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The development of earth-abundant-metal-based electrocatalysts with high efficiency and long-term stability for hydrogen evolution reaction (HER) is crucial for the clean and renewable energy application. Herein, we report a molten-salt method to synthesize Co-doped CaMn3O6 (CMO) nanowires (NWs) as effective electrocatalyst for HER. The as-obtained CaMn3−xCoxO6 (CMCO) exhibits a small onset overpotential of 70 mV, a required overpotential of 140 mV at a current density of 10 mA·cm−2, a Tafel slope of 39 mV·dec−1 in 0.1 M HClO4, and a satisfying long-term stability. Experimental characterizations combined with density functional theory (DFT) calculations demonstrate that the obtained HER performance can be attributed to the Co-doping which altered CMO’s surface electronic structures and properties. Considering the simplicity of synthesis route and the abundance of the pertinent elements, the synthesized CMCO shows a promising prospect as a candidate for the development of earth-abundant, metal-based, and cost-effective electrocatalyst with superior HER activity. Our results also establish a strategy of rational design and construction of novel electrocatalyst toward HER by tailoring band structures of transition metal oxides (TMOs).


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Cobalt doping boosted electrocatalytic activity of CaMn3O6 for hydrogen evolution reaction

Show Author's information Qun Li1,§Kaisi Liu1,§Siwei Gui3Jiabin Wu1Xiaogang Li3Zaifang Li2( )Hongrun Jin1Hui Yang3( )Zhimi Hu1Wenxi Liang1( )Liang Huang1( )
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
China-Australia Institute for Advanced Materials and Manufacturing, Jiaxing University, Jiaxing 314001, China
State Key Laboratory of Material Processing and Die & Mold Technology, Department of Mechanics, School of Aerospace Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

§ Qun Li and Kaisi Liu contributed equally to this work.

Abstract

The development of earth-abundant-metal-based electrocatalysts with high efficiency and long-term stability for hydrogen evolution reaction (HER) is crucial for the clean and renewable energy application. Herein, we report a molten-salt method to synthesize Co-doped CaMn3O6 (CMO) nanowires (NWs) as effective electrocatalyst for HER. The as-obtained CaMn3−xCoxO6 (CMCO) exhibits a small onset overpotential of 70 mV, a required overpotential of 140 mV at a current density of 10 mA·cm−2, a Tafel slope of 39 mV·dec−1 in 0.1 M HClO4, and a satisfying long-term stability. Experimental characterizations combined with density functional theory (DFT) calculations demonstrate that the obtained HER performance can be attributed to the Co-doping which altered CMO’s surface electronic structures and properties. Considering the simplicity of synthesis route and the abundance of the pertinent elements, the synthesized CMCO shows a promising prospect as a candidate for the development of earth-abundant, metal-based, and cost-effective electrocatalyst with superior HER activity. Our results also establish a strategy of rational design and construction of novel electrocatalyst toward HER by tailoring band structures of transition metal oxides (TMOs).

Keywords: electronic structure, hydrogen evolution reaction, dopant, CMCO nanowires

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Publication history

Received: 01 July 2021
Revised: 06 September 2021
Accepted: 09 September 2021
Published: 20 October 2021
Issue date: April 2022

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© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021
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