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In this work, we have successfully synthesized the cost-effective, abundant in nature and environmentally friendly SrMoO 4 /MWCNT-PVP by using the co-precipitation technique for hydrogen evolution reaction (HER). Prepared nanocomposites were characterized by XRD, which confirms the formation of tetragonal structure of SrMoO 4 and indexed with JCPDS (01-074-3912). Raman spectra confirm the combination of SrMoO 4 with carbon composite (verified by D and G band 1.02 I D /I G ratio) and its functional group was further analyzed with the help of FTIR spectra. Synthesized product morphology was characterized by using SEM and TEM images, which confirms formation of well-defined dumb-bell shaped nanostructures with the combination of carbon nanotube and also it further confirms the formation of polycrystalline nature of the material. The elemental composition was analyzed by EDS images, which confirms the occurrence of Sr, Mo, O, and C in an appropriate form with a uniform distribution, respectively. MWCNT in SrMoO 4 incorporation led to decrease overpotential of 204 mV and 110 mV/dec Tafel slope of the material, which was examined by the LSV curves and Tafel plot analysis. Electrochemical impedance spectroscopy was also investigated, and it delivered the small charge-transfer resistance of 248 Ω, which further supporting the HER analysis and denoting the promising HER kinetics. Therefore, our work unlocks a new path for the properly tuned nanostructured morphology of metal oxide with carbon composite for electrochemical hydrogen evolution reaction application. [ABSTRACT FROM AUTHOR]

Molybdenum oxide (MoO 3) nanomaterials have received remarkable attention in biomedical applications, energy storage devices, and conversion devices. Orthorhombic phase molybdite (α-MoO 3) was successfully synthesized via hydrothermal method and the structure was confirmed through standard characterizations. Electrochemical performance was explored to evaluate specific capacitance, current densities, and stability. Product-specific capacitances were 164, 243, and 350 F/g at 10 mV/s and current densities were 194, 305, and 440 mA/g. M3 electrode showed 84% retention toward oxygen evolution reaction activity. The chronoamperometry study was conducted over 10 h to determine the long-term stability of M3 electrode. It showed high stability and good conductivity. Thus, it can be said that MoO 3 is a promising material to improve electrochemical performance and be used in preparing an efficient electrochemical energy conversion device. [ABSTRACT FROM AUTHOR]