Journal
APPLIED SURFACE SCIENCE
Volume 560, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2021.150009
Keywords
Urea oxidation; CuO-Ni(OH)2; Electrocatalyst; Hydrogen production; Electro-oxidation
Categories
Funding
- National Natural Science Foundation of China [21706241, U1404503, 21403053]
- China Postdoctoral Science Foundation [2020M672305, 2018M642791]
- Key Scientific and Technological Project of Henan Province [202102210042]
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The study presents a controllable synthetic strategy for CuO-Ni(OH)2-d nanosheets, which exhibit excellent activity and stability in urea electrooxidation reactions. CuO-Ni(OH)2-d also shows higher current density compared to commercial catalysts.
The electrooxidation of urea is identified as a prospective route for the degradation of urea-rich wastewater and hydrogen generation. Here, we report a controllable synthetic strategy to develop CuO-Ni(OH)2-d nanosheets by deliberately selecting S2O32-as the coordinating etchant toward to Cu2O template and optimize the reaction conditions. The CuO-Ni(OH)2-d is composed of CuO quadrangle nanosheets (100-200 nm) dispersed with Ni (OH)2 nanoparticles. As predicted, The CuO-Ni(OH)2-d nanosheets catalysts exhibit high UOR activities at 1.41 V vs. RHE to achieve the current density of 10 mA cm-2 under the condition of 1 M KOH with 0.33 M urea. The CuO-Ni(OH)2-d nanosheets catalyst also emerges a higher current density of 21.5 mA cm-2, which is about 5.3, 6.8, 30, and 2 times larger than those of commercial Ni(OH)2, CuO-Ni(OH)2-a, CuO-Ni(OH)2-b and CuO-Ni(OH)2c at 1.52 V vs. RHE, respectively. In particular, the CuO-Ni(OH)2-d nanosheets catalysts exhibited the best catalytic stability performance. After the 36 h I-T test, the current density has no noticeable decreasing compared with the initial current density. This work could present a strategy for the design of advanced electrode materials that can be further applied in urea-rich wastewater remediation.
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