively found at the potential of + 1.27 V and + 1.33 V for Ni6/AB composites and Ni6(SC12H25)12 [38, 40, 41]. Note that the existence of nickel signals in CV curve also illustrated the formation of Ni6/AB composites, in consistence with the results from XPS and far IR. For the oxidation of glucose, the CVs electrochemical results were presented in Fig. 3b. Apparently, when compared to CV curve in the pure electrolyte, the CV in 0.1 M KOH with 5 mM glucose evidently provides a more negative onset potential of + 1.26 V and a larger current density peak of 4.7 mA cm−2 at the potential of + 1.47 V for Ni6/AB composites. This shows the successful and efficient catalytic oxidation of glucose on the surface of the Ni6/AB composites-modified electrode, and the obtained results is much superior to that from the previous reported materials, as listed and compared in Additional file 1: Table S1. For the contrast materials of pure acetylene black, as shown in Additional file 1: Figure S5a, the current density difference from CV is very low in 0.1 M KOH with the presence of 5 mM glucose, when compared to that in 0.1 M KOH. For the alone Ni6(SC12H25)12, a clear glucose oxidation current peak and an onset oxidation potential at + 1.29 V(close to value of Ni6/AB composites) are shown in Additional file 1: Figure S5b. Combing the CV results from the three materials, it can be inferred that the Ni6/AB composites are high-efficient electrocatalysts for glucose oxidation, and the nickel sites are the main catalytic active sites. However, it is worthy to be noted that the peak current density of Ni6(SC12H25)12 is only around 1 mA cm−2 for the electrochemical oxidation of glucose, which is much lower than that of Ni6/AB composites.
To reveal the intrinsic activity, linear sweep voltammetry (LSV) was adopted to further examine the activity of Ni6/AB composites towards glucose electrochemical oxidation. As shown in Fig. 3c, in comparison with the curve in 0.1 M KOH, the LSV polarization curve from the Ni6/AB composites displays a prominent oxidation current in 0.1 M KOH with the presence of 5 mM glucose. Detailed analysis shows that the onset oxidation potential locates at + 1.24 V, in consistence with result from CV and much lower than that from other reported materials. Meanwhile, at the peak potential of + 1.47 V, the maximum current density is determined to be 2.67 mA cm−2 and increases 22 times compared to that from primary LSV in 0.1 M KOH, which is higher than that from the previous reports, for example, Nafion/GOx/PCP1600/GCE electrode and nanoporous Au [42, 43]. This once again demonstrates the Ni6/AB composites are highly active catalysts for electrochemical glucose oxidation. Moreover, as shown by the LSV and CV curves in Fig. 3d and Additional file 1: Figure S6, gas atmosphere does not have much influence on the onset potential and current density of glucose oxidation on the present catalysts, suggesting that the present Ni6/AB composites will be a kind of potential high-efficient electrocatalyst for the compartment-less fuel cell.
As we know, stability is another important factor for evaluating the electrochemical performance of catalysts. In this work, chronoamperometry was first employed to investigate the durability of Ni6/AB composites. As shown in Additional file 1: Figure S7, during 5000-s test at the potential of + 1.46 V, the current density from i-t curve of Ni6/AB composites decreases slowly from initial 1.6 to 1.13 mA cm−2. This may be mainly caused by the decrease in concentration of glucose and can be explained by following CV and LSV tests. As shown in Fig. 4a, the onset potentials from the CV before and after 5000 s test almost unchanged, while the value of current density peak only declined from 4.78 to 4.19 mA cm−2, i.e, remained around 90%. Similarly, the LSV curves before and after i-t test also have not changed much in terms of onset potential and maximum current density. As shown in Fig. 4b, both curves exhibited onset potential of + 1.26 V and the maximum current density of 2.64 mA cm−2 at the same potential. Such CV and LSV results give illustrations that the present Ni6/AB composites can allow 4 the durability of at least 5000 s. In addition, the stability examination through cyclic voltammetry was also conducted. As shown in Fig. 4c, after 5000 cycles in the potential window from + 1.165 to 1.615 V, the electrochemical signals from nickel redox electric pair and glucose oxidation approximately disappeared due to the dissolution of catalysts or the loss of Ni(III). Meanwhile, as shown in Fig. 4d, the same is true of the situation in LSV curves after 5000 cycles, signifying that the durability of Ni6/AB composites cannot exceed 5000 cycles. Therefore, the present Ni6/AB composites have a good stability for the electrochemical oxidation of glucose and may be a potential choice for GFCs.
Herein, with regard of the good catalytic performance from Ni6/AB composites, we can speculate three possible reasons: (1) the high exposure of nickel metal atoms in Ni6(SC12H25)12. As above mentioned, the geometric structure of Ni6(SC12H25)12 is a.double-crown shape, so the whole nickel sites are exposed and stereospecific blockade can be ignored. This not only increases the catalytic active sites, but also enhances the availability of the sites; (2) the electron transfer between Ni6(SC12H25)12 and AB. As provided by XPS results, the more of high valence Ni(II) species in Ni6/AB composites may more easily transform into Ni(III) species, contributing to the electrochemical glucose oxidation, and (3) enhancement of conductivity and stability from AB support. It is well known that AB can usually improve the materials’ conductivity and its large surface can increase mass transport . Thus, the high activity from Ni6/AB composites not only benefits from the high exposure of nickel sites, but also is largely promoted by the AB supports.
Ni6/AB composites for electrochemical detection of glucose
On the basis of their high performance towards the oxidation of glucose, the extra application of Ni6/AB composites in glucose sensing was further investigated through amperometry. During i-t curve tests, + 1.46 V was used as the working potential. As shown in Fig. 5a, relative to the control curve in 0.1 M KOH, the current density of experimental i-t curve increases step by step with the successive addition of 0.125 mM glucose into the electrolyte, which is much more evident than that from the alone Ni6(SC12H25)12 and AB. This suggests the rapid-response ability and high sensitivity of Ni6/AB composites towards glucose. As shown in Fig. 5b, the further data fitting between current density and the concentration of glucose exhibits a satisfying linear curve, and the relation equation can be expressed as: J(y) = 0.7709 × C(x) + 0.054 (R2 = 0.997), where J and C refers to the recording current density and the glucose concentration, respectively. From the relation equation, the sensitivity of Ni6/AB composites can be identified as 0.7709 mA cm−2 mM−1. Based on the signal-to-noise ratio of 3, the limit of detection of the present composite materials sensing system for glucose is calculated to be 1.9 μM. Thus, in aspect of the sensitivity and the detection limit, the present sensing system is much superior to that from the previous reports, as shown in Additional file 1: Table S2. As a comparison, the linear equation from pure Ni6(SC12H25)12 can be written as: J(y) = 0.06 × C(x) + 0.023 (R2 = 0.964), while the sensitivity and the limit of detection is determined to be 0.06 mA cm−2 mM−1 and 25 μM, respectively.
It is well known that sodium chloride (NaCl), citric acid (CA), sucrose (Suc), and uric acid (UA) usually disturb the detection of glucose in human blood serum. In this work, to investigate the selectivity of Ni6/AB composites, glucose (0.15 mM), NaCl (0.15 mM), CA (0.15 mM), Suc (0.025 mM), and UA (0.025 mM) were alternately introduced into the electrolyte of 0.1 M KOH. As shown in Fig. 6, other four analytes did not produce observable current signals under the same condition, and the succedent reponsing current of glucose was also not affected by these disturbing substances. Meanwhile, it is more worthy to be noted that the healthy physiological concentration of glucose is much higher than that from above mentioned interfences in human body . Therefore, these results indicate the high selectivity of Ni6/AB composites towards glucose sensing and its potential practical application in glucose sensors.
In this work, Ni6/AB composites consisting of atomically precise Ni6(SC12H25)12 and acetylene black were investigated as catalysts for the electrochemical oxidation of glucose. The results from cyclic voltammetric and linear sweep voltammetric curves demonstrated the high-efficient performance of Ni6/AB composites for glucose oxidation. Combining electrochemical data with XPS results, the high catalytic activity of present composites can be attributed to the high-exposed nickel active sites and increased mass/electron transportation. In addition, based on the high electrochemical activity, the obtained Ni6/AB composites can also realize the sensitivity and selectivity detection of glucose. We hope this work could not only lay a foundation for the application of atomically precise catalysts in GFCs and glucose sensors, but also promote the development of nickel-based catalysts in other fields such as disease diagnosis, microbiological fuel cell, and gas sensing.
Availability of data and materials
The data and conclusions in this work are all showed in this paper.
Glucose fuel cell
Linear sweep voltammetry
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We thank Aimin Guo for his discussion in this study.
We acknowledge the financial support of NFSC grants 21902186, starting 534 funding of Central South University grants 202045005 and Support by the Open Sharing Fund for the Large-scale Instruments and Equipments of Central South University.
The authors declare that they have no competing interests.
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
The objective spherical aberration correction field emission transmission electron microscopy from parent nickel catalyst, Ni6(SC12H25)12. The scale bar is 10 nm. Figure S2. The experimental and simulated patterns for the fragments from parent nickel catalyst, Ni6(SC12H25)12. Figure S3. The XPS survey spectrum of pure acetylene black. Figure S4. (a) The deconvulted C 1s XPS spectrum from AB; (b) The deconvulted O 1s XPS spectrum from AB; (c) The deconvulted S 2p XPS spectrum from AB; (a) The deconvulted Ni 2p XPS spectrum from AB. Figure S5. Cyclic voltametric curves of AB (left) and Ni6(SC12H25)12 (right) in 0.1 M KOH with the presence of 5 mM glucose with the scan rate of 50 mV/s. Figure S6. Cyclic voltametric curves of the Ni6/AB composites in 0.1 M KOH with the presence of 5 mM glucose under Ar or O2 atomsphere with the scan rate of 50 mV/s. Figure S7. The current density-time curve of the Ni6/AB composites in 0.1 M KOH with the presence of 5 mM glucose during 5000s i-t test. Table S1. Comparison of the Ni6/AB composites with the previously reported electrocatalysts for glucose oxidation. Table S2. Comparison of the Ni6/AB composites with the previously reported material for glucose sensing
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Gao, X., Feng, W., Xu, Y. et al. Nickel Catalysts Supported on Acetylene Black for High-Efficient Electrochemical Oxidation and Sensitive Detection of Glucose. Nanoscale Res Lett 15, 23 (2020). https://doi.org/10.1186/s11671-019-3218-1
- Nickel catalyst
- Glucose oxidation
- Glucose detection