journal article·2022-04-06

Reduction of Transition-Metal Columbite-Tantalite as a Highly Efficient Electrocatalyst for Water Splitting

Patrick M. Bacirhonde, Nelson Y. Dzade, Carmen Chalony, Jeesoo Park, Eun-Suk Jeong, Emmanuel O. Afranie, Sunny Lee, Cheol Sang Kim, Do-Hwan Kim, Chan Hee Park

ACS Applied Materials & Interfaces· Volume 14· Issue 13
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Abstract

We successfully report a liquid–liquid chemical reduction and hydrothermal synthesis of a highly stable columbite-tantalite electrocatalyst with remarkable hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performance in acidic media. The reduced Fe0.79Mn0.21Nb0.16Ta0.84O6 (CTr) electrocatalyst shows a low overpotential of 84.23 mV at 10 mA cm–2 and 103.7 achieved at 20 mA cm–2 current density in situ for the HER and OER, respectively. The electrocatalyst also exhibited low Tafel slopes of 104.97 mV/dec for the HER and 57.67 mV/dec for the OER, verifying their rapid catalytic kinetics. The electrolyzer maintained a cell voltage of 1.5 V and potential–time stability close to that of Pt/C and RuO2. Complementary first-principles density functional theory calculations identify the Mn sites as most active sites on the Fe0.75Mn0.25Ta1.875Nb0.125O6 (100) surface, predicting a moderate Gibbs free energy of hydrogen adsorption (ΔGH* ≈ 0.08 eV) and a low overpotential of η = 0.47 V. The |ΔGMnH*| = 0.08 eV on the Fe0.75Mn0.25Ta1.875Nb0.125O6 (100) surface is similar to that of the well-known and highly efficient Pt catalyst (|ΔGPtH*| ≈ 0.09 eV).
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Research context

OpenAlex topics: Electrocatalysts for Energy Conversion · Electrochemical Analysis and Applications · Advanced battery technologies research

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Affiliations

Department of Bionanosystem Engineering, Jeonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea

Department of Bionanotechnology and Bioconvergence Engineering, Graduate School, Jeonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea

Department of Geology and Mining Exploration, University of Goma, 204 Goma, Democratic Republic of Congo

School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, Wales CF10 3AT, U.K.

Department of Energy and Mineral Engineering, Pennsylvania State University, University Park, State College, Pennsylvania 16802, United States

Division of Science Education and Institute of Fusion Science, Jeonbuk National University, Jeonju, Jeonbuk 54896 Republic of Korea

Department of Materials Science and Engineering, Chungnam National University, 99 Daehang-no, Yuseong-gu, Daejeon 305-764, Republic of Korea

Division of Mechanical Design Engineering, Jeonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea

Department of Energy Storage/Conversion Engineering of Graduate School, Jeonbuk National University, Jeonju, Jeollabuk-do 54896, Republic of Korea

Funding

Engineering and Physical Sciences Research Council · National Research Foundation of Korea · Pennsylvania State University · College of Earth and Minerals Sciences

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