检索结果-南通市图书馆

Hydrothermal synthesis of polyimide-linked covalent organic frameworks towards ultrafast and stable cathodic sodium storage

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第4期67卷 1300-1310页

作者： xiya yang Lei Gong Zhixin Liu Qianjun Zhi Baoqiu Yu Xin Chen Kang Wang Xiaofeng Li Dongdong Qi Jianzhuang Jiang Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline MaterialsDepartment of Chemistry and Chemical EngineeringSchool of Chemistry and Biological EngineeringUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory of Organic-Inorganic Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China

Redox-active organic materials are capturing growing attention as cathode materials for sustainable alkaline metal ion ***,the storage of Na+in most organic materials-based cathodes is plagued by low capacity and unsatisfying rate performance due to their low active site densities and limited exposed active ***,two polyimide-linked covalent organic frameworks(COFs),namely HATN-PD-COF and HATN-TAB-COF,were fabricated from hydrothermal synthesis with redoxactive triphenylene-2,3,6,7,10,11-hexacarboxylic acid and aromatic amines as starting *** X-ray diffraction and electron microscopy analysis indicate the high crystalline nature of these COFs with AA stacking configuration and orderly mesoporous tunnel.N_(2) sorption measurement discloses the permanent porosity of these two COFs with a Brunauer-EmmettTeller surface area of 1,065-1,200 m^(2)g^(-1)and a large pore size of 2.0-3.1 *** intermittent titration technique and density functional theory calculations reveal the facile Na+ion diffusion along the mesoporous tunnel of these COFs with a small energy barrier of 0.13-0.40 e *** particular,the as-prepared COFs based-cathodes show ultrafast and stable Na+storage associated with their conjugated electronic structure,highly ordered mesoporous tunnel,robust structure,and redox-active C=N/C=O-rich framework as exemplified by the high reversible capacity of 210 m A h g^(-1)at 200 m A g^(-1),record-high rate performance(195 m A h g^(-1)at a high current density of 10,000 m A g^(-1))among organic electrodes and the capacity retention of nearly 91%at 10,000 m A g^(-1)after 7,000 cycles for HATN-PD-COF.

关键词： covalent organic framework sodium ion battery cathode high rate organic electrode

Fe-doped Co_(3)O_(4) nanowire strutted 3D pinewood-derived carbon: A highly selective electrocatalyst for ammonia production via nitrate reduction

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第4期17卷 2276-2282页

作者： Xuwei Liu Chaozhen Liu Xun He Zhengwei Cai Kai Dong Jun Li Xiaoya Fan Ting Xie xiya yang Yonglan Luo Dongdong Zheng Shengjun Sun Sulaiman Alfaifi Feng Gong Xuping Sun Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 211189China College of Chemistry Chemical Engineering and Materials ScienceShandong Normal UniversityJinan 250014China Chemistry Department Frontier of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia

Nitrate(NO_(3)^(-)),a nitrogen-containing pollutant,is prevalent in aqueous solutions,contributing to a range of environmental and health-related *** electrocatalytic reduction of NO_(3)^(-)holds promise as a sustainable approach to both eliminating NO_(3)^(-)and generating valuable ammonia(NH_(3)).Nevertheless,the reduction reaction of NO_(3)^(-)(NO_(3)^(-)RR),involving 8-electron transfer process,is intricate,necessitating highly efficient electrocatalysts to facilitate the conversion of NO_(3)^(-)to NH_(3).In this study,Fe-doped Co_(3)O_(4) nanowire strutted three-dimensional(3D)pinewood-derived carbon(Fe-Co_(3)O_(4)/PC)is proposed as a high-efficiency NO_(3)^(-)RR electrocatalyst for NH_(3) *** within 0.1 M NaOH containing NO_(3)^(-),Fe-Co_(3)O_(4)/PC demonstrates exceptional performance,obtain an impressively large NH_(3) yield of 0.55 mmol·h^(-1)·cm^(-2) and an exceptionally high Faradaic efficiency of 96.5%at-0.5 V,superior to its Co_(3)O_(4)/PC counterpart(0.2 mmol·h^(-1)·cm^(-2),73.3%).Furthermore,the study delves into the reaction mechanism of Fe-Co_(3)O_(4) for NO_(3)^(-)RR through theoretical calculations.

关键词： Fe-doped Co_(3)O_(4) nanowire pinewood-derived carbon electrocatalytic NO_(3)-reduction NH_(3) synthesis density functional theory

Tri-functionalized TiOxCl4-2x accessory layer to boost efficiency of hole-free, all-inorganic perovskite solar cells

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2020年第11期29卷 1-8页

作者： Qingwei Zhou Jialong Duan Yudi Wang xiya yang Qunwei Tang Institute of New Energy Technology College of Information Science and TechnologyJinan UniversityGuangzhou 510632GuangdongChina

Tin dioxide(SnO2) is generally regarded as a promising electron-transporting layer(ETL) for state-of-theart perovskite solar cells(PSCs), however, the ubiquitous oxygen-vacancy-related defects at SnO2 surface and the large energy difference between conduction band of SnO2 and perovskite layer undoubtedly cause severe charge carrier recombination, resulting in sluggish charge extraction efficiency and non-negligible open-circuit voltage(Voc) loss. Herein, a chlorine-containing TiOxCl4-2x accessory layer is fabricated by immersing SnO2 layer into the TiCl4 aqueous solution to passivate the surface oxygen-vacancy-related defects of SnO2 layer and to set an intermediate energy level at ETL/perovskite interface in all-inorganic cesium lead tri-bromine(CsPbBr3) PSCs. Furthermore, the TiOxCl4-2x layer also improves the infiltration of SnO2 layer surface toward perovskite precursor for high-quality perovskite film. Finally, the hole-free, allinorganic CsPbBr3PSC with a structure of FTO/SnO2/TiOxCl4-2x/Cs0.91Rb0.09PbBr3/carbon achieves a champion efficiency of 10.44% with a Vocas high as 1.629 V in comparison to 8.31% for control device. Moreover, the optimized solar cell presents good stability in 80% humidity in air.

关键词： All-inorganic perovskite solar cells Electron-transporting layer Cesium lead bromine Charge recombination Stability

Reducing defect of inorganic perovskite film by sulphur-containing Lewis base for robust photodetectors

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2021年第10期30卷 163-169,I0005页

作者： Jian Du Jialong Duan xiya yang Qingwei Zhou Yanyan Duan Tingting Zhang Qunwei Tang Institute of New Energy Technology College of Information Science and TechnologyJinan UniversityGuangzhou 510632GuangdongChina State Centre for International Cooperation on Designer Low-Carbon and Environmental Material(SCICDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001HenanChina Guangdong Provincial Key Laboratory of Development and Education for Special Needs Children Lingnan Normal UniversityZhanjiang 524048GuangdongChina

Sluggish charge transfer in perovskite film induced by inherent defects such as uncoordinated Pb2+undoubtedly hinders the rapid response of self-powered photovoltaic-typed *** on interaction between Lewis acids and bases,herein,we employ thiourea molecule as a multifunctional Lewis base to significantly improve the quality of all-inorganic CsPbIBr2 perovskite *** careful characterizations,the quality of perovskite film has been well *** from the reduced defect and the reinforced the interfacial charge extraction owing to the strong interaction between uncoordinated Pb2+ions and the-C=S groups in thiourea and the formation of hydrogen bond at perovskite/TiO_(2) interface,an enhanced responsivity of 0.335 A W-1 and specific detectivity of 3.92×10^(12) Jones has been achieved for the self-powered,carbon-electrode based photodetector,which is comparable to the state-of-theart device based on CsPbIBr2 *** importantly,the device free of encapsulation remains 82.8%of initial performance after storage over 56 days in ambient atmosphere,promoting the practical deployment of perovskite products.

关键词： All-inorganic perovskite Self-powered photodetector Defect passivation Charge transfer Stability

Stretchable alkenamides terminated Ti_(3)C_(2)T_(x)MXenes to release strain for lattice-stable mixed-halide perovskite solar cells with suppressed halide segregation

在线全文

学校读者我要写书评

暂无评论

Carbon Energy 2023年第12期5卷 21-30页

作者： Xuemei Yao Jialong Duan Yuanyuan Zhao Junshuai Zhang Qiyao Guo Qiaoyu Zhang xiya yang Yanyan Duan Peizhi yang Qunwei Tang Institute of Carbon Neutrality College of Chemical and Biological EngineeringShandong University of Science and TechnologyQingdaoShandongChina Key Laboratory of Advanced Technique and Preparation for Renewable Energy Materials Ministry of EducationYunnan Normal UniversityKunmingYunnanChina College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdaoShandongChina College of Information Science and Technology Jinan UniversityGuangzhouGuangdongChina School of Materials Science and Engineering State Centre for International Cooperation on Designer Low-Carbon and Environmental Material(SCICDLCEM)Zhengzhou UniversityZhengzhouHenanChina

Bandgap-tunable mixed-halide perovskite materials have attracted considerable interest because of their indispensability as top counterparts in tandem solar ***,the soft and disordered lattice always suffers from severe phase segregation under illumination,which is particularly susceptible to residual lattice ***,we report a strain regulation strategy by using alkenamides terminated Ti_(3)C_(2)T_(x)MXenes as an additive into perovskite *** from the role of a template for grain growth to obtain high-quality films,the stretchable alkyl chain promotes lattice shrinkage or expansion to form an elastic grain boundary to eliminate the spatially distributed stain and shut down ion migration *** a result,the all-inorganic perovskite solar cells based on CsPbIBr_(2)and CsPbI_(2)Br halides achieve prolonged device stability under harsh conditions and the best power conversion efficiencies up to 11.06%and 14.30%,respectively.

关键词： all-inorganic perovskite solar cells defect passivation halide segregation stability strain relaxation

高血压与恶性肿瘤的因果关系:一项孟德尔随机化研究

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国现代医生 2024年第25期62卷 40-46页

作者：毛若馨赵希雅陈钰丹陈欣怡杨茜雅顾嘉静何文明宁波大学附属第一医院心血管内科浙江宁波315010

目的评估14种恶性肿瘤与高血压之间的因果关系。方法使用全基因组关联研究的公开数据集,从中提取与高血压、14种恶性肿瘤强相关的独立遗传变异作为工具变量进行双向孟德尔随机化(Mendelian randomization,MR)分析,包括随机效应逆方差加... 详细信息

目的评估14种恶性肿瘤与高血压之间的因果关系。方法使用全基因组关联研究的公开数据集,从中提取与高血压、14种恶性肿瘤强相关的独立遗传变异作为工具变量进行双向孟德尔随机化(Mendelian randomization,MR)分析,包括随机效应逆方差加权(inverse variance weighted,IVW)、简单模式、加权中位数、加权模式和MR-Egger评估因果效应,通过敏感度分析检验分析结果的有效性和稳健性,并通过多变量MR分析进一步控制混杂因素的影响。结果在恶性黑色素瘤与高血压的MR分析中,共纳入11个与恶性黑色素瘤强相关的单核苷酸多态性(single nucleotide polymorphism,SNP),经Bonferroni校正,基于IVW的结果显示,恶性黑色素瘤与高血压的发生具有因果关系(OR=1.67,95%CI:1.27~2.21,P<0.001)。经Cochran’s Q检验、孟德尔随机多效性残差和异常值检验及MR-Egger截距测试显示工具变量之间均不存在离群值及水平多效性,留一法敏感度分析显示不存在对整体结果有较大影响单个SNP。高血压与白血病的初步分析结果显示二者可能存在关系,但在逐次调整混杂因素后高血压对白血病发生风险的影响不再具有显著性。结论恶性黑色素瘤可能是发生高血压的危险因素。

关键词：高血压恶性肿瘤孟德尔随机化单核苷酸多态性

维普期刊数据库博看期刊

在线全文

学校读者我要写书评

暂无评论

热轧高强结构钢折弯开裂原因分析及对策

山东冶金 2024年第1期46卷 10-12页

作者：贾崇雪杨西亚单修迎赵统国山东钢铁集团日照有限公司山东日照276800

为降低热轧高强结构钢折弯开裂率,对开裂试样做了成分和性能检测,并对开裂部位做了金相扫描和电镜分析,结果显示钢板内存在尺寸较大的硫化物夹杂和数量较多的铝酸钙夹杂是导致折弯开裂的主要原因。基于此结果,提出了炼钢工艺优化方案,... 详细信息

为降低热轧高强结构钢折弯开裂率,对开裂试样做了成分和性能检测,并对开裂部位做了金相扫描和电镜分析,结果显示钢板内存在尺寸较大的硫化物夹杂和数量较多的铝酸钙夹杂是导致折弯开裂的主要原因。基于此结果,提出了炼钢工艺优化方案,取得了较好的效果。

关键词：高强结构钢折弯开裂硫化物夹杂

Two-dimensional conjugated N-rich covalent organic frameworks for superior sodium storage

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2022年第7期65卷 1291-1298页

作者： xiya yang Yucheng Jin Baoqiu Yu Lei Gong Wenbo Liu Xiaolin Liu Xin Chen Kang Wang Jianzhuang Jiang Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline MaterialsDepartment of Chemistry and Chemical EngineeringSchool of Chemistry and Biological EngineeringUniversity of Science and TechnologyBeijing 100083China

Sodium-ion batteries(SIBs) are considered as a promising next-generation energy storage system. To achieve the large-scale application of SIBs, it is crucial to develop cost-effective anode materials with high Na-ion storage capacity. Herein twodimensional(2D) conjugated covalent organic frameworks(c COFs) with N-rich phthalocyanine(Pc) units fused via benzene moieties(named MPc-2D-c COFs) were explored as the SIBs anode materials. Electrochemical tests reveal their high reversible capacities of 538 and 342 m A h g^(-1) at 50 and 1000 m A g^(-1), respectively, good rate performance, and excellent stability,comparable to the state-of-the-art anode materials of SIBs, indicating their outstanding Na-ion storage performance. Ex situ Xray photoelectron and Fourier transform infrared spectroscopies together with theoretical calculations disclose the N atoms at the pore channels and conjugated pyrrole moieties of MPc-2D-c COFs provide abundant Na-ion storage sites. This, in cooperation with the enhanced electrical conductivity owing to the 2D conjugated structure, contributes to the outstanding Na-ion storage capacity of MPc-2D-c COFs. The present result is surely helpful for developing high-performance and cost-effective COFs as electroactive materials for SIBs.

关键词： covalent organic frameworks sodium-ion batteries phthalocyanine anode materials π-conjugated 2D COFs

Covalent organic frameworks with imine proton acceptors for efficient photocatalytic H_(2) production

在线全文

学校读者我要写书评

暂无评论

中国化学快报:英文版 2023年第10期34卷 265-269页

作者： Xiaolin Liu xiya yang Xu Ding Hailong Wang Wei Cao Yucheng Jin Baoqiu Yu Jianzhuang Jiang Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline MaterialsDepartment of Chemistry and Chemical EngineeringSchool of Chemistry and Biological EngineeringUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory of NBC Protection for Civilian Beijing 102205China

Covalent organic frameworks (COFs) are promising crystalline materials for the light-driven hydrogen evolution reaction (HER) due to their tunable chemical structures and energy band ***,deeply understanding corresponding mechanism is still challenging due to the multiple components and complicated electron transfer and reduction paths involved in photocatalytic ***,the photocatalytic HER investigation has been reported based on three COFs catalysts,1–3,which are prepared by benzo[1,2-b:3,4-b’:5,6-b’]trithiophene-2,5,8-trialdehyde to react with C3symmetric triamines including tris(4-aminophenyl)amine,1,3,5-tris(4-aminophenyl)benzene,and (1,3,5-tris-(4-aminophenyl)triazine,*** the isostructural hexagonal honeycomb-type COF of 2 and 3 reported previously,the crystal structure of 1 has been carefully correlated through the powder X-ray diffraction study with the help of theoretical simulations.1 shows highly porous framework with Brunauer-Emmett-Teller surface area of1249 m^(2)/***,the introduction of ascorbic acid into the photocatalytic system of COFs achieves the hydrogen evolution rate of 3.75,12.16 and 20.2 mmol g^(–1)h^(–1) for 1–3,*** important role of ascorbic acid in photocatalysis of HER is disclosed to protonate the imine linkages of these COFs,leading to the obvious absorbance red-shift and the improved charge separation efficiency together with reduced resistance in contrast to pristine materials according to the spectroscopic and electronic *** innovations of chemical and physical properties for these COFs are responsible for their excellent photocatalytic *** results elucidate that tiny modifications of COFs structures is able to greatly tune their band structures as well as catalytic properties,therefore providing an available approach for optimizing COFs functionalities.

关键词： Covalent organic framework Photocatalysis Hydrogen evolution reaction Imine linkage Protonation