Hydrogen evolution reaction(HER),oxygen evolution reaction(OER),and oxygen reduction reaction(ORR)serve as the most promising electrochemical processes for renewable energy.Developing multi-functional electrocatalysts with high performance for HER,OER and ORR still remains a challenge.Herein,we report a facile method to prepare P,N-co-doped porous carbon encapsulated Fe-CoP(A-Fe-CoP/CPN)electrocatalyst through freeze drying,carbonization,and KOH activation.The acquired A-Fe-CoP/CPN possesses abundant pores with large surface area,which provides sufficient defect-rich sites for HER,OER,and ORR,in alkaline or acidic electrolytes.The A-Fe-CoP/CPN shows low overpotential and good stability for HER and OER in alkaline electrolyte.Density functional theory(DFT)computations reveal that the addition of Fe greatly facilitates the rate-determining step and overall catalytic pathway for both HER and OER A-Fe-CoP/CPN also exhibits low half-wave potential(E1/2)for ORR,which indicates an enhanced performance than that of the noble Pt/C catalyst.Zn-air battery equipped with the A-Fe-CoP/CPN catalyst exhibits a high energy density(849 mAh g-1)and a long-time stability at 5 mA cm-2.This finding not only offers a facile strategy to prepare porous carbon materials with defect-rich sites,but also provides guidance for developing multifunctional electrocatalysts for wide electrochemical reactions.

State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,Hebei,China;Hebei Key Laboratory of Applied Chemistry,School of Environmental and Chemical Engineering,Yanshan University,Qinhuangdao 066004,Hebei,China;Hebei Engineering Research Center for Water Saving in Industry,Shijiazhuang 050081,Hebei,China;Institute of Energy Resources,Hebei Academy of Sciences,Shijiazhuang 050081,Hebei,China

[1]Yuelong Xu;Ran Wang;Jingyue Wang;Yaru Zhang;Tifeng Jiao-.Encapsulation of Fe-CoP with P,N-co-doped porous carbon matrix as a multifunctional catalyst for wide electrochemical applications)[J].能源化学,2022(08):36-44

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