Heteroatom tuning in agarose derived carbon aerogel for enhanced potassium ion multiple energy storage  

作　　者：Kaijun Xie Xin Liu Haolin Li Long Fang Kai Xia Dongjiang Yang Yihui Zou Xiaodong Zhang 

机构地区：[1]State Key Laboratory of Bio-fibers and Eco-textiles,Shandong Collaborative Innovation Center of Marine Biobased Fibers and Ecological Textiles,Institute of Marine Biobased Materials,College of Chemistry and Chemical Engineering,College of Environmental Science and Engineering,Qingdao University,Qingdao,China

出　　处：《Carbon Energy》2024年第3期239-254,共16页碳能源（英文）

基　　金：financially supported by the Natural Science Foundation of China(Grant No.22005165);the Major Science and Technology Innovation Project of Shandong(Grant No.2019JZZY010507);the Qingdao Municipal Science and Technology Bureau(Grant No.17-1-1-86-jch);the Key Technology Research and Development Program of Shandong(Grant No.2018GGX108005).

摘　　要：The incorporation of heteroatoms into carbon aerogels(CAs)can lead to structural distortions and changes in active sites due to their smaller size and electronegativity compared to pure carbon.However,the evolution of the electronic structure from single-atom doping to heteroatom codoping in CAs has not yet been thoroughly investigated,and the impact of codoping on potassium ion(K+)storage and diffusion pathways as electrode material remains unclear.In this study,experimental and theoretical simulations were conducted to demonstrate that heteroatom codoping,composed of multiple heteroatoms(O/N/B)with different properties,has the potential to improve the electrical properties and stability of CAs compared to single-atom doping.Electronic states near the Fermi level have revealed that doping with O/N/B generates a greater number of active centers on adjacent carbon atoms than doping with O and O/N atoms.As a result of synergy with enhanced wetting ability(contact angle of 9.26°)derived from amino groups and hierarchical porous structure,ON-CA has the most optimized adsorption capacity(−1.62 eV)and diffusion barrier(0.12 eV)of K^(+).The optimal pathway of K^(+)in ON-CA is along the carbon ring with N or O doping.As K^(+)storage material for supercapacitors and ion batteries,it shows an outstanding specific capacity and capacitance,electrochemical stability,and rate performance.Especially,the assembled symmetrical K^(+)supercapacitor demonstrates an energy density of 51.8 Wh kg^(−1),an ultrahigh power density of 443Wkg^(−1),and outstanding cycling stability(maintaining 83.3%after 10,000 cycles in 1M KPF6 organic electrolyte).This research provides valuable insights into the design of highperformance potassium ion storage materials.

关 键 词：AGAROSE carbon aerogels O/N/B codoping potassium-ion battery potassium-ion supercapacitor 

分 类 号：TB34[一般工业技术—材料科学与工程] TQ427.26[化学工程]