在Pd基电催化剂上引导中间体的吸收配置,以实现高效和稳定的CO2减少
Shuting Wei1,2, Yanchao Xu1, Tao Song3
1Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Kowloon 999077, Hong Kong, China.
Journal of the American Chemical Society
|January 24, 2025
概括
这项研究引入了一种使用铜和加的纳米板来防止二氧化碳中毒的新方法. 这提高了催化剂的稳定性和二氧化碳生产的选择性.
科学领域:
- 电化学
- 材料科学
- 催化剂
背景情况:
- (Pd) 催化剂对电化学 CO2 降解为 CO 有效.
- 由于Pd位点的强烈CO吸附,催化剂因CO中毒而失活,限制了性能.
- 了解CO吸附配置是改善催化剂稳定性的关键.
研究的目的:
- 制定一种策略,以减轻二氧化碳电子减排的Pd基催化剂中的CO中毒.
- 通过使用超薄的Pd纳米板来提高CO生产的选择性和稳定性.
- 研究Cu和Zn对CO吸附配置和催化剂性能的影响.
主要方法:
- 合成超薄的铜 (PdCuZn) 纳米板 (NS).
- 包括二氧化碳降低潜力窗口和法拉第效率 (FECO) 的电化学表征.
- 现场光谱,X射线分析和理论模拟以研究催化剂结构和CO吸附.
主要成果:
- 在一个广泛的潜在窗口中,PdCuZn NSs催化了CO的产生 (-0.28到-0.78V与RHE).
- 在 - 0.35 V 时达到最大 96% 的 FECO,具有极好的稳定性 (在 ~ 95% 的 FECO 时达到 100 小时).
- 编码优化了Pd电子结构,削弱了*CO结合,并支持线性*CO配置.
结论:
- 同时将Cu和Zn纳入PdNS可以有效地缓解CO中毒.
- 该策略优化了*CO吸附配置,减少了脱吸能量障碍.
- 这项工作为开发高选择性和稳定的基于Pd的二氧化碳转化电催化剂提供了设计原则.
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