Journal ArticleDOI
Co9S8 nanoflakes on graphene (Co9S8/G) nanocomposites for high performance supercapacitors
Rajendran Ramachandran,M. Saranya,Chella Santhosh,V. Velmurugan,Bala P.C. Raghupathy,Soon Kwan Jeong,Andrews Nirmala Grace +6 more
Reads0
Chats0
TLDR
In this article, the structural, morphological and physical properties of Co9S8/graphene nanocomposites were analyzed by X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), XPS, and thermogravimetric analysis (TGA).Abstract:
Co9S8/graphene nanocomposites (Co9S8/G) at various concentrations of graphene and Co9S8 were prepared by a simple chemical route from cobalt nitrate and graphene as precursors in the presence of PVP as surfactant and thioacetamide (TAA) as sulfur source. To gain knowledge about the structural, morphological and physical properties, the composite material was analyzed by X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS) and thermogravimetric Analysis (TGA). SEM measurements showed the presence of well dispersed, ∼300 nm sized Co9S8 nanoflakes. To assess the properties of the nanocomposites for their applicability in supercapacitors, electrochemical analysis was carried out in 6 M KOH electrolyte. A maximum specific capacitance of 808 F g−1 was observed for Co9S8/G-d at 5 mV s−1 scan rate. Galvanostatic charge–discharge curves showed the excellent cyclic stability of Co9S8/G-d composite with higher charge–discharge duration than pure Co9S8. The excellent electrochemical performance of the composite could be due to the better electrical conductivity behavior of graphene on Co9S8 nanoflakes.read more
Citations
More filters
Journal ArticleDOI
Mesoporous Thorn‐Covered Core–Shell Cathode and 3D Reduced Graphene Oxide Aerogel Composite Anode with Conductive Multivalence Metal Sulfides for High‐Performance Aqueous Hybrid Capacitors
Journal ArticleDOI
A facile one-pot hydrothermal synthesis of Co9S8/Ni3S2 nanoflakes for supercapacitor application
TL;DR: In this article, a Co9S8/Ni3S2 nanoflakes have been successfully designed and constructed on a nickel foam substrate via a simple one-pot hydrothermal synthesis.
Journal ArticleDOI
A partial sulfidation approach that significantly enhance the activity of FeCo layered double hydroxide for oxygen evolution reaction
Xianshu Qiao,Kang Hongjun,Jinzhu Wu,Yang Li,Qun Wang,Xin Jia,Yadong Qiao,Songtao Lu,Xiaohong Wu,Wei Qin +9 more
TL;DR: In this article, a partial sulfidation approach was used to boost the OER activity of FeCo-layered double hydroxides (LDH) nanosheets.
Journal ArticleDOI
Synthesis of poly(m-phenylenediamine)-coated hexagonal Co9S8 for high-performance supercapacitors
TL;DR: In this paper, a poly(m-phenylenediamine)-coated hexagonal Co9S8 was firstly synthesized by the polymerization with self-prepared Co(OH)2 used as cobalt source, and the calcination with sulfur powder providing sulfur source.
References
More filters
Journal ArticleDOI
Synthesis of graphene-based nanosheets via chemical reduction of exfoliated graphite oxide
Sasha Stankovich,Dmitriy A. Dikin,Richard D. Piner,Kevin A. Kohlhaas,Alfred Kleinhammes,Yuanyuan Jia,Yue Wu,SonBinh T. Nguyen,Rodney S. Ruoff +8 more
TL;DR: In this paper, a colloidal suspension of exfoliated graphene oxide sheets in water with hydrazine hydrate results in their aggregation and subsequent formation of a high surface area carbon material which consists of thin graphene-based sheets.
Journal ArticleDOI
Processable aqueous dispersions of graphene nanosheets
TL;DR: It is reported that chemically converted graphene sheets obtained from graphite can readily form stable aqueous colloids through electrostatic stabilization, making it possible to process graphene materials using low-cost solution processing techniques, opening up enormous opportunities to use this unique carbon nanostructure for many technological applications.
Journal ArticleDOI
Supercapacitor devices based on graphene materials
TL;DR: In this paper, a supercapacitor with a maximum specific capacitance of 205 F/g with a measured power density of 10 kW/kg at energy density of 28.5 Wh/kg in an aqueous electrolyte solution has been obtained.
Journal ArticleDOI
Catalyst-Free Synthesis of Nitrogen-Doped Graphene via Thermal Annealing Graphite Oxide with Melamine and Its Excellent Electrocatalysis
TL;DR: A facile, catalyst-free thermal annealing approach for large-scale synthesis of NG using low-cost industrial material melamine as the nitrogen source is proposed, which can completely avoid the contamination of transition metal catalysts, and thus the intrinsic catalytic performance of pure NGs can be investigated.
Journal ArticleDOI
Facile synthesis and characterization of graphene nanosheets
TL;DR: Graphene nanosheets were produced in large quantity via a soft chemistry synthetic route involving graphite oxidation, ultrasonic exfoliation, and chemical reduction in this paper.