Teak wood derived porous carbon: An efficient cathode material for zinc‐ion hybrid supercapacitor

Abstract

An appealing choice for energy storage system that merges the advantages of zinc‐ion battery with supercapacitor is the zinc‐ion hybrid supercapacitor (ZHS). Carbonaceous materials have recently received significant attention as the viable cathode material for ZHS. Carbon‐based materials having large surface area and suitable pore structure exhibit fast kinetics and good charge storage behavior in ZHS. Carbonization temperature plays a vital role in optimizing surface area and developing the pore structure of the carbon. Activated carbon is successfully prepared from teak wood at different carbonization temperatures of ~600°C, 750°C, and 900°C, followed by KOH activation. The teak wood‐derived material carbonized at ~750°C (ATC2) shows the highest specific surface area of ~898.16 m2 g−1. Fabricated ZHS with ATC2 as cathode delivers the highest specific capacitance of ~116 F g−1 at 0.5 A g−1 and exhibits outstanding capacitance retention of ~102.8% after 10 000 continuous galvanostatic charge‐discharge cycles recorded at 10 A g−1. In addition, the device shows ~42 W h kg−1 energy density at ~408 W kg−1 power density. The fabricated ZHS can power an LED and a digital clock, suggesting its potential application as energy storage device.

Effect of Thermal Activation on the Structure and Electrochemical Properties of Carbon Material Obtained from Walnut Shells

“…Also, one of the most common sources of biomass for obtaining PCM is wood, which contains a large amount of cellulose and lignin, which allow for obtaining PCM with high porosity. [ 30 , 31 ]. Due to the open-pore structure, the optimized PCM exhibits a specific capacity of 286 F/g at 1 A/g and an energy density of 5.63 W·h/kg with a power density of 9213 W/kg in 6 M KOH [ 30 ].…”

Rational Design of Ni-Doped V2O5@3D Ni Core/Shell Composites for High-Voltage and High-Rate Aqueous Zinc-Ion Batteries

“…Among all candidates, aqueous zinc-ion batteries (ZIBs) have received increasing attention as promising candidates for large-scale energy storage devices [ 10 ] due to the apparent advantages of using metallic Zn as the anode, including its high theoretical capacity (5855 mAh cm −3 ) [ 11 ], low redox potential (−0.76 V vs. a standard hydrogen electrode (SHE)) and low-cost benefit from its vast reserve (the cost of Zn (0.5–1.5 USD/lb) is much smaller than that of Li (8–11 USD/lb)) [ 12 , 13 , 14 ]. However, finding suitable cathode materials for high-performance ZIBs has become a top priority [ 15 , 16 , 17 , 18 , 19 ]. Currently, manganese- [ 20 ], vanadium- and Prussian blue analogue (PBA)-based cathodes have been proven to be typical cathode materials for ZIBs [ 21 ].…”