关于黄金和白金表面的电化学还原反应的光谱研究
Yao Yao1,2, Shangqian Zhu1,2, Haijiang Wang1,2
1Department of Chemical and Biological Engineering, and ‡Energy Institute, The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon, Hong Kong.
Journal of the American Chemical Society
|January 11, 2018
概括
在金 (Au) 催化剂上,的电化学降解为氨,遵循一种关联机制,检测到-物种. 这一发现澄清了反应途径,与 (Pt) 催化剂不同.
科学领域:
- 电化学
- 催化剂
- 表面科学
背景情况:
- 电化学降解为氨是一种有前途的可持续能源转化过程.
- 了解反应机制和中间体对于优化催化剂性能至关重要.
- 黄金基催化剂具有潜力,但反应途径尚不清楚.
研究的目的:
- 阐明在黄金表面的降解反应机制.
- 使用现场光谱识别关键反应中间体.
- 为了比较黄金和的反应路径.
主要方法:
- 使用表面增强红外吸收光谱 (SEIRAS) 进行现场分析.
- 在金色薄膜电极上进行缩.
- 对可逆电极进行电化学电位控制.
主要成果:
- 在0V以下的黄金表面检测到- (N2Hy) 种.
- 特性振动带 (1453,1298,1109厘米-1) 证实了N2H介质.
- 在相同的条件下,在上没有观察到含的中间体.
结论:
- 在黄金上的降解反应是通过关联机制进行的.
- 在添加时,N键会同时断裂.
- 这种机制解释了与相比,黄金在减少方面的效率更高,其中进化占主导地位.
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