Publication: High performance supercapattery with rGO/TiO2 nanocomposites anode and activated carbon cathode
Date
2019
Authors
Heng I.
Low F.W.
Lai C.W.
Juan J.C.
Amin N.
Tiong S.K.
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier Ltd
Abstract
A hybrid material of reduced graphene oxide/titanium dioxide (rGO/TiO2)was successfully synthesized by facile hydrothermal technique. A different amount of GO ratios at 5%, 10%, 20%, and 30% were loaded with TiO2. It is a well-known fact that porous structure and crystallinity of resultant rGO/TiO2 play a crucial role in synergistic effect which facilitate electron transfer movement and reduce the volume changes during a charge-discharge cycle process. Based on the results obtained, an optimum of 10 wt % GO loading with TiO2 nanocrystals revealed that electrochemical performance achieved the highest specific capacity of 116.70 mAh/g with 0.2 A g?1 among samples. This result inferred that high efficiency of ion diffusion was obtained with low charge transfer resistance between TiO2 nanocrystals and rGO. The supercapattery was assembled in a configuration of optimized 10% rGO/TiO2 nanocomposites as anode while activated carbon as cathode. The result obtained a superior energy density of 54.37 Wh kg?1 at power density of 420.48 W kg?1. Additionally, the specific capacity still remained at 92% for 3000 charging-discharging cycles under a current density of 1 A g?1; hence, good life cycle stability, high specific capacity and low charge transfer resistance of rGO/TiO2 nanocomposites electrode suggested that the prepared materials was a promising anode material for supercapattery application. � 2019 Elsevier B.V.
Description
Activated carbon; Anodes; Cathodes; Charge transfer; Crystallinity; Electric discharges; Graphene; Hybrid materials; Life cycle; Nanocrystals; Oxide minerals; Supercapacitor; Titanium dioxide; Charge transfer resistance; Charge-discharge cycle; Electrochemical performance; High specific capacity; Hydrothermal methods; Hydrothermal techniques; rGO/TiO2; Supercapattery; Reduced Graphene Oxide