24August2019

Nano-Micro Letters

Charge Engineering of Mo2C@defect-rich N-doped Carbon Nanosheets for Efficient Electrocatalytic H2 Evolution

Chunsheng Lei1, 2, Wen Zhou1, 2, Qingguo Feng3, Yongpeng Lei1, 4, *, Yi Zhang4, Yin Chen4, Jiaqian Qin5

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Nano-Micro Lett. (2019) 11: 45

First Online: 1 June 2019 (Article)

DOI:10.1007/s40820-019-0279-8

*Corresponding author. E-mail: lypkd@163.com (Y. Lei)

 

Abstract

 


Toc

Charge engineering of carbon materials with many defects shows great potential in electrocatalysis, and molybdenum carbide (Mo2C) is one of the noble-metal-free electrocatalysts with the most potential. Herein, we study the Mo2C on pyridinic nitrogen-doped defective carbon sheets (MoNCs) as catalysts for the hydrogen evolution reaction (HER). Theoretical calculations imply that the introduction of Mo2C produces a graphene wave structure, which in some senses behaves like N-doping to form localized charges. Being an active electrocatalyst, MoNCs demonstrate a Tafel slope as low as 60.6 mV dec-1 and high durability of up to 10 h in acidic media. Besides charge engineering, plentiful defects and hierarchical morphology also contribute to good performance. This work underlines the importance of charge engineering to boost catalytic performance. 


 

Keywords

Molybdenum carbide; Nitrogen-doped carbon nanosheets; Charge engineering; Graphene wave; Hydrogen evolution reaction

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