表面吸附的基:电化学CO2的双刃剑 减少氧化物衍生的铜
Daixing Wei1, Yiqing Wang1, Chung-Li Dong2
1International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
Angewandte Chemie (International ed. in English)
|June 19, 2023
概括
氧化物衍生铜 (OD-Cu) 与纳米级表面颗粒增强了电化学二氧化碳减排 (ECO2RR). 在OD-Cu上的表面基 (OHad) 通过促进CO二元化,促进选择性多碳 (C2) 产品的形成.
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 (ECO2RR) 对于可持续的碳利用至关重要.
- 为选择性多碳 (C2) 产品形成开发高效的催化剂仍然是一个挑战.
- 表面结构和吸附物种显著影响ECO2RR通路.
研究的目的:
- 开发具有纳米尺度表面特征的氧化物衍生铜 (OD-Cu) 催化剂,以增强 ECO2RR.
- 研究表面吸附基 (OHad) 在C2产品选择性中的作用.
- 为了优化OD-Cu在流量细胞中的性能,以实现稳定和选择性的C2生产.
主要方法:
- 通过表面结构重建合成OD-Cu,产生20nm以下的纳米粒子.
- 在现场进行光谱调查,以在ECO2RR期间识别和描述OHad.
- 理论计算以阐明OHad介导的CO二分化机制.
- 在高电流密度的流动电池中评估电化学性能.
主要成果:
- OD-Cu催化剂表现出位于表面的20nm以下的纳米粒子.
- 表面OHad物种被纳米颗粒严格限制,被确定为C2选择性的关键.
- OHad促进*CO吸附和二元化,有利于C2的产生,但过度的OHad抑制了选择性.
- 在流量细胞中,在 -200 mA cm-2 时实现了稳定的 C2 生产,具有 ~60% 的选择性.
结论:
- 具有受控纳米粒子形态的OD-Cu有效地引导OHad吸附用于选择性的ECO2RR.
- 这些发现提供了对OHad在C2选择性和H2进化中的双重作用的机制理解.
- 这项工作表明了设计用于高效二氧化碳转化先进催化剂的有希望的策略.
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