Citation: Qian Zhou, Qihang Bian, Liling Liao, Fang Yu, Dongyang Li, Dongsheng Tang, Haiqing Zhou. In situ electrochemical dehydrogenation of ultrathin Co(OH)₂ nanosheets for enhanced hydrogen evolution[J]. Chinese Chemical Letters, ;2023, 34(1): 107248. doi: 10.1016/j.cclet.2022.02.053 shu

In situ electrochemical dehydrogenation of ultrathin Co(OH)₂ nanosheets for enhanced hydrogen evolution

Qian Zhou ^a ,
Qihang Bian ^a ,
Liling Liao ^a ,
Fang Yu ^{a, *,} ,
Dongyang Li ^a ,
Dongsheng Tang ^{a, *,} ,
Haiqing Zhou ^{a, b, *,}

a.
Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Key Laboratory for Matter Microstructure and Function of Hunan Province, Hunan Normal University, Changsha 410081, China
b.
Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy, Hunan University, Changsha 410082, China

fyu@hunnu.edu.cn

dstang@hunnu.edu.cn

hqzhou@hunnu.edu.cn

Received Date: 3 January 2022
Revised Date: 23 January 2022
Accepted Date: 17 February 2022
Available Online: 22 February 2022

Figures(4)

Transition metal hydroxides/oxyhydroxides have recently emerged as highly active electrocatalysts for oxygen evolution reaction in alkaline water electrolysis, while have not yet been widely investigated for hydrogen evolution electrocatalysts owing to their unfavorable H*-adsorption, making it difficult to construct an overall-water-splitting cell for hydrogen production. In this work, we proposed a straightforward and effective approach to develop an efficient in-plane heterostructured CoOOH/Co(OH)₂ catalyst via In-situ electrochemical dehydrogenation method, in which the dehydrogenated –CoOOH and Co(OH)₂ at the surface synergistically boost the hydrogen evolution reaction (HER) kinetics in base as confirmed by high-resolution transmission electron microscope, synchrotron X-ray absorption spectroscopy, and electron energy loss spectroscopy. Due to the In-situ dehydrogenation of ultrathin Co(OH)₂ nanosheets, the catalytic activity of the CoOOH/Co(OH)₂ heterostructures is progressively improved, which exhibit outstanding hydrogen-evolving activity in base requiring a low overpotential of 132 mV to afford 10 mA/cm² with very fast reaction kinetics after 60 h dehydrogenation. The gradually improved catalytic performance for the CoOOH/Co(OH)₂ is probably due to the enhanced H*-adsorption induced by the synergistic effect of heterostructures and better conductivity of CoOOH relative to electrically insulating Co(OH)₂. This work will open the opportunity for a new family of transition metal hydroxides/oxyhydroxides as active HER catalysts, and also highlight the importance of using in situ techniques to construct precious metal-free efficient catalysts for alkaline hydrogen evolution.
- Hydrogen evolution reaction,
- Transition metal hydroxide,
- In-situ electrochemical dehydrogenation,
- In-plane heterostructure,
- Water splitting
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In situ electrochemical dehydrogenation of ultrathin Co(OH)2 nanosheets for enhanced hydrogen evolution

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In situ electrochemical dehydrogenation of ultrathin Co(OH)₂ nanosheets for enhanced hydrogen evolution