在电催化剂-电解质接口的纳米电子转移变化通过in Situ导电原子力显微镜解决
Martin Munz1,2, Jeffrey Poon2, Wiebke Frandsen2
1Helmholtz Young Investigator Group Nanoscale Operando CO2 Photo-Electrocatalysis, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, 14109 Berlin, Germany.
Journal of the American Chemical Society
|February 22, 2023
概括
这项研究使用相关原子力显微镜 (AFM) 来绘制铜金电催化剂的纳米电和摩擦特性. 结果揭示了电解质组成如何影响二氧化碳的界面电荷转移.
科学领域:
- 材料科学
- 电化学
- 表面科学
背景情况:
- 对于设计高效的电催化剂来说,了解固体电解质界面的材料性能的空间变化至关重要.
- 目前的方法往往缺乏纳米级分辨率,无法在现场同时探测电气,化学和形态特征.
研究的目的:
- 介绍和展示相关原子力显微镜 (AFM) 方法,用于同时纳米尺度探测界面特性.
- 在不同条件下研究二金属铜金系统在二氧化碳电解过程中的结构性质关系.
主要方法:
- 相关原子力显微镜 (AFM) 用于同时测量电导率,化学摩擦性质和形态.
- 在空气,水和碳酸电解质中进行现场测量,以分析铜金双金属系统.
- 使用电流-电压曲线和摩擦成像来评估纳米级的界面行为.
主要成果:
- 确定了电阻氧化铜 (CuO) 岛屿,与当地的电流对比相关.
- 摩擦成像显示了从水到电解质过渡时的水化层分子排序的变化.
- 黄金上的纳米电流映射显示了电阻粒边界和电催化不活跃的附加层区域,电流减少与摩擦增加有关.
结论:
- 这项研究证明了相关AFM能够在现场提供纳米尺度的电催化剂界面特性.
- 电解质组成和吸附物种显著影响表面电荷转移和分子排序.
- 这些发现有助于在催化和能量转换研究中开发现场结构-属性关系.
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