Abstract
In order to develop non-PGM anode electrocatalyst for proton exchange membrane water electrolysis, the catalytic activity of Ta oxide-based electrocatalyst with and without Mn addition for the oxygen evolution reaction (OER) have been investigated. Analyzing XPS spectra of Ta oxide-based electrocatalyst film with Mn addition (Mn-TaOx), Mn oxide was contained before electrochemical measurement, but it was almost disappeared after electrochemical measurement. Mn-TaOx after electrochemical measurement was mainly consisted of Ta2O5. According to results from electrochemical measurement, Ta oxide-based electrocatalyst film with Mn addition (Mn-TaOx) has increased geometric current density (i geo) than that without any addition (TaOx). Especially, some polarization curves of Mn-TaOx have redox peak of Mn(III)/Mn(IV). There is linear relation between the i geo for the OER and the electric charge (Q) of redox peak of Mn species. It is suggested that Mn species including in Mn-TaOx whose containing amount was below detection limit of XPS measurement enhances the catalytic activity of TaOx for the OER. In addition, Ta oxide-based electrocatalyst film with Mn addition (Mn-TaOx) has also much larger i geo than Ti oxide based electrocatalyst with Mo addition (Mo-TiOx) as our past results. Since the charge transfer resistance (R ct) and slope of Mott-shottky plots of Mn-TaOx were smaller than that of Mo-TiOx, the reason why the Mn-TaOx has much larger i geo than Mo-TiOx is that Mn-TaOx was improved by both effects on the catalytic activity and the electric conductivity compared with that at Mo-TiOx.
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