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Nickel–Cobalt Diselenide 3D Mesoporous Nanosheet Networks Supported on Ni Foam: An All-pH Highly Efficient Integrated Electrocatalyst for Hydrogen Evolution

Authors :
Liu, Bin
Zhao, Yu-Fei
Peng, Huiqing
Zhang, Zhen-Yu
Sit, Chun-Kit
Yuen, Muk-Fung
Zhang, Tie-Rui
Lee, Chun-Sing
Zhang, Wen-Jun
Liu, Bin
Zhao, Yu-Fei
Peng, Huiqing
Zhang, Zhen-Yu
Sit, Chun-Kit
Yuen, Muk-Fung
Zhang, Tie-Rui
Lee, Chun-Sing
Zhang, Wen-Jun
Publication Year :
2017

Abstract

Novel 3D Ni1−xCoxSe2 mesoporous nanosheet networks with tunable stoichiometry are successfully synthesized on Ni foam (Ni1−xCoxSe2 MNSN/NF with x ranging from 0 to 0.35). The collective effects of special morphological design and electronic structure engineering enable the integrated electrocatalyst to have very high activity for hydrogen evolution reaction (HER) and excellent stability in a wide pH range. Ni0.89Co0.11Se2 MNSN/NF is revealed to exhibit an overpotential (η10) of 85 mV at −10 mA cm−2 in alkaline medium (pH 14) and η10 of 52 mV in acidic solution (pH 0), which are the best among all selenide-based electrocatalysts reported thus far. In particular, it is shown for the first time that the catalyst can work efficiently in neutral solution (pH 7) with a record η10 of 82 mV for all noble metal-free electrocatalysts ever reported. Based on theoretical calculations, it is further verified that the advanced all-pH HER activity of Ni0.89Co0.11Se2 is originated from the enhanced adsorption of both H+ and H2O induced by the substitutional doping of cobalt at an optimal level. It is believed that the present work provides a valuable route for the design and synthesis of inexpensive and efficient all-pH HER electrocatalysts. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Details

Database :
OAIster
Notes :
English
Publication Type :
Electronic Resource
Accession number :
edsoai.on1032799760
Document Type :
Electronic Resource