期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 613, 期 -, 页码 806-813出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.01.081
关键词
Heterogeneous nanostructure; Overall water splitting; Hydrogen evolution reaction; Oxygen evolution reaction
资金
- National Natural Science Foundation of China [21805124]
A hierarchical Co3S4/CeO2 nanorod array on cobalt foam (Co3S4/CeO2-CF) was successfully fabricated via a one-step hydrothermal method. The CeO2 nanorod was fully covered by Co3S4 nanosheets, creating a hierarchical core-shell nanostructure. The Co3S4/CeO2 nanostructure, formed through doping of CeO2 and Co3S4 during the hydrothermal process, exhibits reduced free energy barrier in OER process. The Co3S4/CeO2-CF catalyst shows excellent catalytic activity for overall water splitting and remarkable stability, promising potential for bifunctional electrocatalysis.
Herein, a hierarchical Co3S4/CeO2 nanorod array on cobalt foam (Co3S4/CeO2-CF) was successfully constructed via a facile one-step hydrothermal method. The fabrication of Co3S4/CeO2-CF was confirmed by X-ray diffraction, scanning electron microscope (SEM), high resolution transmission electron microscope (HRTEM). It is observed that CeO2 nanorod was fully covered with Co3S4 nanosheets, forming a hierarchical core-shell nanostructure. Furthermore, CeO2 and Co3S4 were doped with each other during the one-step hydrothermal process, forming a heterogeneous Co3S4/CeO2 nanostructure. Density functional theory (DFT) calculations suggest that the introduction of CeO2 in Co3S4 is effective in reducing the free energy barrier of OER process. To achieve current density of 10 mA cm-2, only small overpotentials of 74.9 mV and 213 mV are required for HER and OER in 1.0 M KOH solution, respectively. In particular, the Co3S4/CeO2-CF based electrolysis cell for overall water splitting only needs an output voltage of 1.64 V in the alkaline medium, lower than that of Pt/C-RuO2-based electrolysis cells (1.70 V). Such hierarchical heterogeneous catalyst also shows ultra-stable catalytic activity. Therefore, with the favorable heterointerfaces and hierarchical structures, Co3S4/CeO2-CF could be a promising bifunctional electrocatalyst for overall water splitting and this study may also provide a facile method for the preparation of hierarchical heterogeneous nanostructured materials. (c) 2022 Elsevier Inc. All rights reserved.
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