Ultrathin MoS2 flakes embedded in nanoporous graphene films for a multi-functional electrode. Issue 2 (5th January 2021)

• Record Type: Journal Article
• Authors: Kim, Sung-Wook; Hwang, Jongha; Ha, Seong-Ji; Lee, Jae-Eun; Yoon, Jong-Chul; Jang, Ji-Hyun
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 2(2021)
• Page Start: 928
• Page End: 936
• Publication Date: 2021-01-05
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta10397g
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : The ultrathin few-layer MoS2 sheets directly grown on a nanoporous graphene film (MoS2 /NGF), which successfully addressed the shortcomings of bulk MoS2 for multi-functional electrodes. Abstract : Molybdenum disulfide (MoS2 ) is considered a promising material in energy storage systems, and is thus drawing considerable attention. However, the relatively low conductivity of bulk MoS2 has been a threat for practical applications. This study developed a simple and scalable fabrication method of few-layer MoS2 sheets embedded in a nanoporous graphene film (NGF) as a high capacitance active material. Transfer of MoS2 /NGF onto a flexible substrate followed by plotter cutting produced a highly efficient micro-supercapacitor with superior flexibility, mechanical stability, and great potential for applications in wearable electronics. Notably, MoS2 /NGF-based mSC revealed a high volumetric capacitance of 55 F cm −3 and 82.2% of capacitance retention after 20 000 cycles, which are superior to the reported data for solid-state micro-supercapacitors. With these performances, the flexible MoS2 /NGF mSC exhibited an ultrahigh energy density of 7.64 mW h cm −3 and power density of 9.96 W cm −3 in a H3 PO4 gel polymer electrolyte. The high volumetric capacitance and energy/power densities of MoS2 /NGF as micro-supercapacitor electrodes are due to direct growth of ultra-thin MoS2 onto the interconnected 3D nanoporous graphene film with extended active sites and good conductivity. The MoS2 /NGF mSC integrated on the skin efficiently powered a light emitting diode and strain sensors. This work suggests a meaningful way to realize film type MoS2 active materials in flexible micro-supercapacitors for wearable applications.