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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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使用基于Co的电催化剂进行选择性的两电子和四电子氧降解反应.

Zuozhong Liang1, Haitao Lei1, Haoquan Zheng1

  • 1Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China. liangzuozhong@snnu.edu.cn.

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本综述探讨了基于的电催化剂如何控制氧降解反应 (ORR) 中的选择性. 了解催化剂结构是指导过氧化生产的两电子 (2e-) 路径或燃料电池的四电子 (4e-) 路径的关键.

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科学领域:

  • 电化学 电化学 电化学
  • 材料科学 材料科学 材料科学
  • 催化剂是一种催化剂.

背景情况:

  • 氧降解反应 (ORR) 对于燃料电池和电池等能量转换装置至关重要.
  • ORR可以通过两种不同的路径进行:一种两电子 (2e-) 路径产生过氧化 (H2O2) 或一种四电子 (4e-) 路径产生水 (H2O).
  • 控制这些路径的选择性对于实际应用至关重要.

研究的目的:

  • 为ORR审查基于的电催化剂的结构选择性关系.
  • 为特定的ORR路径 (2e-或4e-) 提供关于合理设计催化剂的见解.
  • 总结当前的理解,并建议ORR电催化学的未来研究方向.

主要方法:

  • 对ORR基于的电催化剂的现有文献进行审查和讨论.
  • 对ORR的反应机制和选择性评估方法的分析.
  • 专注于色素作为结构选择性研究的模型系统.

主要成果:

  • 基于的电催化剂可以设计为对2e或4e-ORR通路的高选择性.
  • 催化剂的特定结构特征显著影响ORR选择性.
  • 在ORR中阐明基本的结构-活动关系时,类氨酸作为优秀的模型.

结论:

  • 了解控制ORR选择性的结构因素对于催化剂设计至关重要.
  • 基于的催化剂为开发选择性ORR电催化剂提供了一个多功能平台.
  • 本综述为设计针对性ORR应用的先进分子和材料催化剂提供了基础.