期刊
DALTON TRANSACTIONS
卷 50, 期 46, 页码 17265-17274出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1dt03048e
关键词
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资金
- National Natural Science Foundation of China [21771095, 21571092]
- Natural Science Foundation of Shandong Province [ZR2017JL013]
- Youth Innovation Team of Shandong Colleges and Universities [2019KJC027]
The study designed a hierarchical Fe3O4@MnOx nano-composite with improved electrocatalytic performance and overall water splitting efficiency by introducing a pH-regulated redox reaction.
Electrochemical water splitting is convinced as one of the most promising solutions to combat the energy crisis. The exploitation of efficient hydrogen and oxygen evolution reaction (HER/OER) bifunctional electrocatalysts is undoubtedly a vital spark yet challenging for imperative green sustainable energy. Herein, through introducing a simple pH regulated redox reaction into a tractable hydrothermal procedure, a hierarchical Fe3O4@MnOx binary metal oxide core-shell nano-polyhedron was designed by evolving MnOx wrapped Fe3O4. The MnOx effectively prevents the agglomeration and surface oxidation of Fe3O4 nano-particles and increases the electrochemically active sites. Benefiting from the generous active sites and synergistic effects of Fe3O4 and MnOx, the Fe3O4@MnOx-NF nanocomposite implements efficient HER/OER bifunctional electrocatalytic performance and overall water splitting. As a result, hierarchical Fe3O4@MnOx only requires a low HER/OER overpotential of 242/188 mV to deliver 10 mA cm(-2), a small Tafel slope of 116.4/77.6 mV dec(-1), combining a long-term cyclability of 5 h. Impressively, by applying Fe3O4@MnOx as an independent cathode and anode, the overall water splitting cell supplies a competitive voltage of 1.64 V to achieve 10 mA cm(-2) and super long cyclability of 80 h. These results reveal that this material is a promising candidate for practical water electrolysis application.
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