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Morphology and optical absorption of Bi_2Fe_4O_9 crystals via mineralizer-assisted hydrothermal synthesis

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Particuology 2013年第5期11卷 581-587页

作者： Yi Liu Ruzhong Zuo institute of Electro Ceramics & devices School of Materials Science and EngineeringHefei University of Technology

Submicron-sized Bi2Fe409 crystals were successfully synthesized via the hydrothermal method, while micron-sized Bi2Fe409 crystals with rod-like morphologies were obtained in the presence of the miner- alizer KN03. X-ray diffraction, scanning electron microscopy and transmission electron microscopy were employed to characterize the products. According to a series of time-dependent experiments, it was con- cluded that the likeliest formation mechanism for the microrods was the Ostwald ripening process. It was proposed that the blocking effect of NO3 contributed to the formation of the rod-like powders. Moreover, the optical absorption of the prepared Bi2Fe409 crystals was measured using an UV-vis spec- trophotometer, indicating that Bi2Fe409 powders can be used as effective photocatalysts under visible light.

关键词： Hydrothermal synthesisCrystal growthBi2Fe409 crystals

Preparation of spiro-type quaternary ammonium salt via economical and efficient synthetic route as electrolyte for electric double-layer capacitor

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Journal of Central South University 2015年第7期22卷 2435-2439页

作者：周宏明孙文佼李荐 School of materials science and Engineering Central South University Hunan Zhengyuan institute for Energy Storage materials and devices

A spiro-type quaternary ammonium salt, spiro-(1,1′)-bipyrrolidinium tetrafluoroborate(SBP-BF4) was successfully prepared by an economical and efficient three-step process comprising the cyclization reaction of 1,4-dibromobutane and pyrrolidine, and subsequent ion exchange pathway with KOH followed by neutralization reaction via HBF4 in the system of ethanol solution. 1H NMR, 13 C NMR, FI-IR and XPS analyses showed the structure of SBP-BF4. The as-obtained SBP-BF4 was dissolved in AN and used as the electrolyte for supercapacitor. Electrochemical measurements demonstrate that, compared with commercial electrolyte TEMA-BF4/AN, SBP-BF4/AN exhibits high ionic conductivity, lower resistance and improved cycling performance, which is due to its smaller ion size and stable symmetry structure.

关键词： spiro-type quaternary ammonium salt synthesis electrolyte electric double-layer capacitor

Effect of the stoichiometry on the electronic structure of the Ni(111)/α-Al_2O_3(0001) interface:a first-principles investigation

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Chinese Physics B 2008年第7期17卷 2655-2661页

作者：施思齐田中真悟香山正憲 Department of Physics Center for Optoelectronics Materials and DevicesZhejiang Sci-Tech UniversityXiasha College Park materials science Research Group Research Institute for Ubiquitous Energy DevicesNational Institute of Advanced Industrial Science and Technology

In this paper first-principles calculations of Ni（111）/α-Al2O3（0001） interfaces have been performed, and are compared with the preceding results of the Cu （111）/α-Al2O3（0001） interface [2004 Phil. Mag. Left. 84 425]. The AI- terminated and O-terminated interfaces have quite different adhesion mechanisms, which are similar to the Cu（111）/α Al2O3（0001） interface. For the O-terminated interface, the adhesion is caused by the strong O-2p/Ni-3d orbital hybridization and ionic interactions. On the other hand, the adhesion nature of the Al-terminated interface is the image-like electrostatic and Ni-Al hybridization interactions, the latter is substantial and cannot be neglected. Charge transfer occurs from Al2O3 to Ni, which is opposite to that in the O=terminated interface. The charge transfer direction for the Al-terminated and O-terminated Ni（111）/α-A1203（0001） interfaces is similar to that in the corresponding Cu（111）/α- Al2O3（0001） interface, but there exist the larger charge transfer quantity and consequent stronger adhesion nature, respectively.

关键词： metal/ceramic interface stoichiometry electronic structure first-principles calculations

Guest-assisted assembly strategy:boosting solvent-processed organic solar cells toward commercialization

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science China Chemistry 2022年第4期65卷 645-646页

作者： Yong Cao State Key Laboratory of Luminescent materials and devices Institute of Polymer Optoelectronic Materials and DevicesInstitute of Optoelectronic Materials and DevicesSouth China University of TechnologyGuangzhou 510640China

In recent years, due to the increasing demand for green energy, organic/polymer heterojunction solar cells have aroused great interest in the academic and industrial ***/polymer solar cells (OSCs) have a series of advantages over their counterparts. The morphology of the active layer and the energy band structure of the device can be adjusted easily by changing the molecular ***-area low-cost modules can be prepared by roll-to-roll solution printing at room temperature.

关键词： temperature structure polymer

Recent advances in solid-state LED phosphors with thermally stable luminescence

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Journal of Rare Earths 2019年第6期37卷 565-572页

作者： Jianwei Qiao Jing Zhao Quanlin Liu Zhiguo Xia School of materials science and Engineering University of Science and Technology Beijing State Key Laboratory of Luminescent materials and devices and institute of Optical Communication materials South China University of Technology

Phosphor-converted white light-emitting diode(LED) lighting has gained tremendous achievements since the invention of the InGaN blue LED by Nakamura et al., who won the Nobel Physics Prize in *** far, a significant challenge comes from the thermal quenching(TQ) behavior of the present LED phosphors during the high-power LED operation or the updated laser lighting. But systematic research or review on the luminescence quenching character and/or how to realize thermally stable luminescence are lacking. Since TQ is an inherent property of phosphors, it can be diminished by different *** review proceeds from the mechanism of TQ, summarizes previous researches on improving the thermal stability of LED phosphors and also discusses future research opportunities in this field. The developments of the phosphors with properties of high luminance and thermal stability, as well as the improved strategies involved,will benefit the basic researches and applications in high power lighting or high-luminance laser lighting.

关键词： White LEDs Phosphor Thermal quenching Rare earths

Control of slow light in a ring-out-ring structure

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Chinese Physics B 2011年第4期20卷 316-322页

作者：王楠掌蕴东袁萍 institute of Opto-electronics Harbin Institute of Technology Engineering Research Center of Optoelectronic materials & devices School of Materials Science and EngineeringDalian Jiaotong University

This paper proposes a ring-out-ring structure of coupled optical resonators to yield coupled-resonator-induced transparency （CRIT）. Considering the insertion loss of the coupler, it theoretically deduces the transmission and the effective phase shift. The influences of the insertion loss of the coupler on the transmittance, the effective phase shift, the group index and the CRIT linewidth are fully studied. We find that the increase in multiple m can effectively enhance the normal dispersion and the group index of the proposed structure. Moreover, the specific expression of the group index at resonance is theoretically deduced and discussed for the proposed structure with two rings. The result shows that the multiple m between the lengths of ring 1 and ring 2 can enhance the group index to m times that of the structure with two equal-sized rings at resonance. The control of slow light in the proposed structure is important for applications of highly sensitivity gyroscopes, optical delay lines and optical buffers, etc.

关键词： ring-out-ring structure dispersion group index slow light

Effect of Al_2O_3 addition on the non-isothermal crystallization kinetics and long-term stability of BCABS sealing glass for IT-SOFCs

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Journal of Advanced Ceramics 2018年第4期7卷 380-387页

作者： Zuzhi HUANG Linghong LUO Liangguang LIU Leying WANG Liang CHENG Xu XU Yefan WU Key Laboratory of Fuel Cell materials and devices Jingdezhen Ceramic Institute School of materials science and Engineering Jingdezhen Ceramic Institute

Owing to adjustable thermal expansion performance, BaO–CaO–Al_2O_3–B_2O_3–SiO_2(BCABS) glass has a promising commercialization prospect for intermediate temperature-solid oxide fuel cells(IT-SOFCs) sealing. Herein, Al_2O_3 with two different contents was added into the same glass formulation, referred to as A and B glass, respectively. In terms of the non-isothermal crystallization kinetic behavior, the effect of Al_2O_3 as the unique intermediate was innovatively studied on the long-term performance of BCABS sealing glass. After the heat treatment at 1023 K for 100 h, the change of the network structure and the expansion coefficient of the glass were characterized. The results showed that the addition of Al_2O_3 as a network forming body could enhance the structure of glass, and increase the activation energy for glass transition, which could effectively inhibit the crystallization ability of sealing glass. Therefore, the B glass with the higher Al_2O_3 content showed the better long-term sealing ability, which was greatly beneficial for IT-SOFCs sealing.

关键词： intermediate temperature-solid oxide fuel cell (IT-SOFC) BaO-CaO-Al2O3-B2O3-SiO2 (BCABS)sealing glass Al2O3 non-isothermal crystallization kinetics long-term stability

In situ construction of Cu(Ⅰ)-Cu(Ⅱ) pairs for efficient electrocatalytic nitrate reduction reaction to ammonia

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Journal of Energy Chemistry 2025年第01期 106-113页

作者： Muyun Zheng Yuchi Wan Leping Yang Shen Ao Wangyang Fu Zhengjun Zhang Zheng-Hong Huang Tao Ling Feiyu Kang Ruitao Lv State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University institute of New Energy materials and Engineering School of Materials Science and Engineering Fuzhou University Key Laboratory of Advanced materials (MOE) School of Materials Science and Engineering Tsinghua University Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education Tianjin Key Laboratory of Composite and Functional Materials School of Materials Science and Engineering Tianjin University

Electrocatalytic nitrate reduction reaction （NO3-RR） to ammonia under ambient conditions is expected to be a green process for ammonia synthesis and alleviate water pollution *** report a CuO nanoparticles incorporated on nitrogen-doped porous carbon （CuO@NC） catalyst for *** of Cu（Ⅱ） is reduced to Cu（Ⅰ） during the NO3-RR process to construct Cu（Ⅰ）-Cu（Ⅱ） pairs,confirmed by in situ X-ray photoelectron spectroscopy （XPS） and Raman *** functional theory （DFT） calculations indicated that the formation of Cu（Ⅰ） could provide a reaction path with smaller energy barrier for NO3-RR,while Cu（Ⅱ） effectively suppressed the competition of hydrogen evolution reaction （HER）.As a result,CuO@NC catalyst achieved a Faradaic efficiency of 84.2% at -0.49 V versus reversible hydrogen electrode （RHE）,and a NH3yield rate of 17.2 mg *** -0.79 V ***,higher than the HaberBosch process (<3.4 g h-1g-1cat.).This work may open a new avenue for effective NO3-RR by modulating oxidation states.

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Highly conductive and stable iodine doped argyrodite electrolyte for all-solid-state lithium batteries

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Journal of Energy Chemistry 2025年第01期 50-58页

作者： Gaozhan Liu Jing Zhang Jing Yang Jinghui Chen Xingyue Xiao Xiayin Yao Ningbo institute of materials Technology and Engineering Chinese Academy of Sciences Center of materials science and Optoelectronics Engineering University of Chinese Academy of Sciences

Lithium argyrodites with high ionic conductivity and low cost are considered as one of the most prospective solid electrolytes for all-solid-state lithium ***,the poor chemical stability and compatibility with lithium metal limit their ***,Li5.4PS4.4Cl1.4I0.2solid electrolyte with high ionic conductivity of 11.49 m S cm-1and improved chemical stability is synthesized by iodine *** ultra-thin Li5.4PS4.4Cl1.4I0.2membrane with thickness of 10μm can be obtained by wet coating process,exhibiting a high ionic conductivity of 2.09 mS cm-1and low areal resistance of 1.17Ω***,iodine doping could in-situ form LiI at the lithium/electrolyte interface and improve the critical current density of Li5.4PS4.4Cl1.6from 0.8 to 1.35 mA *** resultant LiCoO2/Li5.4PS4.4Cl1.4I0.2/Li battery shows excellent cycling stability at 1 C,with a reversible specific capacity of 110.1 mA h g-1and a retention of 80.5% after 1000 *** addition,the assembled LiCoO2/Li5.4PS4.4Cl1.4I0.2membrane/Li pouch cell delivers an initial discharge capacity of 110.4 mA h g-1and 80.5% capacity retention after 100 cycles.

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