Preparation And Electrocatalytic Performance Of MOFs-derived Carbon Matrix Composites

For the development of sustainable energy conversion devices,stable and efficient electrocatalysts play an important role in oxygen reduction reaction(ORR)and hydrogen evolution reaction(HER).In order to solve the important scientific problems in the field of electrocatalysis,this thesis prepared a series of high-performance ORR and HER bifunctional electrocatalysts through the synthesis and regulation of carbon matrix composites derived from MOFs.The main research contents are as follows:1.Using ZIF-8 as template,rhodium trichloride(RhCl₃)was introduced to prepare the precursor by vacuum freeze drying,and further carbonization at high temperature to obtain rhodium(Rh)nitrogen co-doped porous carbon material(Rh NC-900).The introduction of RhCl₃enriched a large number of Rh metal nanoparticles in carbon materials,and the catalytic performance of ORR and HER was greatly improved.Rh NC-900 exhibited good ORR performance in alkaline electrolyte with a half-wave potential(E_1/2)of 0.803V and good HER performance in acidic electrolyte with an overpotential at 10 m A cm^-2current density (E_j=10)of 89 m V.At the same time,the catalyst also shows good stability,which provides a new idea for the synthesis of efficient and stable bifunctional electrocatalysts.2.Using ZIF-8 as template,rhodium trichloride(Ru Cl₃)was introduced to prepare the precursor by vacuum freeze drying,and further carbonization at high temperature to obtain rhodium(Ru)nitrogen co-doped porous carbon material(Ru NC-1000).The introduction of Ru Cl₃enriched a large number of Ru metal nanoparticles in carbon materials,and the catalytic performance of ORR and HER was greatly improved.Ru NC-1000 exhibited good ORR performance in alkaline electrolyte with a half-wave potential(E_1/2)of 0.821V and good HER performance in acidic electrolyte with an overpotential at 10 m A cm^-2current density (E_j=10)of 83 m V.At the same time,the catalyst also shows good stability,which provides a new idea for the synthesis of efficient and stable bifunctional electrocatalysts.