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High-performance Fe-N-C electrocatalysts with a "chain mail" protective shield

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Nano Materials Science 2021年第4期3卷 420-428页

作者： Zixun Yu Chang Liu junsheng chen Ziwen Yuan Yuan chen Li Wei School of Chemical and Biomolecular Engineering The University of SydneyDarlingtonNSW2006Australia

Nitrogen-coordinated iron atoms on carbon supports(Fe-N-C)are among the most promising noble-metal-free electrocatalysts for oxygen reduction reaction(ORR).However,their unsatisfactory stability limits their prac-tical ***,we demonstrate a dual-shell Fe-N-C electrocatalyst with excellent catalytic activity and long-term *** and dopamine are sequentially polymerized on a fumed silica nanoparticle *** precursor(FeCl_(3))and pore formation agent(ZnCl_(2))were loaded on the inner polypyrrole *** carbonization,the Zn evaporation creates abundant mesopores in the polydopamine-derived outer carbon shell,forming a "chain mail"like outer shell that protects Fe-N-C active sites loaded on the inner carbon shell and enables efficient mass *** tuning of the shield thickness and porosity affords the optimal electrocatalyst with a large surface area of 934 m^(2)g^(-1) and a high Fe loading of 2.04 wt%.This electrocatalyst delivers excellent ORR activity and superior stability in both acidic and alkaline *** Zn-air batteries fabricated from this electrocatalyst delivers a high-power density of 257 mW cm^(-2) and impressive durability of continuous discharging over 250 *** a graphitic and porous carbon protective shell can be further extended to other electrocatalysts to enable their practical applications in energy conversion and storage.

关键词： Fe-N-C catalyst Oxygen reduction reaction Stability Zinc-air battery

Preparation and Characterization of PEDOT Films for NO_2 Gas Sensors

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稀有金属材料与工程 2006年第A03期35卷 178-179页

作者： Hongjuan Zeng Yadong Jiang Guangzhong Xie junsheng Yu Cuiping chen School of Optoelectronic Information University of Electronic Science and Technology of China Chengdu 610054 China

A novel NO_2 gas sensor was constructed by depositing poly(3,4-ethylenedioxyphioen)(PEDOT)films on the surface of interdigital *** conducting polymer PEDOT films were prepared by chemical *** conductibility tests indicated that the resistances of PEDOT films increased with the increase of NO_2 *** mechanism of increasing resistance of PEDOT films could be suggested that electrons of NO_2-gas acted as the electron donor to p-type semiconductor of PEDOT with the consequence of reducing the numbers of holes in the PEDOT and the increase resistance of the thin *** linear relationship between the shift of resistance and the concentration of NO_2 existed in a range from 10μg/g to 30μg/*** sensitivity of PEDOT films to NO_2 was 10Ω/10^(-6).

关键词： conducting polymer preparation characterization NO2-sensitivity

Embedded Scenario Clustering for Wind and Photovoltaic Power,and Load Based on Multi-head Self-attention

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Protection and Control of Modern Power Systems 2024年第1期9卷 122-132页

作者： Lijun Liu Xin Hu junsheng chen Ruixing Wu Feixiong chen School of Electrical Engineering and Automation Fuzhou UniversityFuzhou 350108China State Grid Fuzhou Power Supply Company Fujian Smart Electrical Engineering Technology Research Center

The source and load uncertainties arising from increased applications of renewable energy sources such as wind and photovoltaic energy in the power system have had adverse effects on optimal planning and *** for generating typical renewable energy and load scenarios are constructed to reduce such effects and improve the applicability of a planning and optimal dispatching model of power systems with a high proportion of renewable *** traditional clustering-based model for representing such scenarios cannot handle high-dimensional time-series data and consequently the feature-related information obtained cannot fully reflect the characteristics of the ***,a deep convolutional embedded clustering model based on multi-head self-attention is ***,a variational mode decomposition model is optimized to reduce the influence of noise-related signals on the feature *** deep features are then extracted from the data using an improved convolutional autoencoder,and the appropriate number of clusters is determined using the elbow *** this,the network parameters are optimized based on the sum of losses during reconstruction and ***,typical scenarios are then generated based on the optimized network ***,the proposed method is evaluated based on data visualization and evaluation *** is shown that the quality of features and the accuracy of clustering can be effectively improved by the proposed scenario generation method.

关键词： handle Embedded network

Analysis of genetic alterations identifies the frequent mutation of GNAS in colorectal laterally spreading tumors

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Cancer Communications 2020年第11期40卷 636-640页

作者： Lei Pan junsheng chen Chaojun Zhu Lu Han Aimin Li Side Liu Guangdong Provincial Key Laboratory of Gastroenterology Department of GastroenterologyNanfang HospitalSouthern Medical UniversityGuangzhouGuangdong 510515P.R.China

Dear Editor,Colorectal cancer(CRC)is among the most commonly diagnosed cancer and the leading cause of cancer-related death worldwide[1].Most CRCs develop from *** spreading tumors(LSTs)are non-polypoid superficial colorectal neoplasms(CRNs)that are larger than 1 cm and typically extend laterally along the luminal *** on surface morphology,it can be classified into a granular or nongranular *** pathological morphology of LST manifests only as adenoma or with *** studies have characterized 45-79%of LSTs as high-grade intraepithelial neoplasia(HGIN)or submucosal invasion;and the risk of submucosal invasion increases with lesion size[2].Hence,LST is considered a precancerous CRC *** with LSTs are usually asymptomatic and diagnosis typically occurs during physical examinations or screening colonoscopy.

关键词： invasion colorectal alterations

Phase-mediated cobalt phosphide with unique core-shell architecture serving as efficient and bifunctional electrocatalyst for hydrogen evolution and oxygen reduction reaction

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Chinese Chemical Letters 2022年第8期33卷 3752-3756页

作者： junsheng chen Jianfeng Huang Hai Wang Weihang Feng Tianmi Luo Yuzhu Hu chengke Yuan Liyun Cao Yanni Jie Koji Kajiyoshi Yongqiang Feng School of Material Science and Engineering International S&T Cooperation Foundation of Shaanxi ProvinceXi'an Key Laboratory of Green Manufacture of Ceramic MaterialsShaanxi University of Science and TechnologyXi'an 710021China Kochi University Research Laboratory of Hydrothermal ChemistryKochi 780-8520Japan

Hydrogen evolution reaction(HER)and oxygen reduction reaction(ORR)have been considered as two critical processes in the field of electrocatalytic water-splitting for hydrogen production and fuel ***,the sluggish reaction kinetics of HER and ORR required efficient electrocatalyst such as Pt to promote such *** metal phosphides(TMPs)exhibit great potential to replace noble metal electrocatalysts to accelerate HER and ORR due to their high activity and easy ***,a highly-efficient bifunctional CoP electrocatalyst for HER and ORR,featuring a unique core-shell structure decorated on nitrogen-doped carbon matrix was designed and constructed via etching a cobalt-based zeolitic imidazolate framework(ZIF-67)with phytic acid(PA)followed by pyrolysis treatment(PA-ZIF-67-900).Experimental results revealed that the pure-phase single-crystalline Co P exhibited outstanding electrocatalytic performance in HER and ORR,superior to Co(PO_(3))_(2) in PA-ZIF-67-700,hybrid phase of Co(PO_(3))_(2) and CoP in PA-ZIF-67-800 and Co_(2)P-doped CoP in *** reach the current density of 10 mA/cm^(2)the as-synthesized Co P required an overpotential of 120 m V for HER in 1 mol/L KOH and half-wave potential of 0.85 V in O_(2)-saturated 0.1 mol/L *** work present new clue for construction of efficient and bifunctional electrocatalyst in the field of energy conversion and storage.

关键词： Electrocatalyst Hydrogen evolution reaction Oxygen reduction reaction Transitional metal phosphide CoP

盾构隧道管片施工阶段力学行为的三维有限元分析

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岩石力学与工程学报 2006年第z2期25卷 3482-3489页

作者：陈俊生莫海鸿华南理工大学土木工程系广东广州510640

管片是盾构隧道最基本的结构单元,与正常使用阶段相比,管片在施工阶段承受的荷载及相应的力学行为均有较大差异。从工程经验可知,管片开裂多发生在施工阶段,因此对管片在施工阶段力学行为的研究尤为重要。采用三维有限元法,利用通用有... 详细信息

管片是盾构隧道最基本的结构单元,与正常使用阶段相比,管片在施工阶段承受的荷载及相应的力学行为均有较大差异。从工程经验可知,管片开裂多发生在施工阶段,因此对管片在施工阶段力学行为的研究尤为重要。采用三维有限元法,利用通用有限元软件ADINA,建立一段具有9环管片的盾构隧道数值模型。通过加入与施工阶段相对应的注浆压力、千斤顶顶力及初步引入盾尾刷的挤压作用,分析盾构隧道的变形特点及应力分布。分析结果表明,在施工阶段,管片外荷载沿隧道纵向的差异使管片环的位移及应力沿隧道纵向产生变化,各环变形的特征也不相同。由于楔形块构造的原因,使得在均匀的注浆压力下,管片环仍然出现平面外的位移,并造成一定的错台量。若注浆压力不均匀,错台量将增大,甚至能造成管片开裂。千斤顶顶力对施工阶段管片的位移、应力有明显的影响,千斤顶顶力作用是管片在施工状态下最不利的工况。

关键词：隧道工程盾构隧道管片力学行为三维有限元分析

Facile synthesis of defect-rich Fe-N-C hybrid from fullerene/ferrotetraphenylporphyrin as efficient oxygen reduction electrocatalyst for Zn-air battery

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Chinese Chemical Letters 2023年第5期34卷 616-620页

作者： Hai Wang Liyun Cao Yongqiang Feng junsheng chen Weihang Feng Tianmi Luo Yuzhu Hu chengke Yuan Yajuan Zhao Yong Zhao Koji Kajiyoshi Yijun Liu Zhenjiang Li Jianfeng Huang School of Material Science and Engineering International S&T Cooperation Foundation of Shaanxi ProvinceShaanxi University of Science and TechnologyXi'an 710021China Kochi University Research Laboratory of Hydrothermal ChemistryKochi 780-8520Japan Guangdong Mona Lisa Group Co. Ltd.Foshan 528211China College of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266042China

Exploring remarkable oxygen reduction reaction(ORR)electrocatalysts for regenerative fuel cells and metal-air batteries is highly ***,a novel non-noble metal-based heterogeneous electrocatalyst with rich defects were successfully synthesized by liquid-liquid interfacial precipitation(LLIP)of fullerene(C_(60))and ferrotetraphenylporphyrin(FeTPP)followed by one step *** obtained product annealed at 700℃(C_(60)/FeTPP-700),when employed as ORR electrocatalyst,revealed a positive halfwave potential(E_(1/2))of 0.877 V *** hydrogen electrode(RHE),which was superior to that of the commercial 25%Pt/***,the assembled Zn-air battery(ZAB)using C_(60)/FeTPP-700 as an air-electrode catalyst exhibited a high power density of 153 m W/cm^(2),specific capacity of 668 mAh/g and long-term cycling stability for more than 250 *** results proved that the excellent electrocatalytic ORR activity of C_(60)/FeTPP-700 would attribute to the synergistic effect between FeN_xsites,Fe_(3)C/Fe nanoparticles and the structure *** work provides a feasible and simple method to prepare nonnoble metal-based ORR electrocatalysts for the application of energy storage and conversion.

关键词： Oxygen reduction reaction Electrocatalyst Fullerene Defect Zn-air battery

Photophysical Properties of Metallosupramolecular Coordination Assemblies with Different Conformational Geometries

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Photophysical Properties of Metallosupramolecular Coordinati...

江西大湖塘矿区九岭花岗闪长岩的成因及其构造意义

第十三届全国化学动力学会议

作者： junsheng chen Guangjiu Zhao Keli Han State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Sciences

＜正＞We employed spectroscopic techniques and quantum chemistry calculations to investigate the photophysical properties of various multinuclear platinum complexes with different conformational geometries. This suite...

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岩石学报 2017年第3期33卷 907-924页

作者：孙克克陈斌陈军胜项新葵造山带与地壳演化教育部重点实验室北京大学地球与空间科学学院北京100871 合肥工业大学资源与环境工程学院合肥230009 国土资源部中央地质勘查基金管理中心北京100812 江西省地质矿产勘查开发局九一六大队九江332100

江南造山带东段发育了一系列新元古代花岗岩类侵入体,其中以江西九岭岩体最为显著。锆石U-Pb定年结果表明九岭岩体形成于819Ma。富云母暗色包体在九岭花岗闪长岩体内部广泛出现,典型的岩浆结构及针状磷灰石表明包体为岩浆成因。花岗闪... 详细信息

江南造山带东段发育了一系列新元古代花岗岩类侵入体,其中以江西九岭岩体最为显著。锆石U-Pb定年结果表明九岭岩体形成于819Ma。富云母暗色包体在九岭花岗闪长岩体内部广泛出现,典型的岩浆结构及针状磷灰石表明包体为岩浆成因。花岗闪长岩及暗色包体的Mg~#(42~50)均大于玄武质岩石熔融实验结果(大多数<40)。暗色包体具有更高的MgO、CaO、Fe_2O_3~T、TiO2及更高的Ni、Co、Sc、V。全岩Sm-Nd同位素结果显示暗色包体的ε_(Nd)(t)为-3.4^-2.1,花岗闪长岩ε_(Nd)(t)为-4.0^-3.5。花岗闪长岩锆石的ε_(Hf)(t)为(-1.4~6.4),多数为正值。Nd-Hf同位素分析表明双桥山群很可能是花岗闪长岩的源区。暗色岩浆包体的普遍发育暗示九岭岩体形成于壳幔岩浆混合过程,除双桥山群外,地幔也贡献了一定的物质。暗色富云包体不是岩石熔融的残渣,而是幔源基性岩浆与富钾下地壳相互作用的产物。结合区域上变质岩、地层学、基性岩研究结果,我们认为扬子板块与华夏板块碰撞的时间很可能在825Ma左右,九岭岩体形成于造山带碰撞挤压向伸展转变的过渡阶段,是壳幔岩浆混合的产物。

关键词：江南古陆九岭岩体暗色包体锆石U-Pb定年 Nd-Hf同位素