Investigation of Voltage Range and Self‐Discharge in Aqueous Zinc‐Ion Hybrid Supercapacitors
Open Access
- 21 January 2021
- journal article
- research article
- Published by Wiley in ChemSusChem
- Vol. 14 (7), 1700-1709
- https://doi.org/10.1002/cssc.202002931
Abstract
Aqueous zinc‐ion hybrid supercapacitors are a promising energy storage technology, owing to their high safety, low cost, and long‐term stability. At present, however, there is a lack of understanding of the potential window and self‐discharge of this aqueous energy storage technology. This study concerns a systematic investigation of the potential window of this device by cyclic voltammetry and galvanostatic charge–discharge. Hybrid supercapacitors based on commercial activated carbon (AC) demonstrate a wide and stable potential window (0.2 V to 1.8 V), high specific capacitances (308 F g−1 at 0.5 A g−1 and 110 F g−1 at 30 A g−1), good cycling stability (10000 cycles with 95.1 % capacitance retention), and a high energy density (104.8 Wh kg−1 at 383.5 W kg−1), based on the active materials. The mechanism involves simultaneous adsorption–desorption of ions on the AC cathode and zinc ion plating/stripping on the Zn anode. This work leads to better understanding of such devices and will aid future development of practical high‐performance aqueous zinc‐ion hybrid supercapacitors based on commercial carbon materials, thus accelerating the deployment of these hybrid supercapacitors and filling the gap between supercapacitors and batteries.Keywords
Funding Information
- University of Manchester
- Engineering and Physical Sciences Research Council (EP/R023034/1)
This publication has 69 references indexed in Scilit:
- Battery‐Supercapacitor Hybrid Devices: Recent Progress and Future ProspectsAdvanced Science, 2017
- Hierarchical porous microspheres of activated carbon with a high surface area from spores for electrochemical double-layer capacitorsJournal of Materials Chemistry A, 2016
- A Hierarchical Carbon Derived from Sponge‐Templated Activation of Graphene Oxide for High‐Performance Supercapacitor ElectrodesAdvanced Materials, 2016
- Activated Graphene-Based Carbons as Supercapacitor Electrodes with Macro- and MesoporesACS Nano, 2013
- A facile approach for the synthesis of monolithic hierarchical porous carbons – high performance materials for amine based CO2 capture and supercapacitor electrodeEnergy & Environmental Science, 2013
- True Performance Metrics in Electrochemical Energy StorageScience, 2011
- Electrical Energy Storage for the Grid: A Battery of ChoicesScience, 2011
- Carbon-Based Supercapacitors Produced by Activation of GrapheneScience, 2011
- Materials for electrochemical capacitorsNature Materials, 2008
- What Are Batteries, Fuel Cells, and Supercapacitors?Chemical Reviews, 2004