Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 138, Issue 49, Pages 16037-16045Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.6b09778
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Funding
- European Union [279313]
- Spanish Ministerio de Economia y Competitividad (MINECO) [CTQ2015-71287-R, MAT2014-59961-C2-2-R]
- Severo Ochoa Excellence Accreditations [SEV-2013-0319, SEV-2013-0295]
- Generalitat de Catalunya [2014-SGR-797, 2014-SGR-1638]
- ICIQ foundation
- Marie Curie COFUND Action from the European Commission
- MINECO
- La Caixa Foundation
- ICREA Funding Source: Custom
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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)center dot nH(2)O 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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