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Shenzhen Key Laboratory of Organic Optoelectromagnetic Functional materials

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Frontiers of physics 2021年第1期16卷 F0003-F0003页

作者： Key Contact School of Advanced Materials Director Shenzhen Key Laboratory of Organic Optoelectromagnetic Functional Materials

Overview Shenzhen Key Laboratory of Organic Optoelectromagnetic Functional materials was established in 2014 and is located at the University Town of Shenzhen.The laboratory provides leading materials,technological process and equipment supports in organic electronics research,including the synthesis of functional organic small molecules and polymers,design and fabrication of organic electronic devices,and the application demonstration of organic electronics.

关键词： Functional synthesis Key

Monitoring the morphology evolution of LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2)during high-temperature solid state synthesis via in situ SEM

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Journal of Energy Chemistry 2022年第3期31卷 9-15,I0001页

作者： Liang Tang Xiaopeng Cheng Rui Wu Tianci Cao Junxia Lu Yuefei Zhang Ze Zhang Institute of Microstructure and Property of advanced materials Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China Institute of Laser Engineering Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China school of materials Science and Engineering Zhejiang UniversityHangzhou 310058ZhejiangChina

The particle morphology determined by the sintering process is the director factor affecting the electrochemical performance of Ni-rich NMC cathode materials.To prepare the ideal NMC particles,it is of great significance to understand the morphological changes during sintering process.In this work,the morphology evolution of LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2)(NMC811)synthesis at temperature ranging from 300–1080℃were observed by in situ SEM.The uniform mixture of spherical Ni_(0.8)Mn_(0.1)Co_(0.1)(OH)_(2)precursor and lithium sources(LiOH)was employed by high temperature solid-state process inside the SEM,which enables us to observe morphology changes in real time.The results show that synthetic reaction of LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2)usually includes three processes:the raw materials’dehydration,oxidation,and combination,accompanied by a significant reduction in particle size,which is important reference to control the synthesis temperature.As heating temperature rise,the morphology of mixture also changed from flake to brick-shaped.However,Ni nanoparticle formation is apparent at higher temperature~1000℃,suggesting a structural transformation from a layered to a rock-salt-like structure.Combining the in-situ observed changes in size and morphology,and with the premise of ensuring the morphology change from flakes to bricks,reducing the sintering temperature as much as possible to prevent excessive reduction in particle size and layered to a rock-salt structure transformation is recommended for prepare ideal NMC particles.

关键词： Lithium-ion battery NMC cathode In situ SEM High temperature imaging Particle morphology

Architecture Design and Interface Engineering of Self-assembly VS_(4)/rGO Heterostructures for Ultrathin Absorbent

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Nano-Micro Letters 2022年第4期14卷 222-237页

作者： Qi Li Xuan Zhao Zheng Zhang Xiaochen Xun Bin Zhao Liangxu Xu Zhuo Kang Qingliang Liao Yue Zhang Academy for advanced Interdisciplinary Science and Technology Beijing Advanced Innovation Center for Materials Genome EngineeringBeijing Key Laboratory for Advanced Energy Materials and TechnologiesSchool of Materials Science and EngineeringUniversity of Science

The employment of microwave absorbents is highly desirable to address the increasing threats of electromagnetic pollution.Importantly,developing ultrathin absorbent is acknowledged as a linchpin in the design of lightweight and flexible electronic devices,but there are remaining unprecedented challenges.Herein,the self-assembly VS_(4)/rGO heterostructure is constructed to be engineered as ultrathin microwave absorbent through the strategies of architecture design and interface engineering.The microarchitecture and heterointerface of VS_(4)/rGO heterostructure can be regulated by the generation of VS_(4) nanorods anchored on rGO,which can effectively modulate the impedance matching and attenuation constant.The maximum reflection loss of 2VS_(4)/rGO40 heterostructure can reach−43.5 dB at 14 GHz with the impedance matching and attenuation constant approaching 0.98 and 187,respectively.The effective absorption bandwidth of 4.8 GHz can be achieved with an ultrathin thickness of 1.4 mm.The far-reaching comprehension of the heterointerface on microwave absorption performance is explicitly unveiled by experimental results and theoretical calculations.Microarchitecture and heterointerface synergistically inspire multi-dimensional advantages to enhance dipole polarization,interfacial polarization,and multiple reflections and scatterings of microwaves.Overall,the strategies of architecture design and interface engineering pave the way for achieving ultrathin and enhanced microwave absorption materials.

关键词： Architecture design Interface Self-assembly Microwave absorption

Wannier–Koopmans method calculations for transition metal oxide band gaps

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npj Computational materials 2020年第1期6卷 1405-1412页

作者： Mouyi Weng Feng Pan Lin-Wang Wang school of advanced materials Peking University Shenzhen Graduate School518055 ShenzhenPeople’s Republic of China materials Science Division Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA

The widely used density functional theory(DFT)has a major drawback of underestimating the band gaps of materials.Wannier–Koopmans method(WKM)was recently developed for band gap calculations with accuracy on a par with more complicated methods.WKM has been tested for main group covalent semiconductors,alkali halides,2D materials,and organic crystals.Here we apply the WKM to another interesting type of material system:the transition metal(TM)oxides.

关键词： materials methods transition

Recent progress in single-atom nanozymes research

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Nano Research 2023年第2期16卷 1878-1889页

作者： Bing Jiang Zhanjun Guo Minmin Liang Experimental Center of advanced materials School of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China

Single-atom nanozyme(SAzyme)is the hot topic of the current nanozyme research.Its intrinsic properties,such as high activity,stability,and low cost,present great substitutes to natural enzymes.Moreover,its fundamental characteristics,i.e.,maximized atom utilizations and well-defined geometric and electronic structures,lead to higher catalytic activities and specificity than traditional nanozymes.SAzymes have been applied in many biomedical areas,such as anti-tumor therapy,biosensing,antibiosis,and anti-oxidation therapy.Here,we will discuss a series of representative examples of SAzymes categorized by their biomedical applications in this review.In the end,we will address the future opportunities and challenges SAzymes facing in their designs and applications.

关键词： single-atom nanozymes natural enzymes enzyme-like activity biomedical applications

'Structure units' as material genes in cathode materials for lithium-ion batteries

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National Science Review 2020年第2期7卷 242-245页

作者： Jiaxin Zheng Yaokun Ye Feng Pan school of advanced materials Peking University Shenzhen Graduate School

The basic structure unit of crystals is the lattice atom and its coordination environment. They are arranged periodically in certain combinations (e.***.space group) to form crystals. Generally speaking, the bonding interaction and electronic structure in the structure unit determine the intrinsic physical and chemical properties of crystals [1],similar to the key role of genes in life.

关键词： as material genes in cathode materials for lithium-ion batteries Structure units

界面工程用于提高CoP-Co_(2)P多晶型物在全pH值析氢反应和碱性全解水反应中的电催化性能

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Science China materials 2022年第9期65卷 2433-2444页

作者：陈蕾任金涛袁忠勇 Key Laboratory of advanced Energy materials Chemistry(Ministry of Education) National Institute for Advanced MaterialsSchool of Materials Science and EngineeringNankai UniversityTianjin 300350China

开发具有丰富活性位点和高本征活性的磷化钴催化剂,用于高效且稳定的析氢反应(HER)和析氧反应(OER)具有重要意义.本工作通过精准地控制球形膦酸钴的热还原温度合理地构建了新型的碳包裹的CoP-Co_(2)P多晶型物.独特的多级孔结构和CoP-Co_... 详细信息

开发具有丰富活性位点和高本征活性的磷化钴催化剂,用于高效且稳定的析氢反应(HER)和析氧反应(OER)具有重要意义.本工作通过精准地控制球形膦酸钴的热还原温度合理地构建了新型的碳包裹的CoP-Co_(2)P多晶型物.独特的多级孔结构和CoP-Co_(2)P之间的异质界面不仅提高了活性位点的数量,而且还保证了优异的内在催化活性.所制备的催化剂展现出优异的电催化活性和稳定性(对于全pH值HER(0.5 mol L^(-1) H_(2)SO_(4):81 mV@10 mA cm^(-2);1.0 mol L^(-1) KOH:109 mV@10 mA cm^(-2);1.0 mol L^(-1) PBS:227 mV@10 mA cm^(-2))和碱性OER(1.0 mol L^(-1) KOH:1.53 V@10 mA cm^(-2))).在作为双电极电解槽中全解水反应的双功能电催化剂时,该材料可以在1.60 V的低电压下,1.0 mol L^(-1) KOH电解液中提供10 mA cm^(-2)的电流密度.本文还详细研究了CoP-Co_(2)P多晶型物在催化反应过程中的结构析出.本工作为用于各种电化学技术中的高效且价格合理的金属磷化物的设计和制备提供了一种新的方法.

关键词： cobalt phosphides polymorphs heterointerface hydrogen evolution oxygen evolution

水系可充锌电池中H_(0.642)V_(2)O_(5)·0.143H_(2)O正极的高循环稳定性机制研究

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Science China materials 2022年第1期65卷 78-84页

作者：王乐涛陈传玺任恒宇秦润之易浩聪丁收香李洋姚路李舜宁赵庆贺潘锋 school of advanced materials Peking University Shenzhen Graduate SchoolShenzhen 518055China

水系可充电池中过渡金属氧化物宿主材料的循环稳定性是影响其长时间服役性能的关键.本文通过简单的预嵌入方法,将一定量的质子和水分子预嵌入到V_(2)O_(5)晶格中,重构了晶体结构,获得了高性能水系锌电池中的H_(0.642)V_(2)O_(5)·0.143H... 详细信息

水系可充电池中过渡金属氧化物宿主材料的循环稳定性是影响其长时间服役性能的关键.本文通过简单的预嵌入方法,将一定量的质子和水分子预嵌入到V_(2)O_(5)晶格中,重构了晶体结构,获得了高性能水系锌电池中的H_(0.642)V_(2)O_(5)·0.143H_(2)O(HVO)层状正极材料.得益于该结构重构,钒氧化物正极循环过程中的“层状/非晶”结构演化过程被抑制,由此获得极高循环稳定性(在0.5 A g^(-1)电流密度下循环500圈几乎无衰减).此外,该研究报道了HVO正极中质子和锌离子协同嵌入的储能机制,为下一代高性能钒基正极材料的设计提供了一种新的理念.

关键词：层状正极材料循环稳定性过渡金属氧化物锌电池循环过程钒氧化物结构重构晶体结构

ZnO Additive Boosts Charging Speed and Cycling Stability of Electrolytic Zn–Mn Batteries

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Nano-Micro Letters 2024年第4期16卷 293-304页

作者： Jin Wu Yang Tang Haohang Xu Guandie Ma Jinhong Jiang Changpeng Xian Maowen Xu Shu‑Juan Bao Hao Chen Institute for Clean Energy&advanced materials School of Materials and EnergySouthwest UniversityChongqing 400715People’s Republic of China

Electrolytic aqueous zinc-manganese(Zn–Mn) batteries have the advantage of high discharge voltage and high capacity due to two-electron reactions. However, the pitfall of electrolytic Zn–Mn batteries is the sluggish deposition reaction kinetics of manganese oxide during the charge process and short cycle life. We show that, incorporating ZnO electrolyte additive can form a neutral and highly viscous gel-like electrolyte and render a new form of electrolytic Zn–Mn batteries with significantly improved charging capabilities. Specifically, the ZnO gel-like electrolyte activates the zinc sulfate hydroxide hydrate assisted Mn^(2+) deposition reaction and induces phase and structure change of the deposited manganese oxide(Zn_(2)Mn_(3)O_8·H_(2)O nanorods array), resulting in a significant enhancement of the charge capability and discharge efficiency. The charge capacity increases to 2.5 mAh cm^(-2) after 1 h constant-voltage charging at 2.0 V vs. Zn/Zn^(2+), and the capacity can retain for up to 2000 cycles with negligible attenuation. This research lays the foundation for the advancement of electrolytic Zn–Mn batteries with enhanced charging capability.

关键词： Electrolytic aqueous zinc-manganese batteries Electrolyte pH value ZnO electrolyte additive Fast constant-voltage charging ability