Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 45, Issue 55, Pages 30559-30570Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2020.08.120
Keywords
CeO2; Metal phosphide; Interface engineering; Electrocatalysis; Water splitting
Categories
Funding
- National Natural Science Foundation of China [21601027, 21571028]
- Fundamental Research Funds for the Central Universities [DUT17RC(4)25, DUT18LK28]
- Open Funds of the State Key Laboratory of Rare Earth Resource Utilization in Changchun Institute of Applied Chemistry, Chinese Academy of Sciences [RERU2018020]
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The design and fabrication of highly active, robust and cost-efficient electrocatalysts for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is of great significance towards overall water splitting, but remains challenging as well. Herein, we report, for the first time, heterostructural Co/CeO2/Co2P/CoP@NC dodecahedrons as bifunctional electrocatalyst, in which abundant interfaces are formed between different components. Typical ZIF-67 (ZIF = zeolitic imidazolate framework) dodecahedrons with pre-inserted CeO2 nanowires were selected as precursors to synthesize Co/CeO2/Co2P/CoP@NC via a direct carbonization process followed by phosphidation, simultaneously generating the strong coupled heterojunction interfaces through interactions between CeO2 and CoxP species. Abundant porous structure leads to the exposure of more active sites and the carbon encapsulation of nanodomains sustains the high robustness and conductivity and the synergistic effect between the multi-components heterostructure. Benefiting from the above collective advantages, the Co/CeO2/Co2P/CoP@NC electrocatalysts exhibit small overpotentials of 307 and 195 mV to derive 10 mA cm(-2) for OER and HER, respectively. Furthermore, an alkaline electrolyzer assembled by using Co/CeO2/Co2P/CoP@NC as both cathode and anode can achieve a current density of 10 mA cm(-2) at a low voltage of 1.76 V and work continuously for over 15 h. This work would provide a rational protocol for fabrication multi-phase interface enriched electrocatalysts toward highly efficient energy conversion. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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