An efficient tri-metallic anodic electrocatalyst for urea electro-oxidation
- Authors
- Basumatary P.; Lee, Un Ho; Konwar D.; Yoon, Young Soo
- Issue Date
- Nov-2020
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Electro-oxidation; Nanoparticles; Power density; Tri-metallic alloy; Urea
- Citation
- International Journal of Hydrogen Energy, v.45, no.57, pp.32770 - 32779
- Journal Title
- International Journal of Hydrogen Energy
- Volume
- 45
- Number
- 57
- Start Page
- 32770
- End Page
- 32779
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/79194
- DOI
- 10.1016/j.ijhydene.2020.04.223
- ISSN
- 0360-3199
- Abstract
- Tri-metallic MnNiFe alloy nanoparticles with four different Mn:Ni:Fe weight ratios (0.5:2.0:0.5, 0.5:1.0:0.5, 1.0:1.0:1.0, and 2.0:0.5:2.0) on reduced graphene oxide (rGO) supports were synthesized using a one-pot hydrothermal method. The as-prepared catalysts were characterized by X-ray diffraction, inductively coupled plasma-mass spectroscopy, Brunauer-Emmett-Teller analysis, scanning electron microscopy, and transmission electron microscopy, and their catalytic activities were measured by cyclic voltammetry and chronoamperometry. In urea electro-oxidation, the Mn0.5Ni2.0Fe0.5/rGO catalyst exhibited superior electrocatalytic activity compared to Ni/rGO and commercial Ni/C. The Mn0.5Ni2.0Fe0.5/rGO catalyst exhibited a mass activity of 1753.97 mA mg−1 Ni, along with an onset potential of 0.34 V (vs. Ag/AgCl) in 1.0 M KOH and 0.33 M urea solution, which is ~4.2 times and 9.8 times higher than those of Ni/rGO and commercial Ni/C, respectively. Furthermore, a single cell comprising of Mn0.5Ni2.0Fe0.5/rGO catalyst exhibited a peak power density of 30.08 mW cm−2 in 0.33 M urea and 1.0 M KOH at 50 °C. © 2020 Hydrogen Energy Publications LLC
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