Enhanced activity and acid pH stability of prussian blue-type oxygen evolution electrocatalysts processed by chemical etching
| Autor: | Jordi Arbiol, Pengyi Tang, Bárbara Rodríguez-García, Álvaro Reyes-Carmona, Lijuan Han, Joan Ramon Morante, José Ramón Galán-Mascarós, Mabel Torréns |
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| Přispěvatelé: | Generalitat de Catalunya, Ministerio de Economía y Competitividad (España), European Commission, European Research Council, Institut Català d'Investigació Química, Fundación 'la Caixa' |
| Rok vydání: | 2016 |
| Předmět: |
Inorganic chemistry
Oxide chemistry.chemical_element 02 engineering and technology Acidic environment 010402 general chemistry Electrochemistry 01 natural sciences Biochemistry Oxygen Catalysis Artificial photosynthesis Electrode surfaces chemistry.chemical_compound Colloid and Surface Chemistry Catalytic performance Prussian blue Oxygen evolution General Chemistry Metal oxide catalysts 021001 nanoscience & nanotechnology Isotropic etching 0104 chemical sciences Structural studies chemistry Electrocatalytic activity 0210 nano-technology Water oxidation catalysts |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname Recercat. Dipósit de la Recerca de Catalunya Dipòsit Digital de Documents de la UAB Universitat Autònoma de Barcelona Recercat: Dipósit de la Recerca de Catalunya Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| ISSN: | 1520-5126 0002-7863 |
| Popis: | et al. 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)(CO)·nHO 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. This work was supported by the European Union (Project ERC StG Grant CHEMCOMP No. 279313); the Spanish Ministerio de Economia y Competitividad (MINECO) through Projects CTQ2015-71287-R, TNT-FUELS, and e-TNT (MAT2014-59961-C2-2-R) and the Severo Ochoa Excellence Accreditations 2014−2018, SEV-2013-0319 and SEV-2013-0295, the Generalitat de Catalunya (2014-SGR-797 and 2014-SGR1638), and the ICIQ foundation. A.R.C. thanks the Marie Curie COFUND Action from the European Commission for cofinancing his postdoctoral fellowship. L.H. thanks MINECO for her predoctoral fellowship. The research leading to these results has also received funding from “La Caixa” Foundation. |
| Databáze: | OpenAIRE |
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