Integration of pore structure modulation and B,N co-doping for enhanced capacitance deionization of biomass-derived carbon  

作　　者：Yao Qiu Chunjie Zhang Rui Zhang Zhiyuan Liu Huazeng Yang Shuai Qi Yongzhao Hou Guangwu Wen Jilei Liu Dong Wang 

机构地区：[1]School of Materials Science and Engineering,Shandong University of Technology,266 Xincun West Road,Zibo,255000,China [2]School of Materials Science and Engineering,Harbin Institute of Technology,92 Xidazhi Street,Harbin,150001,China [3]College of Chemistry and Environmental Engineering,Shenzhen University,1066 Xueyuan Ave,Shenzhen,518060,China [4]College of Materials Science and Engineering,Hunan University,2 South Lushan Road,Changsha,410082,China

出　　处：《Green Energy & Environment》2023年第5期1488-1500,共13页绿色能源与环境（英文版）

基　　金：We gratefully acknowledge financial supports from the National Natural Science Foundation of China(No.52202371,51905125,52102364);the Natural Science Foundation of Shandong Province(No.ZR2020QE066);Opening Project of State Key Laboratory of Advanced Technology for Float Glass(No.2020KF08);SDUT&Zibo City Integration Development Project(No.2021SNPT0045);the fellowship of China Postdoctoral Science Foundation(No.2020M672081).

摘　　要：Biomass-derived carbon has demonstrated great potentials as advanced electrode for capacitive deionization(CDI),owing to good electroconductivity,easy availability,intrinsic pores/channels.However,conventional simple pyrolysis of biomass always generates inadequate porosity with limited surface area.Moreover,biomass-derived carbon also suffers from poor wettability and single physical adsorption of ions,resulting in limited desalination performance.Herein,pore structure optimization and element co-doping are integrated on banana peels(BP)-derived carbon to construct hierarchically porous and B,N co-doped carbon with large ions-accessible surface area.A unique expansionactivation(EA)strategy is proposed to modulate the porosity and specific surface area of carbon.Furthermore,B,N co-doping could increase the ions-accessible sites with improved hydrophilicity,and promote ions adsorption.Benefitting from the synergistic effect of hierarchical porosity and B,N co-doping,the resultant electrode manifest enhanced CDI performance for NaCl with large desalination capacity(29.5 mg g^(-1)),high salt adsorption rate(6.2 mg g^(-1)min^(-1)),and versatile adsorption ability for other salts.Density functional theory reveals the enhanced deionization mechanism by pore and B,N co-doping.This work proposes a facile EA strategy for pore structure modulation of biomass-derived carbon,and demonstrates great potentials of integrating pore and heteroatoms-doping on constructing high-performance CDI electrode.

关 键 词：Capacitive deionization Biomass-derived carbon Pore structure B N co-doping Desalination performance 

分 类 号：O646.54[理学—物理化学]