Cobalt-rare earth bimetallic selective catalyst for electrocatalytic oxygen reduction
Electrocatalytic oxygen reduction reaction(ORR)involves two types of reactions:two-electron(2e-)and four-electron(4e-)ORR.Typically,2e-ORR is employed for the synthesis of hydrogen per-oxide(H2O2),while 4e-ORR is used to get water(H2O).In general,4e-ORR proceeds more readily,but the products of 2e-ORR are more valuable.Therefore,the investigation of electrocatalysts with excep-tional 2e-ORR selectivity holds significant importance.Transition metal cobalt(Co)compounds exhibit remarkable electrocatalytic oxygen reduction activity and can catalyze the induction of carbon nanotubes.Rare-earth-cobalt dual-metal carbon nanotube catalysts,including CoSm-CNTs,CoEu-CNTs,and CoGd-CNTs,were synthesized by high-temperature solid-state synthesis method using samarium(Sm),europium(Eu),gadolinium(Gd)],cobalt(Co),and graphitic carbon nitride(g-C3N4)as pre-cursors.Experimental data demonstrate that CoGd-CNTs exhibits the highest oxygen reduction activity(ORR),while CoEu-CNTs displays exceptional H2O2 selectivity.
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