Fig. 5
The electrochemical study in aqueous 0.5 M H2SO4 + 0.5 M HCOOH. a The cyclic voltammetric study in 0.5 M aqueous H2SO4. The inset is the same electrical chemical study for Au nanoparticles. b The HCOOH oxidation test for three electrocatalysts in 0.0–1.0 V range. The numbers are the area ratios with respect to the dash baselines. The inset is the test for Au/PDDA and Au, respectively