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首页> 外文期刊>Advanced energy materials >Enhanced Electrocatalysis for Energy-Efficient Hydrogen Production over CoP Catalyst with Nonelectroactive Zn as a Promoter
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Enhanced Electrocatalysis for Energy-Efficient Hydrogen Production over CoP Catalyst with Nonelectroactive Zn as a Promoter

机译：以非电活性锌为促进剂的CoP催化剂上的增强电催化制氢效率

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摘要

As a non-toxic species, Zn fulfills a multitude of biological roles, but its promoting effect on electrocatalysis has been rarely explored. Herein, the theoretic predications and experimental investigations that non-electroactive Zn behaves as an effective promoter for CoP-catalyzed hydrogen evolution reaction (HER) in both acidic and alkaline media is reported. Density function theory calculations reveal that Zn doing leads to more thermal-neutral hydrogen adsorption free energy and thus enhanced HER activity for CoP catalyst. Electrochemical tests show that a Zn0.08Co0.92P nanowall array on titanium mesh (Zn0.08Co0.92P/TM) needs overpotentials of only 39 and 67 mV to drive a geometrical catalytic current of 10 mA cm(-2) in 0.5 m H2SO4 and 1.0 m KOH, respectively. This Zn0.08Co0.92P/TM is also superior in activity over CoP/TM for urea oxidation reaction (UOR), driving 115 mA cm(-2) at 0.6 V in 1.0 m KOH with 0.5 m urea. The high HER and UOR activity of this bifunctional electrode enables a Zn0.08Co0.92P/TM-based two-electrode electrolyzer for energy-saving hydrogen production, offering 10 mA cm(-2) at a low voltage of 1.38 V with strong long-term electrochemical stability.
机译：锌作为一种无毒物种，具有多种生物学作用，但是对电催化的促进作用却很少被探索。在本文中，报道了在酸性和碱性介质中非电活性锌在CoP催化的氢释放反应（HER）中起有效促进剂作用的理论预测和实验研究。密度泛函理论计算表明，锌的作用导致更多的热中性氢吸附自由能，从而增强了CoP催化剂的HER活性。电化学测试表明，钛网上的Zn0.08Co0.92P纳米壁阵列（Zn0.08Co0.92P / TM）仅需要39和67 mV的超电势即可在0.5 m H2SO4中驱动10 mA cm（-2）的几何催化电流和1.0 m KOH分别。该Zn0.08Co0.92P / TM在尿素氧化反应（UOR）方面也优于CoP / TM，在0.5 m尿素中于1.0 m KOH中以0.6 V驱动115 mA cm（-2）。这种双功能电极的高HER和UOR活性使基于Zn0.08Co0.92P / TM的两电极电解槽可用于节能的氢气生产，可在1.38 V的低压下提供10 mA cm（-2）的长寿命电化学稳定性。

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  • 来源
    《Advanced energy materials》 |2017年第15期|1700020.1-1700020.8|共8页
  • 作者

    Liu Tingting; Liu Danni; Qu Fengli; Wang Dengxing; Zhang Ling; Ge Ruixiang; Hao Shuai; Ma Yongjun; Du Gu; Asiri Abdullah M.; Chen Liang; Sun Xuping;

  • 作者单位

    Sichuan Univ, Coll Chem, Chengdu 610064, Sichuan, Peoples R China;

    Sichuan Univ, Coll Chem, Chengdu 610064, Sichuan, Peoples R China;

    Qufu Normal Univ, Coll Chem & Chem Engn, Qufu 273165, Shandong, Peoples R China;

    Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China;

    Sichuan Univ, Coll Chem, Chengdu 610064, Sichuan, Peoples R China;

    Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China;

    Sichuan Univ, Coll Chem, Chengdu 610064, Sichuan, Peoples R China;

    Southwest Univ Sci & Technol, Analyt & Test Ctr, Mianyang 621010, Sichuan, Peoples R China;

    Chengdu Inst Geol & Mineral Resources, Chengdu 610081, Sichuan, Peoples R China;

    King Abdulaziz Univ, Chem Dept, Jeddah 21589, Saudi Arabia;

    Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China;

    Sichuan Univ, Coll Chem, Chengdu 610064, Sichuan, Peoples R China;

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