不对称的活性位点促进氧气进化反应的反应.
Linkai Han1, Haifeng Yu1, Zhonghua Xiang1
1State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, PR China.
Small (Weinheim an der Bergstrasse, Germany)
|June 15, 2023
概括
原子分散的过渡金属--碳催化剂提供了增强的氧化演化反应 (OER) 活性. 不对称的活性位点通过优化氧吸附来提高OER性能,优于对称的活性位点.
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:
- 具有原子分散活性位的过渡金属--碳材料是氧演化反应 (OER) 的有希望的催化剂.
- 对称的活性部位往往由于低于最佳的氧物种吸附而患有较差的OER内在活性.
- 开发具有定制活性位点的催化剂对于高效的电催化是至关重要的.
研究的目的:
- 设计和合成一种具有不对称活性位点的新型催化剂,以提高OER性能.
- 研究不对称活性位点对氧物种吸附和OER内在活性的影响.
- 为了评估催化剂在性水电解仪 (AWE) 中的性能.
主要方法:
- 在子选中,以确定最佳的过渡金属.
- 基于g-C3N4.4.的不对称金属--碳活性位点 (a-MN4@NC) 的合成
- 电化学表征包括超电位测量和性水电解试验.
主要成果:
- 与对称部位相比,不对称的活性部位 (a-CoN4@NC) 显示本质活性增强了48.4%.
- 催化剂对OER的启动潜力为179mV.
- 在AWE装置中,a-CoN4@NC催化剂在1.7V时达到150mA cm-2和在2.1V时达到500mA cm-2的电流密度.
结论:
- 不对称的活性位点有效调节氧物种吸附,导致更高的OER内在活性.
- 开发的a-CoN4@NC催化剂显示了高效水分应用的巨大潜力.
- 这项工作通过操纵活性位点对称性来设计高性能电催化剂的新策略.
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