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Phase Diversity of Nickel Phosphides in Oxygen Reduction Catalysis

Title
Phase Diversity of Nickel Phosphides in Oxygen Reduction Catalysis
Authors
Razmjooei, FatemehPak, Chan HoYu, Jong-Sung
DGIST Authors
Yu, Jong-Sung
Issue Date
2018-07
Citation
ChemElectroChem, 5(14), 1985-1994
Type
Article
Article Type
Article
Keywords
Electrochemistrymaterials sciencenickel phosphideoxygen reductionphase variationNITROGEN-DOPED CARBONHYDROGEN EVOLUTION REACTIONEFFICIENT BIFUNCTIONAL ELECTROCATALYSTSMETAL-ORGANIC FRAMEWORKSLI-ION BATTERIESFUEL-CELLSIRON PHTHALOCYANINETHERMAL-CONVERSIONMESOPOROUS CARBONACIDIC CONDITIONS
ISSN
2196-0216
Abstract
Motivated by the challenge to find a low-cost catalyst with high activity for the oxygen reduction reaction (ORR), transition metal phosphides (TMPs) appear to be one of the most burgeoning alternatives to noble metal based electrocatalysts. In addition to the low cost, TMPs have numerous interesting features such as high conductivity and chemical stability. Since, the catalytic activity of TMPs is highly dependent on the metal/phosphorous ratio, herein, we report the investigation of nickel-phosphide/carbon composites of different stoichiometries (NixPy/C) with tractable nickel phosphide phases as promising electrocatalyst for ORR under alkaline and acidic conditions. The NixPy/C composites are obtained by carbonization of a Ni-struvite (NiNH4PO4 ⋅ H2O) coated phenol-formaldehyde resin at different temperatures, resulting in variations of the formed NixPy phases. As expected, it is found that the electrocatalytic ORR performance of the NixPy/C composites highly depends on the predominant phase of nickel phosphide formed. The highest catalytic activity for ORR in alkaline as well as acidic media was found for the NixPy/C composite with the highest proportion of Ni2P as a predominant phase, obtained at 800 °C. For composites with NiP2 and Ni12P5 as the predominant phase, obtained at lower and higher temperatures, respectively, a lower catalytic activity was found. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
URI
http://hdl.handle.net/20.500.11750/9044
DOI
10.1002/celc.201800232
Publisher
Wiley-VCH Verlag
Related Researcher
  • Author Yu, Jong-Sung Light, Salts and Water Research Group
  • Research Interests Materials chemistry; nanomaterials; electrochemistry; carbon and porous materials; fuel cell; battery; supercapacitor; sensor and photochemical catalyst
Files:
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Collection:
Department of Energy Science and EngineeringLight, Salts and Water Research Group1. Journal Articles


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