Oxygen Nucleation of MoS2 Nanosheet Thin Film Supercapacitor Electrodes for Enhanced Electrochemical Energy Storage
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
Author(s)
Related Research Unit(s)
Detail(s)
Original language | English |
---|---|
Pages (from-to) | 2882-2891 |
Journal / Publication | ChemSusChem |
Volume | 14 |
Issue number | 14 |
Online published | 20 May 2021 |
Publication status | Published - 22 Jul 2021 |
Link(s)
Abstract
A direct thin film approach to fabricate large-surface MoS2 nanosheet thin film supercapacitors using the solution-based diffusion of thiourea into an anodized MoO3 thin film was investigated. A dense MoS2 nanosheet thin film electrode (D-MoS2) was obtained when the anodized MoO3 thin film was processed in a low thiourea solution concentration, whereas a highly porous MoS2 nanosheet thin film electrode (P-MoS2) was formed at a higher thiourea solution concentration. The charge storage performances of the D-MoS2 and P-MoS2 thin films displayed an unusual increase in capacitance on extended cycling, leading to a capacitance as high as around 5–8 mF cm−2. X-ray diffraction and cross-sectional microscopy revealed the capacitance enhancements of the MoS2 supercapacitors are attributable to the nucleation of a new MoS2-xOx phase upon cycling. For the D-MoS2 nanosheet thin film, the formation and growth of the MoS2-xOx phase during cycling was accompanied by a volumetric expansion of the MoS2 layer. For the P-MoS2 thin film, the nucleation and growth of the MoS2-xOx phase occurred in the pores of the MoS2 layer. The propagation of the MoS2-xOx phase also shifted the charge storage process in both films from a diffusion-limited process to a capacitive-dominant process.
Research Area(s)
- 2D materials, anodization, MoS2, supercapacitor, thin film
Citation Format(s)
Oxygen Nucleation of MoS2 Nanosheet Thin Film Supercapacitor Electrodes for Enhanced Electrochemical Energy Storage. / Nee Lou, Shi; Choon Heng See, Melvin; Lim, Sean; Sharma, Neeraj; Scott, Jason; Wang, Da-Wei; Amal, Rose; Hau Ng, Yun.
In: ChemSusChem, Vol. 14, No. 14, 22.07.2021, p. 2882-2891.Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review