ZIF衍生钴镍笼状双金属硫化物高效双功能电催化剂

ZIF-derived cobalt-nickel loaded cage-like bimetallic sulfide high-efficiency bifunctional electrocatalyst

锌-空气电池的阴极氧还原反应(ORR)动力迟缓,急需开发活性高、成本低的阴极催化剂。本文采用两次热解法合成了沸石咪唑酯骨架结构(ZIF)衍生的多孔碳负载Co、Ni双金属硫化物笼状纳米颗粒材料,通过SEM、XRD、Raman、N2吸附比表面分析、电化学分析等对负载Co、Ni笼状双金属硫化物的多孔碳进行形貌、结构表征以及性能测试。结果表明,金属硫化物导电性能优异,且热解后的多孔碳结构会暴露更多活性位点,具有优异的电催化活性,ORR性能测试中,其半波电位可达0.89 V,优于商用Pt/C催化剂的0.85 V。OER性能在电流密度为10 mA/cm^(2)时电位为1.79 V,与商用IrO_(2)(电位可达1.68 V)相当。本文制备的笼状双金属硫化物具有优异的性能,可作为锌-空气电池的优异双功能电催化剂。

Cathodic oxygen reduction reaction(ORR)of the zinc-air batteries is slow,urgently needed to develop cathode catalysts with high activity and low cost.Porous carbon with Co-Ni loaded cage-like bimetal sulfide nanoparticles derived from the Zeolitic imidazolate framework(ZIF)were synthesized by two-step pyrolysis methods.By SEM,XRD,Raman,N2 adsorption apparatus and electrochemical analysis,the morphology,structure and properties of porous carbon supported by Co and Ni cage bimetallic sulfide were characterized.The results show that the as-prepared bimetallic sulfide exposes more active sites and exhibits remarkable electrocatalytic activity.In the ORR performance test,the half-wave potential reached 0.89 V,better than the 0.85 V of commercial Pt/C catalysts.The OER performance shows a potential of 1.79 V at a current density of 10 mA/cm^(2),comparable to the commercial IrO_(2)(potential of up to 1.68 V).The caged bimetallic sulfide presents excellent properties which can be used as excellent dual function electrocatalysts for zinc-air cells.