4.7 Article

Hexagonal CoSe2 nanosheets stabilized by nitrogen-doped reduced graphene oxide for efficient hydrogen evolution reaction

Journal

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 45, Issue 3, Pages 1738-1747

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2019.11.059

Keywords

Hexagonal CoSe2; Nitrogen-doped graphene; Hydrogen evolution reaction; Electrical and chemical coupling

Funding

  1. Danish National Research Foundation
  2. AUFF-NOVA project from Aarhus Universitets Forskningsfond
  3. EU H2020RISE 2016-MNR4S Cell project
  4. National Program for Support of Top-notch Young Professionals, National Natural Science Foundation of China [51773049]
  5. National Program for Support of Topnotch Young Professionals -Harbin Institute of Technology Joint Center for Technology Innovation Fund [HIT15-1A01]
  6. Shanghai Academy of Spaceflight Technology Fund [SAST2017-126]
  7. Harbin city science and technology projects [2013DB4BP031, RC2014QN017035]
  8. China Postdoctoral Science Special Foundation [201003420, 20090460067]
  9. HIT Research Institute (Zhao Yuan) of New Materials and Intelligent Equipment Technology Co., Ltd. Scientific and Technological Cooperation and Development Fund [2017KJHZ002]
  10. Fundamental Research Funds for the Central Universities, China [YJ201893]
  11. State Key Lab of Advanced Metals and Materials, China [2019-Z03]

Ask authors/readers for more resources

CoSe2 is considered as a promising candidate among non-noble metal electrocatalysts for the hydrogen evolution reaction (HER) due to its intrinsic metallicity and low Gibbs free energy for hydrogen adsorption. Recently, the hexagonal CoSe2 becoming increasingly popular owing to its chemically favorable basal plane, which provides more active sites, but remains limited by the poor stability. In this study, we design a small-molecule-amine assisted hydrothermal method to in situ anchor the hexagonal CoSe2 nanosheets (NSs) on nitrogen-doped reduced graphene oxides (RGO) as an advanced electrode material for HER. Due to the existence of abundant functional groups and high specific surface area of RGO, the hexagonal CoSe2 NSs could be stably formed on RGO. As a result, only a small over potential of 172 mV is needed for the optimized sample to drive a current density of 10 mA cm(-2) in 0.5 M H2SO4 and the Tafel slope is 35.2 mV dec(-1), which is comparable with the state-of-the-art Pt catalyst (32.3 mV dec(-1)). Therefore, the facile and low-cost method for synthesizing hexagonal TMDs with robust electrical and chemical coupling developed in this work is promising in promoting the large-scale application of non-precious electrocatalysts. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

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