التفاصيل البيبلوغرافية
| العنوان: |
Improving the energy density of quasi-solid-state supercapacitors by assembling two redox-active gel electrolytes. |
| المؤلفون: |
Fan, Le-Qing1 leqingfan@163.com, Zhong, Ji1, Zhang, Can-Yang1, Wu, Ji-Huai1 jhwu@hqu.edu.cn, Wei, Yue-Lin1 |
| المصدر: |
International Journal of Hydrogen Energy. Apr2016, Vol. 41 Issue 13, p5725-5732. 8p. |
| مصطلحات موضوعية: |
*ENERGY density, *VANADYL sulfate, *SODIUM molybdate, *SUPERCAPACITORS, *POLYELECTROLYTES, *OXIDATION-reduction reaction, *POLYVINYL alcohol |
| مستخلص: |
Redox additives of VOSO 4 and Na 2 MoO 4 were respectively added into two polyvinyl alcohol (PVA)–H 2 SO 4 gels to form two gel polymer electrolytes (GPEs). These two redox-active GPEs were separated by a Nafion 117 membrane and assembled with a pair of activated carbon electrodes to construct quasi-solid-state supercapacitors, in which PVA–H 2 SO 4 –VOSO 4 and PVA–H 2 SO 4 –Na 2 MoO 4 GPEs worked on the sides of the negative and positive electrodes of the supercapacitor, respectively. Cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy techniques were used to evaluate the electrochemical performances of the supercapacitor with optimized PVA–H 2 SO 4 –VOSO 4 and PVA–H 2 SO 4 –Na 2 MoO 4 GPEs. After the introduction of VOSO 4 and Na 2 MoO 4 , the specific capacitance and energy density of the supercapacitor with PVA–H 2 SO 4 –VOSO 4 |PVA–H 2 SO 4 –Na 2 MoO 4 GPEs can reach 543.4 F g −1 and 17.9 Wh kg −1 , respectively, which are about four times those of the supercapacitor with a PVA–H 2 SO 4 GPE. The enhanced energy storage is attributed to the reversible Faradaic reactions related to VOSO 4 and Na 2 MoO 4 in the corresponding gel polymer electrolytes. In addition, the supercapacitor shows good cyclic durability. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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