Journal
CARBON
Volume 174, Issue -, Pages 173-179Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.12.034
Keywords
Free-standing electrode; Oxygen functional groups; Holey; Potassium-ion batteries
Funding
- National Natural Science Foundation of China [51572078, 51772086, 51872087, 51971089]
- Natural Science Foundation of Hunan Province [2018JJ2038, 2020JJ5021]
- Major Science and Technology Program of Changsha [kq1804010]
- Outstanding Youth Project of Hunan Provincial Education Department [18B436]
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A redox-active engineered holey reduced graphene oxide film anode was prepared using carboxylic acid functionalized polystyrene spheres as a template, which greatly enhanced the electrochemical performance for potassium-ion batteries. The optimized film exhibited superior areal capacity and improved charge/discharge performance in KIBs.
Graphene film is promising candidate as free-standing electrodes for potassium-ion batteries (KIBs) owing to its intrinsic nature of mechanical strength and high electrical conductivity. However, its performance is usually restricted by the tightly stacked structure and sluggish insertion/deinsertion K storage mechanism. Herein, a redox-active engineered holey reduced graphene oxide (HRGO) film anode was prepared by using the carboxylic acid functionalized polystyrene (PS-COOH) spheres as the template. The holey ion diffusion network channels and the oxygen functional groups can be optimized during the PS-COOH spheres decomposition process, which largely promote the enhancement of electrochemical performance because the oxygen functional groups can serve as the surface-redox sites increasing surface-driven reactions and holey channels provide more ion-accessible area for K-ion storage. Moreover, the reduction degree of graphene oxide also be simply tuned by changing the annealing temperature, which can improve the K+ bulk intercalation reaction. As a result, the optimized HRGO-900 (HRGO sample obtained at 900 degrees C) films exhibits a superior areal capacity (0.80 mAh cm(-2) at 0.1 mA cm(-2)). The electrode design and construction strategies can be effectively applied in other 2D materials, which exhibits practical applications in energy storage devices. (C) 2020 Elsevier Ltd. All rights reserved.
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