单原子的方向增长和密度调节,以实现高效的电催化演变
Xinyang Liu1, Yuxuan Zhou2, Jingkai Lin3
1School of Materials and Chemistry, University of Shanghai for Science and Technology, 200093, Shanghai, P. R. China.
Angewandte Chemie (International ed. in English)
|May 31, 2024
概括
这项研究引入了一种新的方法,将单原子 (PtSA) 在可调节的氧空缺的二氧化 (CeO2-X) 上,增强进化反应 (HER) 催化. 在CeO2-X/rGO上的最佳PtSA分散显著提高了绿色能源应用的催化活性和稳定性.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 电化学 电化学 电化学
背景情况:
- 单原子催化剂 (SAC) 对于优化催化活性至关重要.
- 调整主机材料特性是提高SAC性能的关键.
- 二氧化 (CeO2-X) 是一个有前途的宿主材料,因为它具有氧空位的可调性.
研究的目的:
- 开发一种新的策略,以控制氧气空缺,在CeO2-X上固定单原子 (PtSA).
- 研究CeO2-X密度对演化反应 (HER) 中PtSA的催化性能的影响.
- 为了优化PtSA在CeO2-X/rGO上的分散和加载,以提高HER活动和稳定性.
主要方法:
- PtSA的定向定通过调整CeO2-X中的氧气空缺.
- 在减少的氧化石墨烯 (rGO) 上PtSA的均分散支持CeO2-X.
- 在酸性和性介质中对HER进行电催化测试.
- 进行全面的实验和理论计算以阐明结构-活动关系.
主要成果:
- PtSA均分散在CeO2-X/rGO上,具有可调节的氧气空缺.
- 最佳催化剂 (PtSA-M-CeO2-X/rGO) 显示出优越的 HER 活性,具有较低的超电位 (25 mV 在 0.5 M H2SO4, 33 mV 在 1 M KOH).
- 在酸性和性条件下,在高电流密度下,经过90小时的特殊稳定性.
结论:
- 拟议的战略有效地调整了CeO2-X中的氧气空缺,以定PtSA,从而提高了HER的性能.
- 在缺陷丰富的CeO2-X上优化了PtSA分散,为催化提供了丰富的活性位点.
- 这项工作为通过缺陷工程进行绿色能源转换开发高度活跃和稳定的SAC提供了有希望的途径.
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