|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Materials for Energy Conversion and Storage
||B-27: High Capacitance Low-crystalline Iron Oxide Hydroxide Anodes for High-energy Density Supercapacitors
||Kwadwo Asare Owusu, Longbing Qu, Liqiang Mai
|On-Site Speaker (Planned)
||Kwadwo Asare Owusu
Supercapacitors are gradually gaining prominence as high-power sources; however, their use is severely limited by the low energy density, which is some orders of magnitude lower than lithium batteries. Designing asymmetric supercapacitors comprising of pseudocapacitive cathodes and carbon anodes have been adopted as an effective strategy to address this problem. However, the energy density of full supercapacitors is still limited by the low capacitances of the carbon anodes. Replacing carbon anodes with pseudocapacitive anodes would further increase the energy density. However, pseudocapacitive electrodes especially suffer from low conductivities making it highly challenging to achieve high capacitances, excellent rate capability, outstanding rate capability and long-term cyclability. On this regard, we report a high-performance low-crystalline FeOOH anode for high-energy density supercapacitors with excellent electrochemical performance at low and high mass loadings. The excellent electrochemical performance is attributed to a capacitive dominant charge storage mechanism. A hybrid supercapacitor also exhibits high energy density.