排序方式: 共有71条查询结果,搜索用时 703 毫秒
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Yu Fu Yanyan Yang Dongxue Chu Zefeng Liu Lili Zhou Xiaoyang Yu Xiaoshu Qu 《Molecules (Basel, Switzerland)》2022,27(13)
Polyoxometalates (POMs) demonstrate potential for application in the development of integrated smart energy devices based on bifunctional electrochromic (EC) optical modulation and electrochemical energy storage. Herein, a nanocomposite thin film composed of a vanadium-substituted Dawson-type POM, i.e., K7[P2W17VO62]·18H2O, and TiO2 nanowires were constructed via the combination of hydrothermal and layer-by-layer self-assembly methods. Through scanning electron microscopy and energy-dispersive spectroscopy characterisations, it was found that the TiO2 nanowire substrate acts as a skeleton to adsorb POM nanoparticles, thereby avoiding the aggregation or stacking of POM particles. The unique three-dimensional core−shell structures of these nanocomposites with high specific surface areas increases the number of active sites during the reaction process and shortens the ion diffusion pathway, thereby improving the electrochemical activities and electrical conductivities. Compared with pure POM thin films, the composite films showed improved EC properties with a significant optical contrast (38.32% at 580 nm), a short response time (1.65 and 1.64 s for colouring and bleaching, respectively), an excellent colouration efficiency (116.5 cm2 C−1), and satisfactory energy-storage properties (volumetric capacitance = 297.1 F cm−3 at 0.2 mA cm−2). Finally, a solid-state electrochromic energy-storage (EES) device was fabricated using the composite film as the cathode. After charging, the constructed device was able to light up a single light-emitting diode for 20 s. These results highlight the promising features of POM-based EES devices and demonstrate their potential for use in a wide range of applications, such as smart windows, military camouflage, sensors, and intelligent systems. 相似文献
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Kurochkin N. S. Savinov S. A. Bi Dongxue Sychev V. V. Eliseev S. P. Gritsienko A. V. 《Journal of Russian Laser Research》2021,42(6):713-720
Journal of Russian Laser Research - The color centers in nanodiamonds are promising candidates for the fabrication of stable room-temperature sources of single photons. We investigate the... 相似文献
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Jixia Song Junhua Yuan Fei Li Dongxue Han Jiangfeng Song Li Niu 《Journal of Solid State Electrochemistry》2010,14(10):1915-1922
Oxygen electrochemical reduction on gold–polyaniline (Au–PANI) porous nanocomposite-modified glassy carbon electrode in basic
media was described. The as-prepared Au–PANI porous nanocomposite showed superior tunable activity for electrochemical reduction
of oxygen. The specific surface area of Au–PANI porous nanocomposites was evaluated to be about 11.3 m2 g−1 through a convenient voltammetric approach. Rotating ring-disk electrode experiments further demonstrated the number of electrons
exchanged in oxygen reduction increased from 2e to 4e with increasing the trigger potential from 300, to 500, 700 mV. The
tunable activity in electrochemical reduction of oxygen was achieved as a result of positive potential-induced formation and
reduction of Au surface oxide. However, the tunable oxygen reduction reaction is fit for applying potential in a linear positive-going
potential sweep. Irreversible ORR tunability was found after a more active surface formed at 700 mV. To optimize the applied
potential window on these Au-based porous materials has potential applications such as in electrochemical sensing, fuel cells,
or getting rid of the interference from the coexisted substances. 相似文献
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Huang K Zhang Y Long Y Yuan J Han D Wang Z Niu L Chen Z 《Chemistry (Weinheim an der Bergstrasse, Germany)》2006,12(20):5314-5319
One-dimensional gold/polyaniline (Au/PANI-CSA) coaxial nanocables with an average diameter of 50-60 nm and lengths of more than 1 mum were successfully synthesized by reacting aniline monomer with chlorauric acid (HAuCl(4)) through a self-assembly process in the presence of D-camphor-10-sulfonic acid (CSA), which acts as both a dopant and surfactant. It was found that the formation probability and the size of the Au/PANI-CSA nanocables depends on the molar ratio of aniline to HAuCl(4) and the concentration of CSA, respectively. A synergistic growth mechanism was proposed to interpret the formation of the Au/PANI-CSA nanocables. The directly measured conductivity of a single gold/polyaniline nanocable was found to be high (approximately 77.2 S cm(-1)). Hollow PANI-CSA nanotubes, with an average diameter of 50-60 nm, were also obtained successfully by dissolving the Au nanowire core of the Au/PANI-CSA nanocables. 相似文献
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The pyrrole-oligomer nanoparticles doped dodecylbenzenesulfonic acid (DBSA) have been fabricated in water-DBSA-isopropyl alcohol-isooctane reverse microemulsion, since DBSA could play the roles of both surfactant and dopant. We have found the optimum synthetic conditions by the analysis of factors affecting the yield and conductivity of oligopyrrole. The effect of solubility on the improved properties of DBSA-oligopyrrole in some organic solvents was studied employing UV-vis-NIR spectroscopy. This indicates that doping and pyrrole-oligomers may improve the poor processibility of PPy. Its environmentally stable properties were characterized by thermogravimetric and differential thermal analysis (TG-DTA). The maximum room temperature conductivity of products is 8.01 S/cm using the four-probe technique. The pyrrole-oligomers have been determined by the analysis of molecular weight measurement, and X-ray photoelectron spectroscopy (XPS) and elemental analysis were employed to investigate the formation of DBSA-oligopyrrole complexes. Correspondingly, the structural properties of DBSA-oligopyrrole were studied by infrared spectroscopy (IR), X-ray diffraction (XRD), transmission electron micrographs (TEM), and scanning electron microscopy (SEM). 相似文献
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