在工业电流密度CO2的碳点中,氨基功能组和缩原子铁部位的协同效应
Huazhang Guo1, Jithu Raj2, Zeming Wang1
1Institute of Nanochemistry and Nanobiology, School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|March 21, 2024
概括
氨基酸功能化铁碳点促进电催化二氧化碳 (eCO2R) 减少到CO. 这种方法克服了铁酸的限制,在工业电流密度下实现了高选择性和效率.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 具有Me-N4中心的金属酸对于电催化二氧化碳减排 (eCO2R) 是有前途的.
- 铁酸 (FePc) 显示出较低的eCO2R活性,原因是高的CO2到*COOH转化障碍和强大的*CO结合.
- 为二氧化碳转化开发高效的催化剂仍然是一个重大挑战.
研究的目的:
- 开发一种新型的催化剂,以有效的电催化方式将二氧化碳 (eCO2R) 降低为二氧化碳.
- 研究Fe-N4活性位点和氨基功能组对催化剂性能的协同作用.
- 阐明了增强的eCO2R过程中涉及的反应机制和能量障碍.
主要方法:
- 一步溶解热分子融合以合成具有氨基功能化的原子富含Fe的碳点 (Af-Fe-CDs).
- 对于Fe-N4活性位点和高Fe负荷 (高达8.5%重量%) 的Af-Fe-CDs的表征.
- 在工业相关电流密度的流量电池中进行电化学评估,包括现场电化学FTIR和理论计算.
主要成果:
- Af-Fe-CD 显示了明确的 Fe-N4 位点和高 Fe 负载,显示出出色的 CO2 到 CO 转换.
- 在电流密度超过400 mA cm-2时达到>92%的CO选择性,超过现有催化剂.
- 通过协同Fe-N4和氨基功能化,证明了*COOH形成和*CO脱落的降低能量障碍.
结论:
- 在Af-Fe-CD中Fe-N4活性中心和氨基功能组的协同集成显著提高了eCO2R效率.
- 这种方法为设计具有高原子金属负载的高性能电催化剂提供了一个有前途的策略.
- 这些发现为优化催化剂提供了洞察力,以实现高效的二氧化碳利用和转化.
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