Two steps synthesis approach of MnO2/graphene nanoplates/graphite composite electrode for supercapacitor application. (March 2017)

• Record Type: Journal Article
• Authors: Rashed, A.E.; El-Moneim, A.A.
• Is Part Of: Materials today energy. Volume 3(2017)
• Page Start: 24
• Page End: 31
• Publication Date: 2017-03
• Subjects: Composite electrode -- Capacitor -- Specific capacitance -- Structure -- Cycle life; Energy development -- Periodicals; Energy industries -- Periodicals; Power resources -- Periodicals; Energy policy -- Periodicals; Energy development; Energy industries; Energy policy; Power resources; Electronic journals; Periodicals; 621.042
• DOI: 10.1016/j.mtener.2017.02.004
• Languages: English
• ISSNs: 2468-6069

Abstract

Abstract: MnO2 /GNPs-PVDF/graphite capacitive electrode is prepared by two steps synthesis approach, where low cost graphene nanoplates (GNPs) which show the benefits of single-layer graphene and highly graphitic carbon, are initially mixed with 8 wt% polyvinylidene fluoride (PVDF) binder polymeric solution via a slurry procedure. Slurry of GNPs-PVDF composite is then pasted and pressed onto a flexible graphite substrate for the post anodic deposition of thin MnO2 film with relaxed structure. The MnO2 film deposited on GNPs-PVDF/graphite support shows better capacitive performance than that obtained by direct deposition on graphite substrate or those reported for counter electrodes prepared by one pot synthesis, as it exhibits specific capacitance (SC) of 855 F g -1 at 1.3 mA cm −2, excellent rate capability and most importantly, maintains capacitance retention (CR) of 105% after 2000 cycles of charging and discharging at 3.8 mA cm −2 . This unique capacitive performance is attributed to the facilitation of ion accessibility and electron transfer through the MnO2 film, which stabilized by MnO2 -GNPs bond interaction. If considering that GNPs can be easily mass produced from graphite; the structural stability and excellent capacitive performance suggest that MnO2 /GNPs-PVDF composite supported on flexible graphite substrate is a promising electrode material for future energy storage applications. Highlights: Low cost GNPs were used with PVDF binder to tailor 3D conductive GNPs-PVDF support. MnO2 film with 3D relaxed structure was anodically deposited on GNPs-PVDF support. GNPs supported facile ion and electron transfer and MnO2 -carbon bond interaction. The MnO2 film showed SC of 855 F g -1 and CR of 105% after 2000 cycles at 4 mA cm −2 .