Enhanced methanol electro-oxidation over in-situ carbon and graphene supported one dimensional NiMoO4 nanorods

• NiMoO4,NiMoO4/C & NiMoO4/G nanorods are prepared by one pot hydrothermal synthesis.
• NiMoO4/C nanorods shows excellent electrocatalytic activity and stability.
• Increased current density was achieved through incorporation of carbon material.
• This work delivers a new promising electrode material for DMFC.

Non-precious NiMoO4 nanorods with carbon and graphene have been designed for methanol oxidation via one pot hydrothermal method. The physicochemical and electrocatalytic features of these catalysts are characterized. Among the three catalysts, carbon modified NiMoO4 shows an enhanced catalytic activity in terms of current density, onset potential, cyclic stability and high tolerance to intermediate towards methanol electro-oxidation. Moreover, the NiMoO4/C catalyst delivers a current density of 49 mA cm−2 at low onset potential of 0.45 V (vs. Hg/HgO) in 1 M KOH and 2.0 M methanol electrolyte. This greater electrocatalytic activity is attributed to the unique 1D microstructure of NiMoO4 nanorods with well distributed carbonaceous material, which enhances the efficient transport of electron/ion kinetics at the electrode and electrolyte interfaces. From this observation, it is concluded that the carbon modified NiMoO4 nanorods could be a promising alternate non-noble electrocatalysts for direct methanol fuel cell (DMFC) applications.

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