Synthesis and characterization of transition metal mixed oxide doped graphene embedded durable electrocatalyst for hydrogen evolution reaction. (29th April 2021)

• Record Type: Journal Article
• Authors: Sarika, S.; Abhilash, S.; Sumi, V.S.; Rijith, S.
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 30(2021)
• Page Start: 16387
• Page End: 16403
• Publication Date: 2021-04-29
• Subjects: Graphene oxide -- Mixed oxide electrocatalyst -- Ni–Co–P -- Titanium dioxide -- Hydrogen evolution reaction; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.01.137
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: A promising electrocatalyst containing variable percentage of V2 O5 –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 . Graphical abstract: Image 1 Highlights: Development of electrocatalysts for HER from transition metal mixed oxides. Controllable fabrication with remarkable stability and performance assessment. Favourable rate of HER related to active sites, overpotential and Tafel slopes. Well illustrated characterization of Ni–Co–P/VTG3 along with all precursors. Satisfactory electrocatalytic performance assessment via electrochemical analysis.