One-Step Hydrothermal Synthesis of CoNi2S4 for Hybrid Supercapacitor Electrodes

NANO ◽  
2019 ◽  
Vol 14 (07) ◽  
pp. 1950088 ◽  
Author(s):  
Peng Liu ◽  
Yanwei Sui ◽  
Fuxiang Wei ◽  
Jiqiu Qi ◽  
Qingkun Meng ◽  
...  
Keyword(s):  
Electrode System ◽  
Hybrid Supercapacitor ◽  
Microstructural Study ◽  
Specific Energy Density ◽  
Reduced Graphene ◽  
Efficient Charge ◽  
Spherical Core ◽  
One Step ◽  
High Specific Energy ◽  
Cycling Life

In this study, a simple one-step hydrothermal method was developed to prepare a novel hierarchical CoNi2S4 nanostructure similar to rambutan fruit. The surface microstructural study clearly visualized that the rambutan-like CoNi2S4 consists of nanorods grown directly on the surface of spherical core structures. The close attachment of the nanorods to the spheres increased the active areas of the electrode, which facilitates efficient charge transport from the nanorods to the spherical core structure. CoNi2S4 with a rambutan-like hierarchical structure showed an excellent specific capacitance of 944[Formula: see text]F[Formula: see text]g[Formula: see text] at 1[Formula: see text]A[Formula: see text]g[Formula: see text], considerable rate capacitance (75.6% retention at 10[Formula: see text]A[Formula: see text]g[Formula: see text]) and excellent cycling life (91.1% retention after 5000 circulations) in the three-electrode system. Besides, the assembled hybrid supercapacitor based on CoNi2S4 and reduced graphene oxide exhibited a high specific energy density of 23.58[Formula: see text]Wh[Formula: see text]kg[Formula: see text] at the power density of 800[Formula: see text]W[Formula: see text]kg[Formula: see text].

scholarly journals One-step cathodic electrodeposition of a cobalt hydroxide–graphene nanocomposite and its use as a high performance supercapacitor electrode material

RSC Advances ◽  
2018 ◽  
Vol 8 (47) ◽  
pp. 26818-26827 ◽  
Author(s):  
Seyed Abbas Rahimi ◽  
Parviz Norouzi ◽  
Mohammad Reza Ganjali
Keyword(s):  
High Performance ◽  
Electrode System ◽  
Constant Current ◽  
Cobalt Hydroxide ◽  
Supercapacitor Electrode ◽  
Constant Current Density ◽  
Cathodic Electrodeposition ◽  
Reduced Graphene ◽  
One Step ◽  
Graphene Nanocomposite

In this study, Co(OH)2-reduced graphene oxide has been synthesized using a simple and rapid one-step cathodic electrodeposition method in a two electrode system at a constant current density on a stainless steel plate, and then characterized as a supercapacitive material on Ni foam.

scholarly journals Hydrothermal Synthesis of rGO/PbTiO3 Photocatalyst and Its Photocatalytic H2 Evolution Activity

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Chunyan Wang ◽  
Lianwei Shan ◽  
Dongyuan Song ◽  
Yanwei Xiao ◽  
Jagadeesh Suriyaprakash
Keyword(s):  
Photocatalytic Performance ◽  
H2 Evolution ◽  
X Ray Diffraction ◽  
Hydrothermal Route ◽  
X Ray ◽  
Transmission Electron ◽  
Reduced Graphene ◽  
Efficient Charge ◽  
One Step ◽  
Photocatalytic H2 Evolution

In this letter, we investigated the photocatalytic activity of the newly formed rGO/PbTiO3 composites, which are synthesized by a one-step hydrothermal route. By adjusting the amount of reduced graphene oxide (rGO) (0, 0.15, 0.30, 0.60, and 1.20 wt%) with the PbTiO3, we constructed various photocatalysts for this investigation. The crystal structure and morphology of the various composites were studied by powder X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). Photoelectron spectroscopic study revealed that the band structure of the newly formed composites and efficient charge separation can be obtained by the interfaces of various rGO content. In addition, the photocatalytic performance of the synthesized composites was explored by H2 evolution and rhodamine blue (RhB) degradation. The obtained results indicated that the addition of the appropriate amount of rGO could improve the activity of pure PbTiO3, significantly.

Characteristics of (Fe, M)S2 (M=Co, Ni, Mo) Composite Powders Fabricated by MCP

2007 ◽  
Vol 534-536 ◽  
pp. 17-20
Author(s):  
Woo Hyun Jung ◽  
Dong Kyu Park ◽  
Kwang Chul Jung ◽  
Se Hoon Suck ◽  
In Sup Ahn ◽  
...  
Keyword(s):  
Transition Metal ◽  
Electrode System ◽  
Test Results ◽  
Composite Powders ◽  
Specific Energy Density ◽  
Secondary Battery ◽  
Initial Discharge ◽  
High Specific Energy ◽  
Charge Discharge ◽  
Discharge Test

As the electrodes of secondary battery are made with sulfide composite powders, excellent electrode system of environmental non-toxicity and with high specific energy density and low material cost can be obtained. In this study, the (Fe, M)S2 composite powders was synthesized by mechanochemical processes (MCP) in order to improve of the cycle life in bettery. The formation of pyrite phase appreared at the case which adds nickel, but it was not observed in the case where the transition metal was does not add but the transition metal such as cobalt, molybdenum was added in stead. From charge-discharge test results, the initial discharge capasity of (Fe, Ni)S2 electrode was 845 mAh/g. The initial discharge capasity of (Fe, Co)S2 electrode was 500mAh/g, but it showed a better cycle perfoemance than the case where the diffrent transition metal was added.

Photo-Current Enhancement at Cu/p-Cu2O/rGO- Electrolyte Interface

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
S.P.A.U.K. Samarakoon ◽  
C.A.N. Fernando
Keyword(s):  
Diffuse Reflectance ◽  
Electrochemical Cell ◽  
Time Development ◽  
Charge Carriers ◽  
Electrochemical Cells ◽  
Current Action ◽  
Electrolyte Interface ◽  
Reduced Graphene ◽  
Efficient Charge ◽  
Photo Current

A considerable photo-current enhancement was found at the Cu/p-Cu2O/rGO-electrolyte interface in a photo-electrochemical cell with compared to that of Cu/p-Cu2O-electrolyte interface. The reason for the photo-current enhancement may be due to the efficient charge separation process provided at Cu/p-Cu2O/rGO-electrolyte interface. Here rGO (reduced graphene oxide) acts as an electron acceptor for the photo-generated charge carriers as it readily accept electrons from the conduction band of p-Cu2O. rGO was synthesized using electro-phoretic deposition (EPD) technique. Fabricated samples were characterized using diffuse reflectance spectra, photo-current action spectra and the time development of the photocurrent of photo-electrochemical cells.

High-rate and long-life of Li-ion batteries using reduced graphene oxide/Co3O4 as anode materials

RSC Advances ◽  
2016 ◽  
Vol 6 (29) ◽  
pp. 24320-24330 ◽  
Author(s):  
Junkai He ◽  
Ying Liu ◽  
Yongtao Meng ◽  
Xiangcheng Sun ◽  
Sourav Biswas ◽  
...  
Keyword(s):  
Anode Materials ◽  
High Capacity ◽  
High Rate ◽  
Microwave Method ◽  
Li Ion Batteries ◽  
Li Ion Battery ◽  
Reduced Graphene ◽  
One Step ◽  
Li Ion ◽  
Long Life

A new one-step microwave method was designed for synthesis of rGO/Co3O4, and the Li-ion battery showed high capacity and long life.

One-step hydrothermal treatment to fabricate Bi2WO6-reduced graphene oxide nanocomposites for enhanced visible light photoelectrochemical performance

2017 ◽  
Vol 5 (20) ◽  
pp. 3718-3727 ◽  
Author(s):  
Saibo Chen ◽  
Hao Nan ◽  
Xuan Zhang ◽  
Yuting Yan ◽  
Zhou Zhou ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Visible Light ◽  
Reduced Graphene Oxide ◽  
Hydrothermal Treatment ◽  
Solvothermal Method ◽  
Photoelectrochemical Performance ◽  
Reduced Graphene ◽  
One Step

Bi2WO6 functionalized reduced oxide nanocomposites were prepared by a one-step solvothermal method and their photoelectrochemical performance was greatly improved.

One-step electrodeposition of nickel cobalt sulfide nanosheets on Ni nanowire film for hybrid supercapacitor

2018 ◽  
Vol 259 ◽  
pp. 617-625 ◽  
Author(s):  
Shusheng Xu ◽  
Chen Su ◽  
Tao Wang ◽  
Yujie Ma ◽  
Jun Hu ◽  
...  
Keyword(s):  
Cobalt Sulfide ◽  
Hybrid Supercapacitor ◽  
Nickel Cobalt ◽  
One Step ◽  
Electrodeposition Of Nickel
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