独特的氧桥原子对有效地促进了二氧化碳的电化学减少
Chaofan Zhang1, Na Li2, Yuefeng Liu3
1State Key Laboratory of Fine Chemicals, Department of Catalysis Chemistry and Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, P. R. China.
在Ni2N6O/NC催化剂中的原子分散的Ni-O-Ni位点增强了电催化CO2的减少. 这种双原子催化剂设计优化了电子结构,以获得卓越的CO2RR性能,实现高的CO选择性和电流密度.
科学领域:
- 催化剂是一种催化剂.
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
背景情况:
- 由于协同效应,双原子催化剂对电催化二氧化碳减排 (CO2RR) 有希望.
- 调节双原子位点的电子结构是提高CO2RR性能的关键.
- 现有的催化剂在优化性能和稳定性方面面临着挑战.
研究的目的:
- 合成和研究具有Ni-O-Ni位点的原子分散氧桥 Ni2N6O/NC催化剂.
- 通过Ni-OH-Ni网站的现场形成来探索增强CO2RR性能的机制.
- 为了比较新型催化剂与Ni-Ni结合对应物的性能.
主要方法:
- 在N-化碳纳米片上微波热解二核,酸和葡萄糖.
- 使用H细胞设置进行电化学表征.
- 密度函数理论 (DFT) 计算以阐明反应机制.
主要成果:
- 成功合成了具有独特Ni-O-Ni位点的Ni2N6O/NC催化剂.
- 通过H+吸附在现场形成Ni-OH-Ni位点,降低*COOH形成能量屏障.
- 在 -0.7 V 与 RHE 相比,实现了 99.4% 的 CO 法拉代效率和 32.4 mA·cm-2 CO 部分电流密度.
- 通过传统加热制备的超性能Ni2N6/NC催化剂.
结论:
- 在Ni2N6O/NC中的Ni-O-Ni位点对于高效的电催化CO2减排至关重要.
- 在现场形成的Ni-OH-Ni位点促进了*COOH中间形成路径.
- 这项工作为设计 CO2RR 的先进双原子催化剂提供了一个可行的策略.
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