Structural engineering of hierarchically hetestructured Mo2C/Co conformally embedded in carbon for efficient water splitting |
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| Affiliation: | 1. The State Key Laboratory of Refractories and Metallurgy and Institute of Advanced Materials and Nanotechnology, Wuhan University of Science and Technology, Wuhan 430081, China;2. College of Resources and Environment Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;3. Department of Physics, Department of Materials Science and Engineering, And Department of Biomedical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China;1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266580, PR China;2. College of Science, China University of Petroleum (East China), Qingdao 266580, PR China;1. College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325000, China;2. School of Materials and Energy, Guangdong University of Technology, Guangzhou, Guangdong, 510006, China;3. Chimie du Solide et de l''énergie-Collège de France 11 Place Marcelin Berthelot, Paris, 75005, France;4. School of Materials Science and Engineering, Anhui University of Technology, Maanshan, 243002, China;5. Research Center of Applied Solid State Chemistry, Ningbo University, Ningbo, 315211, China;1. School of Information Engineering, Gannan Medical University, Ganzhou, 341000, PR China;2. First Affiliated Hospital of Gannan Medical University, Ganzhou, 341000, PR China;3. School of Chemistry and Bio-engineering, Yichun University, Yichun, 336000, PR China;4. School of Materials Science and Energy Engineering, Foshan University, Foshan, 528000, PR China |
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| Abstract: | Developing low-cost and high efficient electrocatalysts for both oxygen and hydrogen evolution reaction in an alkaline electrolyte toward overall water splitting is still a significant challenge. Here, a novel hierarchically heterostructured catalyst composed of ultrasmall Mo2C and metallic Co nanoparticles confined within a carbon layer is produced by a facile phase separation strategy. During thermal reduction of CoMoO4 nanosheets in CO ambient, in-situ generated nanoscale Co and ultrafine Mo2C conformally encapsulated in a conductive carbon layer. In addition, some carbon nanotubes catalyzed by Co nanoparticles vertically grew on its surface, creating 3D interconnected electron channels. More importantly, the integrated C@Mo2C/Co nanosheets assembled into the hierarchical architecture, providing abundant active surface and retaining the structural integrity. Benefiting from such unique structure, the constructed hierarchical heterostructure shows low overpotentials of 280 mV and 145 mV to reach a current density of 10 mA cm−2 for OER and HER in an alkaline electrolyte. Furthermore, the symmetrical electrolyzer assembled with catalyst exhibits a small cell voltage of 1.67 V at 10 mA cm−2 in addition to outstanding durability, demonstrating the great potential as a high efficient bifunctional electrocatalyst for overall water splitting. |
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| Keywords: | Overall water-splitting Bifunctional electrocatalyst Cobalt Molybdenum carbide Coupling effect |
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