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Hollow multishelled structural TiN as multi-functional catalytic host for high-performance lithium-sulfur batteries

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Nano Research 2023年第11期16卷 12745-12752页

作者： Wei Xu ruyi bi Mei Yang Jiangyan Wang Ranbo Yu Dan Wang State Key Laboratory of biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of biopharmaceutical Preparation and Delivery Chinese Academy of SciencesBeijing 100190China

Lithium-sulfur(Li-S)battery has attracted extensive attention because of its ultrahigh theoretical energy density and low cost.However,its commercialization is seriously hampered by its short cycling life,mainly due to the shuttle of soluble lithium polysulfides(LiPSs)and poor rate capability due to sluggish reaction kinetics.Although significant efforts have been devoted to solving the problems,it is still challenging to simultaneously address all the issues.Herein,titanium nitride hollow multishelled structure(TiN HoMS)sphere is designed as a multi-functional catalytic host for sulfur cathode.TiN,with good conductivity,can effectively catalyze the redox conversion of S and LiPSs,while its surficial oxidation passivation layer can strongly anchor LiPSs.Besides,HoMS enables TiN nanoparticle subunits to expose abundant active sites for anchoring and promoting conversion of LiPSs,while the multiple shells provide physical barriers to restrict the shuttle effect.In addition,HoMS can buffer the volume expansion of sulfur and shorten the charge transport pathway.As a result,the sulfur cathode based on triple-shelled TiN HoMS exhibits an initial specific capacity of 1016 mAh·g-1 at a high sulfur loading of 2.8 mg·cm-2 and maintains 823 mAh·g-1 after 100 cycles.Moreover,it shows a four times higher specific capacity than the one without TiN host at 2 C.

关键词： lithium-sulfur batteries titanium nitride hollow multishelled structure shuttle effect rate capability

中空多壳层结构TiN修饰隔膜对锂硫电池性能的增强

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科学通报 2024年第16期69卷 2298-2307页

作者：徐伟毕如一杨梅王江艳于然波王丹中国科学院过程工程研究所生化工程国家重点实验室北京100190 北京科技大学冶金与生态工程学院北京100083 中国科学院大学化学工程学院北京100049 生物药制备与递送重点实验室(中国科学院) 北京100190

锂硫电池(lithium-sulfur(Li-S)batteries)具有远高于锂离子电池的理论比容量.然而,硫的导电性差,充放电过程中体积变化剧烈,其放电中间产物易溶于电解液并穿过隔膜,造成穿梭效应,导致锂硫电池的实测比容量低、循环寿命短.本文设计构筑... 详细信息

锂硫电池(lithium-sulfur(Li-S)batteries)具有远高于锂离子电池的理论比容量.然而,硫的导电性差,充放电过程中体积变化剧烈,其放电中间产物易溶于电解液并穿过隔膜,造成穿梭效应,导致锂硫电池的实测比容量低、循环寿命短.本文设计构筑了中空多壳层结构氮化钛(TiNHoMS),作为锂硫电池隔膜修饰材料,有效解决了上述难题.氮化钛具有优异的导电性,能够催化硫和多硫化锂的氧化还原转化.HoMS具有多个壳层和多层内部空腔,能提供多重空间阻隔和丰富的多硫化锂吸附位点,从而有效抑制穿梭效应,并且能够缩短电子/离子传输路径.得益于此,采用三壳层TiNHoMS修饰隔膜的锂硫电池性能显著提高,远优于采用未修饰隔膜电池的性能.测试结果表明,在1 C电流下,初始比容量由642 mAh/g提高到1134 mAh/g,而且300次循环后比容量仍保持在792 mAh/g.通过一系列电化学表征分析发现,TiNHoMS提高了隔膜对电解液的浸润性,催化了硫正极的氧化还原反应,抑制了多硫化锂的穿梭效应,从而有效地提高了锂硫电池的比容量和循环稳定性.

关键词：中空多壳层结构氮化钛隔膜修饰锂硫电池穿梭效应

四阶线性方程极弱局部间断Galerkin法傅里叶分析

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黑龙江大学自然科学学报 2024年第2期41卷 150-156页

作者：王如意毕卉刘威哈尔滨理工大学理学院哈尔滨150080

主要研究了四阶线性方程极弱局部间断Galerkin方法的傅里叶误差分析问题。首先,给出四阶线性方程的极弱局部间断Galerkin空间离散格式,并在周期边界条件及一致网格的条件下将离散格式表示为差分形式,然后,在k=2的情况下,利用傅里叶分析... 详细信息

主要研究了四阶线性方程极弱局部间断Galerkin方法的傅里叶误差分析问题。首先,给出四阶线性方程的极弱局部间断Galerkin空间离散格式,并在周期边界条件及一致网格的条件下将离散格式表示为差分形式,然后,在k=2的情况下,利用傅里叶分析方法分析其稳定性及其误差估计问题,最后,利用数值实验,分别对得到的结果进行验证。

关键词：四阶线性方程极弱局部间断Galerkin 傅里叶分析稳定性分析误差估计

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Nanostructured biVO4 Derived from bi-MOF for Enhanced Visible-light Photodegradation

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Chemical Research in Chinese Universities 2020年第1期36卷 120-126页

作者： CHEN Jianfei CHEN Xiaoyu ZHANG Xing YUAN Yao bi ruyi YOU Feifei WANG Zumin YU Ranbo Department of Physical Chemistry School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing 100083P.R.China State Key Laboratory of biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190P.R.China Key Laboratory of Advanced Material Processing&Mold Ministry of EducationZhengzhou UniversityZhengzhou 450002P.R.China

biVO4,a promising visible-light responding photocatalyst,has aroused extensive research interest because of inexpensiveness and excellent chemical stability.However,its main drawback is the poor photoinduced charge-transfer dynamics.Building nanostructures is an effective way to tackle this problem.Herein,we put forward a new method to prepare nanostructured biVO4 from bi-based metal-organic frameworks[bi-MOF(CAU-17)]precursor.The as-prepared material has a rod-like morphology inherited from the bi-MOF sacrificial template and consists of small nanoparticle as building blocks.Compared with its counterparts prepared by conventional methods,MOF-derived nanostructured biVO4 shows better light absorption ability,narrower bandgap,and improved electrical conductivity as well as reduced recombination.Consequently,biVO4 nanostructure demonstrates high photocatalytic activity under visible light towards the degradation of methylene blue.Methylene blue can be degraded up to 90%within 30 min with a reaction rate constant of 0.058 min-1.Moreover,the cycling stability of the catalyst is excellent to withstand unchanged degradation efficiency for at least 5 cycles.

关键词： biVO4 Nanostructure Metal-organic framework Ternary metal oxide Photocatalysis

Mild hyperthermia synergized chemotherapy by bi_(2)Se_(3)/MoSe_(2)nanosaucers for cancer treatment with negligible thermal resistance

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Nano Research 2022年第9期15卷 8270-8280页

作者： Fei Gao Tingbin Zhang Yuqing Miao Huijun Ma Hui Guo ruyi Jin Zhi Li Haifang Wang Haiming Fan Lingyun Zhao Institute of Integrative Medicine Shaanxi University of Chinese MedicineXi'an 712046China Key Laboratory of Advanced Materials Ministry of Education of ChinaSchool of Materials Science&EngineeringTsinghua UniversityBeijing 100084China College of Pharmacy Shaanxi University of Chinese MedicineXi'an 712046China Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education College of Chemistry and Materials ScienceNorthwest UniversityXi’an 710069China Shaanxi Key Laboratory of Integrative Traditional Chinese and Western Medicine for Prevention and Treatment of Cardiovascular Diseases Institute of Integrative MedicineShaanxi University of Chinese MedicineXi'an 712046China

Harsh photothermal temperatures(>50℃)caused heating damage to the normal tissues and induced thermal resistance in cancer cells,which significantly limited the safety and efficacy of photothermal therapy(PTT)in cancer treatment.Mild hyperthermia(bined with chemotherapy might solve this issue.Herein,a novel transition metal dichalcogenides nanostructure,namely,bi_(2)Se_(3)/MoSe_(2)nanosaucers(BMNSs),was designed to produce mild photo-hyperthermia(mPTT)and combined with chemotherapy to improve the overall antitumor efficacy.The BMNSs were constituted by bi_(2)Se_(3)hexagonal nanoplates and enclosed with MoSe_(2)nanosheets evenly.While the MoSe_(2)moiety endowed the nanoplatform with excellent photothermal efficacy,the bi_(2)Se_(3)substrates provided large specific surface area to anchor more doxorubicin(DOX)molecules as chemotherapeutic agent.Under the stimuli of mPTT/tumor acidic microenvironment,the tumor-specific drug release and the enhanced chemotherapy could be realized,showing impressive therapeutic outcomes against 4T1 cells.The synergetic therapeutic mechanism might be attributed to the mPTT induced cell membrane permeability,and interestingly,the expression of heat shock proteins 70 was not elevated obviously after the synergetic therapy,thus to avoid the tumor thermal resistance and further improve the therapeutic effect.The in vivo anti-tumoral performance of the BMNSs was further studied and complete tumor eradication was achieved without any recurrence and biotoxicity.Not only demonstrating a paradigm of high therapeutic efficacy of mild hyperthermia and synergistic chemotherapy for precise cancer therapy,our findings proved that the cancer therapeutic effect can be improved with minimal side effects through exquisite designing of the microstructures and the physiochemical properties of the nanoplatform.

关键词： mild hyperthermia MoSe_(2)/bi_(2)Se_(3)nanosaucers thermal resistance heat shock proteins 70

中空多壳层CoFe_(2)O_(4)的制备及锂离子电池性能研究

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高等学校化学学报 2023年第1期44卷 272-279页

作者：毕如一赵吉路王江艳于然波王丹北京科技大学冶金与生态工程学院物理化学系北京100083 中国科学院过程工程研究所生化工程国家重点实验室北京100190 中国科学院大学化学工程学院北京100049

以二元金属氧化物CoFe_(2)O_(4)为研究对象,通过次序模板法制备了CoFe_(2)O_(4)中空多壳层结构(HoMS)材料;对其形貌、结构进行了表征;考察了壳层结构与电化学性能之间的关系.电化学测试结果表明,双壳层-核CoFe_(2)O_(4)中空球具有最高... 详细信息

以二元金属氧化物CoFe_(2)O_(4)为研究对象,通过次序模板法制备了CoFe_(2)O_(4)中空多壳层结构(HoMS)材料;对其形貌、结构进行了表征;考察了壳层结构与电化学性能之间的关系.电化学测试结果表明,双壳层-核CoFe_(2)O_(4)中空球具有最高的放电比容量(1354.4 mA·h/g)、优异的倍率性能和循环稳定性,其独特的结构优势和最优的空腔体积占有率使其在多次循环过程中能始终保持结构和电化学性质的稳定.

关键词：中空多壳层结构 CoFe_(2)O_(4) 锂离子电池比容量循环稳定性

巨噬细胞极化在眼科疾病发生发展过程中的作用机制研究进展

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眼科新进展 2022年第3期42卷 239-243页

作者：屈如意周梦贤毕宏生郭大东山东中医药大学山东省济南市250014 山东省中西医结合眼病防治重点实验室山东省眼病防治研究院山东省济南市250002

巨噬细胞是单核吞噬细胞系统的主要细胞群,充当先天性免疫和适应性免疫的哨兵。在微环境信号作用下,巨噬细胞可被不同的激活物极化为不同功能的M1型、M2型巨噬细胞。巨噬细胞极化既可以发生在生理条件下,也可以发生在病理条件下,并贯穿... 详细信息

巨噬细胞是单核吞噬细胞系统的主要细胞群,充当先天性免疫和适应性免疫的哨兵。在微环境信号作用下,巨噬细胞可被不同的激活物极化为不同功能的M1型、M2型巨噬细胞。巨噬细胞极化既可以发生在生理条件下,也可以发生在病理条件下,并贯穿疾病发生、发展以及转归的全过程。很多眼科疾病的病理过程都和巨噬细胞极化密切相关,巨噬细胞极化及炎症因子介导的免疫反应是眼病发生的重要机制。本文简要综述了巨噬细胞的不同极化表型以及调节巨噬细胞极化平衡为治疗靶点在年龄相关性黄斑变性、自身免疫性葡萄膜炎、视网膜病变、干燥综合征以及角膜炎等眼科疾病中发挥的作用。

关键词：巨噬细胞极化年龄相关性黄斑变性自身免疫性葡萄膜炎视网膜病变干燥综合征角膜炎

miR-30b-5p抑制Notch信号通路活化对实验性自身免疫性葡萄膜炎的治疗作用

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眼科新进展 2022年第2期42卷 99-103页

作者：殷学伟郭励劼周梦贤屈如意毕宏生郭大东山东中医药大学山东省济南市250014 首都医科大学北京市100069 山东中医药大学附属眼科医院山东省济南市250002 山东省中西医结合眼病防治重点实验室山东省高校中西医结合眼病防治技术(强化)重点实验室山东省眼病防治研究院山东省济南市250002

目的探讨miR-30b-5p对实验性自身免疫性葡萄膜炎(EAU)大鼠Notch信号通路活化的调控机制及治疗作用。方法通过Target Scan(http//***/)对Notch1和Dll4基因与miR-30b的关系进行生物信息学预测。将雌性Lewis大鼠随机分为对照组、EAU组、miR... 详细信息

目的探讨miR-30b-5p对实验性自身免疫性葡萄膜炎(EAU)大鼠Notch信号通路活化的调控机制及治疗作用。方法通过Target Scan(http//***/)对Notch1和Dll4基因与miR-30b的关系进行生物信息学预测。将雌性Lewis大鼠随机分为对照组、EAU组、miR-30b-5p组和miR-30b-5p空载体(miR-30b-5p-N)组。EAU组、miR-30b-5p组和miR-30b-5p-N组大鼠首先诱导EAU模型,miR-30b-5p组和miR-30b-5p-N组大鼠分别采用携带miR-30b-5p和miR-30b-5p-N的慢病毒于EAU大鼠脾脏进行注射干预处理,EAU组大鼠于同一部位注射相同体积的生理盐水。处理后12 d,实时荧光定量PCR检测4组大鼠脾脏、淋巴结和眼组织中Notch1和Dll4 mRNA的表达;免疫组织化学检测4组大鼠脾脏、淋巴结及眼组织中Notch1和Dll4蛋白的表达,分析miR-30b-5p对葡萄膜炎大鼠Notch信号通路的调控作用。结果生物信息学预测分析结果表明,Notch信号通路上Notch1和Dll4基因均为miR-30b调控的靶基因。免疫后12 d,相比于对照组,EAU组、miR-30b-5p组和miR-30b-5p-N组大鼠脾脏、淋巴结和眼组织中Notch1和Dll4 mRNA水平均升高(均为P<0.05);经miR-30b-5p干预治疗后,miR-30b-5p组脾脏、淋巴结和眼组织中Notch1和Dll4 mRNA表达均显著降低(均为P<0.05)。免疫组织化学检测结果显示,免疫后12 d,EAU组、miR-30b-5p组和miR-30b-5p-N组大鼠脾脏、淋巴结和眼组织中Notch1和Dll4蛋白表达均上调(均为P<0.05);miR-30b-5p干预治疗后,脾脏、淋巴结和眼组织中Notch1和Dll4蛋白表达均显著下调(均为P<0.05)。结论miR-30b-5p可明显下调EAU大鼠各组织中Notch1和Dll4等Notch信号通路相关分子的表达进而抑制Notch信号通路活化,从而达到治疗葡萄膜炎的作用。

关键词：实验性自身免疫性葡萄膜炎 miR-30b-5p Notch1 Dll4 Notch信号通路

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双通道决策信息融合下的微表情识别

西安电子科技大学学报 2022年第4期49卷 127-133页

作者：戎如意薛珮芸白静贾海蓉谢娅利太原理工大学信息与计算机学院山西太原030024

微表情作为揭示潜在情绪的一个重要通道,是一种无意识的、不受大脑控制的非语言面部信息,能够反映人们最真实的心理感受和心理状态。但是,微表情存在动作幅度小且快速出现、不易被捕捉等特性,使得单一模态的微表情识别准确率难以提升。... 详细信息

微表情作为揭示潜在情绪的一个重要通道,是一种无意识的、不受大脑控制的非语言面部信息,能够反映人们最真实的心理感受和心理状态。但是,微表情存在动作幅度小且快速出现、不易被捕捉等特性,使得单一模态的微表情识别准确率难以提升。针对上述问题,提出一种微表情面部颜色特征提取算法,并将其提取的特征与微表情纹理特征进行决策融合,从而构成微表情双模态情感识别模型。该模型首先通过均匀动态纹理识别方法从经过预处理的微表情数据中提取相应的纹理特征;其次计算微表情两帧序列图片的每一个像素点之间的Lab色差,由此获得面部的颜色特征,并对其进行嵌入式特征选择以剔除冗余的特征;然后分别训练两种模态的分类器,并将两种模态训练得到的分类信息进行决策融合;最后得到微表情情绪分类结果。模型在微表情数据集CAMSEⅡ和SMIC上进行了实验。实验结果表明,微表情的纹理单模态和面部颜色单模态的平均识别准确率约为64.73%、51.64%和63.58%、50.48%,而决策融合后微表情情绪的识别结果约为68.11%和66.43%,高于融合前微表情的识别准确率,说明文中提出的微表情双模态情感识别模型明显提高了微表情的识别能力。

关键词：面部颜色特征纹理特征欧拉视频放大特征选择决策融合