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隔离Cu-Zn在有序金属间的活性位点,以增强酸盐-氨电还原

Jiao Lan¹, Zhen Wang¹, Cheng-Wei Kao²

¹College of Materials Science and Engineering, Hunan University, Changsha, Hunan, 410082, China.

Nature communications

|November 23, 2024

概括

一种新的纳米孔性铜单原子合金催化剂有效地将化物转化为氨,为Haber-Bosch提供了一个可持续的替代品. 这种电催化剂在生产氨方面表现出高的选择性和稳定性.

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:

传统的氨合成依赖于能源密集的哈伯-博什工艺.
电催化方法提供了一个更绿色的替代方案,但在活性和选择性方面面临挑战,特别是在低度的反应物中.
将化物减少为氨是一种可持续固的有希望的途径.

研究的目的:

开发一种高效和选择性的电催化剂,用于将化物减少为氨.
为了研究这种增强的催化性能背后的机制.
为了证明拟议的催化剂系统的稳定性和可扩展性.

主要方法:

纳米孔隙金属间单原子合金CuZn (np/ISAA-CuZn) 的合成.
电化学表征,包括循环电压测量和时测量.
在现场实验研究和密度函数理论 (DFT) 计算以阐明反应机制.

主要成果:

在np/ISAA-CuZn催化剂实现了超过95%的Faradaic效率生产氨.
催化剂在广泛的潜能范围内显示出最高的能量效率,约为59.1%.
经过220小时的500 mA cm−2稳定运行,具有80%的氨法拉代克效率和100%的化物去除.
DFT的计算显示,孤立的Cu-Zn活性点减轻了*NO2的质子化屏障,促进了选择性氨形成.

结论:

开发的np/ISAA-CuZn电催化剂对于选择性降解酸盐到氨非常有效.
催化剂的性能归因于孤立的Cu-Zn活性位点的强烈电子相互作用,增强质子化动力学.
这项工作提出了通过电催化剂实现可持续氨合成的有希望的策略.

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