酸进化电催化在高合金中的电催化与其零电荷的成分依赖潜力相关
Moonjoo Kim1,2, Emmanuel Batsa Tetteh1, Olga A Krysiak1
1Analytical Chemistry-Center for Electrochemical Sciences (CES), Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Universitätsstr. 150, D-44780, Bochum, Germany.
Angewandte Chemie (International ed. in English)
|August 3, 2023
概括
这项研究表明,高合金电催化剂的零电荷点 (PZC) 直接影响演化反应 (HER) 活动. 优化PZC为设计高效的HER电催化剂提供了新的途径.
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:
- 高合金 (HEAs) 为催化剂设计提供了广泛的元素组合.
- 了解活动描述符对于合理的电催化剂开发至关重要.
- 零电荷点 (PZC) 正在引起演变反应 (HER) 电催化剂的注意,但其在HEAs中的作用尚未被探索.
研究的目的:
- 确定一个 Pt-Pd-Ru-Ir-Ag HEA 材料库 (HEA-ML) 的 PZC 和 HER 活动.
- 研究HEA成分,PZC和HER活性之间的关系.
- 建立基于PZC的HEA电催化剂的设计原则.
主要方法:
- 利用扫描电化学细胞显微镜 (SECCM) 进行精确的PZC和HER活动测量.
- 制造了一种多样化的HEA-ML,具有不同的元素组成.
- 进行统计分析以确保确定PZC和活动数据的可靠性.
主要成果:
- 建立了Pt-Pd-Ru-Ir-Ag HEA的PZC与其组合加权平均工作函数之间的线性相关性.
- 在酸性介质中的HER电流密度与PZC之间显示出正相关性.
- 解释了观察到的HER活性增强通过H+在PZC负潜力的H+预度.
结论:
- PZC是预测和优化HEA中HER活动的关键描述符.
- HEA组成影响PZC,为电催化剂设计提供可调节的参数.
- 这项工作为HER的高性能HEA电催化剂的合理设计提供了基础.
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