CELLULOSE
·
2017
·Vol. 24
·期 10
·4189-4203
·
IF 3.417
Zhang Xiuqiang,Zhang Jinlong,Dong Lili,Ren Suxia,Wu Qinglin,Lei Tingzhou
We report a series of thermoresponsive cellulose nanocrystals (CNCs) decorated with poly(poly(ethylene glycol) methylacrylate) copolymers (poly(PEGMA)- g -CNCs) synthesized by surface initiated-atom transfer radical polymerization (SI-ATRP). The chemical structures and surface morphologies were subsequently confirmed by FT-IR, XPS, and AFM measurements. With regard to thermally responsive behavior, poly(PEGMA)- g -CNCs show tunable lower critical solution temperature (LCST) values in the range of 34–66 °C by varying the feeding ratios of comonomers. The reversible morphological transformation from individual nano-rod structures to larger globule aggregates was further verified by AFM during the LCST transition. These functionalized CNCs have potential as smart film filters and biosensors.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 23
·12632-12642
·
IF 14.511
Liang Shu,Xin Zhang,Wei Li,Jing Gao,Hongliang Wang,Yu Huang,Yue-Yu-Shan Cheng,Qian Li,Lisha Liu,Jing-Feng Li
AgNbO3-based antiferroelectric films have attracted emerging attention in the field of dielectric energy storage and possess promising applications in photocatalysis and microwave devices. Unfortunately, it remains a challenge to fabricate pure-phase AgNbO3 films on Si substrates, precluding their further integration into electronic devices. Here, we, for the first time, report phase-pure AgNbO3 films on Pt/Ti/SiO2/Si substrates by a chemical solution deposition (CSD) method. A facile CSD route without using the hazardous pyridine additive is demonstrated to obtain a stable AgNbO3 precursor for spin-coating films. By comprehensively controlling the heat treatment conditions, secondary phases are eliminated in the deposited films. The phase transitions of the AgNbO3 films are also investigated, where intriguingly the room temperature phase is determined to be the antiferroelectric M2 phase, rather than the commonly reported M1 phase in bulk AgNbO3. Meanwhile, the relative dielectric permittivity surpasses 300 at room temperature and maintains at ∼400 with low dielectric loss (<0.05; measured at frequencies of 0.1–1 MHz) over a wide temperature range of 150–350 °C, within a 5% variation. This work provides an easy-to-implement process of AgNbO3 films which may attract scientific interests and potential applications.
研究领域:
材料科学
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电子工程
·
能源存储
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Yan Zhao,Luyi Yang,Yunxing Zuo,Zhibo Song,Fang Liu,Ke Li,Feng Pan
Employing conductive binders in silicon (Si) anode has been considered as a fundamental solution to the pulverization of Si particles. Therefore, it is still a great challenge to improve the charge transfer capability of the conductive binder. Herein, a copolymer (PFPQ-COONa) is synthesized, characterized, and electrochemically tested as conductive binder for Si anode. It is found that PFPQ-COONa exhibits not only excellent cycling stability, but also satisfactory rate performance with relatively high areal loading, which outperforms currently reported single-component conductive binders. The superior electrochemical performance can be attributed to the molecular-level contact between binder and Si particles and to the enhanced intrinsic conductivity of PFPQ-COONa at reductive potential. This method provides a fresh perspective to design and develop conductive binder for high-capacity battery anode.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
PubMed
高影响因子
Scientific Reports
·
2020
·Vol. 10
·期 1
·1-12
·
IF 3.998
Bo Caiying,Shi Zhongyu,Hu Lihong,Pan Zheng,Hu Yun,Yang Xiaohui,Jia Puyou,Ren Xiaoli,Zhang Meng,Zhou Yonghong
A novel eco-friendly halogen-free cardanol-based flame retardant with P, Si, and N on the chain backbone (PSNCFR) was synthesized and incorporated into phenolic foams (PFs). PSNCFR was comprehensively investigated via Fourier transform infrared spectroscopy and nuclear magnetic resonance. PSNCFR endowed PFs with flame retardancy, contributed to generating a composite char defense against flames, and efficiently prevented smoking from PFs. PSNCFR introduction improved the flexural strength of the PFs to approximately 155% of that of pristine PF. PSNCFR-modified PFs displayed a high limiting oxygen index value of 41.9%. The results of cone calorimeter show that the mean heat release rate, mean effective heat of combustion, and total heat release of the PSNCFR-modified PFs reduced by 26.92%, 35.71%, and 31.25%, respectively. In particular, the total smoke production of the PSNCFR-modified PFs decreased by 64.55%, indicating excellent smoke inhibition. As for the mechanism, the condensation and gas phases during pyrolysis were responsible for the synergistic flame retardancy in the modified PFs. The findings demonstrate that PSNCFR can be used in PF preparation to overcome their drawbacks of internal brittleness and flammability.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
IONICS
·
2019
·Vol. 26
·期 1
·1-11
·
IF 2.289
Xu Ruhui,Zhang Keyu,Wei Runhong,Yuan Meimei,Zhang Yenan,Liang Feng,Yao Yaochun
A facile, low cost, and low equipment-requirement preparation route of Si/C composite was developed. Naturally porous flour was carbonized through a conformal carbonization process and a further activation process in vacuum, obtaining flour-derived porous carbon (FPC) with ample pores. FPC was used to load nano-silicon through electrostatic adsorption method. Si-FPC was coated by sucrose-derived carbon (SC) shell by aqueous evaporation method to obtain Si-FPC-SC. Benefitting from FPC’s good dispersion for silicon, 40%-Si-FPC delivers a reversible capacity of 1562 mAh g −1 , equivalent to 83% of pure nano-silicon’s reversible capacity, an outstanding rate performance of 761 mAh g −1 at 1 A g −1 current density. The final 30%-Si-FPC-SC exhibits a reversible capacity of 937 mAh g −1 at 0.1 A g −1 , a cyclic retention of 82.3% after 100 cycles. Furthermore, the synthetic method of Si/C composites offers a universal idea for the research of high-capacity anode materials for lithium-ion batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2019
·Vol. 23
·期 11
·3145-3151
·
IF 2.531
Xu Xiaoyan,Cheng Jun,Li Yuanyuan,Nie Xiangkun,Dai Linna,Ci Lijie
As high energy density and enhanced safety are required for the lithium-ion battery development, all-solid-state battery has attracted significant attention. Herein, we report an all-solid-state full battery consisting of a Li 7 P 3 S 11 solid electrolyte coated silicon anode, Li 2 S/graphene composite cathode, and Li 7 P 3 S 11 solid-state electrolyte. With a high capacity for the silicon anode and Li 2 S cathode, this battery yields a high theoretical specific energy density up to 1495 Wh kg −1 , which is higher than that of lithium-ion batteries based on oxide cathodes. Moreover, Li 2 S cathode is used as lithium source instead of using metallic lithium, avoiding interface reaction between lithium metal anode and sulfide electrolyte Li 7 P 3 S 11 . This all-solid-state battery system we proposed could avoid the safety issues associated with the use of lithium metal and be a promising candidate for an enhanced energy density, which would promote their applications in the fields of electric vehicles and portable electronics.
研究领域:
材料科学
·
储能
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
OZONE-SCIENCE & ENGINEERING
·
2015
·
IF 0.953
Shengtao Jiang,Jianzhong Zhu,Ying Ding,Shuli Bai,Yujiang Guan,Qingmei Ye
This research measured the effectiveness of Si-FeOOH as a type of heterogeneous Fenton-like catalyst made from alkaline precipitation methods, in catalyzing the degradation of 2,4-dichlorophenol (2,4-DCP) wastewater. Factors including catalyst dosage, pH, and hydrogen peroxide dosage were investigated, showing: with an initial concentration of 2,4-dichlorophenol at 100 mg/L, a dosage of catalyst at 0.1 g/L, a dosage of H2O2 at 1.5 ml/L, pH at 5 and indoors temperature at 25 ± 1 °C, the degradation rate of 2,4-dichlorophenol, CODCr and TOC has reached 94.21%, 83.67%, and 76.11%, separately. Comparisons were made with FeOOH used as catalyst, showing that Fenton-like Si-FeOOH is a better catalyst than FeOOH.
研究领域:
环境科学
·
化学工程
·
水处理技术
·
高级氧化工艺
✓ 已验证
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 11
·2836
·
IF 3.623
Jin Shao,Yi Yang,Xiaoyan Zhang,Liming Shen,Ningzhong Bao
In this study, we have successfully prepared a free-standing Si/void/rGO yolk–shell structured electrode via the electrostatic self-assembly using protonated chitosan. When graphene oxide (GO) is dispersed in water, its carboxyl and hydroxyl groups on the surface are ionized, resulting in the high electronegativity of GO. Meanwhile, chitosan monomer contains -NH2and -OH groups, forming highly electropositive protonated chitosan in acidic medium. During the electrostatic interaction between GO and chitosan, which results in a rapid coagulation phenomenon, Si/SiO2nanoparticles dispersed in GO can be uniformly encapsulated between GO sheets. The free-standing Si/void/rGO film can be obtained by freeze-drying, high-pressure compression, thermal reduction and HF etching technology. Our investigation shows that after 200 charge/discharge cycles at the current density of 200 mA·g−1, the specific discharge capacity of the free-standing electrode remains at 1129.2 mAh·g−1. When the current density is increased to 4000 mA·g−1, the electrode still has a specific capacity of 469.2 mAh·g−1, showing good rate performance. This free-standing electrode with a yolk–shell structure shows potential applications in the field of flexible lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
柔性电子器件
✓ 已验证
DOI
高影响因子
Small
·
2022
·Vol. 19
·期 8
·2206071
·
IF 15.153
Fangqing Wang,Ying Li,Rui Zhang,Hui Liu,Yangyang Zhang,Xuerong Zheng,Jun Zhang,Cong Chen,Shijian Zheng,Huolin L. Xin
Atomically dispersed nitrogen-coordinated 3d transition-metal site on carbon support (M-NC) are promising alternatives to Pt group metal-based catalysts toward oxygen reduction reaction (ORR). However, despite the excellent activities of most of M-NC catalysts, such as Fe-NC, Co-NC et al., their durability is far from satisfactory due to Fenton reaction. Herein, this work reports a novel Si-doped Ni-NC catalyst (Ni-SiNC) that possesses high activity and excellent stability. X-ray absorption fine structure and aberration-corrected transmission electron microscopy uncover that the single-atom Ni site is coordinated with one Si atom and three N atoms, constructing Ni-Si 1 N 3 moiety. The Ni-SiNC catalyst exhibits a half-wave potential (E 1/2 ) of 0.866 V versus RHE, with a distinguished long-term durability in alkaline media of only 10 mV negative shift in E 1/2 after 35 000 cycles, which is also validated in Zn-air battery. Density functional theory calculations reveal that the Ni-Si 1 N 3 moiety facilitates ORR kinetics through optimizing the adsorption of intermediates.
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Xuli Ding,Yanjie Wang
Silicon is a promising anode material for the next-generation of high-specific-energy lithium-ion batteries (LIBs), but commercial silicon still has difficulty in gaining both high rate capability and long cycle life for practical application due to poor electrical conductivity and an unstable solid electrolyte interface. Here, a simple electrode with bilayer-graphene-coated Si nanoparticles embedded in a porous current collector is adopted and exceptional electrochemical performance is obtained in lithium-ions batteries. A possible mechanism is analyzed from the insight provided from the conductivity balance between electrons and ions. Used as binder-free and additive-free anodes, the Si composite displays good rate capacity (up to 50 A g −1 ) and cycling stability (3000 cycles with ∼89% capacity retention). Coupled with a possible physical insight, economical and feasible fabrication process, the electrode designs developed are likely to stimulate more opportunities for the next-generation high-specific-energy LIBs with enhanced power. It is further demonstrated that even in a full-cell electrochemical test, it is stable for 260 cycles and 87% capacity retention is achieved.
✓ 已验证
DOI
高影响因子
Applied Materials Today
·
2022
·
IF 8.663
Yaxiong Yang,Shugang Liu,Zhe Dong,Zhenguo Huang,Cheng Lu,Yongjun Wu,Mingxia Gao,Yongfeng Liu,Hongge Pan
Microsized silicon powders have great potential for high capacity anode materials in next-generation lithium ion batteries, because of the high gravimetric and volumetric energy densities, ease of mass production and low costs. However, large volume change and consequently rapid capacity fading upon lithiation and delithiation prevent its practical applications. Herein, we demonstrate an effective hierarchical conformal coating strategy for high-performance microsized Si anodes. The Si-based composites consist of an amorphous Li-Si-O inner coating layer and a graphene outer encapsulation layer, which are prepared by coupling reactive milling with electrostatic self-assembly. This unique hierarchical conformal coating structure not only strengthens the mechanical property (31.8 GPa for the elastic modulus) and promotes the ionic diffusion (2.03 × 10 −10 cm 2 s −1 ) of Si anode, but also effectively stabilizes the electrode/electrolyte interfaces and increases the electronic conductivity. As a result, a high reversible capacity (1450 mA⋅h g −1 at 0.1 A g −1 ), good cycling stability (97.7% of capacity retention from the 2nd to the 310th cycle at 0.5 A g −1 ), and high rate capability (703 mA⋅h g −1 at 5 A g −1 ) have been successfully achieved. These findings provide new insights into the improvement of electrochemical properties of microsized Si composite anodes for high-performance Li-ion batteries.
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Zhi Yang,Shufang Ma,Yu Shi,Xiaodong Hao,Lin Shang,Bin Han,Bocang Qiu,Bingshe Xu
Nanowires (NWs)-based heterojunction photodetectors (PDs) have been widely applied in the fields of remote sensing, night vision, environmental monitoring, and optical communications with high light absorption coefficient and photoelectric conversion efficiency. Here, S-GaAs NWs/Si heterojunction was developed to form a broadband self-powered PDs by growing GaAs NWs on Si substrate through the sulfur-catalyzed assisted chemical vapor deposition (CVD) technology. Compared with the pure GaAs NWs, the sulfur-assisted catalysts could not only inhibit Ostwald ripening of Au seeds to improve the crystalline quality of NWs but also form a thin Ga–S bond passivation layer to reduce surface defects and enhance the optoelectronic performance of the PDs. The fabricated GaAs NWs/Si heterojunction PDs exhibit excellent performances with the large responsivity of 10.3 mA W −1 and high detectivity of 9.59 × 10 12 cm Hz 1/2 W −1 . Additionally, the designed PDs have the broadband wavelength photoresponse from visible to near infrared and fast response speed (rise/fall time of 3.8/21.8 ms). Importantly, the develop strategy of hybrid heterojunction PDs can be extended to other semiconductor materials for facilitating the practical application of high-performance optoelectronic devices .
研究领域:
半导体材料
·
纳米电子学
·
光电子学
·
凝聚态物理
·
功能材料
·
器件物理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）