化学结构稳定的多原子涂层在酸性CO2电解中调节质子介质景观
Bárbara Polesso1, Adrián Pinilla-Sánchez1, Eman H Ahmed1,2
1ICFO-Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, Castelldefels (Barcelona) 08860, Spain.
Journal of the American Chemical Society
|July 29, 2025
概括
一种新型的聚烯涂层增强了酸性介质中的二氧化碳电还原. 这种策略通过控制当地的质子和中间环境来提高多碳产品的选择性和效率.
科学领域:
- 电化学
- 材料科学
- 催化剂
背景情况:
- 二氧化碳电降解 (CO2R) 的酸性介质提供了高碳利用率,但由于质子和中间体的竞争,在实现高选择性和多碳产品的速度方面面临挑战.
- 基于铜的气体扩散电极是CO2R的基准催化剂.
研究的目的:
- 在酸性CO2R中开发一种用于调节局部质子和中间环境的策略.
- 在CO2R过程中提高多碳 (C2+) 产品的选择性和效率.
主要方法:
- 开发了一种融合氨基 (来自PEI) 和硫酸盐/两性 (来自PFSA) 功能的多体涂层.
- 在铜气扩散电极上涂上聚烯涂层.
- 使用0. 5M K2/H2SO4在pH2和0. 3A cm-2的电流密度评估了性能.
主要成果:
- 在广泛的pH范围 (2-14) 中,聚烯涂层显示了H结合相互作用和稳定的结构性质关系.
- PFSA域控制*CO中间体和局部离子环境,而胺则调节质子可用性和中间稳定性,增强C-C合.
- 优化的涂层实现了61%的C2+法拉代效率和84%的单通二氧化碳利用率,转化效率为64%的C2+产品.
- 与单一功能涂料相比,这意味着C2+选择性提高了约30%,碳利用率增加了约35%.
结论:
- 聚胺涂层有效调节酸性介质中的CO2R微环境,克服质子和中间竞争的局限性.
- 这种方法显著提高了基于铜的电极对C2+产品的性能.
- 这些发现为设计高效二氧化碳转换的先进催化剂提供了新的策略.
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