催化学报 ›› 2022, Vol. 43 ›› Issue (8): 2091-2110.DOI: 10.1016/S1872-2067(21)64052-4

• 综述 • 上一篇    下一篇

异质原子在碱性电解水催化剂中的作用——反应机理

黄楚强a,, 周建清c,, 段丁槊a, 周前程a, 汪杰明a, 彭博文a, 余罗b,*(), 余颖a,#()   

  1. a华中师范大学物理科学与技术学院纳米科技研究所, 湖北武汉430079
    b香港中文大学化学系, 香港沙田999077
    c湖北师范大学先进材料研究院, 湖北黄石435002
  • 收稿日期:2021-12-30 接受日期:2022-02-28 出版日期:2022-08-18 发布日期:2022-06-20
  • 通讯作者: 余罗,余颖
  • 作者简介:第一联系人:

    共同第一作者.

  • 基金资助:
    国家自然科学基金资助项目(U20A20246);国家自然科学基金资助项目(51872108);中央高校基本科研业务费专项资金资助项目(CCNU20TS006)

Roles of heteroatoms in electrocatalysts for alkaline water splitting: A review focusing on the reaction mechanism

Chuqiang Huanga,, Jianqing Zhouc,, Dingshuo Duana, Qiancheng Zhoua, Jieming Wanga, Bowen Penga, Luo Yub,*(), Ying Yua,#()   

  1. aInstitute of Nanoscience and Nanotechnology, College of Physical Science and Technology, Central China Normal University, Wuhan 430079, Hubei, China
    bDepartment of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong 999077, China
    cInstitute for Advanced Materials, Hubei Normal University, Huangshi 435002, Hubei, China
  • Received:2021-12-30 Accepted:2022-02-28 Online:2022-08-18 Published:2022-06-20
  • Contact: Luo Yu, Ying Yu
  • About author:First author contact:

    Contributed equally to this work.

  • Supported by:
    National Natural Science Foundation of China(U20A20246);National Natural Science Foundation of China(51872108);Fundamental Research Funds for the Central Universities(CCNU20TS006)

摘要:

构建低碳绿色能源体系是全世界追求的目标. 氢气具有能量密度高、零碳排放的优势, 是理想的清洁能源. 目前市场上95%以上的氢气来自于与化石燃料相关的工艺, 如煤气化、甲烷蒸汽重整等方法, 在制氢过程中不可避免地会排放大量的温室气体. 电解水制氢具有产氢纯度高、工艺简单、转换效率高等优点, 还可直接与可再生能源(如太阳能、风能等)耦合, 是一种很有前景的绿色制氢技术. 碱性电解水, 由于廉价的非贵金属基材料(如Fe、Co、Ni、Cu等)可以在电解槽中很好地工作, 展现出了良好的应用前景.

为了进一步提高非贵金属电催化剂分解水的催化活性, 科研人员从增加活性位点数量和提高单个活性位点的本征活性两方面着手, 发展新的高效电催化剂. 独特的纳米结构设计能够增加催化剂的活性位点数量, 进而提高催化剂的催化活性, 但催化性能的提高程度有限. 增加单个活性位点的本征活性是从本质上提高催化剂活性的另一种有效策略. 其中, 异质原子修饰是提高催化剂本征活性最有效的方法之一, 它可以通过调节催化剂的物理化学性质来提高催化剂的本征活性, 包括诱导相变、提高电导率、调整电子密度和建立双催化位点等.

本文基于电解水析氢反应(HER)和析氧反应(OER)在碱性电解质中的反应路径, 综述了异质原子在增强反应动力学中的关键作用, 特别是异质原子的引入可以直接或间接地优化活性位点与中间体之间的相互作用, 从而提高本征活性. 首先, 总结了一系列具有代表性的异质原子修饰的电催化剂; 其次, 深入讨论了异质原子在OER和HER反应路径中的重要作用; 最后, 提出了异质原子修饰的电极的一些挑战和前景, 旨在从原子层面揭示异质原子对电解水反应机理的影响, 为合理设计高效电解水催化剂提供指导. 本文为构建高效、低成本的电催化剂, 并应用于水电解以及其他能源转化领域提供一些借鉴.

关键词: 碱性分解水, 异质原子修饰, 反应路径, 析氢反应, 析氧反应

Abstract:

Alkaline water splitting is a promising technology for “green hydrogen” generation. To improve its efficiency, highly robust catalysts are required to reduce the overpotential for low electrical power consumption. Heteroatom modification is one of the most effective strategies for boosting catalytic performance, as it can regulate the physicochemical properties of host catalysts to improve their intrinsic activity. Herein, aiming to provide an overview of the impact of heteroatoms on catalytic activity at the atomic level, we present a review of the key role of heteroatoms in enhancing reaction kinetics based on the reaction pathways of the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline media. In particular, the introduction of heteroatoms can directly and indirectly optimize the interactions between the active sites and intermediates, thus improving the intrinsic activity. To clearly illustrate this influence in detail, we have summarized a series of representative heteroatom-modified electrocatalysts and discussed the important roles of heteroatoms in the OER and HER reaction pathways. Finally, some challenges and perspectives for heteroatom-modified electrodes are discussed. We hope that this review will be helpful for the development of efficient and low-cost electrocatalysts for water electrolysis and other energy conversion applications.

Key words: Alkaline water splitting, Heteroatom modification, Reaction pathway, Hydrogen evolution reaction, Oxygen evolution reaction