Hydrogen Oxidation on Ni-Based Electrocatalysts: The Effect of Metal Doping
AbstractCarbon 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
- Supplementary File 1:
PDF-Document (PDF, 2362 KB)
Share & Cite This Article
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.
Davydova ES, Zaffran J, Dhaka K, Toroker MC, Dekel DR. Hydrogen Oxidation on Ni-Based Electrocatalysts: The Effect of Metal Doping. Catalysts. 2018; 8(10):454.Chicago/Turabian Style
Davydova, Elena S.; Zaffran, Jérémie; Dhaka, Kapil; Toroker, Maytal C.; Dekel, Dario R. 2018. "Hydrogen Oxidation on Ni-Based Electrocatalysts: The Effect of Metal Doping." Catalysts 8, no. 10: 454.
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.