单原子站点与协同多重协调用于电化学H2O2生产
Gangya Wei1, Yunxiang Li2, Xupo Liu3
1School of Chemistry and Chemical Engineering, Henan Normal University, 453007, Xinxiang, Henan, P. R. China.
Angewandte Chemie (International ed. in English)
|October 4, 2023
概括
本研究引入了一种新方法,用于创建具有精确控制的协调环境的单原子催化剂 (SAC). 这些新型催化剂有效地将氧气转化为过氧化,具有高选择性和稳定性.
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) 提供高效率,但控制它们的协调环境是具有挑战性的.
- 在SAC中同时设计多个协调外对于优化催化性能至关重要.
- 开发先进的催化剂来选择性减少氧气到过氧化至关重要.
研究的目的:
- 制定一个一般的两步策略,用于制造空洞的碳基SAC,并进行多工程协调.
- 研究基于Zn的SACs调节第一个和更高的协调的协同效应.
- 为了实现高度选择性的过氧化的电化学生产.
主要方法:
- 使用两步策略制造空心碳基单原子催化剂 (SACs).
- 将硫原子纳入Zn-N2O2部分 (Zn-N2O2-S) 的高协调中.
- 电化学表征用于评估氧降解反应 (ORR) 对于过氧化生产的性能.
主要成果:
- Zn-N2O2-S SACs在第一个 (N2O2) 和更高的 (S) 协调之间表现出协同效应.
- 优化Zn位点的电子结构可促进选择性O2降低到H2O2.2.
- 在H2O2生产中实现了96%的选择性,在80 mA cm-2下达到6.924 mol gcat-1 h-1的速度,以及93.1%的法拉第效率.
- 在65小时内表现出极好的耐用性.
结论:
- 在Zn-N2O2-S SAC中设计的多协调环境是高催化性能的关键.
- 这一战略为设计用于选择性电化学合成的先进SAC提供了一条途径.
- 开发的SAC显示了高效和可持续的过氧化生产的巨大潜力.
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