o-Benzenediol-Functionalized Carbon Nanosheets as Low Self-Discharge Aqueous Supercapacitors

ChemSusChem
Ting XiongJunmin Xue

Abstract

Widening the voltage window is often proposed as a way to increase the energy density of aqueous supercapacitors. However, attempting to operate beyond the aqueous supercapacitor stability region can undermine the supercapacitor reliability due to pronounced electrolyte decomposition, which can lead to a significant self-discharge process. To minimize this challenge, charge injection by grafting o-benzenediol onto the carbon electrode is proposed through a simple electrochemical cycling technique. Due to charge injection from o-benzenediol into the carbon electrode, the equilibrium potential of the individual electrode can be reduced. In addition, due to its small molecular size, charge distribution, which is commonly faced by bulk pseudocapacitive materials, is also avoided. The assembled supercapacitor based on the o-benzenediol-grafted carbon demonstrated a maximum energy density of 24 Wh kg-1 and a maximum power density of 69 kW kg-1 , with a retention of 89 % after 10 000 cycles at 10 A g-1 . A low self-discharge of about 4 h was recorded; this could be attributed to the low driving force arising from the lower equilibrium potential. Thus, the proposed technique may provide insight towards the tuning of the equilibrium pot...Continue Reading

References

Dec 25, 2007·Nano Letters·Konstantin N KudinRoberto Car
Jul 23, 2011·Chemical Society Reviews·Guoping WangJiujun Zhang
Jan 28, 2015·Chemical Society Reviews·D P DubalP Gómez-Romero
Apr 22, 2015·Scientific Reports·Zengxin DaiGeorge Z Chen
Jun 9, 2015·Chemical Society Reviews·Cheng ZhongJiujun Zhang
Sep 8, 2016·Nature Communications·Maria R LukatskayaYury Gogotsi

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Citations

Dec 10, 2019·ChemSusChem·Lu LiXitian Zhang
Dec 19, 2019·Nano-micro Letters·Ting XiongJunmin Xue
Jun 27, 2020·Nano Letters·Buddha Deka BoruahMichael De Volder

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