动态 (地表) 氧使得高效的碳结合能够用于电化学二氧化碳减排
You-Chiuan Chu1, Kuan-Hsu Chen1, Ching-Wei Tung2
1Department of Chemistry and Center for Emerging Materials and Advanced Devices, National Taiwan University, Taipei, 10617, Taiwan.
Advanced materials (Deerfield Beach, Fla.)
|April 15, 2024
概括
高价值的铜种在电化学二氧化碳减排中促进多碳生产. 一个新的描述符, (表面下氧化度 (κ),准确量化这些活性物种,提高多碳产量.
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:
- 众所周知,高价值铜种 (Cu+) 在电化学二氧化碳还原反应 (CO2RR) 中增强了多碳的产生.
- 然而,在CO2RR过程中,不一致的平均价值状态和Cuδ+的动态变化导致了对理解它们的机制和作用的模两可.
- 精确确定活性高价值Cu物种具有挑战性,阻碍了对增强多碳生产的机制性见解.
研究的目的:
- 提出一个新的描述符, (地表下) 氧化度 (κ),以量化活跃的高价值Cu物种.
- 为了研究 κ 与 CO2 的多碳生产效率之间的相关性,RR.
- 阐明高价值Cu物种在调节碳 (*CO) 合以增强C2+产品形成中的作用.
主要方法:
- 开发和应用 (地表下) 氧化度 (κ) 作为活性高价值Cu物种的描述符.
- 电化学CO2还原反应 (CO2RR) 实验使用优化的Cu2O@Pd2.31催化剂.
- κ描述符和催化性能指标之间的相关性分析,包括*CO合效率和多碳部分电流密度.
主要成果:
- (表面下) 氧化度 (κ) 有效量化了催化剂表面上活跃的高价值Cu物种.
- 证实了 κ 与碳烯 (*CO) 合的效率之间存在强烈的相关性,这是多碳生产的关键步骤.
- 一个优化的Cu2O@Pd2.31催化剂实现了高的多碳部分电流密度≈330 mA cm-2,具有83.5%的法拉达效率,归因于优化的 κ值.
结论:
- (表面下) 氧化度 (κ) 作为调节CO2RR中的多碳生产的关键因素.
- 这项工作提供了一种有希望的方法,可以准确地揭示高价值Cu物种在CO2电还原中的作用.
- 这些发现有助于合理设计有效的多碳合成催化剂,推动实现碳中和的努力.
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