在CO2电解剂中对产品形成的局部pH影响
Victor D Brandão1, Oliver Long1, Sean Zhong1
1School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.
在二氧化碳电解器中的高温会在铜催化剂附近产生显著的pH梯度. 这种改变的微环境会影响产品的形成,在更高的温度下有利于C1中间体而不是所需的多碳产品.
科学领域:
- 电化学
- 催化剂
- 光谱学
背景情况:
- 大规模的二氧化碳电解器对于碳捕获和利用至关重要.
- 在高温下运行电解剂对于效率是可取的,但人们对其了解甚少.
- 催化剂附近的微环境,特别是pH值,对于减少二氧化碳至关重要.
研究的目的:
- 在减少二氧化碳过程中研究温度对催化剂微环境的影响.
- 确定局部pH在高温产品选择性的作用.
- 将表面pH与二氧化碳减少产物的形成相关联.
主要方法:
- 使用共聚焦拉曼光谱测量局部pH值.
- 在不同温度下进行电化学测量 (-0.6V应用电位).
- 进行了产品分析,并与表面pH值测量相关联.
主要成果:
- 较高的温度显著增加了表面到散装的pH梯度.
- 在75°C时,pH值的差异大于25°C时的1.8个单位.
- 高表面pH值 (9.9) 有利于在45°C以下的C2+产品,但在55°C以上的表面pH值>10.3阻碍了C-C合.
结论:
- 当地pH值是控制高温二氧化碳降解产物的关键因素.
- 电解剂可能在室温下比假设更的条件下工作.
- 优化温度和pH值对于高效的多碳产品形成至关重要.
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