Zhang Juncai, Deng Lingjuan, Liu Zong-Huai
School of Chemistry & Chemical Engineering, Xianyang Normal University Xianyang 712000 P. R. China
Key Laboratory of Applied Surface and Colloid Chemistry, Shaanxi Normal University, Ministry of Education Xi'an 710062 P. R. China.
RSC Adv. 2018 Aug 14;8(51):28987-28996. doi: 10.1039/c8ra04788j.
Preparation of graphene (GR) based electrode materials with excellent capacitive properties is of great importance to supercapacitors. Herein, we report a facile approach to prepare partially reduced graphite oxide (PRG) nanosheets by reducing graphite oxide (GO) using commercial CuO powder as a reduction agent, moreover, we demonstrate that the PRG nanosheets can act as building blocks for assembling hydrogels (PRGH) and flexible film (PRGF). The obtained PRGH and PRGF can be directly used as binder-free electrodes for supercapacitors and give high specific capacitance (292 and 273 F g at a current density of 0.5 A g in a three-electrode system, respectively) due to the existence of oxygen-containing functional groups in PRG nanosheets. PRG also gives excellent rate ability and cycle stability. This study suggests a facile pathway to produce GR-based materials with excellent capacitive properties and is meaningful for flexible supercapacitors.
制备具有优异电容性能的石墨烯（GR）基电极材料对超级电容器至关重要。在此，我们报道了一种简便的方法，通过使用市售CuO粉末作为还原剂还原氧化石墨烯（GO）来制备部分还原的氧化石墨烯（PRG）纳米片，此外，我们证明PRG纳米片可作为构建水凝胶（PRGH）和柔性薄膜（PRGF）的基本单元。所获得的PRGH和PRGF可直接用作超级电容器的无粘结剂电极，由于PRG纳米片中存在含氧官能团，在三电极系统中，在电流密度为0.5 A g时分别具有高比电容（292和273 F g）。PRG还具有优异的倍率性能和循环稳定性。本研究提出了一种制备具有优异电容性能的GR基材料的简便途径，对柔性超级电容器具有重要意义。
