石墨烯/石墨烯异构结构:一种通用的二维支架,用于选择性和持久性CO2电还原
Huoliang Gu1, Lixiang Zhong2, Guoshuai Shi1
1Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200438, China.
Journal of the American Chemical Society
|June 2, 2021
概括
一种新的石墨烯/石墨烯支架支持分散的二氧化碳 (CO2R) 降解,产生具有高选择性和耐久性的碳中和燃料.
科学领域:
- 催化剂
- 材料科学
- 电化学
背景情况:
- 电化学二氧化碳减排 (CO2R) 为碳中和燃料提供了一条可持续的途径,但由于其缓慢的动力学,它在催化剂效率,选择性和稳定性方面面临挑战.
- 开发具有定制结构的先进电催化剂对于克服CO2R的这些局限性至关重要.
研究的目的:
- 设计和研究石墨烯/石墨烯 (GDY/G) 异构结构作为一个2D导电支架,用于固单分散甲 (CoPc).
- 评估CO2减排的GDY/G异构的电催化性能,重点关注活性,选择性和耐用性.
主要方法:
- GDY/G异构的合成和CoPc的定
- 先进的特征技术,包括基于同步射线的X射线吸收光谱 (XAS).
- 密度函数理论 (DFT) 计算以了解电子相互作用.
- 在H电池和液体流量电池中进行电化学测量,以评估法拉第效率 (FE) 和电流密度等性能指标.
主要成果:
- GDY/G支架有效地固定了单分散的CoPc,显示出高的CO2R活性,选择性和耐用性.
- 在H细胞中达到96%的高FE_CO,在流量细胞中达到97%的高FE_CO,在24小时内运行稳定.
- 由于石墨烯的导电性和高表面积,GDY和CoPc之间强大的电子合,协同增强了催化性能.
- 每站点的CoPc循环频率在-1.0V与RHE相比达到37s-1,超过现有的氨酸和氨酸催化剂.
结论:
- GDY/G异构为单分子分散的CoPc提供了有效的二维导电支架,显著提高了CO2R性能.
- 这种混合架构方法显示了用于可持续能源转换的先进CO2R电催化剂的设计潜力.
- 该方法可扩展到其他有机金属复合物,用于各种催化应用.
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