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通过电化学重建实现一个通过原子修饰的氧化催化剂,以提高氧气进化性能

Changti Pan¹, Jiahui Zhao¹, Baojie Zhang¹

¹Institutes of Physical Science and Information Technology, School of Chemical and Chemistry Science, Anhui University, Hefei, Anhui 230601, China.

Inorganic chemistry

|June 21, 2023

概括

将原子纳入氧化电催化剂显著提高了用于能的氧化演化反应效率. 这种新的格子修改降低了能源障碍,创造了高度活跃和稳定的催化剂.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
催化剂是一种催化剂.

背景情况:

有效的氧化演化反应 (OER) 电催化剂对于可持续的能源生产至关重要.
开发具有增强活性和稳定性的先进催化剂仍然是一个重大挑战.
格子修改为设计高活性催化中心提供了一个有前途的策略.

研究的目的:

为了研究 (Se) 原子结合对氧化 (CoOOH) 电催化剂的OER性能的影响.
设计和制造一种新型的Se-修改的CoOOH电催化剂,具有优越的OER活性.
阐明前催化剂结构与最终催化剂的电化学重建之间的相关性.

主要方法:

理论计算来预测Se纳入对OER活动的影响.
从Co0.85Se前催化剂中合成Se修饰的CoOOH电催化剂的电化学合成.
用X射线吸收光谱 (XAS) 分析Se原子的晶格内置.

主要成果:

理论预测证实,Se的结合有效地通过降低定速阶段的能量障碍来增强OER活动.
制造的Se-modified CoOOH表现出卓越的OER性能,其特点是低超电位和显著的稳定性.
XAS的结果表明,Se在Co0.85Se预催化剂中的优选晶格结合方便了OER过程.

结论:

将Se原子纳入格子是设计优质OER电催化剂的有效策略.
Co0.85Se的电化学激活导致具有增强的催化性能的格子改性CoOOH.
通过电化学重建了解前催化剂-催化剂关系是合理催化剂设计的关键.

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