Preparation and study of electrocatalytic activity of Ni-Pd(OH)2/C nanocomposite for hydrogen evolution reaction in alkaline solution |
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| Affiliation: | 1. LBE, Univ Montpellier, INRA, Narbonne, France;2. Tampere University, Faculty of Engineering and Natural Sciences, Tampere, Finland;1. Key Laboratory of Physics and Technology for Advanced Batteries, Ministry of Education, College of Physics, Jilin University, Changchun, 130012, PR China;2. School of Science, Changchun University of Science and Technology, Changchun, 130022, PR China;1. Nanoqam, Department of Chemistry, University of Quebec at Montreal, QC, H3C 3P8, Canada;2. LEMFN, Department of Materials Engineering, University of Science and Technology, El M''naouer, BP-1505, Oran, Algeria;3. Laboratório de Química Analítica Ambiental, Faculdade de Química, Pontifícia Universidade Católica do Rio Grande do Sul, Brazil;1. College of Materials Science and Engineering, Nanjing Tech University, 30 Puzhu Road(S), Nanjing 211816, PR China;2. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing 211816, PR China;3. School of Materials Science and Engineering, Southeast University, Nanjing 211189, PR China |
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| Abstract: | A new catalyst (Ni-Pd(OH)2/C) for hydrogen evolution reaction (HER) was prepared by coelectrodeposition of Pd(OH)2/C nanoparticles and Ni on a Cu substrate in two steps. Furthermore, the effect of Mo ions in alkaline solution (1 M NaOH) on the electrocatalytic activity of Ni-Pd(OH)2/C nanocomposite was studied as an in-situ activator for the HER. The various electrochemical methods were employed to study the HER activity of the investigated new catalyst, including linear sweep voltammetry (LSV), the steady-state polarization Tafel curves, electrochemical impedance spectroscopy (EIS) and chronoamperometry (CA). The electrochemical measurements showed that the Ni-Pd(OH)2/C nanocomposite as a catalyst for the HER has an excellent catalytic activity with good stability in alkaline solution. Furthermore, the rate constants of the forward and backward reactions of Volmer and Heyrovský steps were estimated using Tafel-impedance data and revealed that the proton discharge electrosorption or Volmer reaction (k1= (6.8 ± 0.7) × 10−8 mol cm−2 s−1) was the rate determining step (RDS) of the HER on the surface of Ni-Pd(OH)2/C nanocomposite. Also, it was observed that the presence of Mo ions in alkaline solution could significantly increase the HER activity of Ni-Pd(OH)2/C nanocomposite. The comparison of RDS rate constant value with surface roughness (Rf) of Ni-Pd(OH)2/C catalyst showed that its high activity toward the HER originated from both increase in the surface roughness (∼20%) and increase in synergistic effect (∼80%). |
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| Keywords: | Hydrogen evolution reaction (HER) In-situ activation Tafel curves Electrochemical impedance spectroscopy (EIS) Rate constants |
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