About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Porous Materials for Energy and Environment Applications
|
| Presentation Title |
Microscopic 3D Graphene for High-Performance Supercapacitors with Ultra-High Areal Capacitance |
| Author(s) |
Viet Hung Pham, Congjun Wang, Yuan Gao, Jennifer Weidman, Ki-Joong Kim, Christopher Matranga |
| On-Site Speaker (Planned) |
Viet Hung Pham |
| Abstract Scope |
Despite graphene being considered as an ideal supercapacitor electrode material, its use in commercial devices is limited because few methods exist to produce high-quality graphene at large scale and low-cost. We report a simple method to synthesize 3D graphene by graphenization of coal tar pitch with a K2CO3 catalyst. This produces 3D graphenes with high specific surface areas up to 2113 m2 g-1 and exceptional crystallinity (Raman ID/IG as low as ~ 0.15). The material has an outstanding specific capacitance of 182.6 F g-1 at a current density of 1.0 A g-1. This occurs at mass loading of 30 mg cm-2 which is 3 times higher than commercial requirements, yielding an ultra-high areal capacitance of 5.48 F cm-2. Moreover, the K2CO3 is recycled and reused over 10 cycles. The synthesis method and resulting electrocapacitive performance properties create new opportunities for using 3D graphene more broadly in practical supercapacitor devices. |