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Catalysts 2018, 8(10), 454; https://doi.org/10.3390/catal8100454

Hydrogen Oxidation on Ni-Based Electrocatalysts: The Effect of Metal Doping

1
The Wolfson Chemical Engineering Department, Technion—Israel Institute of Technology, 3200003 Haifa, Israel
2
The Nancy and Stephen Grand Technion Energy Program (GTEP), Technion—Israel Institute of Technology, 3200003 Haifa, Israel
3
Department of Material Science and Engineering, Technion—Israel Institute of Technology, 3200003 Haifa, Israel
*
Authors to whom correspondence should be addressed.
Received: 27 September 2018 / Revised: 9 October 2018 / Accepted: 11 October 2018 / Published: 15 October 2018
(This article belongs to the Special Issue Catalysts for Polymer Membrane Fuel Cells)
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Abstract

Carbon supported nanoparticles of monometallic Ni catalyst and binary Ni-Transition Metal (Ni-TM/C) electrocatalytic composites were synthesized via the chemical reduction method, where TM stands for the doping elements Fe, Co, and Cu. The chemical composition, structure and morphology of the Ni-TM/C materials were characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM) and energy-dispersive X-ray spectroscopy (EDS). The electrochemical properties towards hydrogen oxidation reaction in alkaline medium were studied using the rotating disc electrode and cycling voltammetry methods. A significant role of the TM dopants in the promotion of the hydrogen electrooxidation kinetics of the binary Ni-TM/C materials was revealed. A record-high in exchange current density value of 0.060 mA cm2Ni was measured for Ni3Fe1/C, whereas the monometallic Ni/C counterpart has only shown 0.039 mA cm2Ni. In order to predict the feasibility of the electrocatalysts for hydrogen chemisorption, density functional theory was applied to calculate the hydrogen binding energy and hydroxide binding energy values for bare Ni and Ni3TM1. View Full-Text
Keywords: metal doping; nickel-based catalyst; transition metals; synthesis; hydrogen oxidation reaction; exchange current density; alkaline medium; DFT; hydrogen binding energy; hydroxide binding energy metal doping; nickel-based catalyst; transition metals; synthesis; hydrogen oxidation reaction; exchange current density; alkaline medium; DFT; hydrogen binding energy; hydroxide binding energy
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Davydova, E.S.; Zaffran, J.; Dhaka, K.; Toroker, M.C.; Dekel, D.R. Hydrogen Oxidation on Ni-Based Electrocatalysts: The Effect of Metal Doping. Catalysts 2018, 8, 454.

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