A CoMoO4–Co2Mo3O8 heterostructure with valence-rich molybdenum for a high-performance hydrogen evolution reaction in alkaline solution†,Journal of Materials Chemistry A

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A CoMoO4–Co2Mo3O8 heterostructure with valence-rich molybdenum for a high-performance hydrogen evolution reaction in alkaline solution†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2019-06-21 00:00:00 , DOI: 10.1039/c9ta04180j
Zheng Liu _{1,

2,

3,

4,

5} , Changhong Zhan _{1,

2,

3,

4,

5} , Linkai Peng _{1,

2,

3,

4,

5} , Yang Cao _{1,

2,

3,

4,

5} , Yong Chen _{1,

2,

3,

4,

5} , Shujiang Ding _{5,

6,

7,

8,

9} , Chunhui Xiao _{5,

6,

7,

8,

9} , Xiaoyong Lai _{5,

10,

11,

12,

13} , Jianwei Li _{5,

14,

15,

16} , Songrui Wei _{5,

14,

15,

16} , Jieqiong Wang _{1,

2,

3,

4,

5} , Jinchun Tu _{1,

2,

3,

4,

5}

Affiliation

State Key Laboratory of Marine Resource Utilization in South China Sea
School of Materials Science and Engineering
Hainan University
Haikou 570228
P. R. China
Department of Applied Chemistry
School of Science
Xi'an Jiaotong University
Xi'an 710049
State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering
College of Chemistry and Chemical Engineering
Ningxia University
Yinchuan 750021
College of Physics and Optoelectronic Engineering
Shenzhen University
Shenzhen

The hydrogen evolution reaction (HER) is a promising clean and renewable energy source. Thus, efficient and inexpensive electrocatalysts for the HER have attracted considerable attention. Here, we report a two-step method for the synthesis of a unique CoMoO₄–Co₂Mo₃O₈ heterostructure. The CoMoO₄–Co₂Mo₃O₈ heterostructure exhibited superior HER activity that included a low overpotential of 57 mV, a Tafel slope of 55 mV dec⁻¹ in a 1 M KOH solution, and excellent long-term stability given its high intrinsic activity and superior conductivity. Density functional theory calculations indicated that CoMoO₄ and Co₂Mo₃O₈ synergistically optimized electron distribution to reduce hydrogen adsorption energy and significantly enhance electrocatalytic activity. Our work may provide novel ideas for improving the HER performance of valence-rich transition element oxides.

中文翻译：

CoMoO ₄ -Co ₂ Mo ₃ O ₈异质结构与富化价钼在碱性溶液中的高效产氢反应†

析氢反应（HER）是一种有前途的清洁和可再生能源。因此，用于HER的有效和廉价的电催化剂已引起相当大的关注。在这里，我们报告了一种用于合成独特的CoMoO ₄ -Co ₂ Mo ₃ O ₈异质结构的两步法。CoMoO ₄ -Co ₂ Mo ₃ O ₈异质结构表现出优异的HER活性，包括在1 M KOH溶液中的低过电势（57 mV），Tafel斜率（55 TaVel dec ^-1）以及出色的长期稳定性（由于其固有的高内在性）活性和优异的导电性。密度泛函理论计算表明，CoMoO₄和Co₂ Mo₃ O₈协同优化电子分布，以减少氢吸附能并显着增强电催化活性。我们的工作可能会提供新颖的想法，以改善富含价态的过渡元素氧化物的HER性能。

更新日期：2019-06-21

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