Key Laboratory for Large format Battery Materials and Systems

Laboratory for, China

Key Laboratory for Large format Battery Materials and Systems

Laboratory for, China
SEARCH FILTERS
Time filter
Source Type

Huang H.,Key Laboratory for Large format Battery Materials and Systems | Zeng X.,Key Laboratory for Large format Battery Materials and Systems | Li W.,Key Laboratory for Large format Battery Materials and Systems | Wang H.,Huazhong University of Science and Technology | And 2 more authors.
Journal of Materials Chemistry A | Year: 2014

By using the in situ polymerization of aniline in an aqueous solution of sodium alginate, we prepared reinforced conducting hydrogels (PANI-SA) with good conductivity (∼10-3 S cm-1). SEM images indicated that the microstructure of PANI-SA hydrogels was a typical 3D nano-fiber network formed by the entanglement of the PANI and SA molecular chains, leading to a good compressive strength (∼41 kPa). Because the system does not contain any adhesives and conducting fillers, the PANI-SA conducting hydrogels with self-supported structures can be directly employed as electrode materials for supercapacitors. A study of cyclic voltammograms indicated that the currents of the cathodic peak significantly increased with an increase in the scan rate, indicating that the electrode materials possess good responsiveness. As a reference, traditional compressive tablet electrodes were also prepared by mixing the powder of PANI-SA xerogels, adhesive and conducting filler. The results of galvanostatic charge/discharge and impedance show that PANI-SA hydrogels possess longer discharge times, higher specific capacitance and lower electronic resistance in comparison with compressive tablet electrodes. After 1000 cycles of charge/discharge, there is almost no difference in the retained specific capacitance between PANI-SA hydrogels electrodes and compressive tablet electrodes. The easily fabricated PANI-SA conducting hydrogels show great potential as electrode materials for supercapacitors. This journal is © the Partner Organisations 2014.


Ni M.,Key Laboratory for Large Format Battery Materials and Systems | Peng H.,Chinese Academy of Sciences | Liao Y.,Key Laboratory for Large Format Battery Materials and Systems | Yang Z.,Huazhong University of Science and Technology | And 3 more authors.
Macromolecules | Year: 2015

We synthesize zinc sulfide (ZnS) nanoparticles with a diameter of ∼5 nm and formulate novel photopolymer/ZnS nanocomposites for holographic recording. By taking advantage of the photoinitibitor, composed of 3,3′-carbonylbis(7-diethylaminocoumarin) (KCD) and N-phenylglycine (NPG), with a capability of spatiotemporally tailoring the grating formation process, we successfully achieve high performance holographic photopolymer/ZnS nanocomposites with as high as 93.6% of diffraction efficiency (η), 26.6 × 10-3 of refractive index modulation (n1), 8.4 per 200 μm of dynamic range, and 9.8 cm/mJ of photosensitivity. In addition, for an aim of roughly describing the grating formation process, we establish a novel exponential correlation between the ZnS nanoparticles segregation degree (SD) and the ratio of photopolymerization gelation time (tgel) to holographic mixture viscosity (v). Finally, we reconstruct and display 3D images that are clearly identifiable to the naked eye through a master technique, opening a versatile class of potential applications in high capacity data storage, stereoadvertisements, and anticounterfeiting. © 2015 American Chemical Society.


Zeng X.,Key Laboratory for Large format Battery Materials and Systems | Sun Z.,Key Laboratory for Large format Battery Materials and Systems | Wang H.,Huazhong University of Science and Technology | Wang Q.,Huazhong University of Science and Technology | Yang Y.,Key Laboratory for Large format Battery Materials and Systems
Composites Science and Technology | Year: 2016

An inherent disadvantage of supramolecular gels is the lack of mechanical strength. In this work, we made an attempt to improve their mechanical strength through the adding hydrophobically modified halloysite nanotubes (HNTs) with in-situ formed Fe3O4 nanoparticles. Briefly, the magnetic supramolecular gel composites were prepared through adding 2 wt% benzyl sorbitol derivatives as the gelators into the solvents containing magnetic HNTs. It was found that the compressive strength of the reinforced supramolecular gel composites was remarkably increased from 19 kPa to 28 kPa by adding only 4 wt% of magnetic HNTs. The resultant magnetic supramolecular gel composites possess formability due to their sufficient mechanical strength and exhibit excellent properties for dye adsorption. Significantly, such magnetic supramolecular gel composites can be easily separated from the dye solutions by using an external magnet. © 2015 Elsevier Ltd.


Li W.,Key Laboratory for Large Format Battery Materials and Systems | Zeng X.,Key Laboratory for Large Format Battery Materials and Systems | Wang H.,Huazhong University of Science and Technology | Wang Q.,Huazhong University of Science and Technology | Yang Y.,Key Laboratory for Large Format Battery Materials and Systems
European Polymer Journal | Year: 2015

Due to the very poor mechanical strength of polyaniline-poly(styrene sulfonate) (PANI-PSS) conducting hydrogels, we explored the possibility to improve the strength of PANI-PSS hydrogels using supramolecular nanofibers formed by self-assembly of sorbitol derivatives (DBS). The compressive strength of these reinforced hydrogels was found to be 11 times higher than that of the unreinforced one. SEM studies indicated that the in-situ formed DBS nanofibers and PANI-PSS chains are entangled, leading to improvement of the hydrogel strength. The conductivity of reinforced hydrogels measured by impedance was found to be 10-4 S/cm, rather similar to that of the unreinforced hydrogels. In addition, the spectra of cyclic voltammetry for the reinforced and unreinforced hydrogels were almost the same. These results reveal that the presence of DBS nanofibers does not affect the electric properties of PANI-PSS hydrogels. As drug carriers with electric-driven release, the release rate of model drug Rhodamine B loaded within reinforced PANI-PSS hydrogels distinctly increased when an increase of voltage was applied. Furthermore, a pulse release could be realized when the voltage was alternatively applied. © 2015 Elsevier Ltd.All rights reserved..

Loading Key Laboratory for Large format Battery Materials and Systems collaborators
Loading Key Laboratory for Large format Battery Materials and Systems collaborators