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Facile construction of novel CoMoO4 microplates@CoMoO4 microprisms structures for well-stable supercapacitors

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Progress in Natural Science:Materials International 2016年第3期26卷 243-252页

作者： Xuewen Geng Yuanfei ai Guozhen shen State Key Laboratory of Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences

A simple and controllable strategy has been developed to fabricate CoMoO4microplates/CoMoO4microprisms（CMCMs） structures on Ni foam via a facile, cost-effective, two-step hydrothermal route. The as-grown 3D architecture exhibited excellent areal capacitance of 4.33 F cm-2at a galvanostatic chargedischarge current density of 50 mA cm-2(6 Ag-1) and outstanding cycle performance with only 2.8%degradation over 6500 cycles in the 3 M KOH solution. The asymmetric all-solid-state supercapacitors based on activated carbon（AC） and CMCMs exhibited much better electrochemical performance than the symmetric counterpart, showing an areal capacitance of 95.22 mF cm-2at the current density of 12 m A cm-2and excellent cycling stability with 92.27% of the initial capacitance after 5000 cycles. These results may provide useful guidelines for materials selection and configuration designs for the novel energy storage devices based on Co Mo O4 components and substrates.

关键词： Supercapacitors Microplates Microprisms Molybdates

Transition metal-nitrogen-carbon nanostructured catalysts for the oxygen reduction reaction： From mechanistic insights to structural optimization

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Nano Research 2017年第5期10卷 1449-1470页

作者： Mengxia shen Changting Wei Kelong ai Lehui Lu State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China University of Chinese Academy of Sciences Beijing 100039 China

Accelerating the rate-limiting oxygen reduction reaction （ORR） at the cathode remains the foremost issue for the commercialization of fuel cells. Transition metal-nitrogen-carbon （M-N/C, M = Fe, Co, etc.） nanostructures are the most promising class of non-precious metal catalysts （NPMCs） with satisfactory activities and stabilities in practical fuel cell applications. However, the long-debated nature of the active sites and the elusive structure-performance correlation impede further developments of M-N/C materials. In this review, we present recent endeavors to elucidate the actual structures of active sites by adopting a variety of physicochemical techniques that may provide a profound mechanistic understanding of M-N/C catalysts. Then, we focus on the spectacular progress in structural optimization strategies for M-N/C materials with tailored precursor architectures and modified synthetic routes for controlling the structural uniformity and maximizing the number of active sites in catalytic materials. The recognition of the right active centers and site-specific engineering of the nanostructures provides future directions for designing advantageous M-N/C catalysts.

关键词： oxygen reduction reaction,catalyst,metal-nitrogen-carbon(M-N/C M = Fe Co etc.),fuel cell

Crust and upper mantle structure beneath Bohai Sea inferred from receiver function study

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Earthquake Science 2011年第1期24卷 35-43页

作者： Yinshuang ai Zhongyin shen Key Laboratory of the Earth's Deep Interior Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China

We analyzed teleseismic waveforms recorded by 36 stations near Bohai Sea region and obtained 2 248 high quality receiver *** crustal thickness (H) and average crustal vP/vS ratio (κ) as well as the Poisson's ratios beneath 34 stations were estimated using the H-κ stacking *** results indicate that crustal thicknesses near the Liaoning province range from 30.0 to 35.5 km,and the corresponding vP/vS ratios vary from 1.72 to 1.89 which corresponds to Poisson's ratio with a range from 0.243 to *** also apply a common conversion point (CCP) stacking method of receiver function (RF) to image the upper mantle discontinuity structure beneath Bohai Sea *** the 410-km and the 660-km discontinuities (hereafter called the 410 and the 660) show clearly in the study *** transition zone (TZ) thickness shows a different picture from the west to the east of the study region,which is a little bit thicker than that of the global average in the west of longitude 122°E,however,thinner in the east of longitude 122°*** suggested that the dehydration of sinking slab into the lower mantle or a small-scale mantle plume from the lower mantle generated hot upwelling beneath this region.

关键词： receiver function crustal thickness upper mantle discontinuity

Land-surface temperature retrieval at high spatial and temporal resolutions based on multi-sensor fusion

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International Journal of Digital Earth 2013年第S01期6卷 113-133页

作者： Penghai Wu Huanfeng shen Tinghua ai Yaolin Liu School of Resource and Environmental Science Wuhan UniversityWuhanChina

Land-surface temperature(LST)is of great significance for the estimation of radiation and energy budgets associated with land-surface ***,the available satellite LST products have either low spatial resolution or low temporal resolution,which constrains their potential *** paper proposes a spatiotemporal fusion method for retrieving LST at high spatial and temporal *** important characteristic of the proposed method is the consideration of the sensor observation differences between different land-cover *** other main contribution is that the spatial correlations between different pixels are effectively considered by the use of a variation-based *** method was tested and assessed quantitatively using the different sensors of Landsat TM/ETM,moderate resolution imaging spectroradiometer and the geostationary operational environmental satellite *** validation results indicate that the proposed multisensor fusion method is accurate to about 2.5 K.

关键词： land-surface temperature image fusion remote sensing resolution

Robust video denoising with sparse and dense noise modelings

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Science China(Information Sciences) 2018年第1期61卷 270-272页

作者： Guiping shen Zhi HAN Xi'ai CHEN Yandong TANG State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of Sciences University of Chinese Academy of Sciences

Videos can be contaminated by noise even when captured by high-quality *** video data has both spatial and temporal redundancies,low rank factorization has been ***,most denoising methods relied on a single statistical distribution to model noise,such as Gaussian distribution[1,2].Ji et al.[3]proposed a low rank matrix completion(LRMC)relying on

关键词： Robust video denoising with sparse and dense noise modelings Figure

Promoted Li+ conduction in PEO-based all-solid-state electrolyte by hydroxyl-modified glass fiber fillers

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Rare Metals 2023年第3期42卷 875-884页

作者： Xin Wang Xiu shen Peng Zhang ai-Jun Zhou Jin-Bao Zhao Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313001China State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Centre of Chemistry for Energy MaterialsState-Province Joint Engineering Laboratory of Power Source Technology for New Energy VehicleEngineering Research Center of Electrochemical TechnologyMinistry of EducationCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China College of Energy and School of Energy Research Xiamen UniversityXiamen 361102China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China

In the polyoxyethylene(PEO)-based solid-state electrolytes,the low ionic conductivity of lithium ions limits its application in solid-state lithium batteries,so optimizing the conduction path of lithium ions is beneficial to improve the ionic *** this work,we report the use of hydrothermal carbon nano-sphere(HCS)modified glass fibers(GF)as a functional filler(GF@HCS)to improve the ionic conductivity of PEO composite solidstate *** oxygen atoms in the hydroxyl groups on the surface of HCS can be complexed with Li ions as its transport sites,which means that it can promote the longdistance transport of Li ions along the glass fiber *** addition of 2 wt%GF@HCS fillers,the degree of crystallinity of PEO composite solid-state electrolyte is the smallest,and the ionic conductivity is significantly increased from 8.9×10^(-5) to 4.4×10^(-4) S·cm^(-1) at 60℃.Moreover,the PEO composite solid-state electrolyte exhibits better lithium-metal interface stability in symmetric lithium batteries and superior rate performance in LiFePO4 solid-state batteries.

关键词： Filler modification Hydrothermal carbon spheres Transport channel Polyoxyethylene(PEO)composite electrolyte All-solid-state battery

Growth behavior of polycrystalline silicon thin films deposited by RTCVD on quartz substrates

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Chinese Science Bulletin 2010年第19期55卷 2057-2062页

作者： ai Bin LIU Chao LIANG XueQin shen Hui Institute for Solar Energy Systems State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen University Guangzhou 510006 China

Polycrystalline silicon(poly-Si) thin films were prepared on quartz substrates by rapid thermal chemical vapor deposition(RTCVD) system,and their structures were studied by XRD,SEM and TEM,*** spectra exhibit a single strong(220) diffraction peak,which indicates that the poly-Si films are preferentially ***-view SEM images show that the surface of the poly-Si films is composed of large numbers of polygonal pyramid grains with different sizes,and cross-section SEM images further indicate that they are columnar grains with growth direction perpendicular to substrate *** observation results demonstrate that there are a lot of twin crystals including one-order,two-order and high-order(≥3) twin crystals in the poly-Si *** above experimental results can not be elucidated by the conventional opinion on growth behavior of poly-Si films prepared by atmosphere pressure chemical vapor deposition(APCVD),but can be explained by the Ino's multiply twinned particles(MTPs) model found in the face centered cubic metal *** to the above experimental results and Ino's model,we tend to think that nucleation and grain growth of poly-Si films deposited by RTCVD on quartz substrates are based on the formation of MTPs,and then these MTPs form the continuous films in an island growth mode.

关键词：快速热化学气相沉积多晶硅薄膜 RTCVD 石英衬底生长方向行为 X射线衍射谱扫描电镜照片

A progressive method for the collapse of river representation considering geographical characteristics

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International Journal of Digital Earth 2020年第12期13卷 1366-1390页

作者： Yilang shen Tinghua ai Jingzhong Li Lina Huang Wende Li School of Resource and Environmental Sciences Wuhan UniversityWuhanPeople’s Republic of China

During map generalization,the collapse of geometry,which is also called geometric dimension reduction,is a basic generalization *** the map scale decreases,rivers with long,shallow polygonal shapes,usually require their dual-line representation to be collapsed to a single *** study presents a new algorithm called superpixel river collapse(SURC)to convert dual-line rivers to single-line rivers based on raster *** this method,dual-line rivers are first segmented at different levels of detail using a superpixel method called simple linear iterative ***,by connecting the edge midpoints and centre of mass of each superpixel,single-line rivers are preliminarily generated from dual-line ***,an interpolation algorithm called polynomial approximation with an exponential kernel is applied to maintain the uniform distribution of the feature points of single-line rivers at different levels of detail(LOD).The presented method can progressively collapse the river during scale transformation to support the LOD representation in a highly sensitive *** results show that compared with three typical thinning algorithms,the SURC method can generate smooth single-line rivers from dual-line rivers considering different river widths while effectively avoiding burrs and fractured intersections.

关键词： Collapse dual-line rivers skeleton line map generalization

Granule Size Distribution and Porosity of Granule Packing

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Journal of Iron and Steel Research International 2008年第5期15卷 1-5页

作者： Dai Shu-hua shen Feng-man YU ai-bing School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China School of Raw Material Science and Engineering University of New Southern Wales Sydney NSW2052 Australia

The granule size distribution and the porosity of the granule packing process were researched. For realizing the optimizing control of the whole sintering production process, researchers must know the factors influencing the granule size distribution and the porosity. Therefore, tests were carried out in the laboratory with regard to the influences of the size and size distribution of raw materials and the total moisture content on the size and size distribution of granule. Moreover, tests for finding out the influences of the moisture content and the granule volume fraction on the porosity were also carried out. The results show that （1） the raw material has little influence on granulation when its size is in the range of 0. 51 mm to 1.0 mm; （2） the influence of the material size on granule size plays a dominant role, and in contrast, the moisture content creates a minor effect on granule size; （3） in binary packing system, with the increase in the constituent volume fraction, the porosity initially increases and then decreases, and there is a minimum value on the porosity curve of the binary mixture system; （4） the minimum value of the porosity in binary packing system occurs at different locations for different moisture contents, and this value shifts from right to left on the porosity curve with increasing the moisture content; （5） the addition of small granules to the same size component cannot create a significant influence on the porosity, whereas the addition of large granules to the same system can greatly change the porosity.

关键词： granule raw material size distribution granulation granule packing porosity