How does carbon surface charge promotes oxygen reduction reaction?
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The surface charge distribution of carbon-based electrocatalysts plays a crucial role in promoting the oxygen reduction reaction (ORR) . Strategies such as N, S co-doping and introducing sp3-hybridized carbon defects have been found to enhance the ORR activity . N, S co-doping increases the positive charge of surface carbon atoms, resulting in improved ORR performance . The introduction of sp3-hybridized carbon defects through vaporized salt modification also enhances the ORR activity by forming efficient sp2/sp3 hybridized carbon sites . Additionally, the presence of quinone and carboxy groups on amorphous carbon surfaces increases the rate of ORR and promotes electrochemical peroxide reduction . Nitrogen doping of carbon retards the disproportionation of superoxide, thereby enhancing the ORR . Overall, regulating the surface charge distribution of carbon-based materials is a promising approach to achieve active and stable ORR electrocatalysts.
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