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Polyaniline and Graphene Based Symmetric and Asymmetric Solide-State Supercapacitor

Liu, Chang
http://rave.ohiolink.edu/etdc/view?acc_num=akron1429622924

Abstract Details

2015, Master of Science, University of Akron, Polymer Engineering.
The great demands of electronics is stimulated the development of portable energy storage devices. Supercapacitors show great potentials with its high power density and fast charge-discharge rate. Graphene material has advantages of high surface area, good electrical conductivity and is a promising material for fabrication of the electrical double layer capacitors. But the inevitable stacking between graphene sheets restricts the performance of the materials. Polyaniline (PANI) exhibits high intrinsic specific capacitance and good environmental stability, which is a promising candidate for pesudo capacitors. However, the shrinkage and swelling of PANI in charge-discharge process give the material mechnial degradation and less cycle stability. Here, we fabricate polyaniline/graphene composite electrode and get the synergistic effect of the electrochemical performance from the two materials. The specific capacitance is significantly improved and the energy density of devices is also enhanced. The improvement comes from the combination of two materials. Meanwhile the morphology of the PANI also plays an important role in device performance. The nano-arrays we got in this study is uniform nano-dot and nano-fiber. We investigated different synthesis environments influencing the morphology of PANI and got morphology of nano-dot and nano-fiber. The uniform nano-array of PANI alleviates the aggregation of graphene sheet and thus gives an increase of surface area and pathways of ion diffusion. Liquid electrolyte based supercapacitors has problem with high-cost package, electrolyte leakage, large-scale production and flexibility of device. However, with the solid-state supercapacitors fabrication we resolve this problem. In our study, we fabricate both symmetric and asymmetric solid-state supercapacitors configuration. The symmetric supercapacitors can reach specific capacitance as 639 F/g high and the stability of device is 70% retention after 10,000 charge-discharge cycles. Both of these characteristic is higher than that of graphene based devices. To improve the work voltage of supercapacitors, we develop asymmetric supercapacitors configuration with PANI/graphene composite as positive electrode and graphene as negative electrode. The asymmetric device configuration can reach work voltage two times higher as that of symmetric device and the energy density is also enhanced 46%. The tandem devices we made can enlighten the blue LED over seventy seconds.
Xiong Gong, Dr. (Advisor)
Alamgir Karim, Dr. (Committee Member)
Yu Zhu, Dr. (Committee Member)
58 p.
Polymers
Supercapacitor Asymmetric Graphene Polyaniline Synergistic effect

Recommended Citations

Citations

  • Liu, C. (2015). Polyaniline and Graphene Based Symmetric and Asymmetric Solide-State Supercapacitor [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1429622924

    APA Style (7th edition)

  • Liu, Chang. Polyaniline and Graphene Based Symmetric and Asymmetric Solide-State Supercapacitor . 2015. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1429622924.

    MLA Style (8th edition)

  • Liu, Chang. "Polyaniline and Graphene Based Symmetric and Asymmetric Solide-State Supercapacitor ." Master's thesis, University of Akron, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1429622924

    Chicago Manual of Style (17th edition)

akron1429622924
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This open access ETD is published by University of Akron and OhioLINK.