本文主要研究以碳纳米管（carbon nanotubes,CNTs）-FexOy复合材料作为电极分别在水溶液和凝胶电解质中的电化学性能。采用化学气相沉积法制备CNTs薄膜,并利用超声雾化热解法于不同的沉积时间下制备FexOy与其复合制作成电极。对复合电极进行形貌表征及电化学性能检测,包括循环伏安、恒流充放电及交流阻抗测试。结果分析表明,电极的比电容随着沉积时间的增加而增加,且均高于纯CNTs电极,同时界面电荷传递电阻随之减小;然而随着沉积时间的继续增大,样品比电容和能量密度明显下降。沉积10min样品在凝胶电解质的循环伏安测试中比电容达到最大值102.8 F·g^-1。
CNTs-FexOy nanocomposite film was employed as the electrode,and its electrochemical performance was investigated in both water solution and gel electrolyte.Carbon nanotube(CNTs) film was first fabricated by chemical vapor deposition,on which FexOy vapor was condensed by ultrasonic spray pyrolysis to form the CNTs-FexOy nanocomposite film electrode.After the electrode morphology analysis,the electrochemical property including cyclic voltammetry,chronopotentiometry and AC impedance were measured.The results show that the composite electrodes exhibited enhanced capacitive behavior relative to pure CNTs.However,over loaded FexOy in CNTs-FexOy composites deteriorated their capacitive performance.And the sample FexOy deposited for 10min demonstrated the optimized electrochemical capacitive properties,with the highest specific capacitance(Csp) in gel electrolyte of 102.8 F·g^-1 and lowest interface charge transfer resistance.
参考文献
| [1] | Chensha Li;Dazhi Wang;Tongxiang Liang .A study of activated carbon nanotubes as double-layer capacitors electrode materials[J].Materials Letters,2004(29):3774-3777. |
| [2] | B. Zhang;J. Liang;C. L. Xu .Electric double-layer capacitors using carbon nanotube electrodes and organic electrolyte[J].Materials Letters,2001(6):539-542. |
| [3] | Ahn HJ;Sohn JI;Kim YS;Shim HS;Kim WB;Seong TY .Electrochemical capacitors fabricated with carbon nanotubes grown within the pores of anodized aluminum oxide templates[J].Electrochemistry communications,2006(4):513-516. |
| [4] | Yanzhen Zheng;Milin Zhang;Peng Gao .Preparation and electrochemical properties of multiwalled carbon nanotubes-nickel oxide porous composite for supercapacitors[J].Materials Research Bulletin: An International Journal Reporting Research on Crystal Growth and Materials Preparation and Characterization,2007(9):1740-1747. |
| [5] | Sivakkumar,S.R;Ko,J.M;Kim,D.Y;Kim,B.C,Wallace,G.G .Performance evaluation of CNT/polypyrrolc/ MnO2 composite electrodes for electrochemical capacitors[J].Electrochimica Acta,2007,52(25):7377-7385. |
| [6] | Byung Jun Lee;S.R. Sivakkumar;Jang Myoun Ko .Carbon nanofibre/hydrous RuO_2 nanocomposite electrodes for supercapacitors[J].Journal of Power Sources,2007(2):546-552. |
| [7] | Wu,N.L;Wang,S.Y;Han,C.Y;Wu,D.S,Shiue,L.R .Electrochemical capacitor of magnetite in aqueous electrolytes[J].Journal of Power Sources,2003,113(01):173-178. |
| [8] | Wang SY.;Wu NL. .Operating characteristics of aqueous magnetite electrochemical capacitors[J].Journal of Applied Electrochemistry,2003(3/4):345-348. |
| [9] | Shih-Yu Wang;Kuo-Chuan Ho;Shin-Liang Kuo .Investigation on Capacitance Mechanisms of Fe_3O_4 Electrochemical Capacitors[J].Journal of the Electrochemical Society,2006(1):A75-A80. |
| [10] | Mallouki M;Tran-Van F;Sarrazin C;Simon P;Daffos B;De A;Chevrot C;Fauvarque J .Polypyrrole-Fe2O3 nanohybrid materials for electrochemical storage[J].Journal of solid state electrochemistry,2007(3):398-406. |
| [11] | Lewandowski A.;Swiderska A. .Electrochemical capacitors with polymer electrolytes based on ionic liquids[J].Solid state ionics,2003(3/4):243-249. |
| [12] | Matsuda Y.;Takeuchi H.;Okuhama Y.;Inoue K. .Gel polymer electrolytes for electric double layer capacitors[J].Solid state ionics,1998(Special Issue SI):103-107. |
| [13] | Jing Jiang;Deshu Gao;Zhaohui Li;Guangyao Su .Gel polymer electrolytes prepared by in situ polymerization of vinyl monomers in room-temperature ionic liquids[J].Reactive & functional polymers,2006(10):1141-1148. |
| [14] | J. Wei;N. Nagarajan;I. Zhitomirsky .Manganese oxide films for electrochemical supercapacitors[J].Journal of Materials Processing Technology,2007(1/3):356-361. |
| [15] | 吕东生,李伟善.LiMn2O4/LiPF6-（EC+DEC）溶液界面电化学研究[J].无机材料学报,2004(04):801-808. |
| [16] | Wang,X.Z;Li,M.G;Chen,Y.W;Cheng,R.M,Huang,S.M,Pan,L.K,Sun,Z .Electrosorption of ions from aqueous solutions with carbon nanotubes and nanofibers composite film electrodes[J].Applied Physics Letters,2006,89:053127-1-053127-3. |
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