Preparation and properties of flexible supercapacitor based on biochar and solid gel-electrolyte

被引：0
|
作者：
Yu X. [1 ,2 ]
Luo Q. [1 ]
Pan J. [2 ,3 ]
Han Y. [1 ,4 ]
Zhang Q. [1 ]
机构：
[1] Institute of Flexible Composite Materials, Hexi University, Zhangye, 734000, Gansu
[2] The State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai
[3] Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, 19716, DE
[4] Key Laboratory of Hexi Corridor Resources and Utilization of Gansu, Hexi University, Zhangye, 734000, Gansu
来源：
Huagong Xuebao/CIESC Journal | 2019年 / 70卷 / 09期
关键词：
Biochar; Flexibility; Maize straw; Solid gel electrolyte; Supercapacitor;
D O I：
10.11949/0438-1157.20190162
中图分类号：
学科分类号：
摘要：
In our present work, a typical biomass, maize straw was used as precursor to prepare porous biochar under high temperature followed with etching by KOH solution. The prepared biochar was characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and Raman spectroscopy (Raman). The specific surface area of as-prepared biochar was calculated by the Brunauer-Emmett-Teller (BET) method. Under the optimal conditions, the specific surface area can reach 1228 m²•g-1. Then the as-prepared biochar was employed as electrode materials to fabricate the flexible supercapacitor cooperating with the H2SO4/PVA gel as electrolyte. The electrochemical capacitance properties of the obtained supercapacitors were tested by cyclic voltammetry (CV) constant current charge-discharge (CD) and AC impedance spectroscopy (EIS) measurements in a two-electrode system. The results showed that the specific capacity reaches 125 F•g-1 when the current density is 1.0 A•g-1. Noteworthily, the fabricated supercapacitor demonstrates the perfectly flexibility and stability that the capacitance retention kept at 93.5% under different bending angles (from 0° to 180°) at a constant current density of 1.0 A•g-1. Furthermore, the flexible supercapacitor also exhibits a satisfied long-term stability performance of 95.6% capacitance retention and 94.9% coulombic efficiency under 180° bending angle through 500 cycles. These very attractive mechanical properties and electrochemical performances enable this flexible supercapacitor to present a great potential for wearable devices as energy storage equipment and open up new avenues to high-value materials from waste maize straw. © All Right Reserved.
引用
收藏
页码：3590 / 3600
页数：10
相关论文
共 46 条
  • [1] Zhang Q.F., Uchaker E., Candelaria S.L., Et al., Nanomaterials for energy conversion and storage, Chem. Soc. Rev., 42, 7, pp. 3127-3171, (2013)
  • [2] Liu M.X., Miao L., Lu W.J., Et al., Porous carbon materials: design, synthesis and applications in energy storage and conversion devices, Chin. Sci. Bull., 62, 6, pp. 590-605, (2017)
  • [3] Chen X.L., Qiu L.B., Peng H.S., Et al., Novel electric double-layer capacitor with a coaxial fiber structure, Adv. Mater., 25, 44, pp. 6436-6441, (2013)
  • [4] Beidaghi M., Gogotsi Y., Capacitive energy storage in micro-scale devices: recent advances in design and fabrication of micro-supercapacitors, Energy & Environ. Sci., 7, 3, pp. 867-884, (2014)
  • [5] Bae J., Song M.K., Park Y.J., Et al., Fiber supercapacitors made of nanowire-fiber hybrid structures for wearable/flexible energy storage, Angew. Chem. Int. Ed., 50, 7, pp. 1683-1687, (2011)
  • [6] Yan J., Qian W., Tong W., Et al., Recent advances in design and fabrication of electrochemical supercapacitors with high energy densities, Adv. Energy. Mater., 4, 4, (2014)
  • [7] Cheng Y.W., Zhang H.B., Lu S.T., Et al., Flexible asymmetric supercapacitors with high energy and high power density in aqueous electrolytes, Nanoscale, 5, 3, pp. 1067-1073, (2013)
  • [8] Kotz R., Carlen M., Principles and applications of electrochemical capacitors, Electrochimica Acta, 45, pp. 2483-2498, (2000)
  • [9] Wang Y.G., Song Y.F., Xia Y.Y., Electrochemical capacitors: mechanism, materials, systems, characterization and applications, Chem. Soc. Rev., 45, 21, pp. 5925-5950, (2016)
  • [10] Conway B.E., Pell W.G., Double-layer and pseudocapacitance types of electrochemical capacitors and their applications to the development of hybrid devices, J. Solid. State. Electr., 7, 9, pp. 637-644, (2003)
12345