標題: | Nanosized MnO2 spines on Au stems for high-performance flexible supercapacitor electrodes |
作者: | Chen, Yu-Liang Chen, Po-Chin Chen, Tze-Lung Lee, Chi-Young Chiu, Hsin-Tien 應用化學系 Department of Applied Chemistry |
公開日期: | 2013 |
摘要: | Electrodes composed of ultrathin MnO2 (thickness 5-80 nm) spines on Au nanowire (NW) stems (length 10-20 mu m, diameter 20-100 nm) were electrochemically grown on flexible polyethylene terephthalate (PET) substrates. The electrodes demonstrated high specific capacitance, high specific energy value, high specific power value, and long-term stability. In Na2SO4(aq.) (1 M), the maximum specific capacitance was determined to be 1130 F g(-1) by cyclic voltammetry (CV, scan rate 2 mV s(-1)) using a three-electrode system. From a galvanostatic (GV) charge/discharge test using a two-electrode system, a maximum capacitance of 225 F g(-1) (current density 1 A g(-1)) was measured. Even at a high charge/discharge rate of 50 A g(-1), the specific capacitance remained at an extremely high value of 165 F g(-1). The flexible electrodes also exhibited a maximum specific energy of 15 W h kg(-1) and a specific power of 20 kW kg(-1) at 50 A g(-1). After five thousand cycles at 10 A g(-1), 90% of the original capacitance was retained. A highly flexible solid-state device was also fabricated to reveal its supercapacitance performance. |
URI: | http://hdl.handle.net/11536/22906 http://dx.doi.org/10.1039/c3ta12911j |
ISSN: | 2050-7488 |
DOI: | 10.1039/c3ta12911j |
期刊: | JOURNAL OF MATERIALS CHEMISTRY A |
Volume: | 1 |
Issue: | 42 |
起始頁: | 13301 |
結束頁: | 13307 |
顯示於類別: | 期刊論文 |