ELECTROCHIMICA ACTA
·
2012
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IF 3.832
Pingfan Du,Lixin Song,Jie Xiong,Ni Li,Zhenqiang Xi,Longcheng Wang,Dalai Jin,Shaoyi Guo,Yongfeng Yuan
Novel TiO 2 /ZnO core–sheath nanofibers (NFs) film was fabricated through an extraordinary coaxial electrospinning technique . Dye-sensitized solar cells (DSSCs) were assembled using the TiO 2 /ZnO NFs film as photoanode . FESEM , TEM, FTIR , XRD , XPS and UV–vis were used to characterize the NFs electrode film. Photocurrent–voltage ( I – V ) characteristic, incident photo-to-current conversion efficiency (IPCE) spectrum, and electrochemical impedance spectroscopy (EIS) measurements were performed to evaluate the DSSCs performance. The results reveal that the DSSCs based on the TiO 2 /ZnO core–sheath NFs are superior to their bare TiO 2 NFs-based counterparts. Compared with the latter, the overall energy conversion efficiency was enhanced from 4.47 to 5.17%. And the possible mechanism for this enhancement was discussed.
研究领域:
材料科学
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纳米技术
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能源材料
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光电化学
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半导体薄膜
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
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2017
·
IF 2.572
Shu-Hui Xia,Shu-Hua Teng,Peng Wang
Polyvinyl alcohol/silica (PVA/SiO 2 ) hybrid fibers were prepared via a sol–gel combined electrospinning technique, and their potential application in bone tissue engineering was evaluated in terms of in vitro bioactivity. When the PVA concentration was 8%, the obtained PVA/SiO 2 hybrid fibers exhibited a uniform and continuous morphology, with an average fiber diameter of about 542.9 nm. The SiO 2 xerogel phase was uniformly distributed within the PVA matrix, and its actual content was very close to the theoretical value. After 3 days of immersion in simulated body fluid (SBF), the PVA/SiO 2 hybrid fibers displayed a vigorous precipitation of lamellar apatite crystals, reflecting their excellent in vitro bioactivity.
研究领域:
生物材料学
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组织工程
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纳米医学
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生物医学工程
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无机非金属材料
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再生医学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 34
·15881-15891
·
IF 6.97
Yong Xu,Jun Chen,Ze'en Xiao,Caixia Ou,Weixia Lv,Lihong Tao,Shengwen Zhong
A porous composite electrode composed of diatomite-mixed 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA) is prepared by electrostatic spinning technology. Compared with traditional coated electrodes without diatomite mixing, the obtained composite electrode materials have higher porosity, larger specific surface area and faster lithium ion transport channels, which makes them exhibit better electrochemical performance, such as smaller impedance, higher capacity, and better cycling stability and rate performance. The electrospun diatomite-mixed 1,4,5,8-NTCDA composite (ED-1,4,5,8-NTCDA) electrode shows an initial coulombic efficiency of 77.2%, which is much higher than that of the electrospun 1,4,5,8-NTCA (E-1,4,5,8-NTCDA) electrode without diatomite mixing (63.8%) and the coated 1,4,5,8-NTCA (C-1,4,5,8-NTCDA) electrode (48.3%). Moreover, the ED-1,4,5,8-NTCDA electrode displays an initial discharge capacity of 1106.5 mA h g−1, which is much higher than that of the E-1,4,5,8-NTCDA electrode (546.0 mA h g−1) and the C-1,4,5,8-NTCDA electrode (185.4 mA h g−1). After 200 cycles, the capacity of the ED-1,4,5,8-NTCDA electrode remains at 1008.5 mA h g−1 with a retention ratio of 91.2%, which is also much higher than that of 753.2 mA h g−1 for the E-1,4,5,8-NTCDA electrode and 288.1 mA h g−1 for the C-1,4,5,8-NTCDA electrode. Even at a higher current density of 1500 mA g−1, its capacity remains above 508.9 mA h g−1. The ED-1,4,5,8-NTCDA electrode presents superior performance, which opens up a promising new approach for further utilization of organic materials as electrode materials in rechargeable lithium-ion batteries.
研究领域:
材料科学
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电化学
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纳米科技
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能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Shiqi Sun,Yanjun Chen,Qiang Bai,Zhen Tian,Que Huang,Changcheng Liu,Shengnan He,Yaxiong Yang,Yanzhong Wang,Li Guo
Researchers are accustomed to utilizing traditional solid-state and sol–gel routes to synthesize Na 3 V 2 (PO 4 ) 3 (NVP). No regulation mechanism is proposed to illustrate the growth process of NVP in solvothermal environment. In current work, uniform spherical particles with positive charge are synthesized by molecular self-assembly of nanosphere micelles using structural guiding agent polyethylene glycol (PEG) and surfactant Cetyltrimethylammonium bromide (CTAB). Nanoflower-shaped NVP sample is successfully prepared in the 100 % methyl alcohol medium, derived from the plate V 2 O 5 (negative charge) combining with the nuclear nanospheres (positive charge) with the induction of electrostatic attraction. Based on the multi-dimensional tests and molecular dynamic calculation, the protective mechanism of polar solution for NVP system is proposed for the first time, that is, methanol solvent system can better protect the morphological features of NVP than water environment to maintain the original special nanoflower morphology. Due to the distinctive and stabilized nanoflower construction, the optimized NVP60 sample can provide more extra active sites for the efficient de-intercalation of Na + and possess a large contacting area with electrolyte, resulting in the facilitated kinetic characteristics and superior electrochemical performance. The optimized NVP60 cathode possesses superior sodium storage property in both half cell and full cell. This work proposes a synergetic strategy combining theory and experiment to design and synthesize the modified NVP-based cathode materials from the molecular bonding aspect, further promoting the development of high performance cathode for SIBs.
研究领域:
材料科学
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电化学
·
纳米材料
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能源存储
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无机化学
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计算材料学
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电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Nan Lu,Xi Zhang,Ruiqi Na,Wendi Ma,Chongyang Zhang,Yuchao Luo,Yongfeng Mu,Shuling Zhang,Guibin Wang
The synthesis of a nanocomposite gel polymer electrolytes (NGPEs) using Li + -functionalized SPEEK (SPEEK(Li)) nanofiber membrane as a matrix, cross-linked PVA as a gelled agent and LiClO 4 as an electrolytic salt for electric double layer capacitors (EDLCs) were reported in this work. Compared with conventional PVA based gel electrolyte, the “SO 3 − Li + ” functional groups and the pores structure of the SPEEK(Li) nanofiber membrane improves the ionic conductivity as well as mechanical stability , which made the prepared NGPEs exhibited a high ionic conductivity of 8.9 × 10 −3 S cm −1 at ambient temperature and a large voltage stability window range from 0 to 2.0 V. The fabricated symmetric EDLCs showed a specific capacitance of 146.96 F g −1 at a current density of 0.5 A g −1 , with a maximum energy density of 18.26 W h kg −1 . Meanwhile, the EDLCs showed outstanding cyclical stability of 98% specific capacitance retention after 3000 cycles GCD testing, all of these results indicated that the NGPEs should be appropriate to EDLCs and next-generation energy storage systems .
研究领域:
材料科学
·
电化学
·
能源存储
·
高分子化学
·
纳米技术
·
固体电解质
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）