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Surface Tuning to Promote the Electrocatalysis for Oxygen Evolution Reaction: From Metal-Free to Cobalt-Based Carbon Electrocatalysts by Yanan Wang; Shuguang Zhang; Xiuxia Meng; Ting Wang; Yu Feng; Weimin Zhang; Yu-Shi He; Yucheng Huang; Naitao Yang; Zi-Feng Ma is a Engineering article available to read on EtoBox.

What is Surface Tuning to Promote the Electrocatalysis for Oxygen Evolution Reaction: From Metal-Free to Cobalt-Based Carbon Electrocatalysts about?

Heterogeneous electrocatalytic reactions only occur at the interface between the electrocatalyst and reactant. Therefore, the active sites are only necessary to be distributed on the surface of the electrocatalyst. Based on this motivation, here, we demonstrate a systematic study on surface tuning for a carbon-based electrocatalyst from metal-free (with the heteroatoms N and S, NS/C) to metal-containing surfaces (with Co, N, and S, CoNS/C). The CoNS/C electrocatalyst was obtained by pyrolyzing the Co precoordinated and -toluenesulfonate-doped polypyrrole (PPy). It was found that the coordination of Co on the PPy ring tuned the final carbon electrocatalyst into a catalyst with a CoN moiety-rich surface. In addition, the as-synthesized CoNS/C was determined to have a very high loading of cobalt up to 2.02 wt %. The pyrolysis of the cobalt-containing precursor tends to proceed toward a characteristic of a higher sp carbon content, a higher surface area, and more nitrogen as well as active nitrogen sites than its metal-free counterpart. The most distinguished feature for such a catalyst is that the truly most active component is only distributed on the surface, in contrast with that of

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Author

Yanan Wang; Shuguang Zhang; Xiuxia Meng; Ting Wang; Yu Feng; Weimin Zhang; Yu-Shi He; Yucheng Huang; Naitao Yang; Zi-Feng Ma

Publisher

American Chemical Society (ACS)

Published

2020

Language

EN

Field

Engineering (Physical Sciences)