CAS Ningbo Institute of Material Technology and Engineering

Ningbo, China

CAS Ningbo Institute of Material Technology and Engineering

Ningbo, China
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Lu W.,CAS Ningbo Institute of Material Technology and Engineering | Le X.,CAS Ningbo Institute of Material Technology and Engineering | Zhang J.,CAS Ningbo Institute of Material Technology and Engineering | Huang Y.,CAS Ningbo Institute of Material Technology and Engineering | Chen T.,CAS Ningbo Institute of Material Technology and Engineering
Chemical Society Reviews | Year: 2017

Supramolecular shape memory hydrogels (SSMHs) refer to shape memory polymers, in which temporary shapes are stabilized by reversible crosslinks such as supramolecular interactions and dynamic covalent bonds. Following a brief introduction of the conventional shape memory polymers (SMPs), this tutorial review is focused to summarize the recent advancement in various reversible crosslinks employed to construct SSMHs (supramolecular interactions and dynamic covalent bonds) and different shape memory behaviors (dual and triple shape memory effects). In addition, current challenges and future perspectives in this field are also discussed to suggest a new developing direction. © The Royal Society of Chemistry 2017.


Zhou X.,CAS Ningbo Institute of Material Technology and Engineering | Wang F.,Brookhaven National Laboratory | Zhu Y.,Brookhaven National Laboratory | Liu Z.,CAS Ningbo Institute of Material Technology and Engineering
Journal of Materials Chemistry | Year: 2011

Graphene-modified LiFePO4 composite has been developed as a Li-ion battery cathode material with excellent high-rate capability and cycling stability. The composite was prepared with LiFePO4 nanoparticles and graphene oxide nanosheets by spray-drying and annealing processes. The LiFePO4 primary nanoparticles embedded in micro-sized spherical secondary particles were wrapped homogeneously and loosely with a graphene 3D network. Such a special nanostructure facilitated electron migration throughout the secondary particles, while the presence of abundant voids between the LiFePO4 nanoparticles and graphene sheets was beneficial for Li + diffusion. The composite cathode material could deliver a capacity of 70 mAh g-1 at 60C discharge rate and showed a capacity decay rate of <15% when cycled under 10C charging and 20C discharging for 1000 times. © 2011 The Royal Society of Chemistry.


Wang Y.,CAS Ningbo Institute of Material Technology and Engineering | Wang Y.,University of Chinese Academy of Sciences | Liu Y.,CAS Ningbo Institute of Material Technology and Engineering | Chen S.,CAS Ningbo Institute of Material Technology and Engineering | And 2 more authors.
Chemistry of Materials | Year: 2013

Rational design and synthesis of polymeric semiconductors is critical to the development of polymer solar cells (PSCs). In this work, a new series of benzodithiophene-difuranylbenzooxadiazole-based donor-acceptor co-polymers-namely, PBDT-DFBO, PBDTT-DFBO, and PBDTF-DFBO, with various side groups-have been developed for bulk-heterojunction PSCs. These side-group substituents provide the opportunity to tailor the opto-electrical properties of the polymers. In addition, we show that the reduction of the bandgap of polymers and the enhancement of charge mobility in the devices can be accomplished concurrently by substituting the alkylthienyl side group with its furan counterpart. In the preliminary investigation, one could obtain PSCs with a power conversion efficiency (PCE) of 2.1% for PBDT-DFBO with an alkoxyl side chain, 2.2% for PBDTT-DFBO with an alkylthienyl side group, and 3.0% for PBDTF-DFBO with an alkylfuranyl side group. Further optimizing the performance of the devices was conducted via a simple solvent treatment. The PSCs based on PBDTF-DFBO:PC71BM could even achieve 7.0% PCE, which exhibited an enhancement of 130%. To the best of our knowledge, the value of 7.0% is the highest efficiency for furan-containing PSCs to date and is also comparable with the hitherto reported highest efficiency of the single junction PSCs. Through a combination of testing charge transport by the space-charge limited current (SCLC) model and examining the morphology by atomic force microscopy (AFM), we found that the effects of solvent treatment on the improved performance originate from higher and more balanced charge transport and the formation of fiberlike interpenetrating morphologies, which are beneficial to the increase of short-circuit current density (Jsc) and fill factor (FF). This work demonstrates a good example for tuning absorption range, energy level, charge transport, and photovoltaic properties of the polymers by side-chain engineering and the solvent treatment can offer a simple and effective method to improve the efficiency of PSCs. © 2013 American Chemical Society.


Liu Z.,CAS Ningbo Institute of Material Technology and Engineering | Zhou X.,CAS Ningbo Institute of Material Technology and Engineering | Qian Y.,Anhui University of Science and Technology
Advanced Materials | Year: 2010

Carbon nanomaterials have advanced rapidly over the last two decades and are among the most promising materials that have already changed and will keep on changing human life. Development of synthetic methodologies for these materials, therefore, has been one of the most important subjects of carbon nanoscience and nanotechnology, and forms the basis for investigating the physicochemical properties and applications of carbon nanomaterials. In this Research News article, several synthetic strategies, including solvothermal reduction, solvothermal pyrolysis, hydrothermal carbonization, and soft-chemical exfoliation are specifically discussed and highlighted, which have been developed for the synthesis of novel carbon nanomaterials over the last decade. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA,.


Zhou X.,CAS Ningbo Institute of Material Technology and Engineering | Liu Z.,CAS Ningbo Institute of Material Technology and Engineering
Chemical Communications | Year: 2010

High yield production of graphene oxide and graphene sheets with an ultralarge size (up to ∼200 μm) was realized using a modified solution-phase method. © 2010 The Royal Society of Chemistry.


Shen B.,CAS Ningbo Institute of Material Technology and Engineering | Lu D.,CAS Ningbo Institute of Material Technology and Engineering | Zhai W.,CAS Ningbo Institute of Material Technology and Engineering | Zheng W.,CAS Ningbo Institute of Material Technology and Engineering
Journal of Materials Chemistry C | Year: 2013

We firstly report a facile approach to produce few-layered graphene sheets by low-temperature (130 °C) exfoliation and reduction of graphite oxide under ambient atmosphere with the aid of HCl. The obtained graphene materials exhibited high BET specific surface area (∼500 m2 g-1) and excellent electrical conductivity (∼1200 S m-1). © 2013 The Royal Society of Chemistry.


Shen B.,CAS Ningbo Institute of Material Technology and Engineering | Zhai W.,CAS Ningbo Institute of Material Technology and Engineering | Zheng W.,CAS Ningbo Institute of Material Technology and Engineering
Advanced Functional Materials | Year: 2014

As the portable device hardware has been increasing at a noticeable rate, ultrathin thermal conducting materials (TCMs) with the combination of high thermal conductivity and excellent electromagnetic interface (EMI) shielding performance, which are used to efficiently dissipate heat and minimize EMI problems generated from electronic components (such as high speed processors), are urgently needed. In this work, graphene oxide (GO) films are fabricated by direct evaporation of GO suspension under mild heating, and ultrathin graphite-like graphene films are produced by graphitizing GO films. Further investigation demonstrates that the resulting graphene film with only ≈8.4 μm in thickness not only possesses excellent EMI shielding effectiveness of ≈20 dB and high in-plane thermal conductivity of ≈1100 W m-1 K-1, but also shows excellent mechanical flexibility and structure integrity during bending, indicating that the graphitization of GO film could be considered as a new alternative way to produce excellent TCMs with efficient EMI shielding. The graphitization of graphene oxide films can lead to the formation of graphite-like graphene films, which not only display a remarkable combination of excellent electromagnetic interface (EMI) shielding effectiveness and high in-plane thermal conductivity, but also show excellent mechanical flexibility, indicating a novel promising candidate for excellent thermal conducting materials with efficient EMI shielding. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Wang X.,CAS Ningbo Institute of Material Technology and Engineering | Zhou X.,CAS Ningbo Institute of Material Technology and Engineering | Yao K.,CAS Ningbo Institute of Material Technology and Engineering | Zhang J.,CAS Ningbo Institute of Material Technology and Engineering | Liu Z.,CAS Ningbo Institute of Material Technology and Engineering
Carbon | Year: 2011

A simple solution-based synthesis route, based on an oxidation-reduction reaction between graphene oxide and SnCl2•2H2O, has been developed to produce a SnO2/graphene composite. In the prepared composite, crystalline SnO2 nanoparticles with sizes of 3-5 nm uniformly clung to the graphene matrix. When used as an electrode material for lithium ion batteries, the composite presented excellent rate performance and high cyclic stability. The effect of SnO2/graphene ratio on electrochemical performance has been investigated. It was found that the optimum molar ratio of SnO2/graphene was about 3.2:1, corresponding to 2.4 wt.% of graphene. The composite could deliver a charge capacity of 840 mAh/g (with capacity retention of 86%) after 30 charge/discharge cycles at a current density of 67 mA/g, and it could retain a charge capacity of about 590 and 270 mAh/g after 50 cycles at the current density of 400 and 1000 mA/g, respectively. © 2010 Elsevier Ltd. All rights reserved.


Yang S.,CAS Ningbo Institute of Material Technology and Engineering | Zhou X.,CAS Ningbo Institute of Material Technology and Engineering | Zhang J.,CAS Ningbo Institute of Material Technology and Engineering | Liu Z.,CAS Ningbo Institute of Material Technology and Engineering
Journal of Materials Chemistry | Year: 2010

LiFePO4 (LFP) nanoparticles (∼50 nm in size), nanoplates (100 nm thick and 800 nm wide) and microplates (300 nm thick and 3 μm wide) have been selectively synthesized by a solvothermal method in a water-polyethylene glycol (PEG) binary solvent using H3PO 4, LiOH•H2O and FeSO4•7H2O as precursors. The morphology and size of the LFP particles were strongly dependent on synthetic parameters such as volume ratio of PEG to water, temperature, concentration, and feeding sequence. The carbon coated nanoparticles and nanoplates could deliver a discharge capacity of >155 mAh g-1 at 0.1C rate (i.e. 17 mA g-1 of current density); in comparison, the carbon coated microplates had a discharge capacity as low as 110 mAh g-1 at 0.1C rate. The Li-ion diffusion coefficients of the carbon coated nanoparticles, nanoplates, and microplates were calculated to be 6.4 × 10-9, 4.2 × 10-9, and 2.2 × 10-9 cm2 s-1, respectively. When the content of conductive Super P carbon (SP) was increased to 30 wt.%, the prepared electrodes could charge-discharge at a rate as high as 20C. Over 1000 cycles at 20C, the nanoparticle electrode could maintain 89% of its initial capacity (126 mAh g-1), the nanoplate electrode showed 79% capacity retention compared to an initial capacity (129 mAh g-1), and the microplate electrode retained 80% of its initial capacity (63.5 mAh g-1). © 2010 The Royal Society of Chemistry.


Wei H.,CAS Ningbo Institute of Material Technology and Engineering | Fang X.,CAS Ningbo Institute of Material Technology and Engineering
Polymer | Year: 2011

In the pursuit of the hydrolytically stable sulfonated polyimide (SPI) membranes with high proton conductivity for fuel cell applications, a series of novel SPI ionomers derived from benzophenone-4,4′-bis(4-thio-1,8- naphthalic anhydride) (BPBTNA) were conveniently synthesized. The accelerated water stability tests demonstrated that the resultant SPI membranes kept highly the original mechanical properties even after 24 h in water at 140 °C. The membranes exhibited a microphase-separated structure with high morphological stability, and well-collected hydrophilic domains that could work as proton transport channels. The proton conductivity of 1c with an IEC of 1.90 meq g -1 was higher than that of Nafion at 100% relative humidity (RH). © 2011 Elsevier Ltd. All rights reserved.

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