4 years ago

A High-Energy Aqueous Sodium-Ion Capacitor with Nickel Hexacyanoferrate and Graphene Electrodes

A High-Energy Aqueous Sodium-Ion Capacitor with Nickel Hexacyanoferrate and Graphene Electrodes
Surjit Sahoo, Sang Jae Kim, Kyung Hyun Choi, Parthiban Pazhamalai, Karthikeyan Krishnamoorthy, Jong Hwan Lim
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 Wh kg−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. Under construction: An aqueous sodium-ion hybrid capacitor using nickel hexacyanoferrate and graphene electrodes is constructed and the electrochemical performances are examined with neutral electrolyte.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/celc.201700690

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