Search UTSePress Research

Advanced Search

Browse

All of UTSePress Research

My Account

UTSePress Research Home
>
Browsing by Author

Browsing by Author "Ahn Hyojun"

Now showing items 1-20 of 20

Ab initio calculations on Li-ion migration in Li2FeSiO4 cathode material with a P21 symmetry structure

Su Dawei; Ahn Hyojun; Wang Guoxiu (American Institute of Physics, 2011)

We have systematically investigated the diffusion mechanism of Li ions in Li2FeSiO4 and its delithiated product LiFeSiO4 based on the P21 symmetry using the first principle method. Calculations on the energy barriers for ...
The addition of iron to Ni3S2 electrode for sodium secondary battery

Kim Jong-Seon; Cho Gyu-Bong; Kim Kiwon; Ahn Jou-Hyeon; Wang Guoxiu; Ahn Hyojun (Elsevier Inc, 2011)

In order to investigate the role of iron additive in the Ni3S2 electrode, the Ni3S2 electrode was prepared by addition of iron. The discharge properties of Na/Ni3S2 cells using 1 M NaCF3SO3 in tetra(ethylene glycol)dimethyl ...
Discharge Reaction Mechanism Of Room-Temperature Sodium-Sulfur Battery With Tetra Ethylene Glycol Dimethyl Ether Liquid Electrolyte

Ryu J; Kim Taebum; Kim Kiwon; Ahn Jou-Hyeon; Nam Taehyun; Wang Guoxiu; Ahn Hyojun (Elsevier Science Bv, 2011)

The first discharge curve of a sodium-sulfur cell using a tetra ethylene glycol dimethyl ether liquid electrolyte at room temperature shows two different regions: a sloping region and a plateau region of 1.66V. The first ...
The electrochemical properties of Li/TEGDME/MoS2 cells using multi-wall carbon nanotubes as a conducting agent

Kwon Jeong; Ahn Hyojun; Jeon Min; Kim Ki; Ahn In; Ahn Jou; Wang Guoxiu; Rye Ho (Springer, 2010)

We investigated the first charge-discharge behavior and cycling property of Li batteries using MoS2 electrodes with multi-wall carbon nanotubes (MWNT) as a conducting agent. The MoS2 electrode was prepared using MWNT as ...
Electrochemical properties of Na/Ni3S2 cells with liquid electrolytes using various sodium salts

Kim Jong-Seon; Lee Sang-Won; Liu Xiaojing; Cho Gyu-Bong; Kim Kiwon; Ahn In-Shup; Ahn Jou; Wang Guoxiu; Ahn Hyojun (Elsevier Inc, 2011)

For a Na/Ni3S2 cell operating at room temperature, three kinds of tetra (ethylene glycol) dimethyl ether (TEGDME) electrolytes, containing sodium trifluoromethane sulfonate (NaCF3SO3), sodium hexafluorophosphate (NaPF6), ...
Enhance electrochemical performance of lithium sulfur battery through a solution-based processing technique

Li Kefei; Wang Bei; Su Dawei; Park Jinsoo; Ahn Hyojun; Wang Guoxiu (Elsevier Ltd., 2012)

Sulfur/carbon nanocomposites have been successfully prepared by a solution-based processing technique using dimethyl sulfoxide as the solvent. The as-prepared nanocomposites were characterized by X-ray diffraction and field ...
First-principles study on the enhancement of lithium storage capacity in boron doped graphene

Wang Xianlong; Zeng Zhi; Ahn Hyojun; Wang Guoxiu (American Institute of Physics, 2009)

The adsorption of Li ions on boron doped graphene was investigated using a first-principles method. Our results show that, as boron doping turns graphene into an electron-deficient system, more Li ions can be captured ...
Graphene nanosheets as cathode catalysts for lithium-air batteries with an enhanced electrochemical performance

Sun Bing; Wang Bei; Su Dawei; Xiao Linda; Ahn Hyojun; Wang Guoxiu (Pergamon, 2012)

Graphene nanosheets have been investigated as cathode catalysts for lithium-air batteries with alkyl carbonate electrolyte. Field emission scanning electron microscopy, transmission electron microscope and Raman spectroscopy ...
Graphene-supported SnO2 nanoparticles prepared by a solvothermal approach

Wang Bei; Su Dawei; Park Jinsoo; Ahn Hyojun; Wang Guoxiu (Springer New York LLC, 2012)

SnO2 nanoparticles were dispersed on graphene nanosheets through a solvothermal approach using ethylene glycol as the solvent. The uniform distribution of SnO2 nanoparticles on graphene nanosheets has been confirmed by ...
Highly Ordered Mesoporous Cobalt Oxide Nanostructures: Synthesis, Characterisation, Magnetic Properties, And Applications For Electrochemical Energy Devices

Wang Gehong; Liu Hua-Kun; Horvat Josip; Wang Bing; Qiao Sz; Park J; Ahn Hyojun (Wiley-V C H Verlag Gmbh, 2010)

Highly ordered mesoporous Co3O4 nanostructures were prepared using KIT-6 and SBA-15 silica as hard templates. The structures were confirmed by small angle X-ray diffraction, high resolution transmission electron microscopy, ...
Highly Ordered Mesoporous Cobalt Oxide Nanostructures: Synthesis, Characterisation, Magnetic Properties, and Applications for Electrochemical Energy Devices

Wang Guoxiu; Liu Hua-Kun; Horvat Josip; Wang Bei; Qiao Sz; Park Jin; Ahn Hyojun (Wiley - VCH Verlag GmbH & Co. KGaA, 2010)

Highly ordered mesoporous Co3O4 nanostructures were prepared using KIT-6 and SBA-15 silica as hard templates. The structures were confirmed by small angle X-ray diffraction, high resolution transmission electron microscopy, ...
Highly ordered mesoporous NiO anode material for lithium ion batteries with an excellent electrochemical performance

Liu Hao; Wang Guoxiu; Liu Jian; Qiao Shizhang; Ahn Hyojun (Royal Society of Chemistry, 2011)

In this work, we have synthesized highly ordered mesoporous NiO materials by a nanocasting method using mesoporous silica KIT-6 as the hard templates. Mesoporous NiO particles were characterized by small angle X-ray ...
In situ synthesis of Co(3)O(4)/graphene nanocomposite material for lithium-ion batteries and supercapacitors with high capacity and supercapacitance

Wang Bei; Wang Ying; Park Jinsoo; Ahn Hyojun; Wang Guoxiu (Elsevier Science, 2011)

Abstract: Co(3)O(4)/graphene nanocomposite material was prepared by an in situ solution-based method under reflux conditions. In this reaction progress, Co(2+) salts were converted to Co(3)O(4) nanoparticles which were ...
LiNi0.4Co0.3Mn0.3O2 thin film electrode by aerosol deposition

Kim Icpyo; Nam Tae-Hyun; Kim Ki-Won; Ahn Jou-Hyeon; Park Dong-Soo; Ahn Cheolwoo; Chun Byong; Wang Guoxiu; Ahn Hyojun (Springer New York LLC, 2012)

LiNi0.4Co0.3Mn0.3O2 thin film electrodes are fabricated from LiNi0.4Co0.3Mn0.3O2 raw powder at room temperature without pretreatments using aerosol deposition that is much faster and easier than conventional methods such ...
Mesoporous LiFePO4/C Nanocomposite Cathode Materials for High Power Lithium Ion Batteries with Superior Performance

Wang Guoxiu; Liu Hao; Liu Jian; Qiao Shizhang; Lu Gaoqing; Munroe Paul; Ahn Hyojun (Wiley - V C H Verlag GmbH & Co. KGaA, 2010)

Abstract: Hexagonally ordered mesoporous LiFePO4/C nanocomposites can be synthesized with LiFePO4 nanoparticles embedded in an interconnected carbon framework. Mesoporous LiFePO4/C nanocomposites exhibit superior electrochemical ...
Microwave hydrothermal synthesis of high performance tin-graphene nanocomposites for lithium ion batteries

Chen Shuangqiang; Wang Yong; Ahn Hyojun; Wang Guoxiu (Elsevier Ltd., 2012)

Tin-graphene nanocomposites are prepared by a combination of microwave hydrothermal synthesis and a one-step hydrogen gas reduction. Altering the weight ratio between tin and graphene nanosheets has critical influences on ...
Mn3O4 Nanoparticles Embedded Into Graphene Nanosheets: Preparation, Characterization, And Electrochemical Properties For Supercapacitors

Wang Bing; Park J; Wang Changxin; Ahn Hyojun; Wang Gehong (Pergamon-Elsevier Science Ltd, 2010)

Mn3O4/graphene nanocomposites were synthesized by mixing graphene suspension in ethylene glycol with MnO2 organosol, followed by subsequent ultrasonication processing and heat treatment. The as-prepared product consists ...
MnO/C core-shell nanorods as high capacity anode materials for lithium-ion batteries

Sun Bing; Chen Zhixing; Kim Hyun; Ahn Hyojun; Wang Guoxiu (Elsevier Ltd., 2011)

MnO/C core-shell nanorods were synthesized by an in situ reduction method using MnO2 nanowires as precursor and block copolymer F127 as carbon source. Field emission scanning electron microscopy and transmission electron ...
Polyhedral magnetite nanocrystals with multiple facets: Facile synthesis, structural modelling, magnetic properties and application for high capacity lithium storage

Su Dawei; Josip Horvat; Paul Munroe; Ahn Hyojun; Ranjbartoreh Ali Rezah; Wang Guoxiu (Wiley - VCH Verlag GmbH & Co. KGaA, 2012)

Polyhedral magnetite nanocrystals with multiple facets were synthesised by a low temperature hydrothermal method. Atomistic simulation and calculations on surface attachment energy successfully predicted the polyhedral ...
Solvothermal synthesis of CoS2 graphene nanocomposite material for high-performance supercapacitors

Wang Bei; Park Jinsoo; Su Dawei; Wang Chengyin; Ahn Hyojun; Wang Guoxiu (Royal Society of Chemistry, 2012)

A CoS2-graphene nanocomposite was prepared by a facile solvothermal method. FESEM and TEM analyses have confirmed that CoS2 nanoparticles with sizes of 5-15 nm are densely anchored on graphene nanosheets. The as-prepared ...

Now showing items 1-20 of 20

Browsing by Author "Ahn Hyojun"

UTSePress Research/Manakin Repository

Search UTSePress Research

Browse

All of UTSePress Research

My Account

Browsing by Author "Ahn Hyojun"