Small
·
2019
·Vol. 15
·期 12
·1805474
·
IF 10.856
Yi Jiang,Xingqiao Wu,Yucong Yan,Sai Luo,Xiao Li,Jingbo Huang,Hui Zhang,Deren Yang
Developing an efficient electrocatalyst for the hydrogen evolution reaction (HER) working in both acidic and alkaline solutions is highly desirable, but still remains challenging. Here, Pt x Ni ultrathin nanowires (NWs) with tunable compositions ( x = 1.42, 3.21, 5.67) are in situ grown on MXenes (Ti 3 C 2 nanosheets), serving as electrocatalysts toward HER. Such Pt x Ni@Ti 3 C 2 electrocatalysts exhibit excellent HER performance in both acidic and alkaline solutions, with the Pt 3.21 Ni@Ti 3 C 2 being the best one. Specifically, Pt 3.21 Ni@Ti 3 C 2 achieves record-breaking performance in terms of lowest overpotential (18.55 mV) and smallest Tafel slope (13.37 mV dec −1 ) for HER in acidic media to date. Theory calculations and X-ray photoelectron spectroscopy analyses demonstrate that the coupling of MXenes with the NWs not only approaches the Gibbs free energy for hydrogen adsorption close to zero through the electron transfer between them in acidic media, but also provides additional active sites for water dissociation in alkaline solution, both of them being beneficial to the HER performance.
研究领域:
材料科学
·
电化学
·
纳米催化
·
能源材料
·
物理化学
✓ 已验证
DOI
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
·
2019
·
IF 1.354
Mei Wang,Na Rao,Yuqing Liu,Jiale Li,Qunpeng Cheng,Jianfen Li
TETA or TETA-AEP mixtures were used as an activator to enhance CO2 capture in the MDEA solution. The effect of amount and type of activators, and the viscosity of absorbents on CO2 capture were discussed. The results showed that the positive effect of TETA-AEP mixtures on CO2 capture in the MDEA solution was greater than that of TETA. The optimal absorbent was No. V, whose CO2 absorption capacity/desorption efficiency was 3.08 times/1.18 times of No. І. The viscosity had a little influence on CO2 absorption and an obvious effect on CO2 desorption.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
THIN SOLID FILMS
·
2013
·
IF 1.604
Shufang Wang,Shanshan Chen,Guoying Yan,Fuqiang Liu,Shouyu Dai,Jianglong Wang,Wei Yu,Guangsheng Fu
c-axis oriented nanocrystalline Bi 2 Sr 2 Co 2 O y thin films with the average grain size of 25 nm have been achieved by chemical solution deposition combined with a rapid annealing process in oxygen. The resistivity and Seebeck coefficient of the nanostructured films are about 7.0 mΩ·cm and 171 μV/K at 873 K, resulting in a power factor 2–3 times larger than that of the best reported value in the coarse-grained Bi 2 Sr 2 Co 2 O y polycrystalline bulks. Since the thermal conductivity can be greatly reduced due to the increased phonon scattering at the grain boundaries of nanocrystalline films as well as at film surface and at film/substrate interface, great improvements in the ZT are expected in the nanocrystalline Bi 2 Sr 2 Co 2 O y thin films .
研究领域:
材料科学
·
凝聚态物理
·
无机非金属材料
·
能源材料
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2021
·
IF 3.423
Dan Liu,Sen Wen,Yuxiao Guo,Xingtian Yin,Wenxiu Que
Subject to the complexity and high cost of traditional semiconductor materials and manufacturing processes, the features of facile solution process with low cost have made the colloidal quantum dots (CQDs) more competitive, in which HgTe nanocrystals can be tuned as a potential in infrared region and achieve a great photoresponsivity. Herein, we reported the synthesis and characterization of HgTe CQDs materials by a facile solution process, and explored the relationship between the nanocrystal size and the reaction temperature and time, as well as the effect of the ligand exchange on the thickness of the HgTe CQDs film. The as-fabricated photoconductive device showed a high photoresponse even under a weak light, which provides a direction for the next-generation infrared photodetectors.
研究领域:
材料科学
·
纳米科技
·
光电子学
·
半导体物理
·
凝聚态物理
✓ 已验证
DOI
高影响因子
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2017
·Vol. 214
·期 11
·1700538
·
IF 1.775
Peihua Wangyang,Hui Sun,Xinghua Zhu,Dingyu Yang,Xiuying Gao,Wenyi Liu,Yan Chen,Haibo Tian,Sibo Huanglong
A promising photodetector based on CH 3 NH 3 PbI 3 single crystal under visible light and X-ray irradiation is reported. The CH 3 NH 3 PbI 3 crystal grown by inverse temperature crystallization acts as the absorber material directly converting visible light and the impinging X-ray photons to electron hole pairs, respectively. The underlying photoelectric response mechanism behind the observation under visible light and X-ray irradiation is carefully discussed. Remarkably, the perovskite detectors demonstrate a good air-exposure stability for more than 2 months with encapsulation. The results demonstrate that the CH 3 NH 3 PbI 3 single crystal has a great potential for application in the visible light and X-ray detection.
研究领域:
材料科学
·
凝聚态物理
·
核医学
·
生物医学工程
·
辐射检测
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半导体器件
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
·Vol. 42
·期 1
·1660-1665
·
IF 2.605
Yanxia Zheng,Gang Dong,Liyong He,Gang Wu,Huade Zheng,Chunlin Deng
Calcium phosphate layers, which are widely applied on the surface of biomaterials, are important for improving tissue regeneration performance. The composition of layers formed on the surface of biomaterials differs depending on the soaking fluid. Herein, revised simulated blood fluid and fast calcification solution were investigated as immersing solutions for the mineralization of hydroxyapatite ceramics. The morphology of the hydroxyapatite particles and precipitate formation on the hydroxyapatite ceramics surface were characterized by transmission electron microscopy . Furthermore, scanning electron microscopy was used to examine the morphology of the bioactive ceramics surface. The structure of the layers was determined by selected-area electron diffraction. The prepared hydroxyapatite powders were characterized by powder X-ray diffraction. The results showed that hydroxyapatite was preferentially formed on the hydroxyapatite ceramics surface in revised simulated blood fluid and octacalcium phosphate precipitated in fast calcification solution. Additionally, the content of HCO 3 - in the mineralization fluid strongly influenced the crystal phase composition and morphology of the calcium phosphate layers on the bio-ceramics materials studied herein.
研究领域:
生物材料学
·
组织工程
·
无机化学
·
生物医学工程
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牙科材料
·
骨再生
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·Vol. 43
·期 8
·6257-6262
·
IF 2.986
Zhongdong Zhao,Yihan Qi,Qiuying Chen,Xuerong Zheng,Qiuyan Hao,Wen Zhang,Jing Mao,Caichi Liu,Hui Liu
Compared with the expensive and complicated vacuum techniques, the solution-based process to deposit I-III-VI 2 chalcogenide thin films (I=Cu, III=In or Ga, VI=S or Se) has attracted great interests due to its lower cost, higher scalable production and better application in flexible substrate . Herein, a low-toxic and high-active mixture solvent comprised of 1, 2-ethanedithiol and 1,2-ethylenediamine is utilized to dissolve elemental Cu, In and S powders at 60 °C, forming the CuInS 2 (CIS) precursor solution . After spin coating and annealing in a both Ar gas and selenium atmosphere, a dense and large-grained chalcopyrite CuIn(S,Se) 2 (CISSe) thin films with a close-packed grain size of ~800 nm are prepared, eliminating a undesired fine fine-grained bottom layer. In addition, the selenization temperature of the CISSe thin films is also discussed, which influences the phase composition, crystallinity and morphology of CISSe thin films. Photovoltaic device of the CISSe-based thin films is fabricated, obtaining a power conversion efficiency of 6.2% with an active cell area of 0.5 cm 2 under AM 1.5 illumination.
研究领域:
材料科学
·
薄膜制备
·
光伏器件
·
无机功能材料
·
半导体材料
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 23
·12429-12437
·
IF 14.511
Shuang Li,Yunxiang Hou,Di Li,Bo Zou,Qingtang Zhang,Yang Cao,Guodong Tang
SnSe is considered one of the most intriguing new thermoelectric materials. Polycrystalline SnSe offers a wide range of thermoelectric applications due to its facile synthetic processing and machinability. Herein, we have achieved a high average ZT of 0.8 as well as a high peak ZT of 1.86 in solution-synthesized porous Zn and Ga codoped SnSe nanosheets, generating a maximum energy conversion efficiency of 13.3%. High-density micro/nanopores are induced in the SnSe matrix, which are more effective for scattering phonons and reducing the thermal conductivity. The high density of micro/nanopores, nanosheet structure and dislocations contribute to an ultralow lattice thermal conductivity (0.157 W m−1 K−1 at 873 K). Meanwhile, Ga incorporation can induce band convergence and create resonance levels, producing a large Seebeck coefficient. Ga and Zn codoping contributes to a sharp increase in carrier concentration and an obviously increased electrical conductivity. The enhanced Seebeck coefficient and increased carrier concentration help in achieving a significant enhancement of the power factor over a wide temperature range in the porous Zn and Ga codoped SnSe nanosheets. Consequently, high thermoelectric performance is realized over a wide temperature range via the decoupling of electron–phonon transport in SnSe. This work opens up a great opportunity for designing prospective materials for thermoelectric applications with the aid of the solution synthesis route.
研究领域:
材料科学
·
凝聚态物理
·
纳米科技
·
能源材料
·
半导体物理
·
热电转换
·
无机功能材料
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2016
·Vol. 24
·期 2
·863-870
·
IF 3.195
Chen Haizhen,Chen Jing,Teng Na,Na Haining,Zhu Jin
Residual ethanol was used as an activation agent to control the status of corn cellulose (CN cellulose) solution and thereby the morphology of CN cellulose fibers after electrospinning. A suitable amount of ethanol could combine with the CN cellulose chains to reduce their ionic absorbance, improving the migration ability of ions in the cellulose– N , N -dimethylacetamide (DMAc)/LiCl–ethanol system. As a result, the entanglement of the molecular chains of CN cellulose in solution was reduced. Excess ethanol reduced the migration ability of ions and enhanced the strong entanglement of CN cellulose in solution. By thus adjusting the status of the CN cellulose solution, the fiber morphology and diameter distribution after electrospinning could be controlled. Based on the experimental results, this approach represents an important and effective approach using ethanol as an activation and adjusting agent for CN cellulose to achieve formation of high-quality electrospun fibers.
研究领域:
高分子科学
·
材料科学
·
纤维工程
·
生物材料
·
纳米技术
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2017
·
IF 3.473
Yijun Zhang,Jiaqi Zhang,Junwen Zhang,Sai Lin,Yunyun Huang,Rongrong Yuan,Xiaojuan Liang,Weidong Xiang
A novel gold-carbon dots (GCDs) exhibiting relatively high luminescence have been successfully synthesized by a facile solution cast method. Intriguingly, colloidal Au nanoparticles (Au NPs) present an enhancement effect on the photoluminescence of CDs, which can be attributed to the metal enhanced fluorescence (MEF) included two cooperative mechanisms and near-field interactions. Significantly, the 1.5–3 fold enhancement was obtained in the vicinity of Au NPs. The formation mechanism and chemical structure of the as-prepared GCDs were verified by a series of characterization techniques, such as high-resolution transmission electron microscope (HRTEM), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). The GCDs with optimal fluorescence was acquired by varying volume ratio of colloidal Au NPs to CDs, rendering bright visible light under 460 nm excitation and high quantum yield (QY) of 39%. Given that, a simple spin coating technology was developed for fabricating GCDs film composed of GCDs solution and quartz glass. Subsequently, GCDs-based white light emitting diodes (white LED) was designed through integrating blue LED chips with the yellow light-emitting GCDs film. In addition, the GCDs film at appropriate thickness possesses excellent optical performances with the corresponding optimized color coordinate (CIE) of (0.33, 0.36), the color rendering index (CRI) of 78.2, correlated color temperature (CCT) of 5653 K, and the luminous efficiency (LE) approaching to 43.75 lm W −1 . These superior results demonstrate that GCDs constitute a versatile and effective route for achieving high-performance white LED.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
发光材料
·
半导体器件
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2016
·
IF 2.265
Yimin Wu,Ilia Korolkov,Xvsheng Qiao,Xianghua Zhang,Jun Wan,Xianping Fan
A rapid injection approach is used to synthesize the copper selenide nanoparticles and two-dimensional single crystal nanoplates . This technique excludes the use of toxic or expensive materials, increasing the availability of two-dimensional binary chalcogenide semiconductors. The structure of the nanocrystals has been studied and the possible formation mechanism of the nanoplates has been proposed. The optical absorption showed that the nanoplates demonstrated wide and tuneable absorption band in the visible and near infrared region . These nanoplates could be interesting for converting solar energy and for nanophotonic devices operating in the near infrared .
研究领域:
材料科学
·
纳米科技
·
半导体材料
·
光电子学
·
能源材料
✓ 已验证
DOI
高影响因子
Advanced Intelligent Systems
·
2019
·Vol. 1
·期 3
·1900022
·
IF 0
Yang Feng,Xu Gao,Ya-Nan Zhong,Jia-Ling Wu,Jian-Long Xu,Sui-Dong Wang
Emerging organic synaptic devices are promising in exploring soft and biocompatible neuromorphic computing systems. By means of a simple and low-cost solution process, the polymer thin-film memristors are designed and characterized. The polymer memristors have a bilayer structure composed of an ion-rich semiconducting layer and an ion-collecting conducting layer, where the ion redistribution depending on device operation history has an impact on carrier concentration and results in the memristive characteristics. A visible electrochromic feature is observed during the electrical measurements, supporting the proposed Li + ion drift/diffusion mechanism. The polymer memristors show the continuous and reversible conductivity tuning with a temporary memory effect, which enables the successful emulation of the frequency-dependent synaptic plasticity. The polymer thin-film memristors may offer a strategy for developing building blocks of organic neuromorphic circuits.
研究领域:
生物电子学
·
神经形态工程
·
有机电子学
·
分子器件
·
生物医学工程
✓ 已验证
DOI
危险品化学品经营许可证（带存储）