Ternary molybdenum sulfoselenide based hybrid nanotubes boost potassium-ion diffusion kinetics for high energy/power hybrid capacitors
Journal of Materials Chemistry A 8(28):13946-13954 Jul 2020 

Gao, Jingyu; Wang, Gongrui; Liu, Yi; Li, Jie; Peng, Bo; Jiao, Shuhong; Zeng, Suyuan; Zhang, Genqiang


Ternary MoS2−xSex/carbon hybrid nanotubes (denoted as MoS2−xSex/C-HNTs) with a unique disordered layer structure and expanded interplanar spacing were synthesized through a facile two-step method involving oxidative polymerization coating and subsequent thermal annealing treatment using an Sb2S3 nanowire template, and they delivered excellent K+ storage performance. The higher diffusion coefficient, excellent structural robustness and disordered layer structure could be the possible reasons for the enhanced performance with a high capacity of 237.0 mA h g−1 after 300 cycles at 0.5 A g−1, which is supported by ex situ XRD, Raman spectroscopy and GITT measurements. Importantly, the prominent performance of a potassium-ion hybrid capacitor (KIHC) based on the MoS2/3Se4/3/C-HNT anode and a commercial activated carbon (AC) cathode demonstrates its great potential for future practical applications.


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