Fabrication of monodispersed B,N co-doped hierarchical porous carbon nanocages through confined etching to boost electrocatalytic oxygen reduction  

作　　者：Xuefei Wang Chao Han Haitao Li Panpan Su Na Ta Yanfu Ma Zhenguo Huang Jian Liu 

机构地区：[1]School of Civil&Environmental Engineering,University of Technology Sydney,Sydney,NSW,2007,Australia [2]State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China [3]DICP-Surrey Joint Centre for Future Materials,University of Surrey Guildford,Surrey,GU27XH,UK

出　　处：《Nano Research》2023年第1期290-298,共9页纳米研究（英文版）

基　　金：We acknowledge support under the Australian Research Council’s Future Fellowship(No.FT190100658,Z.H.);support from the Alexander von Humboldt Foundation(Z.H.).X.W.also acknowledges the Chinese Scholarship Council(CSC)for financial support.

摘　　要：Dual heteroatom-doped carbons have attracted widespread research attention as catalysts in the field of energy storage and conversion due to their unique electronic structures and chemical tunability.In particular,boron and nitrogen co-doped carbon(B,N@C)has shown great potential for photo/electrocatalytic applications.However,more needs to be done for rational designing and regulating the structure of these materials to improve their catalytic performance.Herein,monodispersed hierarchical porous B,N@C nanocages were fabricated by pyrolyzing zeolite imidazole framework(ZIF)which was treated with ammonia borane or boric acid via an integrated double-solvent impregnation and nanocofined-etching method.The treated ZIF-8 provided an essential structural template to achieve B,N co-doped hierarchical structures with micro/meso/macro multimodal pore size distributions.The resultant B,N@C nanocages displayed high catalytic activities for electrochemical oxygen reduction reaction(ORR)in alkaline media,outperforming most carbon-based catalysts,particularly from the perspective of the half-wave potentials.Such high catalytic performance is due to the enhanced activity by the coexistence of B and N and the mass transfer promoted by the unique hierarchical porous structure.

关 键 词：heteroatom doping hierarchical porous carbon host-guest chemistry confined etching electrocatalysis mass transfer 

分 类 号：O64[理学—物理化学]