Two-dimensional metallic CoTe2 flakes for electrocatalytic hydrogen evolution

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外文摘要：Two-dimensional(2D)metallic 1T-CoTe2 has attracted considerable attention due to its fascinating physical properties and promising applications in elec-tronics and catalysis.However,the production of high-quality 2D 1T-CoTe2 still remains challenging.Herein,we demonstrate a methodology to realize the facile synthesis of ultrathin,high-quality CoTe2 flakes with a thickness down to 2.3 nm on mica substrates by an ambient-pressure chemical vapor deposition(CVD)technique.The atomic arrangement is verified by scanning transmission electron microscopy.The theoretical calculations uncover the metallic characteristic of 1T-CoTe2 in the 2D limit.Remarkably,the CVD-derived 2D metallic CoTe2 flakes for the hydrogen evolution reaction(HER)catalyst exhibit admirable performance,such as an overpotential of 186 mV at 10 mA.cm-2,aTafel slope of 78 mV·dec-1,an exchange current density of 69 μA.cm-2,and negligible performance degradation after 1000 cycles.These results establish novel approaches for the synthesis and HER application of 2D metallic 1T-CoTe2.

外文关键词：

2D metallic material1T-CoTe2Chemical vapor depositionElectrochemical hydrogen evolution

作者：

Yu-Qing Zhao、Qian Liu、Bo-Jian Zhou、Guang Yang、Shao-Long Jiang

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作者单位：

School of Physics and Electronics Science,Hunan University of Science and Technology,Xiangtan 411201,China

College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,China

Department of Physics,Southern University of Science and Technology,Shenzhen 518055,China

School of Integrated Circuit Science and Engineering,Beihang University,Beijing 100191,China

Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area(Guangdong),Shenzhen 518045,China

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出版年：

2024

DOI：

10.1007/s12598-024-02790-x

稀有金属(英文版)

中国有色金属学会

稀有金属(英文版)

CSTPCDEI

影响因子：0.801

ISSN：1001-0521

年,卷(期)：2024.43(11)