催化学报 ›› 2023, Vol. 48: 15-31.DOI: 10.1016/S1872-2067(23)64427-4

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碳基氧还原电催化剂: 机理研究和多孔结构

张文静, 李静*(), 魏子栋*()   

  1. 重庆大学化学化工学院, 重庆401331
  • 收稿日期:2023-02-14 接受日期:2023-02-26 出版日期:2023-05-18 发布日期:2023-04-20
  • 通讯作者: * 电子信箱: lijing@cqu.edu.cn (李静), zdwei@cqu.edu.cn (魏子栋).
  • 基金资助:
    国家自然科学基金(22279012);重庆市自然科学基金(CSTB2022NSCQ-MSX1167)

Carbon-based catalysts of the oxygen reduction reaction: Mechanistic understanding and porous structures

Wenjing Zhang, Jing Li*(), Zidong Wei*()   

  1. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China
  • Received:2023-02-14 Accepted:2023-02-26 Online:2023-05-18 Published:2023-04-20
  • Contact: * E-mai: lijing@cqu.edu.cn (J. Li), zdwei@cqu.edu.cn (Z. Wei).
  • About author:Jing Li received her B.A. degree from Tianjin University in 1999, and Ph.D. degree from National University of Singapore in 2008. After postdoctoral research at the Fudan University, she joined the faculty of Tongji University as an associate professor in 2011 and Chongqing University as a professor in 2014. She has been in charge of 2 National Key Research and Development Program of China and 3 National Natural Science Foundation of China. Her research interests include porous materials, fuel cells and electrocatalysis. She has published more than 80 papers with citation over 8000 times.
    Zidong Wei is Professor in School of Chemistry and Chemical Engineering, Chongqing University. He received Bachelor degree from Shaanxi University of Science & Technology (1984), and Ph.D. degree from Tianjin University (1994). He has been in the field of electrochemical catalysis for more than 30 years and has published more than 300 papers with citation over 22000 times. He has been the Chief Scientist of the National Key Research and Development Program and the Chief Scientist of the National Natural Science Foundation. He edited or participated in the compilation of "Electrochemical Catalysis", "Chemical Process Intensification", "Electrocatalysis", “Electrocatalytic Oxygen Reduction Reaction” and other books. He won the first, second and third prizes of provincial and ministerial level natural sciences and technological progress once each. He is a council member in the Chemical Industry and Engineering Society of China, and Chinese Chemical Society.
  • Supported by:
    National Natural Science Foundation of China(22279012);Natural Science Foundation of Chongqing, China(CSTB2022NSCQ-MSX1167)

摘要:

由于快速增长的能源需求和日益紧迫的环境问题, 清洁和可再生能源的开发受到全球范围的高度关注. 质子交换膜燃料电池(PEMFC)可以直接把燃料所具有的化学能转换为电能, 具有转化效率高、环境污染小和比能量高等优点, 广泛应用于汽车、飞机等交通工具以及固定电站等领域. PEMFC中阴极侧的氧还原反应(ORR), 由于多重质子-电子转移和固有的缓慢动力学, 是影响燃料电池整体效率的重要因素. Pt基催化剂由于能够提供较好的催化性能而被认为是较好的阴极材料. 然而, 广泛使用的Pt基催化剂因成本较高和资源短缺等问题严重阻碍了PEMFC的大规模应用. 因此, 设计开发非贵金属阴极催化剂对于降低催化剂的成本十分必要. 其中, 碳基催化剂因具有较好的导电性和化学稳定性, 已经成为ORR领域中贵金属催化剂强有力的替代品之一.
本文从碳基催化剂的活性位点和孔道结构出发, 系统总结和讨论了提高催化剂活性、稳定性和抗中毒性能等方面的研究进展. 首先, 简单介绍了ORR反应的机理以及碳基催化剂在反应过程中存在的主要问题, 即本征活性低, 活性位密度低, 体积密度小以及稳定性差等. 然后, 针对以上问题, 提出了构筑高活性和高稳定性碳基催化剂的策略. 在碳载体中掺杂适量的杂原子和金属原子有助于构建具有高本征活性的催化位点, 将金属纳米颗粒设计成原子级和超小纳米团簇有助于增加活性位点的数目. 对于目前使用最广泛的Fe-N-C催化剂, 从理论上解释了其在酸性介质中活性位点极易失活的主要原因, 提出制备具有优异稳定性ORR催化剂的解决方案. 孔道结构作为催化剂微观结构的重要组成部分, 对活性位点的分布和传质具有十分重要的影响. 从合成策略和不同孔径大小对ORR性能影响的两个角度出发, 具体论述了现有文献中所报道的制备微孔、介孔和大孔三种孔道结构的方法, 同时详细讨论了三种孔结构在ORR中的作用. 最后, 基于活性位点的设计和多孔结构的构建, 对设计和制备高效碳基电催化剂进行了总结, 展望了碳基催化剂未来的发展和研究思路.

关键词: 碳基催化剂, 氧还原反应, 活性位点, 多孔结构, 电催化剂

Abstract:

Carbon-based catalysts are potential substitutes for noble-metal catalysts in the oxygen reduction reaction (ORR) owing to their excellent electrical conductivities and chemical stabilities. To rationally design and accelerate the identification of highly efficient carbon-based ORR catalysts, improving the design of the active sites and microstructures is necessary. In this review, strategies for improving the intrinsic performances, activities, stabilities, and anti-poisoning properties of catalysts are analyzed. As a critical component of the microstructure, the porous structures of catalysts significantly affect their distributions of active sites and levels of mass transfer, which are also extensively analyzed. Finally, based on the formation of active sites and the fabrication of porous structures, conclusions and perspectives regarding the future development of highly efficient carbon-based electrocatalysts are provided.

Key words: Carbon-based catalyst, Oxygen reduction reaction, Active site, Porous structure, Electrocatalyst