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Hollow carbon nanospheres@graphitic C3N5 heterostructures for enhanced oxygen electroreduction by Qi Li; Shizhu Song; Zhiyong Mo; Lifang Zhang; Yijun Qian; Cunwang Ge is a Materials Science article available to read on EtoBox.

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Improving the electrocatalytic activity of metal-free catalysts for the oxygen reduction reaction (ORR) is of great significance as promising alternatives to the Pt group precious catalysts in fuel cells. This paper proposes a simple template-based strategy to fabricate a catalyst with enhanced ORR activity. The resulting material contained 3D heterojunction and consisted of hollow carbon nanospheres and graphitic C 3 N 5 (HCNs@g-C 3 N 5 ). The fast electron/charge transports between g-C 3 N 5 and HCNs was achieved because of the conductive heterojunction presence. This heterojunction provided the potential difference, which is beneficial for O 2 activation and desorption of the intermediate reaction products. Compared with stand-alone HCNs and g-C 3 N 5 , the HCNs@g-C 3 N 5 composite demonstrated significantly enhanced ORR activity with a more positive half-wave potential and faster kinetics in the alkaline medium. Furthermore, linear sweep voltammetry demonstrated that the water generation from O 2 occurred through a four-electron transfer reaction. According to calculations performed using density functional theory (DFT), a built-in electronic field (IEF) formed at the heterojun

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Author

Qi Li; Shizhu Song; Zhiyong Mo; Lifang Zhang; Yijun Qian; Cunwang Ge

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Materials Science (Physical Sciences)