標題: | A Holey Graphene Additive for Boosting Performance of Electric Double-Layer Supercapacitors |
作者: | Huang, Jun-Bin Patra, Jagabandhu Lin, Ming-Hsien Ger, Ming-Der Liu, Yih-Ming Pu, Nen-Wen Hsieh, Chien-Te Youh, Meng-Jey Dong, Quan-Feng Chang, Jeng-Kuei 材料科學與工程學系 Department of Materials Science and Engineering |
關鍵字: | holey structure;graphene nanosheets;nonaqueous electrolyte;composite electrode;volumetric capacitance |
公開日期: | 1-Apr-2020 |
摘要: | We demonstrate a facile and effective method, which is low-cost and easy to scale up, to fabricate holey graphene nanosheets (HGNSs) via ultrafast heating during synthesis. Various heating temperatures are used to modify the material properties of HGNSs. First, we use HGNSs as the electrode active materials for electric double-layer capacitors (EDLCs). A synthesis temperature of 900 degrees C seems to be optimal, i.e., the conductivity and adhesion of HGNSs reach a compromise. The gravimetric capacitance of this HGNS sample (namely HGNS-900) is 56 Fg(-1). However, the volumetric capacitance is low, which hinders its practical application. Secondly, we incorporate activated carbon (AC) into HGNS-900 to make a composite EDLC material. The effect of the AC:HGNS-900 ratio on the capacitance, high-rate performance, and cycling stability are systematically investigated. With a proper amount of HGNS-900, both the electrode gravimetric and volumetric capacitances at high rate charging/discharging are clearly higher than those of plain AC electrodes. The AC/HGNS-900 composite is a promising electrode material for nonaqueous EDLC applications. |
URI: | http://dx.doi.org/10.3390/polym12040765 http://hdl.handle.net/11536/154577 |
DOI: | 10.3390/polym12040765 |
期刊: | POLYMERS |
Volume: | 12 |
Issue: | 4 |
起始頁: | 0 |
結束頁: | 0 |
Appears in Collections: | Articles |