ZIF-67 derived Co/Co9S8 loaded carbon materials as ORR catalysts
As an important electrochemical energy conversion and storage device,Zinc-air batteries(ZABs)have attracted attention because of their high energy density,low cost and environmental friendliness.However,the slow kinetic reaction of the air cathodes has hindered development of ZABs.Therefore,we used a hydrothermal pyrolytic-ammonia reduction method to prepare an electrocatalyst of ZIF-67 derived N-doped carbon-based Co and Co9S8 nanoparticles(Co/Co9S8@NC-1).The electrochemical results show that the sample has excellent ORR catalytic activity,and its half-wave potential is 0.85 V,which is close to commercial Pt/C.Compared with Pt/C+Ir/C-based ZABs(open circuit voltage of 1.47 V),Co/Co9S8@NC-1 based ZABs have an open circuit voltage of 1.51 V,and exhibit a power density of 105.3 mW/cm2 and cycle stability of 172 h(Pt/C+Ir/C of 147 h).This work provides an effective way to develop non-precious metal-based ORR catalysts.
metal-organic frameworkoxygen reduction reactionnon-precious metal catalystzinc-air batteryCo9S8
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