控制Ag覆盖层厚度的Cu-Ag合电极,用于可调节的CO2减少
Yojiro Kimura1, Miho Yamauchi1,2,3,4
1Mitsui Chemicals, Inc., Carbon Neutral Energy Research Center (MCI-CNRC), International Institute for Carbon-Neutral Energy Research (I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka-shi, Fukuoka, 819-0395, Japan.
在铜催化剂上调整银层厚度,精确地控制电化学二氧化碳减排的产品选择性. 优化的白银厚度可以提高甲产量,同时影响其他C2+产物.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 电化学二氧化碳减排 (eCO2R) 对于可持续的化学生产至关重要.
- 将CO选择性金属 (例如,Ag) 与C-C合金属 (例如,Cu) 结合在一起的并列催化剂提供可调节的产品选择性.
- 控制界面属性是优化催化剂性能的关键.
研究的目的:
- 为了研究银外层厚度对eCO2R的Cu-Ag合电极的影响.
- 了解纳米尺度厚度变化如何影响产品分布和反应途径.
- 为了确定白银覆盖层厚度作为催化剂设计的可调节参数.
主要方法:
- 使用物理蒸汽沉积制造精确控制的银层厚度 (0.9-150 nm) 的Cu-Ag双电极.
- 在流电池条件下的电催化性能评估.
- 在现场拉曼光谱检测,以确定反应中间体.
主要成果:
- 产品选择性显示出对银厚度的非单调依赖.
- 甲 (CH4) 形成显著增强,峰值在10nm银厚度.
- C2+选择性最初随着银的厚度增加而降低到10nm,然后增加.
- 在现场拉曼光谱表明,在*CHx-CO和*CHx-H路径之间存在厚度依赖的竞争.
结论:
- 银表面层厚度是控制Cu-Ag合催化剂eCO2R选择性的关键参数.
- 通过控制的银沉积来优化接口结构,使得量身定制的产品形成成为可能,例如增强的甲生产.
- 这项工作为有效的电化学二氧化碳转化提供了对催化剂设计的见解.
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