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Fig. 2 | Nanoscale Research Letters

Fig. 2

From: Progress of carbon-based electrocatalysts for flexible zinc-air batteries in the past 5 years: recent strategies for design, synthesis and performance optimization

Fig. 2

a Schematic of the preparation process for MPZ-CC@CNT [28]. b Synthesis of the Co/Co–N-C catalyst [29]. c Schematic of the preparation of the Fe3O4@PCN catalysts [40]. d Scheme depicting the Co3O4/N-p-MCNTs composite catalyst synthesis [41]. e Scheme of the fabrication procedure for the MH paper air cathode, along with its photograph [43]. f Schematic representation of the fabrication procedure for the NCNF and photographs of the resultant flexible NCNF [44]

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