使用不同混合模式的双金属Cu-Pd催化剂将二氧化碳转化为碳化合物
Sichao Ma1,2, Masaaki Sadakiyo2,3, Minako Heima2,3
1Dept. of Chemistry and Chemical and Biomolecular Engineering, UIUC , 600 S. Mathews Ave., Urbana, Illinois 61801, United States.
Journal of the American Chemical Society
|December 14, 2016
概括
研究人员探索了电化学二氧化碳 (CO2) 转换的双金属铜 (Cu-Pd) 催化剂. 订购的Cu-Pd催化剂选择性地产生C1化学物质,而相隔催化剂则偏爱C2化学物质,提供可调节的CO2利用.
科学领域:
- 电化学和催化
- 材料科学
- 环境化学
背景情况:
- 二氧化碳的电化学转化对于二氧化碳的利用和可再生能源的储存至关重要.
- 铜 (Cu) 是二氧化碳转化为碳化合物的主要电催化剂,但缺乏选择性,产生各种产品.
- 开发特定的二氧化碳减排产品的高度选择性催化剂至关重要.
研究的目的:
- 调查二金属Cu-Pd催化剂的二氧化碳减排不同原子安排.
- 确定影响二氧化碳电催化中的C1或C2化学物质选择性的关键因素.
- 了解几何和电子效应在催化剂性能中的作用.
主要方法:
- 合成并研究了各种有序,无序和相隔结构的双金属Cu-Pd催化剂.
- 在CO2电还原过程中分析了C1 (例如,CO) 和C2 (例如,乙烯) 产品的催化剂选择性.
- 使用表面价值带光谱探测电子和几何性质.
主要成果:
- 对C1产品,有序的CuPd (1:1原子比) 具有最高的选择性 (> 80%).
- 与其他方案相比,相隔CuPd和Cu3Pd催化剂对C2产品的选择性提高了 (> 60%).
- 而不是电子效应,被认为是决定选择性的主要因素.
结论:
- 调整双金属Cu-Pd催化剂的几何布局可以从CO2中选择性地产生C1或C2化学物质.
- 催化剂表面上的邻近Cu原子促进C1中间体的二元化为C2产品.
- 这些发现为设计高效的二氧化碳电降解的先进催化表面提供了洞察力.
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