A unique nest-type catalyst has been designed with a nest of oxygen capture surrounding catalytic Pt centers,which shows much promoted performance,on the base of Pt/C catalyst,for oxygen reduction reaction(ORR).The nest is constructed with nitrogen-doped carbon matrix(NCM),derived from the controlled carbonization of PANI precursor,to cover Pt/C catalyst.The unique structure of the catalyst(denoted as NCM ? Pt/C)has many merits.Firstly,it can capture oxygen both in air and in acidic elec-trolyte.Compared with naked Pt/C,it is found that,in air,the oxygen concentration within the porous nest of NCM surrounding Pt/C particles is～13 times higher than atmospheric oxygen concentration and,in acidic electrolyte,the concentration of activated oxygen over the catalyst NCM ? Pt/C rise to～1.9 times.Secondly,the NCM nest offers a special electronic modulation on Pt centers toward modified ORR kinetics and then catalytic performances.With these merits,compared with Pt/C,the NCM ? Pt/C catalyst shows 3.2 times higher turnover frequency value and 2.9 times enhanced specific activity for ORR with half-wave potential at 0.894 V.After 50,000 sweeping cycles,the NCM ? Pt/C catalyst retains～66％mass activity and still has advantages over the fresh Pt/C catalyst.We envision that the nest-type catalyst provides a new idea for progress of practical Pt/C ORR catalyst.

Teng Chen;Yida Xu;Deming Meng;Xuefeng Guo;Yan Zhu;Luming Peng;Jianqiang Hu;Weiping Ding

Key Lab of Mesoscopic Chemistry,School of Chemistry and Chemical Engineering,Nanjing University,Nanjing 210023,Jiangsu,China;Department of Aviation Oil and Material,Air Force Logistics Academy,Xuzhou 221000,Jiangsu,China

能源化学

[1]Teng Chen;Yida Xu;Deming Meng;Xuefeng Guo;Yan Zhu;Luming Peng;Jianqiang Hu;Weiping Ding-.Nest-type NCM ? Pt/C with oxygen capture character as advanced electrocatalyst for oxygen reduction reaction)[J].能源化学,2022(08):304-312

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