Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 245, Issue -, Pages 1-9Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2018.12.036
Keywords
Prussian blue analogous; Liquid phase epitaxial growth; CoFe2O4 thin film; Oxygen evolution reaction
Funding
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
- National Natural Science Foundation of China [21872148, 21425102, 21601189, 21473202, 21521061]
- Youth Innovation Promotion Association of Chinese Academy of Sciences [2018339]
- Natural Science Foundation of Fujian Province [2016J01085]
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The development of cost-effective, high-efficiency, and non-noble metal based electrocatalysts for oxygen evolution reaction (OER) is considered to be the most pivotal portion for electrochemical water splitting to generate renewable energy. Herein, well-aligned mesoporous CoFe2O4 thin film is first developed from surface epitaxial growth of oriented CoFe-based Prussian blue analogue thin film (CoFe-PBA thin film) for efficient electrocatalytic OER. CoFe-PBA thin film with preferred [100] orientation is first prepared on the substrate surface by employing liquid phase epitaxial method without any structure-directing surfactants. After thermal pyrolysis, such CoFe-PBA thin film was transformed into well-aligned mesoporous CoFe2O4 thin film. Interestingly, the self-support CoFe3O4 thin film electrode with the mass loading of 1.6 mg cm-2 delivers an oxygen evolution current density of 10 mA cm-2 at an overpotential of 266 mV and exhibits durable stability in 1 M KOH aqueous solution. The remarkable and stable catalytic performance of the CoFe2O4 thin film can be mainly owing to the mesoporous structure of CoFe2O4, efficient charge/electron transfer, the numerous exposed active sites, and the well-structured configuration of the electrode. Hence, this work provides an effective paradigm for preparing binder-free, self-support, and low-cost spinel oxide electrocatalyst for efficient OER derived from surface epitaxial growth of oriented PBA thin film.
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