普鲁士蓝
化学
催化作用
析氧
电化学
氧化物
无机化学
人工光合作用
钴
氧气
氰化物
分解水
产量(工程)
蚀刻(微加工)
化学工程
电催化剂
电极
光催化
材料科学
冶金
有机化学
物理化学
工程类
图层(电子)
作者
Lijuan Han,Pengyi Tang,Álvaro Reyes-Carmona,Bárbara Rodríguez-García,Mabel Torréns,J.R. Morante,Jordi Arbiol,José Ramón Galán‐Mascarós
摘要
The development of upscalable oxygen evolving electrocatalysts from earth-abundant metals able to operate in neutral or acidic environments and low overpotentials remains a fundamental challenge for the realization of artificial photosynthesis. In this study, we report a highly active phase of heterobimetallic cyanide-bridged electrocatalysts able to promote water oxidation under neutral, basic (pH < 13), and acidic conditions (pH > 1). Cobalt–iron Prussian blue-type thin films, formed by chemical etching of Co(OH)1.0(CO3)0.5·nH2O nanocrystals, yield a dramatic enhancement of the catalytic performance toward oxygen production, when compared with previous reports for analogous materials. Electrochemical, spectroscopic, and structural studies confirm the excellent performance, stability, and corrosion resistance, even when compared with state-of-the-art metal oxide catalysts under moderate overpotentials and in a remarkably large pH range, including acid media where most cost-effective water oxidation catalysts are not useful. The origin of the superior electrocatalytic activity toward water oxidation appears to be in the optimized interfacial matching between catalyst and electrode surface obtained through this fabrication method.
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