Journal
CHEMELECTROCHEM
Volume 4, Issue 12, Pages 3302-3308Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201700690
Keywords
sodium-ion capacitors; nickel hexacyanoferrate; intercalation capacitance; energy density
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Funding
- National Research Foundation of Korea (NRF) - Korea Government [NRF-2017R1C1B2012784]
- National Research Foundation of Korea [22A20152913424] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Sodium-ion capacitors have received much attention compared to lithium-based systems, owing to the improved safety and earth abundancy. Here, we assembled an aqueous sodium-ion capacitor by using nickel hexacyanoferrate and graphene as positive and negative electrodes, respectively, in 1 M Na2SO4 electrolyte. The fabricated capacitor can work in a wide potential window from 0 to 2 V, giving an energy density of 39.35 Whkg(-1) with better capacitance retention of about 91%, even after 2000 cycles. Besides, the cost-effective precursors as well as environmentally friendly and earth-abundant electrolytes with high safety will ensure that the fabricated sodium-ion capacitor system is suitable for next-generation energy storage applications.
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