Journal
JOURNAL OF APPLIED ELECTROCHEMISTRY
Volume 47, Issue 3, Pages 295-304Publisher
SPRINGER
DOI: 10.1007/s10800-016-1040-3
Keywords
Oxygen evolution reaction; Cobalt spinel; Roughness factor; Water splitting; Mesoporosity
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Funding
- Italian Republic (Ministry of Foreign Affairs)
- Republic of Poland (Ministry of Science and Higher Education)
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In this work, a series of Co3O4 spinels were produced by different synthesis routes (precipitation, solution combustion synthesis, and hard template method), and were used as non-noble catalysts for the oxygen evolution reaction (OER) under basic conditions. The investigated catalysts have a proportional relation between electrochemical activity, surface roughness, and specific surface area. The hard template synthesis method resulted in the most active catalyst compared in this work, which we ascribe to its highly porous structure, and concomitant Co3+/Co4+ redox couple at a lower potential, attributed to the OER. The most performant catalyst was compared with a commercial catalyst (Ni@NiO, Alfa Aesar) showing only 0.01 V overpotential difference, evaluated at 10 mA cm(- 2) (overpotential 0.44 V).
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