ACS Appl Mater Interfaces
Department of Materials Science and Technology, Faculty of Engineering, Niigata University, 8050 Ikarashi-2, Niigata 950-2181, Japan.
Published: October 2017
A heterogeneous catalyst incorporating an inorganic ion cofactor for electrochemical water oxidation was exploited using a CoO(OH) nanoparticle layer-deposited electrode. The significant catalytic current for water oxidation was generated in a NaBO solution at pH 9.4 when applying 0.94 V versus Ag/AgCl in contrast to no catalytic current generation in the KSO solution at the same pH. HBO and BO ions were indicated to act as key cofactors for the induced catalytic activity of the CoO(OH) layer. The NaBO concentration dependence of the catalytic current was analyzed based on a Michaelis-Menten-type kinetics to provide an affinity constant of cofactors to the active sites, K = 28 ± 3.6 mM, and the maximum catalytic current density, I = 2.3 ± 0.13 mA cm. The I value of HBO and BO ions was 1.4 times higher than that (1.3 mA cm) for the previously reported case of CO ions. This could be explained by the shorter-range proton transfer from the active site to the proton-accepting cofactor because of the larger size and more flexible conformation of HBO and BO ions compared with that of CO ions.
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http://dx.doi.org/10.1021/acsami.7b13817 | DOI Listing |
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