Boosting alkaline hydrogen evolution: the dominating role of interior modification in surface electrocatalysis,Energy & Environmental Science

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Boosting alkaline hydrogen evolution: the dominating role of interior modification in surface electrocatalysis
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020-07-31 , DOI: 10.1039/d0ee01750g
Zhao Li _{1,

2,

3,

4,

5} , Wenhan Niu _{2,

3,

4,

5} , Zhenzhong Yang _{4,

6,

7,

8} , Abdelkader Kara _{2,

3,

4,

9,

10} , Qi Wang _{11,

12,

13} , Maoyu Wang _{4,

14,

15,

16} , Meng Gu _{11,

12,

13} , Zhenxing Feng _{4,

14,

15,

16} , Yingge Du _{4,

6,

7,

8} , Yang Yang _{1,

2,

3,

4,

5}

Affiliation

Department of Materials Science and Engineering
University of Central Florida
Orlando
USA
NanoScience Technology Center
Physical and Computational Sciences Directorate
Pacific Northwest National Laboratory
Richland
Department of Physics, University of Central Florida
Energy Conversion and Propulsion Cluster
Department of Materials Science and Engineering, Southern University of Science and Technology
Shenzhen 518055
China
School of Chemical, Biological, and Environmental Engineering
Oregon State University
Corvallis

The alkaline hydrogen evolution reaction (A-HER) holds great promise for clean hydrogen fuel generation but its practical utilization is severely hindered by the sluggish kinetics for water dissociation in alkaline solutions. Traditional ways to improve the electrochemical kinetics for A-HER catalysts have been focusing on surface modification, which still can not meet the demanding requirements for practical water electrolysis because of catalyst surface deactivation. Herein, we report an interior modification strategy to significantly boost the A-HER performance. Specifically, a trace amount of Pt was doped in the interior Co₂P (Pt–Co₂P) to introduce a stronger dopant–host interaction than that of the surface-modified catalyst. Consequently, the local chemical state and electronic structure of the catalysts were adjusted to improve the electron mobility and reduce the energy barriers for hydrogen adsorption and H–H bond formation. As a proof-of-concept, the interior-modified Pt–Co₂P shows a reduced onset potential at near-zero volts for the A-HER, low overpotentials of 2 mV and 58 mV to achieve 10 and 100 mA cm⁻², and excellent durability for long-term utilization. The interior-modified Pt–Co₂P delivers superior A-HER performance to Pt/C and other state-of-the-art electrocatalysts. This work will open a new avenue for A-HER catalyst design.

中文翻译：

促进碱性氢的释放：内部修饰在表面电催化中的主导作用

碱性氢放出反应（A-HER）对于产生干净的氢燃料具有广阔的前景，但由于碱性溶液中水的分解速度缓慢，其实际使用受到严重阻碍。改善A-HER催化剂电化学动力学的传统方法一直侧重于表面改性，由于催化剂表面失活，该方法仍不能满足实际水电解的苛刻要求。在此，我们报告了一种内部改型策略，以显着提高A-HER性能。具体来说，在室内Co ₂ P（Pt–Co ₂P）引入比表面改性催化剂更强的掺杂剂－主体相互作用。因此，调节了催化剂的局部化学状态和电子结构，以提高电子迁移率并减少氢吸附和H–H键形成的能垒。作为概念验证，内部修饰的Pt–Co ₂ P在A-HER的接近零伏电压下显示出降低的启动电势，2 mV和58 mV的低过电势可实现10和100 mA cm ^-2，以及出色的耐用性，可长期使用。经过内部修饰的Pt–Co ₂ P具有优于Pt / C和其他最先进电催化剂的A-HER性能。这项工作将为A-HER催化剂设计开辟新的途径。

更新日期：2020-09-16

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