Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 45, Issue 38, Pages 19206-19213Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2020.05.052
Keywords
Urea electro-oxidation; Catalyst; Nickel cobalt binary metal; hydroxide; Nanosheet; Heterostructure
Categories
Funding
- foundation of the Fundamental Research Funds for the Central Universities [JUSRP11930]
- National Natural Science Foundation of China [21905116]
- Natural Science Foundation of Jiangsu Province [BK20190614]
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Urea oxidation is an important reaction for direct urea fuel cells as well as hydrogen production and/or water remediation via electrolysis using urea-rich wastewater. The key to efficient urea oxidation is to explore a well-designed high-performing catalyst. Herein, NiCo layered double hydroxide/hydroxide (NiCo LDH/NiCo(OH)(2)) microspheres composed of ultrasmall nanosheets have been grown on Ni foam by a solution method at room temperature. The NiCo LDH/NiCo(OH)(2) heterostructures have been confirmed by TEM and XRD analysis. The high activity with a small onset potential of 0.29 V vs. Hg/HgO is mainly attributed to the rich NiCo LDH-NiCo(OH)(2) interfaces and the bimetallic nature of the catalysts. The NiCo LDH/NiCo(OH)(2) heterostructures can be promising catalysts for urea oxidation and offer new insights into the design of high-performance nickel-based catalysts. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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