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| 1 | Structure characterization of BiFeO3-SrBi2Nb2O9 ceramics by mechanical activation 显示文摘 | GU Haoshuang ZHANG Tianjin CAO Wanqiang | 2003 | Mater Sci Eng2003，，： | 1 |
| 2 | Carrier Transport Across Grain Boundaries in Polycrystalline Silicon Thin Film Transistors显示文摘We established a model for investigating polycrystalline silicon(poly-Si) thin film transistors(TFTs).The effect of grain boundaries(GBs) on the transfer characteristics of TFT was analyzed by considering the number and the width of grain boundaries in the channel region,and the dominant transport mechanism of carrier across grain boundaries was subsequently determined.It is shown that the thermionic emission(TE) is dominant in the subthreshold operating region of TFT regardless of the number and the width of grain boundary.To a poly-Si TFT model with a 1 nm-width grain boundary,in the linear region,thermionic emission is similar to that of tunneling(TU),however,with increasing grain boundary width and number,tunneling becomes dominant. | 陈勇 ZHANG Shuang 李璋 HUANG Hanhua WANG Wenfeng ZHOU Chao CAO Wanqiang 周郁明 | 2016 | Journal of Wuhan University of Technology(Materials Science)2016，31，1： | 1 |
| 3 | Designing a photo-assisted Co-C_(3)N_(4) cathode for high performance Li-O_(2) batteries显示文摘Li-O_(2) batteries with extremely high specific energy density have been regarded as a kind of promising successor to current Li-ion batteries.However,the high charge overpotential for the decomposition of Li_(2)O_(2) discharge product reduces the energy efficiency and triggers a series of side reactions that cause the Li-O_(2) batteries to have a limited lifetime.Herein,Co-doped C_(3)N_(4)(Co-C_(3)N_(4))photocatalysts were designed by an in situ thermal evaporation method to take advantage of the photo-assisted charging technology to conquer the shortcomings of Li-O_(2) batteries encountered in the charge process.Different from the commonly used photocatalysts,the Co-C_(3)N_(4) photocatalysts perform well no matter with and without illumination,owing to the Co doping induced conductivity and electrocatalytic ability enhancement.This makes the Co-C_(3)N_(4) reduce the charge and discharge overpotentials and improve the cycling performance of Li-O_(2) batteries(from 20 to 106 cycles)without illumination.While introducing illumination,the performance can be further improved:Charge voltage reduces to 3.3 V,and the energy efficiency increases to 84.84%,indicating that the Co-C_(3)N_(4) could behave as a suitable photocathode for Li-O_(2) batteries.Besides,the low charge voltage and the continuous illumination together weaken the corrosion of the Li anode,making the long-term high-efficiency operation of Li-O_(2) batteries no longer just extravagant hope. | Renfei Cao Yangfeng Cui Gang Huang Wanqiang Liu Jianwei Liu Xinbo Zhang | 2023 | Nano Research2023，16，6： | 0 |
| 4 | Gel electrolyte via in situ polymerization to promote durable lithium-air batteries显示文摘Aprotic lithium-air batteries(LABs)have been known as the holy grail of energy storage systems due to their extremely high energy density.However,their real-world application is still hindered by the great challenges from the Li anode side,like dendrite growth and corrosion reactions,thus a pure oxygen atmosphere is usually adopted to prolong the lifetime of LABs,which is a major obstacle to fully liberate the energy density advantages of LABs.Here,a gel polymer electrolyte has been designed through in-situ polymerization of 1,3-dioxolane(DOL)by utilizing the unique semi-open nature of LABs to protect the Li anode to conquer its shortcomings,enabling the high-performance running of LABs in the ambient air.Unlike common liquid electrolytes,the in-situ formed gel polymer electrolyte could facilitate constructing a gradient SEl film with the gradual decrease of organic components from top to bottom,preventing the Li anode from dendrite growth and air-induced corrosion reactions and thus realizing durable Li repeated plating/stripping(2000h).Benefiting from the anode protection effects of the gradient SEI film,the LABs display a long lifetime of 17o cycles,paving an avenue for practical,long-term,and high-efficiency operation of LABs. | Renfei Cao Kai Chen Yangfeng Cui Jianwei Liu Wanqiang Liu Gang Huang Xinbo Zhang | 2023 | Chinese Chemical Letters2023，34，12： | 0 |
| 5 | Piezoelectric and ferroelectric properties of Na_(0.5)Bi_(4.5)Ti_(4)O_(15)-BaTiO_(3) composite ceramics with Mg doping显示文摘As one of the representatives of lead-free NBT ceramics,Na_(0.5)Bi_(4.5)Ti_(4)O_(15) has still attracted much attention due to its excellent dielectric properties and has become the focus of research.However,its piezoelectric properties are far from satisfactory.In order to improve the piezoelectric properties of Na_(0.5)Bi_(4.5)Ti_(4)O_(15),Na_(0.5)Bi_(4.5)Ti_(4-x)Mg_(x)O_(y)–BaTiO_(3)(NBTM–BT)composite ceramics were synthesized by a conventional mixed oxide route and sintered at 1040℃ through two-step method.We optimized the electrical properties of NBTM–BT by changing the stoichiometric ratio of Mg content and studied its microscopic mechanism.The piezoelectric coefficient(d33)is stable at about 20 pC/N.Moreover,the maximum remanent polarization(2Pr)of the ceramic is 3.08C/cm^(2) with the coercive field of 18.01 kV/cm.The dielectric constant and dielectric loss for Na_(0.5)Bi_(4.5)Ti_(3.96)Mg_(0.04)–BT composite ceramic were found to be 486 and 0.17 at 10 kHz,respectively.The characteristic peaks of BT and Na_(0.5)Bi_(4.5)Ti_(4)O_(15) can be observed clearly from the X-ray diffraction analysis.SEM analysis showed that all samples were well crystallized.Consequently,the piezoelectric and ferroelectric properties of Na_(0.5)Bi_(4.5)Ti_(4)O_(15)–BT composite ceramic will be enhanced much by Mg doping,which means it has a wider range of applications in electronic devices such as piezoelectric devices. | Chaobin Jiang Chao Ma Qian Luo Kanghui Liu Lu Qin Zhentao Wu Wanqiang Cao Yong Chen | 2019 | Journal of Advanced Dielectrics2019，9，1： | 0 |
| 6 | Li-air batteries:air stability of lithium metal anodes显示文摘Aprotic rechargeable lithium-air batteries(LABs)with an ultrahigh theoretical energy density(3,500 Wh kg^(-1))are known as the‘holy grail’of energy storage systems and could replace Li-ion batteries as the next-generation high-capacity batteries if a practical device could be realized.However,only a few researches focus on the battery performance and reactions in the ambient air environment,which is a major obstacle to promote the practical application of LABs.Here,we have summarized the recent research progress on LABs,especially with respect to the Li metal anodes.The chemical and electrochemical deteriorations of the Li metal anode under the ambient air are discussed in detail,and the parasitic reactions involving the cathode and electrolyte during the charge-discharge processes are included.We also provide stability perspectives on protecting the Li metal anodes and propose design principles for realizing high-performance LABs. | Renfei Cao Kai Chen Jianwei Liu Gang Huang Wanqiang Liu Xinbo Zhang | 2024 | Science China Chemistry2024，67，1： | 0 |
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