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Utilization of the superior properties of highly mesoporous PVP modified NiCo_2O_4 with accessible 3D nanostructure and flower-like morphology towards electrochemical methanol oxidation reaction

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Journal of Energy Chemistry 2019年第2期28卷 136-146页

作者： gracita m.tomboc medhen W.Abebe Anteneh F.Baye Hern Kim Department of Energy Science and Technology Smart Living Innovation Technology CenterMyongji University

Up to this date,researchers are still facing difficulties to expand the technology of direct methanol fuel cells(DmFCs) because of the high overpotential required to oxidize the methanol and its relatively poor performance due to CO poisoning of the leading-high cost anode *** line with this,we have successfully modified the morphological structure and composition of low cost cobalt based-metal oxides,mCo_2O_4(m = Zn and Ni),with the simple and noble use of polyvinyl pyrrolidone(PVP) as growth modifier and surface stabilizer during the synthesis of nanoparticles in our previous reports,which shown high electrocatalytic activity and strong *** to the good performance of our PVP modified mCo_2O_4 towards pseudocapacitor and oxygen evolution reaction applications,we decided to extend our research study to methanol oxidation ***,PVP modified Ni Co_2O_4 electrode directly grown on nickel foam substrate via a simple hydrothermal process exhibited better performance compared with PVP modified ZnCo_2O_4 and NiCo_2O_4 without *** had obtained a remarkably low onset potential of 0.285 V and high current density of 280 m A cm^(-2),and shown great stability and high poison tolerance during a continuous CV cycling and Chronoamperometry test,which attained high efficiency of 86.86%and 98.52%,*** positive results of PVP modified Ni Co_2O_4 electrode towards mOR might be attributed to its hierarchical 3 D nanostructures with highly mesoporous surface and large surface area which may have provided numerous electroactive sites,and the exceptional corrosion stability of Ni Co_2O_4 electrode in alkaline solution.

关键词： NiCo2O4 3D nanostructure Electrochemical methanol oxidation Current density

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