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Updated: May 31, 2025

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调节原子分散的协调环境,以有效的电催化CO2降低低超电位和工业电流密度

Yichen Sun¹, Xiaolu Liu¹, Jiazheng Tian¹

¹College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, P. R. China.

|January 23, 2025

概括

在富含的碳 (O-Ni-N-GC) 上的原子分散催化剂实现了高的CO2-CO转化效率. 这些催化剂在工业电流密度下表现出极好的选择性和稳定性,为减少二氧化碳提供了有希望的解决方案.

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:

电催化二氧化碳降解为二氧化碳对于碳利用至关重要,但在非贵金属催化剂方面面临挑战.
在低超电位和高电流密度下实现高CO选择性 (FECO) 仍然是一个重大障碍.

研究的目的:

开发一种非贵金属催化剂,用于高效的电催化CO2转化为CO.
研究原子分散位的性能和机制,这些位点支在石墨的富含的多孔碳上.

主要方法:

富含N的石墨式多孔碳的合成,以轴向氧 (O-Ni-N-GC) 支持原子分散的.
在CO2RR流细胞中使用循环电压测量,时测量和操作光谱学进行电化学评估.
密度函数理论 (DFT) 计算以研究反应机制.

主要成果:

在低超电位 (17-60 mV) 时,O-Ni-N-GC表现出高FECO (>92%) 在工业电流密度 (200-900 mA·cm-2) 时接近100%的FECO.
在 1 A·cm-2 实现了最先进的 FECO (>96%),转速频率为 81.5 s-1 在 1 M KOH 中.
证明了出色的稳定性 (>140小时在100mA·cm-2下运行,FECO>99%).

结论:

O-Ni-N-GC催化剂有效地促进了高选择性和稳定的CO2到CO的转化.
轴氧和富含N的碳支优化了Ni位点的电子结构,促进了CO2的激活和CO的吸附.
这种催化剂设计为实际的二氧化碳电还原应用提供了一个有前途的途径.

关键词:

二氧化碳的电还原 CO2 的电还原.在NiN4-O位点.安培级电流密度的当前密度.在高FECO的情况下.金属 - - 碳

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