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Bacirhonde PM, Dzade NY, Chalony C, Park J, Jeong ES, Afranie EO, Lee S, Kim CS, Kim DH, Park CH. Reduction of Transition-Metal Columbite-Tantalite as a Highly Efficient Electrocatalyst for Water Splitting. ACS APPLIED MATERIALS & INTERFACES 2022; 14:15090-15102. [PMID: 35324159 DOI: 10.1021/acsami.1c21742] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
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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Affiliation(s)
- Patrick M Bacirhonde
- 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
| | - Nelson Y Dzade
- 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
| | - Carmen Chalony
- 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
| | - Jeesoo Park
- 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
| | - Eun-Suk Jeong
- Division of Science Education and Institute of Fusion Science, Jeonbuk National University, Jeonju, Jeonbuk 54896 Republic of Korea
| | - Emmanuel O Afranie
- Department of Materials Science and Engineering, Chungnam National University, 99 Daehang-no, Yuseong-gu, Daejeon 305-764, Republic of Korea
| | - Sunny Lee
- 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
| | - Cheol Sang Kim
- Department of Bionanotechnology and Bioconvergence Engineering, Graduate School, Jeonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea
- Division of Mechanical Design Engineering, Jeonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea
| | - Do-Hwan Kim
- Division of Science Education and Institute of Fusion Science, Jeonbuk National University, Jeonju, Jeonbuk 54896 Republic of Korea
- Department of Energy Storage/Conversion Engineering of Graduate School, Jeonbuk National University, Jeonju, Jeollabuk-do 54896, Republic of Korea
| | - Chan Hee Park
- Department of Bionanotechnology and Bioconvergence Engineering, Graduate School, Jeonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea
- Division of Mechanical Design Engineering, Jeonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea
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Vishwakarma AK, Jha K, Jayasimhadri M, Sivaiah B, Gahtori B, Haranath D. Emerging cool white light emission from Dy3+ doped single phase alkaline earth niobate phosphors for indoor lighting applications. Dalton Trans 2015; 44:17166-74. [DOI: 10.1039/c5dt02436f] [Citation(s) in RCA: 123] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Single-phase cool white-light emitting BaNb2O6:Dy3+ phosphors have been synthesized and their structural, luminescence and colorimetric properties have been investigated in detail.
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Affiliation(s)
- Amit K. Vishwakarma
- Luminescent Materials Research Lab
- Department of Applied Physics
- Delhi Technological University
- Delhi 110 042
- India
| | - Kaushal Jha
- Luminescent Materials Research Lab
- Department of Applied Physics
- Delhi Technological University
- Delhi 110 042
- India
| | - M. Jayasimhadri
- Luminescent Materials Research Lab
- Department of Applied Physics
- Delhi Technological University
- Delhi 110 042
- India
| | - B. Sivaiah
- Luminescent Materials Research Lab
- Department of Applied Physics
- Delhi Technological University
- Delhi 110 042
- India
| | - Bhasker Gahtori
- Luminescent Materials Research Lab
- Department of Applied Physics
- Delhi Technological University
- Delhi 110 042
- India
| | - D. Haranath
- CSIR-National Physical Laboratory
- New Delhi 110 012
- India
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