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Download fileElectrodeposition of Unary Oxide on a Bimetallic Hydroxide as a Highly Active and Stable Catalyst for Water Oxidation
journal contribution
posted on 06.09.2019, 12:37 authored by Ranjith Bose, K. Karuppasamy, Hashikaa Rajan, Dhinesh Babu Velusamy, Hyun-Seok Kim, Akram AlfantaziFor industrial-scale water electrolysis, development
of a highly stable and active oxygen evolution reaction (OER) electrocatalyst
is highly demanded. In this study, we report an efficient OER electrocatalyst of
CeOx (unary oxide) and NiFe-OH (bimetallic
hydroxide) electrochemically deposited on a macroporous nickel foam
substrate. The synthesized electrocatalyst exhibits remarkably improved
OER performance by reaching a current density of 100 mA cm–2 at a low overpotential of 280 mV, which is quite superior to that
of most of the previously reported non-noble-metal-based OER electrocatalysts.
Furthermore, the developed catalyst demonstrated a minor Tafel slope
of 43.2 mV dec–1 with good stability under a large
current at a continuous operation of 80 000 s in a strong alkaline
electrolyte. Experimental observations revealed that the combination
of CeOx and NiFe-OH accelerates the electroadsorption
energies between the electrocatalyst surface and oxygen intermediates,
considerably contributing to the OER enhancement. These results undoubtedly
represent an important milestone toward the development of efficient
OER electrocatalysts for applications as industrial water electrolyzers.