Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 259, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2019.118020
Keywords
Ultrathin nanosheets; Nickel hydroxide; Edge sites; Electrocatalysis; Urea oxidation
Funding
- National Natural Science Foundation of China [21675093, 41573103, 21422504, 21805149]
- Natural Science Foundation of Shandong Province of China [ZR2018BB012, 2015ZRBO1A0D]
- Taishan Scholar Program of Shandong Province of China [ts20110829]
- Key Research and Development Program of Shandong Province of China [2017GSF16105, 2018GGX102004]
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Ultrathin two-dimensional (2D) nanomaterials based on transition metal compounds can serve as alternative non-precious-metal electrocatalysts for urea oxidation reaction (UOR), which is vital to the development of direct urea fuel cells. Herein, we report a fast and room-temperature route to synthsize transition metal-based (Ni, Co, Mn) ultrathin 2D nanomaterials under ambient conditions. Theoretical and experimental studies demonstrate that the edges of Ni(OH)(2) are more active toward both the formation of NiOOH species and the adsorption of urea molecules than the basal planes, enabling accelerated catalytic kinetics for UOR. As expected, the beta-Ni(OH)(2) nanoflakes manifest considerable electrocatalytic activity toward urea oxidation, reflecting 5.7 times higher current density (142.4 mA cm(-2)) compared to the beta-Ni(OH)(2) nanosheets at a potential of 0.6 V vs Ag/AgCl. This work brings great promise for the design of advanced electrode materials in the field of electrocatalysis.
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