Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 5, Pages 4777-4783Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b04953
Keywords
NiCo layered double hydroxide (NiCo LDH); Urea electrooxidation; Interlayer effect
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Funding
- National Key Research and Development Program of China [2016YFC0204500]
- National Natural Science Foundation of China [21633013, 21703267, 21507030, 91834301]
- Foundation research project of Jiangsu Province [BK20171242, BK20170423]
- National Program for Thousand Young Talents of China
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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.
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