在现场ATR-SEIRAS的二氧化碳减少在等离子银阴极
Elizabeth R Corson1, Recep Kas2, Robert Kostecki
1Department of Chemical and Biomolecular Engineering, University of California, Berkeley, California 94720, United States.
Journal of the American Chemical Society
|May 30, 2020
概括
照亮银 (Ag) 阴极通过帮助CO脱落和增加局部pH来增强二氧化碳 (CO2) 的减少. 这种由局部表面等离子体共振 (LSPR) 驱动的光子效应抑制了 (H2) 进化.
科学领域:
- 电化学
- 材料科学
- 光谱学
背景情况:
- 通过银 (Ag) 阴极观察到二氧化碳减少的等离子增强.
- 底层的等离子机制仍然不清楚,光子效应被证实超过热效应.
研究的目的:
- 在Ag阴极上减少CO2时阐明等离子体增强机制.
- 研究光在调节反应路径和表面物种中的作用.
主要方法:
- 在现场使用减弱的全反射面增强红外吸收光谱 (ATR-SEIRAS).
- 在和0.1MKHCO3中研究了Ge ATR晶体上的喷射薄膜Ag阴极.
- 在黑暗和照明 (365 nm) 条件下进行测量.
主要成果:
- 在明暗两种情况下,二氧化碳降解为吸附的二氧化碳的开始潜力为- 0. 25 V RHE.
- 在照明下观察到气态CO产生在-0.25V RHE,但在黑暗中不到-0.5V RHE,这表明光辅助的CO脱吸.
- 照明导致HCO3波数和峰值面积立即增加,表明非热光子效应.
结论:
- 光线显著提高了二氧化碳的减少,因为它促进了二氧化碳从表面的脱落.
- 局部表面等离子共振 (LSPR) 产生增强的局部电场,加强HCO3-键并增加局部pH.
- 这种pH的增加抑制了H2的演变,并促进了CO2的减少产物.
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