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Interlayer Effect in NiCo Layered Double Hydroxide for Promoted Electrocatalytic Urea Oxidation
- Zeng, Min, Wu, Jinghua, Li, Zhiyun, Wu, Haihong, Wang, Jinling, Wang, Hualin, He, Lin, Yang, Xuejing
- ACS sustainable chemistry & engineering 2019 v.7 no.5 pp. 4777-4783
- catalysts, cathodes, durability, electrolysis, energy, energy recovery, fuel cells, hydrogen, nitrates, oxidation, remediation, urea, urine, wastewater
- Urea electrolysis is a promising route to utilize urea-rich wastewater as an energy source to produce hydrogen on the cathode or generate electricity through a direct urea fuel cell, which offers great potential for simultaneous water remediation and energy recovery. Here, we report a scalable synthetic strategy to prepare NiCo layer double hydroxide (NiCo LDH) as an efficient catalyst for urea electrooxidation. NiCo LDH with NO₃– intercalant exhibited the best electrocatalytic performance and selectivity toward urea oxidation with a low onset potential, high faradaic efficiency, and high durability. The interlayer spacing in the LDH structure was found to play a pivotal role in the urea oxidation electrocatalysis with higher activity/selectivity under larger spacings. Further analysis of the urea oxidation product could potentially enable selective urine treatment into environmentalally friendly products.