| Title | Electrolyte-assisted hydrothermal synthesis of holey graphene films for all-solid-state supercapacitors |
| Authors | Liu, Daoqing Li, Qianwei Zhao, Huazhang |
| Affiliation | Peking Univ, Dept Environm Engn, Beijing 100871, Peoples R China. Minist Educ, Key Lab Water & Sediment Sci, Beijing 100871, Peoples R China. China Univ Petr, Beijing Key Lab Oil & Gas Pollut Control, State Key Lab Heavy Oil Proc, 18 Fuxue Rd, Beijing 102249, Peoples R China. Peking Univ, Dept Environm Engn, Beijing 100871, Peoples R China. Zhao, HZ (reprint author), Minist Educ, Key Lab Water & Sediment Sci, Beijing 100871, Peoples R China. |
| Keywords | VOLUMETRIC-PERFORMANCE SUPERCAPACITORS ELECTROCHEMICAL ENERGY-STORAGE FLEXIBLE SUPERCAPACITORS OXIDE-FILMS COMPOSITE FILMS NEXT-GENERATION HYBRID FILM CARBON CAPACITORS PAPER |
| Issue Date | 2018 |
| Publisher | JOURNAL OF MATERIALS CHEMISTRY A |
| Citation | JOURNAL OF MATERIALS CHEMISTRY A. 2018, 6(24), 11471-11478. |
| Abstract | A novel strategy was presented for the synthesis of graphene-based film electrodes by electrolyte-induced hydrothermal reduction of holey graphene oxide based films. After hydrothermal treatment, the reduced holey graphene films (rHGFs) maintained their flexibility, integrity and porosity, which resulted from the electrolyte-induced balance between electrostatic repulsion and - attraction. The trapped electrolyte (H2SO4) between graphene layers can prevent aggregation, and the resulting supercapacitor exhibits a high specific capacitance in the sulfuric acid electrolyte. Benefitting from the in-plane pores and oxygen-containing groups on graphene sheets, the rHGF electrode exhibits a high specific capacitance of 260 F g(-1) (297 F cm(-3)) with remarkable rate performance in a three-electrode system. To evaluate the practical application, flexible all-solid-state supercapacitors based on the rHGF electrode with PVA/H2SO4 gel electrolyte were prepared, and the device exhibits remarkable cycling stability. The areal capacitance and volumetric energy density were 56 mF cm(-2) and 1.41 W h cm(-3), respectively. This work demonstrated a cost-effective and simple technique to prepare compact graphene films with continuous ion channels and showed great importance on the design of flexible, portable and highly integrated supercapacitors. |
| URI | http://hdl.handle.net/20.500.11897/523578 |
| ISSN | 2050-7488 |
| DOI | 10.1039/c8ta02580k |
| Indexed | SCI(E) EI |
| Appears in Collections: | 环境科学与工程学院 |
