We report chemical vapor phase polymerization(VPP) deposition of poly(3,4-ethylenedioxythiophene)(PEDOT) and PEDOT/graphene on porous dielectric tantalum pentoxide(Ta_2O_5) surface as cathode films for solid tantalum ...We report chemical vapor phase polymerization(VPP) deposition of poly(3,4-ethylenedioxythiophene)(PEDOT) and PEDOT/graphene on porous dielectric tantalum pentoxide(Ta_2O_5) surface as cathode films for solid tantalum electrolyte capacitors. The modified oxidant/oxidant-graphene films were first deposited on Ta_2O_5 by dip-coating, and VPP process was subsequently utilized to transfer oxidant/oxidant-graphene into PEDOT/PEDOT-graphene films. The SEM images showed PEDOT/PEDOT-graphene films was successfully constructed on porous Ta_2O_5 surface through VPP deposition, and a solid tantalum electrolyte capacitor with conducting polymer-graphene nano-composites as cathode films was constructed. The high conductivity nature of PEDOT-graphene leads to resistance decrease of cathode films and lower contact resistance between PEDOT/graphene and carbon paste. This nano-composite cathode films based capacitor showed ultralow equivalent series resistance(ESR) ca. 12 m? and exhibited excellent capacitance-frequency performance, which can keep 82% of initial capacitance at 500 KHz. The investigation on leakage current revealed that the device encapsulation process has no influence on capacitor leakage current, indicating the excellent mechanical strength of PEDOT/PEDOT-gaphene films. This high conductivity and mechanical strength of graphene-based polymer films shows promising future for electrode materials such as capacitors, organic solar cells and electrochemical energy storage devices.展开更多
Sol-gel is a promising technique for the synthesis of organic-inorganic hybrid materials of class II. One of the most interesting applications for these hybrid materials is as solid polymer electrolytes (SPEs). In par...Sol-gel is a promising technique for the synthesis of organic-inorganic hybrid materials of class II. One of the most interesting applications for these hybrid materials is as solid polymer electrolytes (SPEs). In particular, when doped with proton species they have potential applications in fuel cells. In this paper SiO2–PEG1500 hybrids of class II were prepared with different contents of SiO2 and phosphotungstic acid. The influence of the SiO2 content in the matrix has been studied. The samples were investigated by thermal analysis (TGA and DSC), X-ray diffraction, infrared spectros-copy (IR), scanning electron microscopy (SEM) and Impedance Spectroscopy.展开更多
为代替纤维素纸(C-P)基电解质膜用于铝空气电池,利用静电纺丝技术制备了聚吲哚/聚丙烯腈(PIN/PAN)聚合物基电解质膜。采用SEM和FTIR对PIN/PAN纤维表面形貌及化学组成进行了分析。通过电化学工作站和电池测试系统分析了PIN含量对PIN/PAN...为代替纤维素纸(C-P)基电解质膜用于铝空气电池,利用静电纺丝技术制备了聚吲哚/聚丙烯腈(PIN/PAN)聚合物基电解质膜。采用SEM和FTIR对PIN/PAN纤维表面形貌及化学组成进行了分析。通过电化学工作站和电池测试系统分析了PIN含量对PIN/PAN聚合物基电解质膜离子电导率、离子扩散系数及固态铝空气电池放电性能的影响。结果表明,PIN/PAN纤维的孔隙率、吸液率、断裂伸长率与加入的PIN含量有关,同时对碱性溶液具有良好的吸附能力及机械性能,其中,PIN含量(以PAN溶液的质量为基准,其中,溶剂为N,N-二甲基甲酰胺,下同)为4%的PIN/PAN纤维(记为4%PIN/PAN纤维)的吸液率达496%、孔隙率为87.1%、断裂伸长率为8.7%,分别是C-P的3.2、1.1、3.8倍。基于PIN/PAN纤维制备的PIN/PAN聚合物基电解质膜可有效提升固态铝空气电池性能。其中,4%PIN/PAN聚合物基电解质膜在3、5、7 m A/cm^(2)电流密度下,放电时长比C-P铝空气电池分别提升约18%、32%、38%,离子电导率为6.7×10^(–4)S/cm,离子扩散系数为2.69×10^(–8)cm^(2)/S。展开更多
基金supported by the National Science Foundation of China(NSFC)(No.61101029)the Fundamental Research Funds for the Central Universities(No.ZYGX2010J057)+1 种基金the national defense pre-research foundation(No.9140A23070111DZ02042)A Plan for Supporting the New Century Talents(No.NCET-12-0091)
文摘We report chemical vapor phase polymerization(VPP) deposition of poly(3,4-ethylenedioxythiophene)(PEDOT) and PEDOT/graphene on porous dielectric tantalum pentoxide(Ta_2O_5) surface as cathode films for solid tantalum electrolyte capacitors. The modified oxidant/oxidant-graphene films were first deposited on Ta_2O_5 by dip-coating, and VPP process was subsequently utilized to transfer oxidant/oxidant-graphene into PEDOT/PEDOT-graphene films. The SEM images showed PEDOT/PEDOT-graphene films was successfully constructed on porous Ta_2O_5 surface through VPP deposition, and a solid tantalum electrolyte capacitor with conducting polymer-graphene nano-composites as cathode films was constructed. The high conductivity nature of PEDOT-graphene leads to resistance decrease of cathode films and lower contact resistance between PEDOT/graphene and carbon paste. This nano-composite cathode films based capacitor showed ultralow equivalent series resistance(ESR) ca. 12 m? and exhibited excellent capacitance-frequency performance, which can keep 82% of initial capacitance at 500 KHz. The investigation on leakage current revealed that the device encapsulation process has no influence on capacitor leakage current, indicating the excellent mechanical strength of PEDOT/PEDOT-gaphene films. This high conductivity and mechanical strength of graphene-based polymer films shows promising future for electrode materials such as capacitors, organic solar cells and electrochemical energy storage devices.
文摘Sol-gel is a promising technique for the synthesis of organic-inorganic hybrid materials of class II. One of the most interesting applications for these hybrid materials is as solid polymer electrolytes (SPEs). In particular, when doped with proton species they have potential applications in fuel cells. In this paper SiO2–PEG1500 hybrids of class II were prepared with different contents of SiO2 and phosphotungstic acid. The influence of the SiO2 content in the matrix has been studied. The samples were investigated by thermal analysis (TGA and DSC), X-ray diffraction, infrared spectros-copy (IR), scanning electron microscopy (SEM) and Impedance Spectroscopy.
文摘为代替纤维素纸(C-P)基电解质膜用于铝空气电池,利用静电纺丝技术制备了聚吲哚/聚丙烯腈(PIN/PAN)聚合物基电解质膜。采用SEM和FTIR对PIN/PAN纤维表面形貌及化学组成进行了分析。通过电化学工作站和电池测试系统分析了PIN含量对PIN/PAN聚合物基电解质膜离子电导率、离子扩散系数及固态铝空气电池放电性能的影响。结果表明,PIN/PAN纤维的孔隙率、吸液率、断裂伸长率与加入的PIN含量有关,同时对碱性溶液具有良好的吸附能力及机械性能,其中,PIN含量(以PAN溶液的质量为基准,其中,溶剂为N,N-二甲基甲酰胺,下同)为4%的PIN/PAN纤维(记为4%PIN/PAN纤维)的吸液率达496%、孔隙率为87.1%、断裂伸长率为8.7%,分别是C-P的3.2、1.1、3.8倍。基于PIN/PAN纤维制备的PIN/PAN聚合物基电解质膜可有效提升固态铝空气电池性能。其中,4%PIN/PAN聚合物基电解质膜在3、5、7 m A/cm^(2)电流密度下,放电时长比C-P铝空气电池分别提升约18%、32%、38%,离子电导率为6.7×10^(–4)S/cm,离子扩散系数为2.69×10^(–8)cm^(2)/S。
