Affiliation:
1. Fujian Cross Strait Institute of Flexible Electronics (Future Technology) Fujian Normal University Fuzhou 350117 P. R. China
2. Jiangsu Key Laboratory of New Power Batteries and Jiangsu Key Laboratory of Biofunctional Materials School of Chemistry and Materials Science Nanjing Normal University Nanjing 210023 P. R. China
3. Hefei National Research Center for Physical Sciences at the Microscale University of Science & Technology of China Hefei 230026 P. R. China
4. State Key Laboratory of Coordination Chemistry Nanjing National Laboratory of Solid State Microstructures Nanjing University Nanjing 210093 P. R. China
Abstract
AbstractTransition metal phosphides (TMPs) and phosphates (TM‐Pis) nanostructures are promising functional materials for energy storage and conversion. Nonetheless, controllable synthesis of crystalline/amorphous heterogeneous TMPs/TM‐Pis nanohybrids or related nanoarchitectures remains challenging, and their electrocatalytic applications toward overall water splitting (OWS) are not fully explored. Herein, the Ni2P nanocrystals anchored on amorphous V‐Pi nanosheet based porous flower‐like nanohybrid architectures that are self‐supported on carbon cloth (CC) substrate (Ni2P/V‐Pi/CC) are fabricated by conformal oxidation and phosphorization of pre‐synthesized NiV‐LDH/CC. Due to the unique microstructures and strong synergistic effects of crystalline Ni2P and amorphous V‐Pi components, the obtained Ni2P/V‐Pi/CC owns abundant active sites, suitable surface/interface electronic structure and optimized adsorption‐desorption of reaction intermediates, resulting in outstanding electrocatalytic performances toward hydrogen and oxygen evolution reactions in alkaline media. Correspondingly, the assembled Ni2P/V‐Pi/CC||Ni2P/V‐Pi/CC electrolyzer only needs an ultralow cell voltage (1.44 V) to deliver 10 mA cm−2 water‐splitting currents, exceeding its counterparts, recently reported bifunctional catalysts‐based devices, and Pt/C/CC||IrO2/CC pairs. Moreover, the Ni2P/V‐Pi/CC||Ni2P/V‐Pi/CC manifests remarkable stability. Also, such device shows a certain prospect for OWS in acidic media. This work may spur the development of TMPs/TMPis‐based nanohybrid architectures by combining structure and phase engineering, and push their applications in OWS or other clean energy options.
Funder
National Natural Science Foundation of China
National Key Research and Development Program of China
Subject
General Materials Science,General Chemistry