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12.6μm-Thick Asymmetric Composite Electrolyte with Superior Interfacial Stability for Solid-State Lithium-Metal Batteries

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Nano-Micro Letters 2024年第9期16卷 397-409页

作者： Zheng zhang Jingren Gou Kaixuan Cui Xin zhang yujian Yao Suqing Wang Haihui Wang Beijing Key Laboratory for Membrane Materials and Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084People’s Republic of China School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510000People’s Republic of China

Solid-state lithium metal batteries(SSLMBs)show great promise in terms of high-energy-density and high-safety performance.However,there is an urgent need to address the compatibility of electrolytes with high-voltage cathodes/Li anodes,and to minimize the electrolyte thickness to achieve highenergy-density of SSLMBs.Herein,we develop an ultrathin(12.6μm)asymmetric composite solid-state electrolyte with ultralight areal density(1.69 mg cm^(−2))for SSLMBs.The electrolyte combining a garnet(LLZO)layer and a metal organic framework(MOF)layer,which are fabricated on both sides of the polyethylene(PE)separator separately by tape casting.The PE separator endows the electrolyte with flexibility and excellent mechanical properties.The LLZO layer on the cathode side ensures high chemical stability at high voltage.The MOF layer on the anode side achieves a stable electric field and uniform Li flux,thus promoting uniform Li^(+)deposition.Thanks to the well-designed structure,the Li symmetric battery exhibits an ultralong cycle life(5000 h),and high-voltage SSLMBs achieve stable cycle performance.The assembled pouch cells provided a gravimetric/volume energy density of 344.0 Wh kg^(−1)/773.1 Wh L^(−1).This simple operation allows for large-scale preparation,and the design concept of ultrathin asymmetric structure also reveals the future development direction of SSLMBs.

关键词： Solid-state lithium metal batteries Composite solid-state electrolyte Ultrathin asymmetric structure Pouch cells

N-doped carbon nanofibers arrays as advanced electrodes for supercapacitors

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Journal of Materials Science & Technology 2020年第20期52卷 144-151页

作者： Guoxiang Pan Feng Cao yujian zhang Xinhui Xia Department of Materials Chemistry Huzhou UniversityHuzhou 313000China State Key Laboratory of Silicon Materials Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Provinceand Department of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China

The advancement of supe rcapacitors largely relies on the innovation of electrode materials with high-rate performance and ultra-long cycling stability.In this work,unique N-doped nanofibers on carbon cloth(NCNFs/CC) are prepared by an electrodepositio n-annealing method for application in supercapacitors.The as-prepared N-doped nanofibers(N-CNFs) show diameters of 100-150 nm and cross-link with each other fo rming porous conductive network.Due to enhanced conductivity and reinforced structural stability,the N-CNFs/CC arrays are demonstrated with better electrochemical performance than CNFs/CC counterpart,including higher specific capacitance(195.2 F g^-1 at a current density of 2.5 A g^-1),excellent rate capability(80.5.% capacity retention as the rate increases from 2.5-20 A g^-1) and good cycling stability(99.5.%retention after 10,000 cycles).These reinforced electrochemical properties are attributed to N-doped conductive architecture with faster ion/electron transfer paths and more active sites.Our findings may offe r a new way for construction of advanced high-rate electrodes for energy storage.

关键词： Supercapacitors Carbon fibers Electrode Porous materials Electrodeposition

Single-cell characterization of major components of plant cell walls in situ by Raman spectroscopy

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Science China Life Sciences 2024年第8期 1772-1774页

作者： yujian Li Weiwei Shen Xi zhang Yaning Cui Yuanyuan Zhao Yayu Guo Xiaojuan Li Shuizhong Wang Guoyong Song Pu Wang Jianfeng Ma Jinxing Lin State Key Laboratory of Efficient Production of Forest Resources College of Biological Sciences and TechnologyBeijing Forestry University Institute of Tree Development and Genome Editing Beijing Forestry University National Engineering Research Center of Tree Breeding and Ecological Restoration College of Biological Sciences and TechnologyBeijing Forestry University Beijing Key Laboratory of Lignocellulosic Chemistry Engineering Research Center of Forestry Biomass Materials and EnergyMinistry of EducationBeijing Forestry University Beijing Advanced Innovation Center for Biomedical Engineering School of Biological Science and Medical EngineeringBeihang University Key lab of Bamboo and Rattan Science & Technology International Center for Bamboo and Rattan

Dear Editor,Plant cell walls are complex and dynamic structures that are mainly composed of polysaccharide polymers such as cellulose,hemicellulose,and pectin,in addition to substantial amounts of the non-saccharide p...

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Implanting Ni into N-doped puffed carbon: A new advanced electrocatalyst for oxygen evolution reaction

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Chinese Chemical Letters 2020年第9期31卷 2230-2234页

作者： Feng Cao Guoxiang Pan yujian zhang Xinhui Xia Department of Materials Chemistry Huzhou UniversityHuzhou 313000China State Key Laboratory of Silicon Materials Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang ProvinceDepartment of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071China

Tailored design and synthesis of high-quality electrocatalysts is vital for the advancement of oxygen evolution reaction(OER).Herein,we report a powerful puffing method to fabricate hierarchical porous N-doped carbon with numerous embedded Ni nanoparticles.Interestingly,during the puffing and annealing process,rice precursor with N and Ni sources can be in-situ converted into Ni-embedded N-doped porous carbon(N-PC/Ni) composite.The obtained N-PC/Ni composite possesses a cross-linked porous architecture containing conductive carbon backbone and active Ni nanoparticles electrocatalysts for OER.The pore formation in N-PC/Ni composite is also proposed because of carbothermic reduction.The N-PC/Ni composite is fully studied as electrocatalysts for OER.Due to increased active surface area,enhanced electronic conductivity and reactivity,the designed N-PC/Ni composite exhibits superior OER performance with a low Tafel slope(~88 mV/dec) and a low overpotential as well as excellent long-term stability in alkaline solution.Our proposed rational design strategy may provide a new way to construct other advanced metal/heteroatom-doped composites for widespread application in electrocatalysis.

关键词： Oxygen evolution reaction Electrocatalysis Porous carbon Metal-carbon composites N doping

酿酒酵母和异常汉逊酵母混合发酵黄酒工艺研究

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中国食品学报 2024年第1期24卷 146-159页

作者：郑超群陈晨蒋予箭张蕾谢广发浙江工商大学食品与生物工程学院杭州310018 浙江树人学院生物与环境工程学院浙江省污染暴露与健康干预重点实验室杭州310015

以酿酒酵母和异常汉逊酵母为黄酒发酵菌种,分别考察2种酵母对18°Bx糖化液的发酵特性,结果表明酿酒酵母产酒精(9.9%vol)能力强于异常汉逊酵母(6.8%vol),异常汉逊酵母产挥发酯(2.41 g/L)显著高于酿酒酵母(0.53 g/L)。比较混菌发酵途径,... 详细信息

以酿酒酵母和异常汉逊酵母为黄酒发酵菌种,分别考察2种酵母对18°Bx糖化液的发酵特性,结果表明酿酒酵母产酒精(9.9%vol)能力强于异常汉逊酵母(6.8%vol),异常汉逊酵母产挥发酯(2.41 g/L)显著高于酿酒酵母(0.53 g/L)。比较混菌发酵途径,顺序混合发酵酒精度(8.1%vol)略低于同时混合发酵酒精度(8.7%vol),挥发酯含量(1.59 g/L)显著高于同时混合发酵(0.56 g/L)(P<0.05),结合发酵过程理化指标和感官评价结果,选择顺序混合发酵途径较为合适。通过单因素和Box-Benhnken中心组合试验设计,选择主发酵温度、pH值、酵母接种量3个因素对顺序混合发酵黄酒产品的挥发酯含量进行响应面优化,结果显示:顺序混合发酵黄酒的最佳参数为:发酵温度31.5℃,接种量1.0×10~7个/mL,pH 4.2。验证试验表明,在此条件下顺序混合发酵黄酒的挥发酯含量为(1.66±0.028)g/L,与预测值1.70 g/L相差不大,比酿酒酵母单独发酵提高213%。本研究为非酿酒酵母在黄酒发酵上的应用奠定了基础。

关键词：异常汉逊酵母混合菌种黄酒发酵曲线工艺优化

基于双注意力机制的MSCN-BiGRU的滚动轴承故障诊断方法

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振动与冲击 2024年第6期43卷 84-92,103页

作者：王敏邓艾东马天霆张宇剑薛原东南大学能源与环境学院南京210096 东南大学大型发电装备安全运行与智能测控国家工程研究中心南京210096

针对滚动轴承故障诊断模型在变工况和环境噪声干扰下诊断精度降低的问题,提出一种基于双注意力机制的多尺度卷积网络(dual attention and multi-scale convolutional networks,DAMSCN)与改进的双向门控循环单元(bidirectional gated rec... 详细信息

针对滚动轴承故障诊断模型在变工况和环境噪声干扰下诊断精度降低的问题,提出一种基于双注意力机制的多尺度卷积网络(dual attention and multi-scale convolutional networks,DAMSCN)与改进的双向门控循环单元(bidirectional gated recurrent unit,BiGRU)组成的故障诊断模型DAMSCN-BiGRU。首先,多尺度特征融合模块使用不同大小的卷积核,获得多种感受野,从而提取到轴承原始振动信号的多尺度特征信息,并根据重要性对其进行自适应融合,然后利用通道注意力和空间注意力组成的双注意力模块(dual attention module,DAM)对多尺度特征进行重新标定,分配注意力权重,削弱融合特征中的冗余特征;然后,增加注意力层和利用分段激活改进BiGRU进而挖掘信号的时域特征,以提高轴承故障诊断的性能;最后,通过Softmax层完成对不同故障的分类。试验结果表明,与其他智能诊断模型相比,DAMSCN-BiGRU在变工况环境下,平均诊断精度达到98.2%,在强噪声背景下仍然有着85.3%的准确率,且在不同程度的噪声强度下效果均优于其他常用模型,有利于促进滚动轴承的智能故障诊断研究和实际应用。

关键词：滚动轴承故障诊断多尺度特征融合双注意力机制双向门控循环单元(BiGRU)

改性聚丙烯酰胺降低油水界面张力行为的分子动力学模拟

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中国石油大学学报（自然科学版） 2024年第3期48卷 215-220页

作者：燕友果郝羽键伊卓李雅婧张军李振中国石油大学(华东)材料科学与工程学院山东青岛266580 中国石油化工股份有限公司北京化工研究院北京100013

采用分子动力学模拟方法,从原子分子层次考察部分水解聚丙烯酰胺(HPAM)以及改性HPAM的界面活性。结果表明:HPAM降低油水界面张力能力极其有限,而引入疏水基团后的HPAM具有较好的降低界面张力效果;改性HPAM的疏水基团增强与油相的作用,... 详细信息

采用分子动力学模拟方法,从原子分子层次考察部分水解聚丙烯酰胺(HPAM)以及改性HPAM的界面活性。结果表明:HPAM降低油水界面张力能力极其有限,而引入疏水基团后的HPAM具有较好的降低界面张力效果;改性HPAM的疏水基团增强与油相的作用,并在界面处形成致密的聚合物膜,增加油水界面层厚度,隔离油水相接触,从而降低油水接触形成的界面张力;盐离子的存在增加油水界面张力,改性HPAM引入的磺酸基团具有较好的抗盐能力,可以降低界面处盐离子的聚集,从而减弱盐离子对界面张力的影响。

关键词：改性聚丙烯酰胺界面张力分子动力学模拟

人体生物样本中有机磷类农药前处理以及检测方法的研究进展

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理化检验（化学分册） 2024年第4期60卷 440-448页

作者：陈玉婕刘华良张昊卢宇剑南京医科大学公共卫生学院南京211100 江苏省疾病预防与控制中心理化检验所南京210009

有机磷类农药是目前应用最广泛的农药类别之一,可经呼吸道、消化道、皮肤和黏膜等多途径进入人体,长期暴露会对人体的心血管系统、生殖系统、神经系统造成损伤,甚至会导致癌症。人体生物监测是评估人体环境污染物暴露水平的“金标准”,... 详细信息

有机磷类农药是目前应用最广泛的农药类别之一,可经呼吸道、消化道、皮肤和黏膜等多途径进入人体,长期暴露会对人体的心血管系统、生殖系统、神经系统造成损伤,甚至会导致癌症。人体生物监测是评估人体环境污染物暴露水平的“金标准”,通过对人体组织和体液内(血、尿、母乳等)环境化学物质及其代谢产物的分析,可以精确测量通过不同暴露途径进入人体内的环境化合物总量。为了更好地了解和评估有机磷类农药的人群暴露剂量及其对健康的影响,主要综述了人体生物样本中有机磷类农药的常用前处理方法(液液萃取法、固相萃取法、QuEChERS以及其他方法)及检测方法(气相色谱法、气相色谱-质谱法、气相色谱-串联质谱法和液相色谱-串联质谱法)(引用文献68篇)。

关键词：有机磷类农药人体生物监测前处理方法检测方法

750 kV超高压输电线路对共用走廊并行配电线路三相电压不平衡的影响分析及治理措施

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电气工程学报 2024年第1期19卷 308-315页

作者：包艳艳刘康温定筠张广东丁玉剑国网甘肃省电力公司电力科学研究院兰州730070 国网甘肃省电力公司培训中心兰州730070 中国电力科学研究院有限公司北京100192

受750 kV输电线路电磁感应影响,35 kV配电线路并行接近共用走廊的750 kV输电线路时,35 kV配电线路会出现三相电压不平衡问题,严重时会引起35 kV输电线路继电保护装置动作,影响该线路的运行可靠性,目前国内外针对该问题的治理措施报道较... 详细信息

受750 kV输电线路电磁感应影响,35 kV配电线路并行接近共用走廊的750 kV输电线路时,35 kV配电线路会出现三相电压不平衡问题,严重时会引起35 kV输电线路继电保护装置动作,影响该线路的运行可靠性,目前国内外针对该问题的治理措施报道较少。分析了并行段内不同电压等级导线间的距离、高度、并行长度等参数对35 kV线路三相电压的影响程度,提出了降低35 kV配电线路对地高度并加装屏蔽地线,在35 kV配电线路上加装并联电容器,在35 kV配电线路上加装并联电抗器等保护措施,研究结果表明,采用上述措施可有效改善35 kV配电线路三相电压不平衡问题,提升了配电线路运行可靠性和抵御电磁影响的能力,为750 kV和35 kV线路共用走廊段线路的设计标准制定提供参考方案。

关键词：电能质量共用走廊治理措施配电线路电磁影响