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Stabilizing porous micro-sized silicon anodes via construction of tough composite interface networks for high-energy-density lithium-ion batteries

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Nano Research 2024年第11期17卷 9737-9745页

作者： Lin Sun Yang Liu Liyan Wang zhidong chen Zhong Jin Key Laboratory for Advanced Technology in Envirnmental Protection of Jiangsu Province School of Chemistry and Chemical Engineering Yancheng Institute of Technology Yancheng 224051 China School of Petrochemical Engineering Changzhou University Changzhou 213164 China State Key Laboratory of Coordination Chemistry MOE Key Laboratory of Mesoscopic Chemistry MOE Key Laboratory of High Performance Polymer Materials and Technology Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China

Compared to nanostructured Si/C materials, micro-sized Si/C anodes for lithium-ion batteries (LIBs) have gained significant attention in recent years due to their higher volumetric energy density, reduced side reactions and low costs. However, they suffer from more severe volume expansion effects, making the construction of stable micro-sized Si/C anode materials crucial. In this study, we proposed a simple wet chemistry method to obtain porous micro-sized silicon (μP-Si) from waste AlSi alloys. Then, the μP-Si@carbon nanotubes (CNT)@C composite anode with high tap density was prepared by wrapping with CNT and coated with polyvinylpyrrolidone (PVP)-derived carbon. Electrochemical tests and finite element (FEM) simulations revealed that the introduction of CNTs and PVP-derived carbon synergistically optimize the stability and overall performance of the μP-Si electrode via construction of tough composite interface networks. As an anode material for LIBs, the μP-Si@CNT@C electrode exhibits boosted reversible capacity (∼ 3500 mAh·g^(−1) at 0.2 A·g^(−1)), lifetime and rate performance compared to pure μP-Si. Further full cell assembly and testing also indicates that μP-Si@CNT@C is a highly promising anode, with potential applications in future advanced LIBs. It is expected that this work can provide valuable insights for the development of micro-sized Si-based anode materials for high-energy-density LIBs.

关键词： micro silicon anode carbon coating carbon nanotube lithium-ion battery

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Facile Synthesis of Carbon-Supported Ultrasmall Ag@Pd Core-Shell Nanocrystals with Superior Electrocatalytic Activity for Direct Formic Acid Fuel Cell Application

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Chinese Journal of Chemistry 2016年第11期34卷 1086-1092页

作者： Jianyu Cao Zhentao Zhu Weifang Zhao Juan Xu zhidong chen Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology School of Petrochemical Engineering Changzhou University Changzhou Jiangsu 213164 China Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering School of Materials Science and Engineering Changzhou University Changzhou Jiangsu 213164 China

To design electrocatalysts with excellent performance, morphology, composition and structure is a decisive influential factor. In this work, ultrasmall Ag@Pd core-shell nanocrystals supported on Vulcan XC72R carbon with different Ag/Pd atomic ratios are synthesized via a facile successive reduction approach with formaldehyde and eth- ylene glycol as reducing agents, respectively. The Ag-core/Pd-shell nanostructures are revealed by high-resolution transmission electron microscopy （HRTEM）. Ag@Pd core-shell nanocrystals possess a narrow size distribution with an average size of ca. 4.3 nm. In comparison to monometallic Pd/C and commercial Pd black catalysts, such Ag@Pd core-shell nanocrystals display excellent electrocatalytic activities for formic acid oxidation, which may be due to high Pd utilization derived from the formation of Ag@Pd core-shell nanostructure and the strong interaction between Ag and Pd.

关键词： core-shell nanoparticles electrocatalyst formic acid electrooxidation direct formic acid fuel cell

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Tartary buckwheat(Fagopyrum tataricum(L.)Gaertn)protein-derived antioxidant peptides:mechanisms of action and structure-activity relationship in Caco-2 cell models

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Food Science and Human Wellness 2022年第6期11卷 1580-1590页

作者： Yiming Zhou Xuanming She zhidong chen Yun Wei Ying Xiao Xiaoli Zhou School of Perfume and Aroma Technology Shanghai Institute of TechnologyShanghai 201418China University Think Tank of Shanghai Municipality Institute of Beautiful China and Ecological CivilizationShanghai 201418China

Excessive reactive oxygen species(ROS)can cause oxidative damage and lead to various metabolic *** buckwheat(Fagopyrum tataricum(L.)Gaertn)is a new kind of protein-rich functional food,the protein in which has been proved to have good antioxidant *** this study,in order to further explore the antioxidant mechanism of Tartary buckwheat protein,4 peptides(CR-8,LR-8,GK-10 and SR-12)were isolated and identified from it.H2 O2 was used to induce oxidative damage to Caco-2 cells to evaluate antioxidant capacity of these *** results of superoxide dismutase(SOD),total antioxidant capacity(T-AOC)and mitochondrial membrane potential *** that these peptides have superior antioxidant ***-8 has the best antioxidant *** order to further clarify the antioxidant mechanism of CR-8,metabolomics was used to analyze related metabolites and metabolic *** results showed that after CR-8 intervention,the content of metabolites such as L-acetyl carnitine has *** indicated that CR-8 can improve the antioxidant capacity of damaged cells by intervening in multiple metabolic *** also revealed the anti-oxidant mechanism of tartary buckwheat *** conclusion,it provided a theoretical basis for further studying the activity of tartary buckwheat portein and utilizing buckwheat resources.

关键词： Antioxidant protective Tartary buckwheat peptides Metabolic mechanim Caco-2 cells

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Efficient Photoelectrochemical Water Splitting by g-C_3N_4/TiO_2 Nanotube Array Heterostructures

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Nano-Micro Letters 2018年第2期10卷 247-259页

作者： Changhai Liu Fang Wang Jin Zhang Ke Wang Yangyang Qiu Qian Liang zhidong chen School of Materials Science and Engineering Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou University School of Petrochemical Engineering Changzhou University

Well-ordered TiO_2 nanotube arrays(TNTAs)decorated with graphitic carbon nitride(g-C_3N_4) were fabricated by anodic oxidization and calcination ***, TNTAs were prepared via the anodic oxidation of Ti foil in glycerol solution containing fluorinion and 20%deionized water. Subsequently, g-C_3N_4 film was hydrothermally grown on TNTAs via the hydrogen-bonded cyanuric acid melamine supramolecular complex. The results showed that g-C_3N_4 was successfully decorated on the TNTAs and the g-C_3N_4/TNTAs served as an efficient and stable photoanode for photoelectrochemical water splitting. The facile deposition method enables the fabrication of efficient and low-cost photoanodes for renewable energy applications.

关键词： TiO2 nanotube arrays Graphitic carbon nitride(g-C3N4) Heterojunction Photoelectrochemical Water splitting

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Polyphenol-based hydrogels: Pyramid evolution from crosslinked structures to biomedical applications and the reverse design

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Bioactive Materials 2022年第11期7卷 49-70页

作者： Zimu Li zhidong chen Hongzhong chen Kebing chen Wei Tao Xiao-kun Ouyang Lin Mei Xiaowei Zeng Institute of Pharmaceutics School of Pharmaceutical Sciences(Shenzhen)Sun Yat-sen UniversityShenzhen518107China Department of Spine Surgery Center for Orthopaedic SurgeryThe Sixth Affiliated Hospital of Sun Yat-sen UniversityGuangzhou510655China Center for Nanomedicine Brigham and Women’s HospitalHarvard Medical SchoolBostonMA02115United States School of Food and Pharmacy Zhejiang Ocean UniversityZhoushan316022China

As a kind of nature-derived bioactive materials, polyphenol-based hydrogels possess many unique and outstanding properties such as adhesion, toughness, and self-healing due to their specific crosslinking structures, which have been widely used in biomedical fields including wound healing, antitumor, treatment of motor system injury, digestive system disease, oculopathy, and bioelectronics. In this review, starting with the classi-fication of common polyphenol-based hydrogels, the pyramid evolution process of polyphenol-based hydrogels from crosslinking structures to derived properties and then to biomedical applications is elaborated, as well as the efficient reverse design considerations of polyphenol-based hydrogel systems are proposed. Finally, the existing problems and development prospects of these hydrogel materials are discussed. It is hoped that the unique perspective of the review can promote further innovation and breakthroughs of polyphenol-based hydrogels in the future.

关键词： Biomaterials Adhesive hydrogels Polyphenol Disease treatment Reverse design

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Ultra-lightweight and wide field of view augmented reality virtual retina display based on optical fiber projector and volume holographic lens

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Chinese Optics Letters 2019年第9期17卷 38-42页

作者： zhidong chen Xinzhu Sang Hui Li Yuan Wang Linmin Zhao State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications

A novel see-through virtual retina display(VRD) system is proposed in this Letter. An optical fiber projector is used as the thin-light-beam source, which is modified from a laser scan projector by separating the laser sources and the scan mechanical structure. A synthetic aperture method is proposed for simple, low-cost fabrication of a volume holographic lens with large numerical aperture. These two key performance-enhanced elements are integrated into a lightweight and ordinary-glasses-like optical see-through VRD system. The proposed VRD system achieves a weight of 30g and a diagonal field of view of 60°.

关键词： Ultra-lightweight virtual retina display(VRD) An optical fiber projector

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考虑用户出行成本预算的电力-交通耦合网络充电站定价策略

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电力系统自动化 2024年第7期48卷 201-209页

作者：谢龙韬谢仕炜陈铠悦张亚超陈之栋福州大学电气工程与自动化学院福建省福州市350108

随着电动汽车的规模化发展,研究如何有效考虑用户的出行行为机理并制定合理的充电站充电价格,对电力-交通网络的协同优化调度具有重大意义。针对此问题,提出了考虑用户出行成本预算的电力-交通耦合网络充电站定价策略。首先,建立考虑出... 详细信息

随着电动汽车的规模化发展,研究如何有效考虑用户的出行行为机理并制定合理的充电站充电价格,对电力-交通网络的协同优化调度具有重大意义。针对此问题,提出了考虑用户出行成本预算的电力-交通耦合网络充电站定价策略。首先,建立考虑出行成本预算的交通用户均衡模型,将均衡状态通过变分不等式进行等效描述,从而对电动汽车出行需求和充电行为进行刻画。其次,构建考虑功率削减的配电网二阶锥优化模型,将充电站定价问题转化为含有变分不等式约束的优化问题,并根据问题设计交替迭代算法和外梯度算法进行求解。最后,通过算例对所提模型和方法的有效性进行验证,结果表明了考虑出行成本预算对耦合网络充电定价的必要性。

关键词：电动汽车电力-交通耦合网络变分不等式出行成本预算交通用户均衡充电站定价

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考虑混合需求不确定性的电力-交通耦合网络最优定价策略

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中国电机工程学报 2023年第22期43卷 8652-8665页

作者：谢仕炜张亚超舒胜文陈之栋仉梦林福州大学电气工程与自动化学院福建省福州市350108 中国地质大学自动化学院湖北省武汉市430074

随着电力网与交通网融合的不断加深,研究如何制定有效策略来优化整体系统具有重要意义。依托变分不等式,提出计及混合需求不确定性的电力–交通耦合网络最优定价策略,以引导系统在不确定风险下实现最优运行状态。首先研究了促进交通系... 详细信息

随着电力网与交通网融合的不断加深,研究如何制定有效策略来优化整体系统具有重要意义。依托变分不等式,提出计及混合需求不确定性的电力–交通耦合网络最优定价策略,以引导系统在不确定风险下实现最优运行状态。首先研究了促进交通系统最优运行的路段拥堵收费策略,从理论上说明该策略能够引导和改变用户的行为,实现系统的最优运行状态。其次,提出耦合网络的最优定价模型,并推导其等价变分不等式形式。在此基础上,提出考虑混合需求不确定性的电力–交通耦合网络鲁棒定价模型及其等价变分不等式形式,从而将复杂鲁棒优化问题转化为变分不等式问题进行求解,为电力–交通耦合网络的复杂鲁棒优化问题提供新的解决思路。最后,仿真基于耦合测试系统,验证了所提方法的有效性。

关键词：最优定价变分不等式电力-交通耦合网络混合用户均衡

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城市轨道交通车辆两种受电弓跟随性试验研究

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城市轨道交通研究 2017年第2期20卷 32-37页

作者：闫海城陈志东中车长春轨道客车股份有限公司电气研发部长春工程师130062

为了研究城市轨道交通车辆不同驱动方式受电弓的跟随性,分别对气缸驱动弹簧受电弓和电推杆弹簧受电弓进行跟随性试验研究。试验结果表明:两种驱动方式受电弓的跟随性均随着弓网间相互作用频率的增大而变差;在受电弓自振频率附近均出现... 详细信息

为了研究城市轨道交通车辆不同驱动方式受电弓的跟随性,分别对气缸驱动弹簧受电弓和电推杆弹簧受电弓进行跟随性试验研究。试验结果表明:两种驱动方式受电弓的跟随性均随着弓网间相互作用频率的增大而变差;在受电弓自振频率附近均出现跟随性变弱的趋势;随着平均接触力增加,受电弓跟随性趋好;不同驱动方式受电弓在不同频率范围内的跟随性优劣不同。

关键词：城市轨道交通车辆受电弓驱动方式跟随性试验

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分子印迹聚吡咯/Fe_3O_4复合材料的制备及其在识别色氨酸光学异构体中的应用

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色谱 2012年第4期30卷 423-427页

作者：陈智栋单学凌孔泳常州大学石油化工学院江苏常州213164 南京大学化学化工学院江苏南京210093

首先利用共沉淀法合成了磁性材料Fe3O4,再以吡咯为单体,L-色氨酸为模板分子,采用化学聚合法使吡咯在Fe3O4表面发生原位聚合,同时通过分子间的作用力以及氢键作用将模板分子掺杂到Fe3O4表面的聚吡咯中,从而制备了分子印迹聚吡咯/Fe3O4复... 详细信息

首先利用共沉淀法合成了磁性材料Fe3O4,再以吡咯为单体,L-色氨酸为模板分子,采用化学聚合法使吡咯在Fe3O4表面发生原位聚合,同时通过分子间的作用力以及氢键作用将模板分子掺杂到Fe3O4表面的聚吡咯中,从而制备了分子印迹聚吡咯/Fe3O4复合材料,并且利用该材料的磁性质实现固液分离。在1 mol/L的NaOH溶液中,通过施加1 V的电位使聚吡咯发生过氧化从而使L-色氨酸模板分子脱掺杂。根据分子印迹的原理,该分子印迹的复合材料可用于识别L-色氨酸光学异构体。将扫描电镜、X射线衍射及电化学法用于该分子印迹复合材料的表征。将该材料填入到多孔陶瓷管,将L-和D-色氨酸溶液分别流过该多孔陶瓷管,流出液用高效液相色谱检测,发现该复合材料对于L-色氨酸的富集能力接近D-色氨酸的两倍,说明该复合材料具有作为手性识别色谱固定相的潜力。

关键词：聚吡咯/Fe3O4复合材料色氨酸光学异构体识别色谱固定相

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