在具有伊米达组的共价有机框架中的自我加速效应促进了CO2到CO的电还原
Meng-Di Zhang1, Jia-Run Huang1, Wen Shi1
1MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, Guangdong Basic Research Center of Excellence for Functional Molecular Engineering, School of Chemistry, IGCME, Sun Yat-Sen University, Guangzhou, 510275, China.
一种新的电催化剂,PcNi-im,在酸性条件下增强了电化学二氧化碳的降解到CO. 这种稳定的共价有机框架显示了提高效率和耐用性,减轻了CO中毒和稳定关键中间体.
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:
- 溶剂效应在催化过程中至关重要,但在电化学二氧化碳减排 (eCO2 RR) 中未得到充分研究.
- 开发高效和稳定的eCO2 RR电催化剂对于碳利用至关重要.
研究的目的:
- 调查溶剂条件在eCO2 RR中的作用.
- 引入一种新的共价有机框架 (PcNi-im) 作为eCO2 RR到CO的电催化剂.
- 了解改善催化性能背后的机制.
主要方法:
- 一个稳定的共价有机框架 (PcNi-im) 的合成,其中含有伊米达基.
- 在不同的pH条件下对eCO2 RR的PcNi-im的电化学评估.
- 操作机制研究以阐明性能增强.
主要成果:
- 在酸性条件下 (pH ≈ 1) PcNi-im 证明了高法拉第效率 (≈100%) 对于在酸性条件下 (pH ≈ 1) 的 CO 生产.
- 与中性条件相比,在酸性介质中,部分电流密度从258到320mA cm−2增加.
- 电催化剂在10小时内在250 mA cm-2下表现出稳定的性能,没有显著的降解.
结论:
- 在酸性介质中对伊米达群的质子化通过降低表面工作功能和电荷密度来提高eCO2 RR性能.
- 该机制涉及减弱的CO中毒和稳定的*COOH中间体,加速反应速度.
- PcNi-im是一个有前途的电催化剂,可以有效和稳定地将电化学二氧化碳减少为二氧化碳.
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