High Voltage Supercapacitor with Asymstric Graphene Nanowall Electrodes

Kun-Ping Huang, Yu-Wen Chi, Da-Je Hsu, Meng-yu Tsai, Su-Chih Hsu, Ming-Hui Hu, Chung-Hao Hsu, Zuo-Jhang Wu, Ying-Jhih Jhou & Chi-Chang Hu
The plasma-enchanced chemical vapor deposition (PECVD) tool was used to grow graphene nanowalls (GNWs) and nitrogen-doped graphene nanowalls (NGNWs) on titanium substrate. Two identical GNW/ Ti electrodes were assembled in asymmetric electrical double layer capacitors (EDLC). Meanwhile, the asymmetric EDLC consisted of a positive GNW/Ti electrode and a negative NGNW/Ti electrode. The binder-free, vertically grown GNW and NGNW electrodes respectively provided good examples for extending the upper potential limit of a positive electrode of EDLCs...
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