Charge Engineering of Mo 2 C@Defect-Rich N-Doped Carbon Nanosheets for Efficient Electrocatalytic H 2 Evolution
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ARTICLE
Cite as Nano-Micro Lett. (2019) 11:45 Received: 26 March 2019 Accepted: 15 May 2019 © The Author(s) 2019
https://doi.org/10.1007/s40820-019-0279-8
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 Chunsheng Lei, Wen Zhou, and Qingguo Feng contributed equally to this work. * Yongpeng Lei, [email protected] State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, People’s Republic of China
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College of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, People’s Republic of China Key Laboratory of Advanced Technologies of Materials, Ministry of Education, and Institute of Materials Dynamics, Southwest Jiaotong University, Chengdu 610031, Sichuan, People’s Republic of China Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, People’s Republic of China Metallurgy and Materials Science Research Institute, Chulalongkorn University, Bangkok 10330, Thailand
HIGHLIGHTS • The Mo2C modified carbon nanosheets produce a graphene wave structure to form localized charges and further enhance the N-doping effect. • The optimal sample shows a Tafel slope as low as 60.6 mV dec−1 and high durability up to 10 h in acidic media.
ABSTRACT Charge engineering of carbon materials with many defects shows great potential in electrocatalysis, and molybdenum
carbide ( Mo 2C) 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. 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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Nano-Micro Lett.
1 Introduction
2 Experimental Section
With the intensification of global energy consumption and severe environmental deterioration, sustainable and environmentally friendly approaches have aroused increasing interest [1]. Among ongoing attempts to produce clean fuels, the electrolysis of water to produce H 2 is attractive [2–6]. The key to this problem is to seek an effective electrocatalyst to minimize the overpotential for hydrogen evolution reaction (HER). To replace Pt-based noble metals, abundant earth catalysts have received
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