Synthesis and characterization of transition metal mixed oxide doped graphene embedded durable electrocatalyst for hydrogen evolution reaction
| Autor: | Sreenivasan Rijith, S. Sarika, S. Abhilash, V.S. Sumi |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Tafel equation
Materials science Renewable Energy Sustainability and the Environment Graphene Oxide Energy Engineering and Power Technology Exchange current density 02 engineering and technology Chronoamperometry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrocatalyst 01 natural sciences 0104 chemical sciences law.invention chemistry.chemical_compound Fuel Technology Chemical engineering chemistry law Mixed oxide Fourier transform infrared spectroscopy 0210 nano-technology |
| Zdroj: | International Journal of Hydrogen Energy. 46:16387-16403 |
| ISSN: | 0360-3199 |
| Popis: | A promising electrocatalyst containing variable percentage of V2O5–TiO2 mixed oxide in graphene oxide support was prepared by embedding the catalyst on Cu substrate through facile electroless Ni–Co–P plating for hydrogen evolution reaction. The solvothermal decomposition method was opted for tuning the crystalline characteristics of prepared material. The optimized mixed oxide was well characterized, active sites centres were identified and explained by X-ray diffraction, high resolution tunnelling electron microscopy, scanning electron microscopy coupled with energy dispersive X-ray and X-ray photon spectroscopy analysis. The structural and electronic characteristics of material was done by fourier transform infrared spectroscopy and the electrochemical behaviour of the prepared material was evaluated by using Tafel plot, electrochemical impedance analysis, linear sweep voltammetry, open circuit analysis and chronoamperometry measurements. The results show the enhanced catalytic activity of Ni–Co–P than pure Ni–P plate, due to synergic effect. Moreover, the prepared mixed oxide incorporated Ni–Co–P plate has a high activity towards HER with low over potential of 101 mV, low Tafel slope of 36 mVdec−1, high exchange current density of 9.90 × 10−2 Acm−2. |
| Databáze: | OpenAIRE |
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