N/S-Doped Hierarchical Porous Bamboo Carbon Fibers with Ultra-Large Surface Area and Highly Exposed Active Sites for Flexible Zinc-Air Battery  

作　　者：Yuhang Qian Xinye Liu Xiangjun Zheng Zilong Yang Yanjie Yu Fei Gao Xingmei Guo Yuanjun Liu Xuecheng Cao Ruihua Guo Junhao Zhang 

机构地区：[1]School of Environmental and Chemical Engineering,Jiangsu University of Science and Technology,Zhenjiang,Jiangsu,212003 China [2]Automotive Engineering Research Institute,Jiangsu University,301 Xuefu Road,Zhenjiang,Jiangsu,212013 China [3]College of Food Science and Technology,Shanghai Ocean University,Shanghai,201306 China [4]Marine Biomedical Science and Technology Innovation Platform of Lin-gang Special Area,Shanghai,201306 China

出　　处：《Chinese Journal of Chemistry》2024年第21期2647-2655,共9页中国化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.52102260,22379056,52202243);the project funded by China Postdoctoral Science Foundation(Grant Nos.2022M711545,2022M711371);Research and Practice Innovation Plan of Postgraduate Training Innovation Project in Jiangsu Province(SJCX23_2156);Shanghai Frontiers Research Center of the Hadal Biosphere,SciTech Funding by CSPFTZ Lingang Special Area Marine Biomedical Innovation Platform.

摘　　要：Facile mass transport channel and accessible active sites are crucial for binder-free air electrode catalysts in rechargeable flexible zinc-air battery(ZAB).Herein,a ZnS/NH3 dual-assisted pyrolysis strategy is proposed to prepare N/S-doped hierarchical porous bamboo carbon cloth(HP-NS-BCC)as binder-free air electrode catalyst for ZAB.BCC fabric with abundant micropores is firstly used as flexible carbon support to facilitate the heteroatom-doping and construct the hierarchical porous structure.ZnS nanospheres and NH3 activization together facilitate the electronic modulation of carbon matrix by N/S-doping and optimize the macro/meso/micropores structure of carbon fibers.Benefiting from the highly-exposed N/S-induced sites with enhanced intrinsic activity,the optimized mass transport of biocarbon fibers,as well as the ultra-large specific surface area of 2436.1 m^(2)·g^(-1),the resultant HP-NS-BCC catalyst exhibits improved kinetics for oxygen reduction/evolution reaction.When applied to rechargeable aqueous ZABs,it achieves a significant peak power density of 249.1 mW·cm^(-2).As binder-free air electrode catalyst,the flexible ZAB also displays stable cycling over 500 cycles with a minimal voltage gap of 0.42 V,showcasing promising applications in flexible electronic devices.

关 键 词：Hierarchical porous structure Bamboo carbon fibers N/S-doped catalyst Flexible Zn-air batteries Oxygen reduction reaction Oxygen evolution reaction Electrocatalysis Catalytic activity 

分 类 号：O64[理学—物理化学]