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Engineering of a highly stable metal-organic Co-film for efficient electrocatalytic water oxidation in acidic media

Journal article
Authors H. A. Younus
M. Vandichel
N. Ahmad
Elisabet Ahlberg
M. Busch
F. Verpoort
Published in Materials Today Energy
Volume 17
Pages 1-9
Publication year 2020
Published at Department of Chemistry and Molecular Biology
Pages 1-9
Language en
Links https://doi.org/10.1016/j.mtener.20...
Keywords DFT, Electrocatalysts, Molecular catalysts, Organometallic film, Oxygen evolution reaction (OER), Water splitting
Subject categories Materials Chemistry, Theoretical Chemistry, Electrochemistry

Abstract

© 2020 Elsevier Ltd Water oxidation is traditionally performed over IrO2 and RuO2 owing to their high stability at low pH compared to molecular O2 evolution catalysts. The low stability of molecular complexes in acids limits their industrial exploitation as anodes in water-splitting devices, where high current densities and proton conductivity are required. Herein, an existing Co(1,10-phenanthroline)2 complex film is engineered to improve its pH-stability via extra OH substituents on the ligand, i.e. 1,10-phenanthroline-4,7-diol. This novel Co(1,10-phenanthroline-4,7-diol)2 complex film is active for water oxidation at low overpotentials and stable at low pH. Since the calculated water oxidation overpotentials of both complexes are similar, the difference in water oxidation activity is attributed to a smaller charge transfer resistance, which originates from a different anchoring style to the electrode via the OH groups of the ligand. This result is supported by electrochemical impedance measurements. The high pH-stability of the Co(1,10-phenanthroline-4,7-diol)2 film is computationally rationalized by a high crystal formation energy observed in DFT calculations. In summary, an acid-stable and active cobalt-based metal-organic film is reported that competes well with most reported earth-abundant catalysts for water oxidation under similar conditions.

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