在CO2电还原过程中增强SnOx/AgOx催化剂的稳定性和CO/格式选择性
Yong-Wook Choi1, Fabian Scholten1,2, Ilya Sinev1
1Department of Physics , Ruhr University Bochum , 44780 Bochum , Germany.
Journal of the American Chemical Society
|March 5, 2019
概括
这项研究开发了稳定的锡氧和银氧催化剂,用于将二氧化碳 (CO2) 电降解为有价值的产品. 新的催化剂显著抑制了竞争的演化反应,提高了二氧化碳转化的效率和选择性.
科学领域:
- 电化学
- 催化剂
- 材料科学
背景情况:
- 工业二氧化碳 (CO2) 排放引发了环境问题.
- 电减碳提供了将二氧化碳转化为化学品和燃料的途径.
- 基于银的催化剂具有前景,但受到竞争的演化反应 (HER) 的影响.
研究的目的:
- 开发稳定和选择性的二氧化碳电解催化剂.
- 研究表面特性在增强催化剂性能中的作用.
- 在二氧化碳电还原过程中最大限度地减少演化反应 (HER).
主要方法:
- (Sn) 的电沉积在氧等离子预处理的银 (Ag) 表面上,形成 SnO x / AgO x 催化剂.
- 使用扫描电子显微镜 (SEM),能量散射X射线光谱 (EDS),X射线光电子光谱 (XPS) 和X射线吸收近边结构光谱 (XANES) 的表征.
- 电化学测试以评估催化活性,选择性和稳定性,包括法拉第效率 (FE) 测量.
主要成果:
- SnO x / AgO x催化剂表现出增强的CO和酸盐生产活性和选择性.
- 在20小时内实现了显著的演变反应 (HER) 抑制,FE低于5%.
- 鉴定显示了高度粗的表面,稳定的Sn δ+/Sn物种对性能至关重要.
结论:
- 表面粗,成分和化学状态是有效的二氧化碳电催化剂的关键因素.
- 开发的SnO x/AgO x催化剂为二氧化碳转化提供了稳定和选择性的解决方案.
- 这项工作为设计可持续化学产品的先进电催化剂提供了洞察力.
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