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Title: Insight into the synergistic effect between nickel and tungsten carbide for catalyzing urea electrooxidation in alkaline electrolyte

Tungsten carbide modified nickel (Ni-WC/C) catalyst is synthesized through the sequential impregnation method and evaluated for the electrooxidation of urea in alkaline electrolyte. Both the activity and stability of Ni are enhanced by the introduction of WC. In situ Fourier transform infrared (FTIR) measurements combined with electrochemical analysis were used to provide a better understanding of the mechanism for urea electrooxidation on the Ni-based catalysts. The formation of CO 2 and NCO species is detected during urea oxidation, and the synergistic effect resulting from the interaction of Ni and WC is also proposed. The Ni-WC/C electrode contributes to the improved C–N bond cleavage in urea than that on Ni/C, resulting in a higher activity. Furthermore, the introduction of WC also enhances the anti-poisoning ability, thus promoting more complete oxidation of urea to produce CO 2, which leads to a higher energy conversion efficiency than that on Ni/C. In conclusion, this work provides a new strategy for designing highly efficient catalysts for urea electrooxidation.
 [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [1] ; ORCiD logo [5]
  1. Xi'an Jiaotong Univ., Xi'an (People's Republic of China)
  2. The Hong Kong Univ. of Science and Technology, Hong Kong (People's Republic of China)
  3. Columbia Univ., New York, NY (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States)
  5. Columbia Univ., New York, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 0926-3373
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Applied Catalysis. B, Environmental
Additional Journal Information:
Journal Volume: 232; Journal Issue: C; Journal ID: ISSN 0926-3373
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; Urea electrooxidation; Tungsten carbides; In situ FTIR; C-N bond
OSTI Identifier: