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A porous Co_(3)O_(4)-carbon paper electrode enabling nearly 100% electrocatalytic reduction of nitrate to ammonia

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Materials Reports(Energy) 2023年第3期3卷 41-47页

作者： Xufeng Rao jiaying yan Koji Yokoyama Xiaolin Shao Chihiro Inoue Mei-fang Chien Yuyu Liu Institute for Sustainable Energy/College of Sciences Shanghai UniversityShangda Road 99BaoshanShanghai200444PR China Graduate School of Environmental Studies Tohoku UniversityAoba KuAoba 6-6-20 AramakiSendaiMiyagi9808579Japan

Co_(3)O_(4) was synthesized on carbon paper(CP)using a facile method to improve electrochemical nitrate-toammonia conversion efficiency.The resulting Co_(3)O_(4)-CP electrode demonstrated an exceptional Faradaic efficiency of almost 100% across a broad range of application conditions,with a peak NH3 yield of 3.43 mmol h^(-1) cm^(-2)(2.25 mol gCo^(-1) h^(-1)).

关键词： Nitrate Electroreduction Ammonia Catalyst Co_(3)O_(4)

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一锅法合成可印刷室温磷光二氟化硼衍生物

高等学校化学学报 2024年第1期45卷 18-23页

作者：张兴红耿鹏向娟娟晏佳莹毛妙付肖述章三峡大学材料与化工学院宜昌443002

纯有机室温磷光(RTP)材料因其潜在的应用价值而备受关注.迄今,多数已报道的有机RTP材料在晶态下发射出较强的RTP,但在溶液加工过程中易生成无定形态,从而失去RTP性能.本文通过一锅法两步反应,合成了含有多个甲氧基的二氟化硼衍生物(BF2-... 详细信息

纯有机室温磷光(RTP)材料因其潜在的应用价值而备受关注.迄今,多数已报道的有机RTP材料在晶态下发射出较强的RTP,但在溶液加工过程中易生成无定形态,从而失去RTP性能.本文通过一锅法两步反应,合成了含有多个甲氧基的二氟化硼衍生物(BF2-tPMO).晶体结构分析表明,多个甲氧基的存在构建了有效的分子间非共价相互作用.这些非共价键作用可抑制分子运动,保持较高的发光效率.此外,这些非共价键作用能够使其在溶剂处理后依然保持晶态性质,进而保持RTP性能.实验结果表明,BF2-tPMO可溶解在不同溶剂中且在溶剂蒸发后仍能保持相同的RTP特性,为易加工型RTP材料的设计提供了有效的策略.

关键词：二氟化硼室温磷光一锅法合成分子间相互作用

Introduction to AVS2 Scene Video Coding Techniques

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ZTE Communications 2016年第1期14卷 50-53页

作者： jiaying yan Siwei Dong Yonghong Tian Tiejun Huang National Engineering Laboratory for Video Technology School of EE & CS Peking University School of Electronic and Computer Engineering Shenzhen Graduate School Peking University Cooperative Medianet Innovation Center

The second generation Audio Video Coding Standard (AVS2) is the most recent video coding standard. By introducing several new coding techniques, AVS2 can provide more efficient compression for scene videos such as surveillance videos, conference videos, etc. Due to the limited scenes, scene videos have great redundancy especially in background region. The new scene video coding techniques applied in AVS2 mainly focus on reducing redundancy in order to achieve higher compression. This paper introduces several important AVS2 scene video coding techniques. Experimental results show that with scene video coding tools, AVS2 can save nearly 40%BD?rate (Bj?ntegaard?Delta bit?rate) on scene videos.

关键词： AVS2 scene videos coding background prediction

Boosted sustained-release with iron-based MOF-derived mesoporouscarbon-spheres as a nitroimidazole drugs carrier

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Particuology 2024年第3期86卷 269-280页

作者： Danping Wu jiaying Zou Junyi Chen yan Li Na Ma Wei Dai College of Chemistry and Materials Science Zhejiang Normal UniversityJinhua321004China College of Life Sciences Zhejiang Normal UniversityJinhua321004China College of Geography and Environmental Sciences Zhejiang Normal UniversityJinhua321004China

Metal-organic framework(MoF)with a buildable internal structure has aroused great interest focus as self-sacrificing precursors of porous carbon(PC).However,as a drug carrier,the MOF-derived PC developed thus far are generally composed of irregular powder shape due to their crystalline nature,which consequently causing the cerebral infarction,cerebral thrombosis,and other blood diseases.In this article,we propose a novel approach to constructing amorphous carbon microspheres(AcMs)by dis-torting the topological network through hydrothermal treatment precursors of MIL-101(Fe).Then,a distinctive MIL-101(Fe)-derived spherical porous carbons(MSPC)is achieved through high temperature calcination toward ACMs.Effects of the glucose initial concentration and hydrothermal treatment time on the sphericity of the as-prepared mesoporous MsPC were investigated in depth.And the loading capacities and sustained-release performances of nitroimidazole drugs over MsPC through simulation internal environment of human body at different pH values was systematically evaluated.The nitro-imidazole drugs loading rate and release time of MsPC are 10% and 17 h under preferred process.Furthermore,the MSPC exhibited very low toxicity on Hela cells and 293T cells at the concentrations tested(10-800μg mL^(-1)).This study,therefore,supports the potential of the mesoporous carbon spheres as a carrierfor nitroimidazole drug delivery.

关键词： Ornidazole Metronidazole Carbon spheres Sustained-release performance Biocompatibility

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BN-C异质载体担载Pd的催化氧还原性能

山东理工大学学报（自然科学版） 2024年第4期38卷 61-65页

作者：董兴超宋春葶闫嘉莹李巧灵司维蒙曹超超山东理工大学材料科学与工程学院山东淄博255049 河北工业大学材料科学与工程学院天津300130

氧还原反应(ORR)是质子交换膜燃料电池(PEMFCs)系统重要的阴极反应,研究具有高活性和高稳定性的氧还原催化剂具有重要意义。采用第一性原理计算方法,构建了BN-C异质载体担载Pd金属催化剂理论计算模型,探究了载体对Pd催化氧化还原性能的... 详细信息

氧还原反应(ORR)是质子交换膜燃料电池(PEMFCs)系统重要的阴极反应,研究具有高活性和高稳定性的氧还原催化剂具有重要意义。采用第一性原理计算方法,构建了BN-C异质载体担载Pd金属催化剂理论计算模型,探究了载体对Pd催化氧化还原性能的增强作用,结果表明:相对于BN和碳载体,BN-C异质载体与Pd之间的态密度有着更为明显的轨道杂化,说明二者之间具有强相互作用从而增强催化剂的稳定性;在BN-C的作用下,Pd对O_(2)的吸附及活化得到增强,其吸附能及O—O键长分别为1.064 eV和1.357Å;BN-C进一步促进了O_(2)与Pd之间的电荷转移。由此证明,相对于BN和C载体,BN-C异质结构可进一步增强Pd的催化氧还原性能。

关键词：燃料电池氮化硼载体氧还原反应密度泛函理论

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Step‑by‑Step Modulation of Crystalline Features and Exciton Kinetics for 19.2%Efficiency Ortho‑Xylene Processed Organic Solar Cells

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Nano-Micro Letters 2024年第2期16卷 258-272页

作者： Bosen Zou Weiwei Wu Top Archie Dela Pena Ruijie Ma Yongmin Luo Yulong Hai Xiyun Xie Mingjie Li Zhenghui Luo jiaying Wu Chuluo yang Gang Li He yan Department of Chemistry Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction The Hong Kong University of Science and TechnologyClear Water BayHong KongPeople’s Republic of China Department of Electronic and Information Engineering Research Institute for Smart Energy(RISE)Guangdong‑Hong Kong‑Macao(GHM)Joint Laboratory for Photonic‑Thermal‑Electrical Energy Materials and DevicesThe Hong Kong Polytechnic UniversityHung HomKowloonHong Kong 999077People’s Republic of China The Hong Kong University of Science and Technology Function HubAdvanced Materials ThrustNanshaGuangzhou 511400People’s Republic of China Department of Applied Physics The Hong Kong Polytechnic UniversityHong KongPeople’s Republic of China Shenzhen Key Laboratory of New Information Display and Storage Materials College of Materials Science and EngineeringShenzhen UniversityShenzhen 518060People’s Republic of China

With plenty of popular and effective ternary organic solar cells(OSCs)construction strategies proposed and applied,its power conversion efficiencies(PCEs)have come to a new level of over 19%in single-junction devices.However,previous studies are heavily based in chloroform(CF)leaving behind substantial knowledge deficiencies in understanding the influence of solvent choice when introducing a third component.Herein,we present a case where a newly designed asymmetric small molecular acceptor using fluoro-methoxylated end-group modification strategy,named BTP-BO-3FO with enlarged bandgap,brings different morphological evolution and performance improvement effect on host system PM6:BTP-eC9,processed by CF and ortho-xylene(o-XY).With detailed analyses supported by a series of experiments,the best PCE of 19.24%for green solvent-processed OSCs is found to be a fruit of finely tuned crystalline ordering and general aggregation motif,which furthermore nourishes a favorable charge generation and recombination behavior.Likewise,over 19%PCE can be achieved by replacing spin-coating with blade coating for active layer deposition.This work focuses on understanding the commonly met yet frequently ignored issues when building ternary blends to demonstrate cutting-edge device performance,hence,will be instructive to other ternary OSC works in the future.

关键词： Organic solar cells Ternary design Solvent selection Flouro-methoxylated end group Morphological ordering

Flavonoid extracts from chrysanthemum with appropriate anthocyanins turn blue when exposed to iron ions

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Horticultural Plant Journal 2024年第3期10卷 837-852页

作者： yanfei Li jiaying Wang Chenfei Lu Zhongman Wang Chengyan Deng Kang Gao Jingjing Li Zhijun Fang Hao Liu yan Hong Silan Dai Beijing Key Laboratory of Ornamental Plants Germplasm Innovation&Molecular Breeding National Engineering Research Center for FloricultureBeijingLaboratory of Urban and Rural Ecological EnvironmentKey Laboratory for Genetics and Breeding of Forest Trees and Ornamental Plants of Ministry of EducationSchool of Landscape ArchitectureBeijing Forestry UniversityBeijing 100083China Beijing Greenland Maintenance and Management Service Center Beijing 102211China Beijing North Asia Landscape Co. Beijing 102211China

Although some species that accumulate only cyanidin(Cy)in nature can produce blue flowers through iron ions,there has been no evidence of blue chrysanthemums being generated in this manner.This study revealed that flavonoid extracts from the ray florets of the chrysanthemum cultivar‘Wandai Fengguang’turned blue when exposed to Fe^(3+).Samples that could turn blue were labeled as CB(Cy-determined blue flowers),while samples that did not turn blue were labeled as CN(Cy-determined non-blue flowers).After a series of experiments,a stable screening system was established using flavonoid extracts containing NaAc buffer at pH 5.5 and a total anthocyanin concentration(TAC)of 30 μmol·L^(-1),and the addition of Fe^(3+)from 0 to 0.25 μmol·L^(-1)allowed for the selection of five CB samples from 39 chrysanthemum cultivars.All five CB samples exhibited flower color phenotypes that belonged to Cluster-I with redness(a*)values ranging from 29.03 to 45.99,yellowness(b*)values from-11.31 to 3.77,and brightness(L*)values from 29.07 to 45.99.Additionally,the ratio of TAC to total luteolin concentration(TLC)was found to be a critical factor for distinguishing between CB and CN samples.To realize the desired blue hue in the flavonoid extracts with the participation of Fe^(3+),a TAC to TLC ratio of 2.25 and above is required.Moreover,the protoplasts and ray florets of CB samples that turned blue with the involvement of Fe^(2+)showed great potential for cultivating blue chrysanthemums through ferric-anthocyanin chelate.Overall,this study reveals that blue flowers can be cultivated through the increase in the iron ion concentration,combined with the accumulation of Cy.

关键词： Chrysanthemum×morifolium Cyanidin Copigment Ferric-anthocyanin chelate Blue flower

Tetraphenylene-chalcone hybrid derivatives: synthesis, structural, multi-state emission and imaging in living cells

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Tetraphenylene-chalcone hybrid derivatives: synthesis, struc...

计及锁相误差的双馈风电并网系统暂态过电压特性与抑制

中国化学会第二届全国光功能材料青年学者研讨会

作者： Hui Chen Shirong Fang Lihong Wang Xiang Liu jiaying yan Nuonuo Zhang 郑开波 College of Materials and Chemical Engineering China Three Gorges University Hubei Provincial Key Laboratory of Occurrence and Intervention of Rheumatic Diseases Respiratory department Minda Hospital of Hubei Minzu University

Tetraphenylene-chalcones hybrid derivatives（TPE-T, TPE-B, TPE-N and TPE-Q） have been designed and synthesized, and their optical properties have also been investigated. These new organic fluorophores exhibited relatively large Stokes shifts and absorption extinction coefficients, solvation effects, and some of them also showed moderate AIE effects and solid fluorescence. More significantly, TPE-N shows good multi-state fluorescence emission（solution, solid and aggregation states）. Single-crystal analysis indicates that molecular stacking patterns are the critical reason affecting the optical properties in solid state. Theoretical calculation explain the fluorescence behaviors because of ICT processes. It has been further demonstrated that these organic fluorophores can be employed for imaging in living cells.

关键词： Tetraphenylene-chalcone hybrid derivatives multi-state emission imaging solvation effects

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电力系统自动化 2023年第11期47卷 165-173页

作者：刘其辉闫佳颖吴勇吴林林新能源电力系统国家重点实验室(华北电力大学) 北京市102206 国网冀北电力有限公司电力科学研究院北京市100045

风电并网系统交流短路时,锁相环(PLL)锁相误差导致风机功率耦合,在故障清除时产生暂态过电压,亟须开展计及锁相误差的暂态过电压机理、特性与抑制策略的研究。首先,分析PLL参数、故障位置及故障类型对暂态过电压的影响。然后,以三相故... 详细信息

风电并网系统交流短路时,锁相环(PLL)锁相误差导致风机功率耦合,在故障清除时产生暂态过电压,亟须开展计及锁相误差的暂态过电压机理、特性与抑制策略的研究。首先,分析PLL参数、故障位置及故障类型对暂态过电压的影响。然后,以三相故障为例揭示了相位跳变的特征及锁相误差引起暂态过电压的机理,提出基于改进型PLL结构与锁相误差补偿的转子侧变流器、定子侧变流器控制策略,实现对双馈风电机组(DFIG)暂态过电压的主动抑制。最后,仿真验证了所提策略在实现DFIG故障穿越的同时还能够进一步抑制暂态过电压。

关键词：风电并网系统相位跳变锁相环暂态过电压抑制策略