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Abstract
Preparation of pure three-dimensional graphene (3DG) with high rate performance for supercapacitors is critical for fast rate charge/discharge. Here, 3DG was prepared via thermal annealing of freeze-dried reduced graphene oxide (RGO) hydrogel under inert gas protection. The formed 3DG as an electrode material for supercapacitors revealed a specific capacitance of 115 F·g−1 at a current density of 1 A·g−1, and a high capacitance retention of 70% as current density increased to 40 A·g−1. The excellent rate capability was mainly attributed to the reserved porous structure and higher electrical conductivity for 3DG after thermal reduction than its RGO hydrogel precursor.
Highlights
Three-dimensional graphene (3DG) with a large surface area, high electrical conductivity, and a tailorable porous structure is an ideal electrode material and conductive scaffold for supercapacitors [1,2,3]
Preparation of pure three-dimensional graphene (3DG) with high rate performance for supercapacitors is critical for fast rate charge/discharge
The excellent rate capability was mainly attributed to the reserved porous structure and higher electrical conductivity for 3DG after thermal reduction than its reduced graphene oxide (RGO) hydrogel precursor
Summary
Three-dimensional graphene (3DG) with a large surface area, high electrical conductivity, and a tailorable porous structure is an ideal electrode material and conductive scaffold for supercapacitors [1,2,3]. It was mainly due to aggregation and stacking of graphene sheets, largely reducing the specific surface area, which was difficult to avoid [14]. In consideration of this situation, one effective method was to prepare various composites based on 3DG via loading active electrode materials onto the 3DG framework, including transition metal compounds [15,16,17,18,19] and conducting polymers [20,21], etc. The specific capacitance for pure 3DG decreased greatly with increasing charge/discharge current density, especially for reduced graphene oxide (RGO) hydrogel [27]. The excellent rate performance was mainly due to the intact porous structure and enhanced the electrical conductivityof3DG, compared with its RGO hydrogel precursor
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