Freestanding 1T‐MnxMo1–xS2–ySey and MoFe2S4–zSez Ultrathin Nanosheet‐Structured Electrodes for Highly Efficient Flexible Solid‐State Asymmetric Supercapacitors. Issue 23 (6th May 2020)

• Record Type: Journal Article
• Authors: Pan, Uday Narayan; Sharma, Vikas; Kshetri, Tolendra; Singh, Thangjam Ibomcha; Paudel, Dasu Ram; Kim, Nam Hoon; Lee, Joong Hee
• Is Part Of: Small. Volume 16:Issue 23(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-05-06
• Subjects: 1T MoS2 nanosheets -- Fe3S4 nanosheets -- flexible supercapacitors -- hierarchical nanosheets -- solid‐state; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202001691
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: Fabrication of hierarchical nanosheet arrays of 1T phase of transition‐metal dichalcogenides is indeed a critical task, but it holds immense potential for energy storage. A single‐step strategy is employed for the fabrication of stable 1T‐Mn x Mo1– x S2– y Se y and MoFe2 S4– z Se z hierarchical nanosheet arrays on carbon cloth as positive and negative electrodes, respectively. The flexible asymmetric supercapacitor constructed with these two electrodes exhibits an excellent electrochemical performance (energy density of ≈69 Wh kg −1 at a power density of 0.985 kW kg −1 ) with ultralong cyclic stability of ≈83.5% capacity retention, after 10 000 consecutive cycles. Co‐doping of the metal and nonmetal boosts the charge storage ability of the transition‐metal chalcogenides following enrichment in the metallic 1T phase, improvement in the surface area, and expansion in the interlayer spacing in tandem, which is the key focus of the present study. This study explicitly demonstrates the exponential enhancement of specific capacity of MoS2 following intercalation and doping of Mn and Se, and Fe2 S3 following doping of Mo and Se could be an ideal direction for the fabrication of novel energy‐storage materials with high‐energy storage ability. Abstract : A single‐step fabrication of 1T‐Mn x Mo1− x S2− y Se y and MoFe2 S4− z Se z nanosheet arrays based high‐performance flexible and solid‐state asymmetric supercapacitor (FS‐ASC) is reported. FS‐ASC shows high energy density and power density compared to contemporary reported transition‐metal dichalcogenides based supercapacitor due to increase in surface area, enrichment of 1T phase, and expansion in the interlayer spacing following co‐doping and intercalation of metal and nonmetals .