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Fe 3 O 4 hard templating to assemble highly wrinkled graphene sheets into hierarchical porous film for compact capacitive energy storage.

Hua FangFanteng MengJi YanGao-Yun ChenLinsen ZhangShide WuShichao ZhangLizhen WangYongxia Zhang
Published in: RSC advances (2019)
Highly wrinkled graphene film (HWGF) with high packing density was synthesized by combining an electrostatically self-assembling process, a vacuum filtration-induced film assembling process and capillary compression. Fe 3 O 4 nanoparticles were used as a low-cost and environment-friendly hard template. Hierarchical porosity and high packing density were achieved with the aid of capillary compression in the presence of Fe 3 O 4 nanoparticles. This strategy enables integration of highly wrinkled graphene sheets to form highly compact carbon electrodes with a continuous ion transport network. The generated HWGF exhibited a high packing density of 1.53 g cm -3 , a high specific surface area of 383 m 2 g -1 and a hierarchically porous structure. The HWGF delivered a high capacitance of 242 F g -1 and 370 F cm -3 at 0.2 A g -1 in 6 M KOH aqueous electrolyte system with excellent rate capability (202 F g -1 and 309 F cm -3 retained at 20 A g -1 ). The capacity retention rate reached 97% after 10 000 cycles at 1 A g -1 . The HWGF-based supercapacitor exhibited a high energy density of 17 W h kg -1 at the power density of 49 W kg -1 . Such high capacitive performances could be attributed to the highly dense but porous graphene assemblies composed of highly wrinkled graphene sheets.
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