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Boost the Utilization of Dense FeN_(4) Sites for High-Performance Proton Exchange Membrane Fuel Cells

Energy & Environmental Materials 2024年第3期7卷 398-405页

作者： Yanrong Li Shuhu Yin Long Chen xiaoyang Cheng Chongtai w.ng Yanxia Jiang Shigang Sun State Key Laboratory of Physical Chemistry of Solid Surfaces Engineering Research Center of Electrochemical Technologies of Ministry of EducationCollege of Chemistry and Chemical Engineering and Discipline of Intelligent Instrument and EquipmentXiamen UniversityXiamen 361005China College of Chemistry and Chemical Engineering Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan ProvinceHainan Normal UniversityHaikou 571158China

Iron-nitrogen-carbon(Fe-N-C)catalysts for the oxygen reduction reaction(ORR)in proton exchange membrane fuel cells(PEMFCs)have seriously been hindered by their poor ORR performance of Fe-N-C due to the low active site density(SD)and site ***,we reported a melamine-assisted vapor deposition approach to overcome these *** melamine not only compensates for the loss of nitrogen caused by high-temperature pyrolysis but also effectively etches the carbon substrate,increasing the external surface area and mesoporous porosity of the carbon *** can provide more useful area for subsequent vapor deposition on active *** prepared 0.20Mela-FeNC catalyst shows a fourfold higher SD value and site utilization than the FeNC without the treatment of *** a result,0.20Mela-FeNC catalyst exhibits a high ORR activity with a half-wave potential(E_(1/2))of 0.861 V and 12-fold higher ORR mass activity than the FeNC in acidic *** the cathode in a H_(2)-O_(2)PEMFCs,0.20Mela-FeNC catalyst demonstrates a high peak power density of 1.30 w cm^(-2),outstripping most of the reported Fe-N-C *** developed melamine-assisted vapor deposition approach for boosting the SD and utilization of Fe-N-C catalysts offers a new insight into high-performance ORR electrocatalysts.

关键词： fuel cells melamine oxygen reduction reaction site density utilization

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All‑Covalent Organic Framework Nanofilms Assembled Lithium‑Ion Capacitor to Solve the Imbalanced Charge Storage Kinetics

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Nano-Micro Letters 2024年第6期16卷 246-260页

作者： xiaoyang Xu Jia Zhang Zihao Zhang Guandan Lu wei Cao Ning w.ng Yunmeng Xia Qingliang Feng Shanlin Qiao College of Chemistry and Pharmaceutical Engineering Hebei University of Science and TechnologyShijiazhuang 050018People’s Republic of China School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi’an 710072People’s Republic of China Hebei Engineering Research Center of Organic Solid Photoelectric Materials for Electronic Information Shijiazhuang 050018People’s Republic of China

Free-standing covalent organic framework(COFs)nanofilms exhibit a remarkable ability to rapidly intercalate/de-intercalate Li^(+) in lithium-ion batteries,while simultaneously exposing affluent active sites in *** development of these nanofilms offers a promising solution to address the persistent challenge of imbalanced charge storage kinetics between battery-type anode and capacitor-type cathode in lithium-ion capacitors(LICs).Herein,for the first time,custom-made COFBTMB-TP and COFTAPB-BPY nanofilms are synthesized as the anode and cathode,respectively,for an all-COF nanofilm-structured *** COFBTMB-TP nanofilm with strong electronegative–CF3 groups enables tuning the partial electron cloud density for Li^(+) migration to ensure the rapid anode kinetic *** thickness-regulated cathodic COFTAPB-BPY nanofilm can fit the anodic COF nanofilm in the *** to the aligned 1D channel,2D aromatic skeleton and accessible active sites of COF nanofilms,the whole COFTAPB-BPY//COFBTMB-TP LIC demonstrates a high energy density of 318 mwh cm^(−3) at a high-power density of 6 w cm^(−3),excellent rate capability,good cycle stability with the capacity retention rate of 77%after *** COFTAPB-BPY//COFBTMB-TP LIC represents a new benchmark for currently reported film-type LICs and even film-type *** being comprehensively explored via ex situ XPS,7Li solid-state NMR analyses,and DFT calculation,it is found that the COFBTMB-TP nanofilm facilitates the reversible conversion of semi-ionic to ionic C–F bonds during lithium ***-TP exhibits a strong interaction with Li^(+) due to the C–F,C=O,and C–N bonds,facilitating Li^(+) desolation and absorption from the *** work addresses the challenge of imbalanced charge storage kinetics and capacity between the anode and cathode and also pave the way for future miniaturized and wearable LIC devices.

关键词： Covalent organic frameworks Lithium-ion capacitor Charge storage kinetic

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The CropGPT project:Call for a global,coordinated effort in precision design breeding driven by Al using biological big data

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Molecular Plant 2024年第2期17卷 215-218页

作者： wanchao Zhu Rui Han xiaoyang Shang Tao Zhou Chengyong Liang Xiaomeng Qin Hong Chen Zaiwen Feng Hongwei Zhang Xingming Fan weifu Li Lin Li National Key Laboratory of Crop Genetic Improvement Huazhong Agricultural UniversityWuhan 430070China Key Laboratory of Biology and Genetic Improvement of Maize in Arid Area of Northwest Region College of AgronomyNorthwest A&F UniversityYanglingShaanxi712100China College of Informatics Huazhong Agricultural UniversityWuhan 430070China State Key Laboratory of Crop Gene Resources and Breeding Institute of Crop ScienceChinese Academy of Agricultural SciencesBeijing 100081China institute of Food Crops Sciences Yunnan Academy of Agricultural Sciences2238 Beijing RoadKunmingYunnan 650200China Hubei Hongshan Laboratory Wuhan 430070China Shenzhen Institute of Nutrition and Health Huazhong Agricultural UniversityWuhan 430070China Shenzhen Branch Guangdong Laboratory for Lingnan Modern AgricultureGenome Analysis Laboratory of the Ministry of AgricultureAgricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhen 518120China

Since the beginning of humanity,people have been seeking practical solutions to meet their most basic need:*** advent of agriculture greatly increased the food supply and led to a rapid increase in the human *** food production via agriculture can be attributed to both improved crop management practices and crop breeding through ***(crop)breeding has been categorized into four major stages based on the techniques employed(wallace et al.,2018).

关键词： breeding seeking wallace

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Two-dimensional atomically thin Pt layers on MXenes: The role of electronic effects during catalytic dehydrogenation of ethane and propane

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Nano Research 2024年第3期17卷 1251-1258页

作者： Zhe Li Tobias K.Misicko Fan Yang Xiaopeng Liu Zhenwei wu xiaoyang Gao Tao Ma Jeffrey T.Miller Daniela S.Mainardi Collin D.wick Zhenhua Zeng Yang Xiao Yue wu Department of Chemical and Biological Engineering Iowa State University618 Bissell RoadAmesIA 50011USA Institute for Micromanufacturing Louisiana Tech University505 Tech DriveRustonLA 71272USA Davidson School of Chemical Engineering Purdue University480 Stadium Mall DriveWest LafayetteIN 47907USA Michigan Center for Materials Characterization University of Michigan2800 Plymouth RdAnn Arbor MI 48109USA College of Engineering and Science Louisiana Tech UniversityRustonLA 71272USA

Atomically thin Pt nanolayers were synthesized on the surface of Mo2TiC2 MXenes and used for the catalytic dehydrogenation of ethane and propane into ethylene and propylene,two important chemicals for the petrochemical *** compared with Pt nanoparticles,the atomically thin Pt nanolayer catalyst showed superior coke-resistance(no deactivation for 24 h),high activity(turnover frequencies(TOFs)of 0.4–1.2 s^(-1)),and selectivity(>95%)toward ethylene and *** unique Pt nanolayer has a similar geometric surface to Pt nanoparticles,enabling the investigations of the electronic effect on the catalytic performance,where the geometric effect is *** is found that the electronic effect plays a critical role in dehydrogenative product selectivity and catalyst *** metal–support interaction is found dependent on the substrate and metal components,providing wide opportunities to explore high-performance MXene-supported metallic catalysts.

关键词： MXene catalysis alkane dehydrogenation nanolayers

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激光熔覆修复2A50-T6航空铝合金的组织与力学性能研究

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中国激光 2024年第16期51卷 78-89页

作者：王箫扬童照鹏任旭东江苏大学机械工程学院江苏镇江212013

采用激光熔覆技术对2A50-T6航空铝合金进行了损伤修复,探究了激光工艺参数对显微组织和力学性能的影响规律,重点分析了修复区域气孔等冶金缺陷的形成及其对抗拉强度的影响机制。结果表明,熔覆层中的气孔主要由溶解气体形成的冶金气孔和... 详细信息

采用激光熔覆技术对2A50-T6航空铝合金进行了损伤修复,探究了激光工艺参数对显微组织和力学性能的影响规律,重点分析了修复区域气孔等冶金缺陷的形成及其对抗拉强度的影响机制。结果表明,熔覆层中的气孔主要由溶解气体形成的冶金气孔和金属蒸气喷射引发的工艺气孔组成。激光工艺参数是影响致密度的主要因素,最佳工艺参数为2000 w激光功率、12 mm/s扫描速度、0.8 g/min送粉速度和1.6 mm光斑直径。熔覆层主要由α-Al与Al-Si共晶构成,包含少量的Mg2Si增强相。熔覆层仅有极少量的气孔,致密性达99.96%。激光熔覆修复铝合金的抗拉强度达到基体的93.18%。

关键词： 2A50-T6铝合金激光熔覆修复显微组织气孔缺陷力学性能

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超声对豌豆蛋白-高酯果胶复合颗粒理化和结构特性的影响

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中国食品学报 2024年第2期24卷 130-139页

作者：马开元孙晓洋陈复生张丽芬河南工业大学粮油食品学院郑州450001 河南牧业经济学院、食品与生物工程学院郑州450046

采用超声制备豌豆蛋白-高酯果胶(PP-HMP)复合颗粒,研究超声作用下PP-HMP复合颗粒理化特性的变化规律,同时采用傅里叶红外光谱(FTIR)、内源荧光光谱和透射电子显微镜(TEM)对复合颗粒结构进行表征。结果表明,超声条件为10 min、5.43 w/cm^... 详细信息

采用超声制备豌豆蛋白-高酯果胶(PP-HMP)复合颗粒,研究超声作用下PP-HMP复合颗粒理化特性的变化规律,同时采用傅里叶红外光谱(FTIR)、内源荧光光谱和透射电子显微镜(TEM)对复合颗粒结构进行表征。结果表明,超声条件为10 min、5.43 w/cm^(3)、15℃时,超声制备豌豆蛋白-高酯果胶(PP-HMP-US)复合颗粒的乳化活性和稳定性较高;与PP-HMP相比,PP-HMP-US浊度显著降低(P<0.05),粒径以及多分散性指数(PDI)分别从1453.26 nm和0.34降低到541.44 nm和0.27。FTIR和内源荧光光谱分析结果显示,加入HMP后,PP-HMP复合颗粒的β-转角和α-螺旋相对含量从13.67%和19.89%分别增加至33.85%和26.61%,HMP的添加可抑制PP的聚集,使其形成更紧密的三级构象;适当的超声处理可使PP的β-折叠展开形成α-螺旋,促进其与HMP分子的结合,降低色氨酸残基的暴露程度。TEM结果表明,超声可使HMP嵌入PP球状结构中,获得形态更加规则有序的PP-HMP-US复合颗粒。研究结果为豌豆蛋白在食品加工中的应用提供理论参考。

关键词：豌豆蛋白高酯果胶超声理化特性结构特性

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Targeting of elevated cell surface phosphatidylserine with saposin C-dioleoylphosphatidylserine nanodrug as individual or combination therapy for pancreatic cancer

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world Journal of Gastrointestinal Oncology 2021年第6期13卷 550-559页

作者： Harold w Davis Ahmet Kaynak Subrahmanya D Vallabhapurapu xiaoyang Qi Division of Hematology/Oncology Department of Internal MedicineUniversity of Cincinnati College of MedicineBrain Tumor Center at UC Neuroscience InstituteCincinnatiOH 45267United States Department of Biomedical Engineering College of Engineering and Applied ScienceUniversity of CincinnatiCincinnatiOH 45221United States

Pancreatic cancer is one of the deadliest of cancers with a five-year survival of roughly 8%.Current therapies are:surgery,radiation and *** is curative only if the cancer is caught very early,which is rare,and the latter two modalities are only marginally effective and have significant side *** have developed a nanosome comprised of the lysosomal protein,saposin C(SapC)and the acidic phospholipid,dioleoylphosphatidylserine(DOPS).In the acidic tumor microenvironment,this molecule,SapC-DOPS,targets the phosphatidylserine cancer-biomarker which is predominantly elevated on the surface of cancer ***,SapC-DOPS can selectively target pancreatic tumors and ***,SapC-DOPS has exhibited an impressive safety profile with only a few minor side effects in both preclinical experiments and in phase I clinical *** the dismal outcomes for pancreatic cancer there is an urgent need for better treatments and SapC-DOPS is a good candidate for addition to the oncologist’s toolbox.

关键词： Pancreatic cancer Saposin C Dioleoylphosphatidylserine Phosphatidylserine-targeted therapy Chemotherapy Radiation

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Testing three pipelines for 18S rDNA-based metabarcoding of soil faunal diversity

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Science China(Life Sciences) 2013年第1期56卷 73-81页

作者： YAng ChenXue JI YingQiu w.ng xiaoyang YAng ChunYang YU Douglas w. Ecology Conservationand Environment CenterState Key Laboratory of Genetic Resources and EvolutionKunming Institute of ZoologyChinese Academy of Sciences School of Biological Sciences University of East Anglia

A number of basic and applied questions in ecology and environmental management require the characterization of soil and leaf litter faunal diversity. Recent advances in high-throughput sequencing of barcode-gene amplicons ('metabarcoding') have made it possible to survey biodiversity in a robust and efficient way. However, one obstacle to the widespread adoption of this technique is the need to choose amongst many candidates for bioinformatic processing of the raw sequencing data. we compare three candidate pipelines for the processing of 18S small subunit rDNA metabarcode data from solid substrates: (i) USEARCH/CROP, (ii) Denoiser/UCLUST, and (iii) OCTUPUS. The three pipelines produced reassuringly similar and highly correlated assessments of community composition that are dominated by taxa known to characterize the sampled environments. However, OCTUPUS appears to inflate phylogenetic diversity, because of higher sequence noise. we therefore recommend either the USEARCH/CROP or Denoiser/UCLUST pipelines, both of which can be run within the QIIME (Quantitative Insights Into Microbial Ecology) environment.

关键词： 454 Genome Sequencer FLX System DNA barcoding high-throughput sequencing soil fauna metabarcoding 18SrDNA

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A Robust Segmented Mixed Effect Regression Model for Baseline Electricity Consumption Forecasting

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Journal of Modern Power Systems and Clean Energy 2022年第1期10卷 71-80页

作者： xiaoyang Zhou Yuanqi Gao weixin Yao Nanpeng Yu Department of Statistics University of CaliforniaRiversideCAUSA Department of Electrical and Computer Engineering University of CaliforniaRiversideUSA

Renewable energy production has been surging around the world in recent *** mitigate the increasing uncertainty and intermittency of the renewable generation,proactive demand response algorithms and programs are proposed and developed to further improve the utilization of load flexibility and increase the efficiency of power system *** of the biggest challenges to efficient control and operation of demand response resources is how to forecast the baseline electricity consumption and estimate the load impact from demand response resources *** this paper,we propose a mixed effect segmented regression model and a new robust estimate for forecasting the baseline electricity consumption in Southern California,USA,by combining the ideas of random effect regression model,segmented regression model,and the least trimmed squares *** the log-likelihood of the considered model is not differentiable at breakpoints,we propose a new backfitting algorithm to estimate the unknown *** estimation performance of the new estimation procedure has been demonstrated with both simulation studies and the real data application for the electric load baseline forecasting in Southern California.

关键词： Segmented regression model mixed effects trimmed maximum likelihood demand response electric load

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石墨烯-MnBi_(2)Te_(4)异质结室温高灵敏度太赫兹探测器

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红外与激光工程 2024年第7期53卷 226-233页

作者：胡臻智刘肇国周桓立杨宗儒宋元军张晓阳张彤东南大学仪器科学与工程学院微惯性仪表与先进导航技术教育部重点实验室江苏南京210096 东南大学电子科学与工程学院信息显示与可视化国际合作实验室江苏南京210096 东南大学苏州校区金属纳米光电技术苏州重点实验室江苏苏州215123

太赫兹技术因其在医学成像、深空探索、无线通信、无损检测等领域的应用前景而受到广泛关注。然而,常温条件下对太赫兹辐射进行高灵敏度检测仍然是一个极大的技术挑战。文中利用低热导率的磁性拓扑绝缘体MnBi_(2)Te_(4)与高热导率的石... 详细信息

太赫兹技术因其在医学成像、深空探索、无线通信、无损检测等领域的应用前景而受到广泛关注。然而,常温条件下对太赫兹辐射进行高灵敏度检测仍然是一个极大的技术挑战。文中利用低热导率的磁性拓扑绝缘体MnBi_(2)Te_(4)与高热导率的石墨烯形成范德华异质结,进而构建了一种异质结结构的太赫兹探测器。室温条件下,在0.04 THz与0.12 THz的频率太赫兹辐射照射下,探测器展现出超快的光电响应速度(16μs)和较高的响应度(0.43 mA/w和4.61 mA/w),同时具备较低的噪声等效功率(2.04 nw/Hz^(1/2)和190.58 pw/Hz^(1/2))。结果表明,基于石墨烯-MnBi_(2)Te_(4)异质结的太赫兹探测器在太赫兹探测领域具有巨大的应用潜力。

关键词：太赫兹探测器光热电效应拓扑绝缘体范德华异质结

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