Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 45, Issue 57, Pages 32770-32779Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2020.04.223
Keywords
Tri-metallic alloy; Nanoparticles; Electro-oxidation; Urea; Power density
Categories
Funding
- Advanced track for hydrogen production from renewable energy resources, hydrogen storage, and integrated system engineering technology of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korean Government of Ministry of Knowledge [20194030202440]
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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(Ni)(-1), along with an onset potential of 0.34 V (vs. Ag/AgC1) in 1.0 M KOH and 0.33 M urea solution, which is similar to 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 degrees C. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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