Single-Atom Co-Decorated MoS2 Nanosheets Assembled on Metal Nitride Nanorod Arrays as an Efficient Bifunctional Electrocatalyst for pH-Universal Water Splitting |
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Authors: | Thi Luu Luyen Doan Dinh Chuong Nguyen Sampath Prabhakaran Do Hwan Kim Duy Thanh Tran Nam Hoon Kim Joong Hee Lee |
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Affiliation: | 1. Department of Nano Convergence Engineering, Jeonbuk National University, Jeonju, Jeonbuk, 54896 Republic of Korea;2. Division of Science Education, Graduate School of Department of Energy Storage/Conversion Engineering, Jeonbuk National University, Jeonju, Jeonbuk, 54896 Republic of Korea |
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Abstract: | The commercialization of electrochemical water splitting technology requires electrocatalysts that are cost-effective, highly efficient, and stable. Herein, an advanced bifunctional electrocatalyst based on single-atom Co-decorated MoS2 nanosheets grown on 3D titanium nitride (TiN) nanorod arrays (CoSAs-MoS2/TiN NRs) has been developed for overall water splitting in pH-universal electrolytes. When applied as a self-standing cathodic electrode, the CoSAs-MoS2/TiN NRs requires overpotentials of 187.5, 131.9, and 203.4 mV to reach a HER current density of 10 mA cm–2 in acidic, alkaline, and neutral conditions, respectively, which are superior to the most previously reported non-noble metal HER electrocatalysts at the same current density. The CoSAs-MoS2/TiN NRs anodic electrode also shows low OER overpotentials of 454.9, 340.6, and 508.0 mV, respectively, at a current density of 10 mA cm–2 in acidic, alkaline, and neutral mediums, markedly outperforming current OER catalysts reported elsewhere. More importantly, an electrolyzer delivered from the cathodic and anodic CoSAs-MoS2/TiN NRs electrodes exhibits an extraordinary overall water splitting performance with good stability and durability in pH-universal conditions. |
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Keywords: | bifunctional catalyst core/shell structure pH-universal electrolytes single-atom Co water splitting |
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