纳米曲率诱导的场效应可以控制单原子电催化剂的活性
Bingqing Wang1, Meng Wang1,2, Ziting Fan1
1Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore, 117585, Republic of Singapore.
Nature communications
|February 26, 2024
概括
研究人员通过改变纳米曲率来调整单原子催化剂 (SAC) 中的电场,从而增强电催化剂活性. 这种均的电场调制提高了 CO2 减排等反应的性能,克服了以前方法的局限性.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 调整界面电场对于通过修改吸附剂结合能来控制电催化剂活性至关重要.
- 现有的电场调制方法往往不均,只影响少量活跃点,限制了它们的有效性.
- 基本的缩放关系往往限制了传统电催化剂的性能.
研究的目的:
- 开发一种在电催化剂中实现均和可调节电场调制的策略.
- 研究单原子催化剂 (SAC) 中纳米结构曲率和界面电场之间的关系.
- 为了证明这种战略在增强电催化反应方面具有广泛的适用性.
主要方法:
- 使用单原子催化剂 (SACs),M-N4活性位点支持不同纳米曲率的球形碳.
- 使用现场拉曼光谱与斯塔克轮班记者来量化电场强度.
- 评估了针对二氧化碳 (CO2) 减排的优化SAC的性能.
主要成果:
- 证明,增加碳支的纳米曲率会导致更强的界面电场.
- 展示了可以在SAC中实现的统一电场调制,独立于传统的缩放关系.
- 在降低二氧化碳方面优化纳米曲率的Ni SAC实现了高性能,在酸性介质中达到~400 mA cm-2的部分电流密度,在>99%的法拉代效率下.
结论:
- 使用纳米结构工程的均调节电场调制是一种可行的策略,可以增强电催化剂活性.
- 这种方法有效地克服了缩放关系和非均场效应所带来的局限性.
- 发现的方法对推进广泛的SAC系统和电催化应用,特别是二氧化碳减排,具有重大前景.
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