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Efficient electrooxidation of biomass-derived aldehydes over ultrathin Ni V-layered double hydroxides films

Journal of Energy Chemistry 2023年第3期78卷 412-421,I0012页

作者： Biying Liu Zhikeng Zheng Yaoyu Liu Man Zhang Yuchen wang yangyang wan Kai Yan Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology School of Environmental Science and EngineeringSun Yat-sen UniversityGuangzhou 510275GuangdongChina Guangdong Laboratory for Lingnan Modern Agriculture South China Agricultural UniversityGuangzhou 510642GuangdongChina Institute for Advanced Materials School of Materials Science and EngineeringJiangsu UniversityZhenjiang 212013JiangsuChina

Selective upgrading of C=O bonds to afford carboxylic acid is significant for the petrochemical industry and biomass *** we declared the efficient electrooxidation of biomass-derived aldehydes family over NiV-layered double hydroxides(LDHs) thin *** studies confirmed the hydroxyl active intermediate(-OH*) generated on the surface of NiV-LDHs films by employing electrochemical impedance spectroscopy and the electron paramagnetic resonance *** using advanced techniques,e.g.,extended X-ray absorption fine structure and high-angle annular dark-field scanning transmission electron microscopy,NiV-LDHs films with 2.6 nm could expose larger specific surface *** benzaldehyde as a model,high current density of 200 mA cm^(-2)at 1.8 V ***,81.1% conversion,77.6% yield of benzoic acid and 90.8% Faradaic efficiency were reached,which was superior to most of previous *** DFT analysis was well matched with experimental findings and documented that NiV-LDHs had high adsorption capacity for the aldehydes to suppress the side reaction,and the aldehydes were oxidized by the electrophilic hydroxyl radicals formed on *** findings offer a universal strategy for the robust upgrading of diverse biomass-derived platform chemicals.

关键词： NiV-LDHs Films Hydroxyl radicals Electrocatalytic oxidation Biomass-derived aldehydes

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Data driven discovery of conjugated polyelectrolytes for optoelectronic and photocatalytic applications

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npj Computational Materials 2021年第1期7卷 641-649页

作者： yangyang wan Fernando Ramirez Xu Zhang Thuc-Quyen Nguyen Guillermo C.Bazan Gang Lu Department of Physics and Astronomy California State University NorthridgeNorthridgeCaliforniaUSA Department of Chemistry and Biochemistry University of CaliforniaSanta BarbaraCaliforniaUSA

Conjugated polyelectrolytes(CPEs),comprised of conjugated backbones and pendant ionic functionalities,are versatile organic materials with diverse ***,the myriad of possible molecular structures of CPEs render traditional,trial-and-error materials discovery strategy ***,we tackle this problem using a data-centric approach by incorporating machine learning with high-throughput first-principles *** systematically examine how key materials properties depend on individual structural components of CPEs and from which the structure–property relationships are *** means of machine learning,we uncover structural features crucial to the CPE properties,and these features are then used as descriptors in the machine learning to predict the properties of unknown ***,we discover promising CPEs as hole transport materials in halide perovskite-based optoelectronic devices and as photocatalysts for water *** work could accelerate the discovery of CPEs for optoelectronic and photocatalytic applications.

关键词： conjugated backbone photocatalytic

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Review on Speckle-Based Spectrum Analyzer

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Photonic Sensors 2021年第2期11卷 187-202页

作者： yangyang wan Xinyu FAN Zuyuan HE State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong UniversityShanghai 200240China

Accurate spectral measurement and wavelength determination are fundamental and vital for many fields.A compact spectrum analyzer with high performance is expected to meet the growing requirements,and speckle-based spectrum analyzer is a potential *** basic principle is based on using the random medium to establish a speckle-to-wavelength mapping relationship for spectrum *** article introduces current speckle-based spectrum analyzers with different schemes and reviews recent advances in this ***,some applications by using speckle-based spectrum analyzers are also ***,the existing challenges and the future prospects of using speckle for spectrum recovery are discussed.

关键词： Speckle spectrum analyzer random medium spectroscopy

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Whispering-gallery-mode barcode-based broadband sub-femtometer-resolution spectroscopy with an electro-optic frequency comb

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Advanced Photonics 2024年第1期6卷 115-125页

作者： Bingxin Xu yangyang wan Xinyu Fan Zuyuan He Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and NetworksDepartment of Electronic EngineeringShanghaiChina Max-Planck Institute of Quantum Optics Hans-Kopfermann-Straûe 185748 GarchingGermany

Spectroscopy is the basic tool for studying molecular physics and realizing biochemical ***,it is challenging to realize sub-femtometer resolution spectroscopy over broad *** and high-resolution spectroscopy with calibrated optical frequency is demonstrated by bridging the fields of speckle pattern and electro-optic frequency comb.A wavemeter based on a whispering-gallery-mode barcode is proposed to link the frequencies of a probe continuous-wave laser and an ultrastable *** ultrafine electro-optic comb lines are generated from the probe laser to record spectrum of sample with sub-femtometer *** bandwidth is a thousandfold broader than comb bandwidth,by sequentially tuning the probe laser while its wavelength is *** approach fully exploits the advantages of two fields to realize 0.8-fm resolution with a fiber laser and 80-nm bandwidth with an external cavity diode *** spectroscopic measurements of an ultrahigh Q-factor cavity and gas molecular absorption are experimentally *** compact system,predominantly constituted by few-gigahertz electronics and telecommunication components,shows enormous potential for practical spectroscopic applications.

关键词： frequency comb reconstructive wavemeter spectroscopy

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Surface etching induced ultrathin sandwich structure realizing enhanced photocatalytic activity

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Science China Chemistry 2018年第12期61卷 1572-1580页

作者： Bo Yang Wentuan Bi yangyang wan Xiaogang Li Mingcan Huang Ruilin Yuan Huanxin Ju wangsheng Chu Xiaojun Wu Linghui He Changzheng Wu Yi Xie National Laboratory for Physical Sciences at the Microscale Collaborative Innovation Cenof Chemistry for Energy Materials (iChEM) CAS Key Laboratory of Mechanical Behavior and Design of Materials (LMBD) and Department of Modern Mechanics University of Science & Technology of China Hefei 230026 China CAS Key Laboratory of Materials for Energy Conversion CAS Center for Excellence in Nanoscience Synergetic Innovation of Quantum Information & Quantum Technology and Department of Materials Science and Engineering University of Science &Technology of China Hefei 230026 China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230026 China

Photocatalytic conversion efficiency is limited by serious charge carrier recombination. Efficient carrier separation is usually achieved by elegantly-designed multi-component structures connected by directional electric field. Herein, we developed a twodimensional(2 D) sandwich structure, as a new photocatalytic system, to realize high-efficiency carrier separation. This strategy integrated multifunction into a single structure for the first time, which successfully introduces a stable built-in electric field,realizing high-effective carrier separation. Besides, the carrier concentration is dramatically increased due to dimensional confinement. Benefiting from above synergic advantages, 2 D sandwich photocatalyst achieves the highest nitrogen fixation rate(435 μmol g^(-1) h^(-1)) in inorganic solid photocatalysts under visible light irradiation. We anticipate that 2 D sandwich photocatalyst holds promises for the application and expansion of 2 D materials in photocatalysis research.

关键词： two-dimensional materials photocatalysis sandwich structure surface modification nitrogen fixation

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High-metallic-phase-concentration MO1-xWxS2 nanosheets with expanded interlayers as efficient electrocatalysts

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Nano Research 2018年第3期11卷 1687-1698页

作者： Qun He yangyang wan Hongliang Jiang Chuanqiang Wu Zhongti Sun Shuangming Chen Yu Zhou Haiping Chen Daobin Liu Yasir A. Haleem Binghui Ge Xiaojun Wu Li Song National Synchrotron Radiation Laboratory CAS Center for Excellence in Nanoscience University of Science and Technology of China Hefei 230029 China CAS Key Lab of Materials for Energy Conversion CAS Center for Excellence in Nanoscience Hefei National Laboratory for Physical Science at the Microscale Synergetic Innovation of Quantum Information & Quantum Technology University of Science and Technology of China Hefei 230026 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

In most cases, layered transition metal dichalcogenides （LTMDs）, containing metallic phases, show electrochemical behavior different from their semiconductor counterparts. Typically, two-dimensional layered metallic 1T-MoS2 demonstrates better electrocatalytic performance for water splitting compared to its 2H counterpart. However, the characteristics of low metallic phase concentration and poor stability limit its applications in some cases. Herein, we demonstrate a simple and efficient bottom-up wet-chemistry strategy for the large-scale synthesis of nanoscopic ultrathin Mo1-xWxS2 nanosheets with enlarged interlayer spacing and high metallic phase concentration. Our characterizations, including X-ray absorption fine structure spectroscopy （XAFS）, high-angle annular dark-field- scanning transmission electron microscopy （HAADF-STEM）, and X-ray photoelectron spectroscopy （XPS） revealed that the metallic ultrathin ternary Mo1-xWxS2 nanosheets exhibited distorted metal-metal bonds and a tunable metallic phase concentration. As a proof of concept, this optimized catalyst, with the highest metallic phase concentration （greater than 90%）, achieved a low overpotential of about -155 mV at a current density of -10 ma/cm^2, a small Tafel slope of 67 mV/dec, and an increased turnover frequency （TOF） of 1.3 H2 per second at an overpotential of -300 mV （vs. reversible hydrogen electrode （RHE））, highlighting the importance of the metallic phase. More importantly, this study can lead to a facile solvothermal route to prepare stable and high-metallic- phase-concentration transition-metal-based two-dimensional materials for future applications.

关键词： wet-chemistr gram-scale synthesis interlayer intercalation metallic transition metaldichalcogenide electrocatalytic water splitting

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TavWA1 is critical for wheat growth by modulating cell morphology and arrangement

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Journal of Integrative Plant Biology 2025年第1期67卷 71-86页

作者： Guowei Chang Yue Li Lei Peng Chuncai Shen Yipeng Lu wan Teng yangyang Liu Yingchun wang Weiqi Zhu Cuimin Liu Xue He Yiping Tong Xueqiang Zhao Key Laboratory of Seed Innovation Institute of Genetics and Developmental BiologyThe Innovative Academy of Seed DesignChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Plant Molecular Physiology Institute of BotanyChinese Academy of SciencesBeijing 100093China State Key Laboratory of Molecular Developmental Biology Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China Zhaoxian Experiment Station Shijiazhuang Academy of Agricultural and Forestry SciencesZhaoxian 515300China

Plant growth is determined by the production of cells and initiation of new *** genes that control cell number and cell size is of great significance for understanding plant growth *** this study,we characterized two wheat mutants,ah and dl,with abnormal *** ah mutant is a naturally occurring variant characterized by severe dwarfism,increased tiller number,and reduced grain length,while the dl mutant is derived from an ethyl methane sulfonate(EMS)-mutagenized population and exhibits smaller grain size and slightly reduced plant *** analyses revealed abnormal cell number,cell morphology and arrangement in the stems and leaves of the ah mutant,along with reduced cell length in the grains of the dl ***-based cloning identified that both mutants carry mutations in the same gene TavWA1-7D,which encodes a protein with a von Willebrand factor A(vWA)*** ah mutant harbors a 174-bp insertion in the 1,402-bp coding sequence(CDS)of TavWA1-7D,causing premature termination of protein translation,while the dl mutant contains a Glu420Lys *** the TavWA1-7D ahthrough clustered regularly interspaced short palindromic repeats(CRISPR)/CRISPR-associated nuclease 9-mediated genome editing leads to a severe dwarfism *** C-terminus of the protein is crucial for its correct subcellular localization and interaction,supporting its critical role for TavWA1-7D *** analysis showed that the dwarf phenotype of the ah mutant is associated with impaired photosynthesis,ribosome function,and nucleosome ***,TavWA1-7D interacts with an E3 ligase,Ta VIP1-3B,the expression levels of which are elevated in both *** and knockout studies of TaVIP1-3B demonstrated its negative regulatory role in cell length and grain ***,our findings suggest that TavWA1-7D plays a vital role in regulating wheat growth and yield-related traits,with the dl mutant's short grain phen

关键词： grain size severe dwarf TaVIP1 TavWA1 wheat

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以文化人:文化建设何以推进社区治理能力的现代化转型--基于杭州市下城区武林街道的实践分析

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学习论坛 2021年第2期37卷 88-95页

作者：赵定东万鸯鸯杭州师范大学公共管理学院浙江杭州311121 复旦大学社会发展与公共政策学院上海200433

文化治理是国家治理的文化路向,社区文化治理是国家治理的韧性基础。在探索当前我国社区文化治理产生的基础性条件上,武林街道社区文化治理通过营造志愿文化、建设非遗文化.和创新社区服务文化等行动举措,开启了城市社区治理的现代化转... 详细信息

文化治理是国家治理的文化路向,社区文化治理是国家治理的韧性基础。在探索当前我国社区文化治理产生的基础性条件上,武林街道社区文化治理通过营造志愿文化、建设非遗文化.和创新社区服务文化等行动举措,开启了城市社区治理的现代化转型探索,为基层治理有效拓宽了社会支持、地域社会为治理有为提供了实体场所、居民获得感为治理有位夯实了内在支撑。然而,由于受到条块分割的城市行政体制、较弱的居民主体参与、相对落后的文化治理方式及治理机制等因素的制约,社区文化治理效应受到影响。研究发现,切实增强合作共治的程度、全面激发文化的治理功能、着力提高监督管理的精准化、同步转变和更新治理理念是社区文化未来治理的改进方向。

关键词：文化建设社区治理杭州市武林街道

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计算重构光谱分析仪研究进展

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应用科学学报 2021年第5期39卷 695-712页

作者：万阳阳樊昕昱何祖源上海交通大学区域光纤通信网与新型光通信系统国家重点实验室上海200240

光谱测量广泛应用于科学研究及工业生产中,而传统光谱仪因体积庞大难以满足众多应用需求。近年来,快速发展的计算重构光谱分析仪因其具有紧凑小巧、高分辨率和大测量带宽等优势而成为研究热点。光波经过计算重构光谱分析仪后所产生的光... 详细信息

光谱测量广泛应用于科学研究及工业生产中,而传统光谱仪因体积庞大难以满足众多应用需求。近年来,快速发展的计算重构光谱分析仪因其具有紧凑小巧、高分辨率和大测量带宽等优势而成为研究热点。光波经过计算重构光谱分析仪后所产生的光斑图案与波长存在一一对应关系,因此采取合适的解调算法可以从生成的光斑图案中重构入射光谱信息。目前计算重构光谱仪已能实现am量级光谱分辨率以及数百nm的测量带宽。本综述介绍了目前各类型计算重构光谱分析仪的工作原理以及性能指标,探讨了不同类型计算重构光谱分析仪的优缺点,分析了进一步提升性能指标的方法,展示了一些基于计算重构光谱分析仪的应用,以及展望了其未来发展前景。

关键词：光谱学光斑光谱仪高分辨率

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Global Dynamics of a Kawasaki Disease Vascular Endothelial Cell Injury Model with Backward Bifurcation and Hopf Bifurcation

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Acta Mathematicae Applicatae Sinica 2025年第1期41卷 200-233页

作者： Ke GUO wan-biao MA School of Mathematics and Physics University of Science and Technology BeijingBeijing 100083China

Kawasaki disease(KD)is an acute,febrile,systemic vasculitis that mainly affects children under five years of *** this paper,we propose and study a class of 5-dimensional ordinary differential equation model describing the vascular endothelial cell injury in the lesion area of *** model exhibits forward/backward *** is shown that the vascular injury-free equilibrium is locally asymptotically stable if the basic reproduction number R_(0)1,and some explicit analytic expressions of ultimate lower bounds of the solutions of the model are *** results suggest that the control of vascular injury in the lesion area of KD is not only correlated with the basic reproduction number R_(0),but also with the growth rate of normal vascular endothelial cells promoted by the vascular endothelial growth factor.

关键词： Kawasaki disease model backward bifurcation Hopf bifurcation global stability permanence

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