期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 680, 期 -, 页码 146-154出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.04.084
关键词
Microwave-hydrothermal; Nanosheets; Nanorods; Oxygen evolution reaction
资金
- National Natural Science Foundations of China [51275417, 51521061]
- 111 Project [B08040]
Rod-like, mixed rod-like and sheet-like, and sheet-like cobalt oxide (Co3O4) nanostructures were synthesized by a two-step process of microwave-hydrothermal and calcination using cobalt hydroxide carbonate as precursor, whose morphology could be controlled by adjusting the urea concentration in microwave-hydrothermal. With the increasing urea concentration, the cobalt hydroxide carbonate precursors transformed from rods to sheets, and their crystal structures changed from orthorhombic to monoclinic. After the calcination process, the cobalt hydroxide carbonate converted to Co3O4 without obvious change of their morphology. Meanwhile, a large number of mesopores appeared in the Co3O4 nanostructures. Of the three morphologies, analysis of catalytic activity for oxygen evolution reaction (OER) demonstrated that the Co3O4 nanosheets exhibited highest current density and lowest over potential. The superior electrochemical performance of Co3O4 nanosheets might be attributed to their high surface areas and porous structure, which could efficiently accelerate electron transport and improve the catalytic activity for OER in alkaline solution. (C) 2016 Elsevier B.V. All rights reserved.
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