synthesis and application of mofs derived nanoporous carbon as an electrocatalyst in oxygen evolution reaction

Abstract: to meet the world's rising energy demand and environmental problems, developing sustainable clean energy is unavoidable [1]. hydrogen is being more widely used. splitting water into hydrogen and oxygen through an electrochemical process is accepted especially, the anodic reaction of oxygen evolution reaction (oer). this reaction is facing problems due to the needed high energy and slow kinetic. so the overpotential of the oer can be reduced by efficient electrocatalysts [2]. metal-organic frameworks (mofs) can be good choices as an electrocatalyst [3]. in this study, c-mil-101(fe), c-cofemof1, and c-cofemof2 were synthesized by solvothermal method and then carbonized. mofs were characterized by scanning electron microscopy (sem). also, electrocatalytic performance of these materials was investigated for oer in 1.0m koh. the prepared c-cofemof2 has shown excellent electrocatalytic activity toward oer in the alkaline condition. the sem image of c-cofemof2 showed that the c-cofemof2 appeared as a spherical morphology. also, the oer performance of materials was evaluated by lsv curve, tafel plot and eis. the overpotential of c-mil-101(fe), c-cofemof1 and c-cofemof2 at 10 ma cm-2 was 470 mv, 450 mv and 390 mv, respectively. the tafel slop of c-cofemof2 was equal to 65.2 mv dec-1 which was much smaller than c-mil-101(fe) (100.2 mv dec-1) and c-cofemof1 (96.4 mv dec-1). the nyquist plots of c-mil-101(fe), c-cofemof1 and c-cofemof2 were prepared also. the rct amount was calculated, and it was equal to 690.7 ω, 590.6 ω and 80.5 ω for the c-mil-101(fe), c-cofemof1 and c-cofemof2, respectively. in summary, materials were synthesized by solvothermal method and then the carbonization process was done. by using lsv polarization curves, tafel plots, and eis, the electrocatalytic performance of materials was investigated. the carbonization process improves the oer performance. so, c-cofemof2 was investigated better electrocatalyst than others.