Nickel-iron borate coated nickel-iron boride hybrid for highly stable and active oxygen evolution electrocatalysis |
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| Affiliation: | 1. College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China;2. Department of Orthopaedic Surgery, Renmin Hospital of Wuhan University, Wuhan 430060, China;3. Suzhou Institute of Wuhan University, Suzhou 215123, China;1. State Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China;2. Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, China;1. Department of Physics and National Centre for Nanosciences & Nanotechnology, University of Mumbai, Vidyanagari, Santacruz (E), Mumbai 400098, India;2. Dipartimento di Fisica, Università degli Studi di Trento, I-38123 Povo (Trento), Italy;1. State Key Laboratory of Fine Chemicals, DUT-KTH Joint Education and Research Centre on Molecular Devices, Dalian University of Technology (DUT), Dalian 116024, China;2. National Synchrotron Radiation Laboratory, University of Science and Technology of China (USTC), Hefei 230029, China;3. Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China (USTC), Hefei 230026, China;4. Department of Chemistry, KTH Royal Institute of Technology, Stockholm 10044, Sweden;1. Department of Materials Chemistry, Huzhou University, Huzhou 313000, China;2. State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;3. Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin 300071, China |
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| Abstract: | The development of efficient and cost-effective electrocatalysts toward anodic oxygen evolution reaction (OER) is crucial for the commercial application of electrochemical water splitting. As the most promising electrocatalysts, the OER performances of nickel-iron-based materials can be further improved by introducing metalloid elements to modify their electron structures. Herein, we developed an efficient hybrid electrocatalyst with nickel-iron boride (NiFeB) as core and amorphous nickel-iron borate (NiFeBi) as shell (NiFeB@NiFeBi) via a simple aqueous reduction. The obtained NiFeB@NiFeBi exhibits a small overpotential of 237 mV at 10 mA/cm2 and Tafel slope of 57.65 mV/dec in 1.0 mol/L KOH, outperforming most of the documented precious-metal-free based electrocatalysts. Benefiting from the in situ formed amorphous NiFeBi layer, it shows excellent stability toward the oxygen evolution reaction (OER). These findings might provide a new way to design advanced precious-metal-free electrocatalysts for OER and the application of electrochemical water splitting. |
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| Keywords: | Oxygen evolution reaction Metal boride Metal borate Core-shell |
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