Journal
MATERIALS RESEARCH EXPRESS
Volume 8, Issue 9, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1591/ac2287
Keywords
current density; electrocatalyst; nickel phosphide; onset potential; urea oxidation; kinetics
Categories
Funding
- Ministry of Science and Higher Education, Ethiopia
- IoE grant [R(VI)090/23/2019-20 356]
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The study focused on modifying conventional nickel phosphide by cobalt doping and dispersing the prepared cobalt nickel phosphide on poly (aniline-co-pyrrole)/reduced graphene oxide to improve the kinetics and stability of direct urea fuel cells. The synthesized catalysts showed superior electrocatalytic performance, indicating potential commercial applications.
Efficient and low-cost materials are highly demanded to improve the sluggish kinetics and stability of direct urea fuel cells for large-scale commercialization. In this study, modification of conventional nickel phoaphide (NiP) by cobalt doping via the facile solvothermal method and simultaneously dispersing prepared cobalt nickel phosphide (CoNiP) on poly (aniline-co-pyrrole)/reduced graphene oxide (PPy@PANI/rGO) as efficient and low-cost support material via simple ultrasonic/heat mediated dispersion process. The synthesized catalysts were characterized by scanning electron microscopy and an x-ray diffractometer. Furthermore, Cyclic Voltammetry tests were conducted to evaluate the performance of synthesized catalysis towards alkaline urea oxidation. The physical characterization depicts the successful formation of NiP and Co-doped NiP microsphere with a particle size of 4.306 mu m and 2.04 mu m, respectively. In addition, homogeneous distribution of the CoNiP microsphere in the structure of PPy@PANI/rGO support material was achieved. Based on the CV test, the superior electrocatalytic performance of CoNiP@PPy@PANI/rGO electrode material with a potential of 0.414V versus SCE to drive a high current density of 26.92 mAcm(-2), lower onset potential of 0.204 V versus SCE, and higher electrochemically active surface area of 2.08 x 10(-1) cm(2)mg(-1) were achieved. Furthermore, the electrochemical activities, kinetics, and stability of CoNiP@PPy@PANI/rGO remarkably outperformed the commercial NiP and CoNiP towards alkaline urea electro-oxidation. Therefore, a novel material, CoNiP@PPy@PANI/rGO, is an excellent candidate for anode electrode material in direct urea fuel cells.
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