High Capacity Adsorption―Dominated Potassium and Sodium Ion Storage in Activated Crumpled Graphene
- High Capacity Adsorption―Dominated Potassium and Sodium Ion Storage in Activated Crumpled Graphene
- 권석준; 이병용; 김명진; 김선경; Jagjit Nanda; 장희동; David Mitlin; 이승우
- graphene; crumpled; defect; adsorption
- Issue Date
- Advanced Energy Materials
- VOL 10, NO 17-1903280
- Structurally and chemically defective activatedcrumbled graphene (ACG) is employed to achieve unique synergy of large reversible potassium (K) and sodium (Na) ion storage capacity with fast charging and extended cyclability. ACG synthesis consists of low temperature spraying of graphene oxide slurry, followed by partial reduction annealing and air activation. For K storage, the reversible capacities are 340 mAh g？1 at 0.04 A g？1, 261 mAh g？1 at 0.5 A g？1, and 210 mAh g？1 at 2 A g？1. For Na storage, the reversible capacities are 280 mAh g？1 at 0.04 A g？1, 191 mAh g？1 at 0.5 A g？1, and 151 mAh g？1 at 2 A g？1. ACG shows a stable intermediate rate (0.5 Ag？1) cycling with both K and Na, with minimal fade after 2800 and 8000 cycles. These are among the most favorable capacity―rate capability―cyclability combinations recorded for potassiumion battery and sodiumion battery carbons. Electroanalytical studies (cyclic voltammetry, galvanostatic intermittent titration technique, bvalue) and
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