检索结果-南通市图书馆

National Science Review 2024年第4期11卷 130-140页

作者： Huimin Wang Zhe-ning Chen Yuanyuan Wang dongshuang wu Minna Cao Fanfei Sun Rong Cao State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences University of Chinese Academy of Sciences School of Materials Science and Engineering Nanyang Technological University Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics Chinese Academy of Sciences Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China

The absence of efficient and durable catalysts for oxygen evolution reaction（OER） is the main obstacle to hydrogen production through water splitting in an acidic ele ctrolyte.Here,we report a controllable synthesis method of surface IrOxwith changing Au/Ir compositions by constructing a range of sub-10-nm-sized core-shell nanocatalysts composed of an Au core and AuxIr1-xalloy shell.In particular,Au@Au0.43Ir0.57exhibits 4.5 times higher intrinsic OER activity than that of the commercial Ir/C.Synchrotron X-ray-based spectroscopies,electron microscopy and density functional theory calculations revealed a balanced binding of reaction intermediates with enhanced activity.The water-splitting cell using a load of 0.02 mgIr/cm2of Au@Au0.43Ir0.57as both anode and cathode can reach 10 mA/cm2at 1.52 V and maintain activity for at least194 h,which is better than the cell using the commercial couple Ir/C‖Pt/C（1.63 V,0.2 h）.

关键词： controllable synthesis of surface IrOx oxygen evolution reaction acidic water splitting catalytic stability transition metal catalysts

Replacing PVP by macrocycle cucurbit[6]uril to cap sub-5 nm Pd nanocubes as highly active and durable catalyst for ethanol electrooxidation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2019年第10期12卷 2628-2633页

作者： dongshuang wu Minna Cao Rong Cao State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

Pd nano cubes(NCs)en closed by six{100}facets are fasci nating model materials for both fun dame ntal studies and practical applicati ons.However,the only available method to prepare well-defined sub-10 nm Pd NCs was developed by Xia et al.more than 10 years ago,un avoidably using polyvinyl pyrrol id one(PVP)polymer to preve nt particle aggregati on.The strongly adsorbed PVP extremely deteriorates the catalysts*efficiency because of the high coverage of accessible surface-active sites.Numerous efforts have been devoted to replacing PVP with weaker capping agents but with limited progress predominately due to the difficulties in tuning the growth kinetics of Pd NCs.For the first time,we report that macrocycle cucurbit[6]uril(CB[6])can replace PVP in the synthesis of Pd NCs by dedicatedly controlling the growth parameters.CB[6]capped Pd NCs showed 1.1-1.5 times in creased specific surface area compared to the surfactant-free commercial Pd catalysts.Moreover,X-ray photoelectron spectroscopy dem on strated the modified electronic structure of Pd NCs through the carb onyl group of CB[6].Consequently,compared to the commercial catalysts,the obtained Pd NCs exhibited 7 times higher current density towards ethanol oxidation reaction.Remarkably,after 17 h of continuous work,it reduced deactivation by up to 1-4 orders of magnitude.

关键词： palladium cucurbituril nanocubes ethanol oxidation fuel cells

Effects of cobalt carbide on Fischer–Tropsch synthesis with MnO supported Co-based catalysts

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3期29卷 227-232页

作者： Fanfei Sun Ruoou Yang Zhaoming Xia Yuqi Yang Ziang Zhao Songqi Gu dongshuang wu Yunjie Ding Zheng Jiang Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201204China Shanghai Synchrotron Radiation Facility Zhangjiang LaboratoryShanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China University of Chinese Academy of Sciences Beijing 100100China Center for Applied Chemical Research Frontier Institute of Science and TechnologyXi’an Jiaotong UniversityXi’an 710049ShaanxiChina Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Graduate school of science Kyoto UniversityKitashirakawaOiwake-choSakyo-kuKyoto-shiKyoto-fu606-8502Japan

Cobalt carbide(Co2C)was considered as potential catalysts available for large-scale industrialization of transforming syngas(H2 and CO)to clean fuels.Herein,we successfully synthesized Co-based catalysts with MnO supported,to comprehend the effects of Co2C for Fischer–Tropsch synthesis(FTS)under ambient conditions.The huge variety of product selectivity which was contained by different active sites(Co and Co2C)has been found.Furthermore,density functional theory(DFT)shows that Co2C is efficacious of CO adsorption,whereas is weaker for H adsorption than Co.Combining the advantages of Co and Co2C,the catalyst herein can not only obtain more C5+products but also suppress methane selectivity.It can be a commendable guide for the design of industrial application products in FTS.

关键词： Cobalt carbide Fischer–Tropsch synthesis X-ray absorption fine spectroscopy nanomaterials Density functional theory

Facile ultrafine copper seed-mediated approach for fabricating quasi-two-dimensional palladium-copper bimetallic trigonal hierarchical nanoframes

在线全文

学校读者我要写书评

暂无评论

Nano Research 2017年第8期10卷 2810-2822页

作者： Min Shen Yuanbiao Huang dongshuang wu Jian Lv Minna Cao Meimei Liu Yinglong Yang Hongfang Li Binbin Guo Rong Cao State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences 155 Yangqiao West Road Fuzhou 350002 China University of Chinese Academy of Sciences Beijing 100049 China

Anisotropic Pd nanoparticles with highly branched morphologies are urgently needed as building blocks for nanoscale devices, catalysts, and sensing materials owing to their novel structures and unique physicochemical properties. However, realizing size control and branch manipulation for these materials is very challenging. In this study, we develop a facile ultrafine Cu seed-mediated approach in the aqueous phase to produce novel Pd-Cu trigonal hierarchical nanoframes （THNFs）. The main branch of most of the obtained nanocrystals is tripod-like, with advanced branches along the arms as frame units having self-similarity. In this method, the size of the Pd-Cu THNFs can be flexibly controlled by manipulating the nucleation involving the sub-3 nm Cu seeds. These Pd-Cu THNFs outperform Pd black with regard to their ethanol-oxidation performance, having a specific activity and mass activity 9.7 and 6.6 times higher, respectively. This research provides a versatile ultrafine seed-mediated approach for producing size-controlled anisotropic bimetallic nanoframes.

关键词： ultrafine seed mediation Pd-Cu hierarchical anisotropy ethanol oxidation

Pd nanocrystals stabilized by cucurbit[6]uril as efficient heterogeneous catalyst for direct C-H functionalization of polyfluoroarenes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pd nanocrystals stabilized by cucurbit[6]uril as efficient h...

Thickness-dependent enhanced optoelectronic performance of surface charge transfer-doped ReS2 photodetectors

中国化学会第九届全国无机化学学术会议

作者： Minna Cao dongshuang wu Rong Cao State key laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter the Chinese Academy of Science

Synthesis of biaryl compounds through C-H bond activation of arylation has been the focus and frontier research in the field of green chemistry and Pharmaceutical Synthesis. TAraditional homogeneous catalysts has made great achievements in this field. However, there are many issue to resolve, such as the large amount of catalysts dose, recycle problem of catalysts, and product isolation problems. Moreover, the catalytic process generally requires relatively harsh dry environments, which increases the cost of large-scale synthesis and causes environmental pollution. We succeeded in synthesizing uniformly dispersed Pd nanocomposite with sub-5 nm in size by using cucurbit[n]uril as a carrier via a simple one-pot method. With significantly noble metal loading, such nanocomposite showed high activity towards C-H bond activation with satisfactory yields of the product. The catalytic procedure was safe to air and moisture. Importantly, the developed catalytic system can be effectively recycled multiple times without obvious loss of activity with a broad range of substrates, demonstrating a good efficiency and selectivity. The research group also studied the effect of different type of cucurbit[n]uril（n=5-8） on the structure of Pd nanocomposite as well as the corresponding catalytic performance. The heterogeneous catalytic mechanism of the C-H bond activation was also verified by experimental data.

关键词： C-H functionalization Nanocatalysis Cucurbit[n]ruil Polyfluoroarenes

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Nano Research 2022年第4期15卷 3638-3646页

作者： Peiyu Zeng Wenhui Wang Jie Jiang Zheng Liu dongshuang Han Shuojie Hu Jiaoyan He Peng Zheng Hui Zheng Liang Zheng Xiaojing Yao Weitao Su Dexuan Huo Zhangting wu Zhenhua Ni Yang Zhang Lab for Nanoelectronics and NanoDevices Department of Electronics Science and TechnologyHangzhou Dianzi UniversityHangzhou 310018China School of Physics Southeast UniversityNanjing 211189China Jiangsu Province Special Equipment Safety Supervision and Inspection Institute Wuxi 214170China School of Sciences Hangzhou Dianzi UniversityHangzhou 310018China College of Physics and Hebei Advanced Thin Film Laboratory Hebei Normal UniversityShijiazhuang 050024China Institute of Materials Physics Hangzhou Dianzi UniversityHangzhou 310018China

Surface charge transfer doping has been widely utilized to tune the electronic and optical properties of semiconductor photodetectors based on low-dimensional materials.Although many studies have been conducted on the performance(response time,responsivity,etc.)of doped photodetectors and their mechanisms,they merely examined a specific thickness and did not systematically explore the dependence of doping effects on the number of layers.This work performs a series of investigations on ReS_(2)photodetectors with different numbers of layers and demonstrates that the p-dopant tetrafluorotetracyanoquinodimethane(F_(4)-TCNQ)converts the deep trap states into recombination centers for few-layer ReS_(2)and induces a vertical p-n junction for thicker ReS_(2).A response time of 200 ms is observed in the decorated 2-layer ReS_(2)photodetector,more than two orders of magnitude faster than the response of the pristine photodetector,due to the disappearance of deep trap states.A current rectification ratio of 30 in the F_(4)-TCNQ-decorated sandwiched ReS_(2)device demonstrates the formation of a vertical p-n junction in a thicker ReS_(2)device.The responsivity is as high as 2,000 A/W owing to the strong carrier separation of the p-n junction.Different thicknesses of ReS_(2)enable switching of the prominent operating mechanism between transforming deep trap states into recombination centers and forming a vertical p-n junction.The thicknessdependent doping effect of a two-dimensional material serves as a new mechanism and provides a scheme toward improving the performance of other semiconductor devices,especially optical and electronic devices based on low-dimensional materials.

关键词： Surface charge transfer doping ReS_(2) thickness response time responsivity tetrafluorotetracyanoquinodimethane(F_(4)-TCNQ)

簇-金属氧化物助剂电子相互作用调控的Ru原子簇催化剂用于温和条件下合成氨反应

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2024年第5期60卷 209-218页

作者：张天华胡海慧李嘉欣高迎龙李玲玲张明远彭渲北周岩良倪军林炳裕林建新朱兵吴冬霜张林杰韩丽丽郑黎荣王秀云江莉龙福州大学化肥催化剂国家工程研究中心福建福州350002 福州大学化学学院福建福州350002 南洋理工大学材料科学与工程学院新加坡639798 中国科学院福建物质结构研究所结构化学国家重点实验室福建福州350002 中国科学院高能物理研究所北京100049

氨是重要的化肥原料,也是颇具潜力的氢能源载体,对于可再生能源的储存、运输和终端利用至关重要.然而,传统Haber-Bosch工艺合成氨的反应条件苛刻,需要高温高压条件,并消耗大量化石能源及排放大量二氧化碳.可再生能源电解水制氢耦合温和... 详细信息

氨是重要的化肥原料,也是颇具潜力的氢能源载体,对于可再生能源的储存、运输和终端利用至关重要.然而,传统Haber-Bosch工艺合成氨的反应条件苛刻,需要高温高压条件,并消耗大量化石能源及排放大量二氧化碳.可再生能源电解水制氢耦合温和合成氨新技术(eHB),不仅能实现可再生能源电力的“消纳和调峰”,而且可进行低成本、跨地域长距离存储运输,并可将“绿氨”与氢能产业相结合.然而,现有的高温高压合成氨催化剂与eHB工艺相不匹配,因此,迫切需要开发温和条件下高效合成氨催化剂技术,以实现可再生能源电力电解制氢体系和合成氨技术互补融合.目前,虽然助剂对于Ru基纳米簇(≥1 nm)合成氨催化剂的影响规律已得到了广泛研究,但它们对于Ru原子簇催化剂的作用机制尚不清楚,需要进一步揭示.本文考察了Ba及Ce助剂对Ru原子簇催化剂的影响规律,并分析了其作用机制.首先,通过简单的浸渍法将Ba和/或Ce物种掺杂到Ru原子簇催化剂(2 wt%Ru ACCs),制得Ba/Ce/2 wt%Ru ACCs催化剂;然后,通过一系列实验考察了这些催化剂的合成氨性能,并利用多种表征手段对其进行了深入分析.合成氨性能测试结果表明,添加Ba和Ce助剂后,2 wt%Ru ACCs催化剂的合成氨速率明显提高,在400 o C和1 MPa下,Ba/Ce/2 wt%Ru ACCs催化剂的合成氨反应速率达到56.2 mmolNH_(3) gcat^(-1) h^(-1),是2 wt%Ru ACCs的7.5倍,且催化剂表现出较好的稳定性,在稳定运行140 h后活性未见明显降低.球差校正电子显微镜和X射线吸收精细结构谱结果表明,负载Ba和/或Ce后,Ru以Ru3原子簇形式存在.X射线吸收近边结构谱和X射线光电子能谱结果表明,Ru与Ba及Ce物种之间存在较强的簇-金属氧化物助剂电子相互作用,可促进电子转移到Ru物种,形成富电子状态的Ru,进而促使电子转移到N2的p*反键轨道,提高温和条件下合成氨反应速率.利用25%N2+75%D2气氛下的原位红外光谱研究催化剂的合成氨反应机理,结果表明,在Ba/Ce/2 wt%Ru ACCs催化剂表面同时检测到N2D2物种和N2Dx物种的振动吸收峰,说明添加Ba和/或Ce物种没有改变Ru原子簇催化剂活化N2的方式,N2仍是通过加氢的路径合成氨.综上,本文考察了助剂对Ru原子簇的影响规律,揭示了其作用机制,为设计高效的温和条件合成氨催化剂提供参考.

关键词：原子簇助剂 N2活化合成氨电子相互作用

Servicizing and construction of the reuse system of schoolbook

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ecological Economy 2008年第2期4卷 207-215页

作者： Yang Tongyu Zhang Changjiang wu dongshuang School of Economies and Management NanJing University of Technology Nanjing 210009 P. R. China

Recently the phenomenon of disposable schoolbook in China not only has wasted so many resources that produce unfavorable influence, but also has increased unnecessary impact burdens on consumptions of Chinese families. The paper analyzes value of the reuse of schoolbooks and main obstacles, introduces the concept of servi-cizing, discusses the problem of the reuse of schoolbooks from construction of product-service system, and puts for-ward that realization of the reuse of schoolbooks depends on innovation of present system and model. Construction of schoolbook-service system needs shift from value to consumption habits and behaviors, and active participation of every social class.

关键词：教科书重复利用系统中国环境保护

黑龙江自贸区背景下国贸专业跨境电商人才培养模式研究

在线全文

学校读者我要写书评

暂无评论

商业经济 2022年第8期 106-108页

作者：季克华吴东爽刘扬刘冰魏静哈尔滨石油学院哈尔滨商业大学黑龙江哈尔滨150028

中国(黑龙江)自由贸易试验区成立后,哈尔滨片区又成为跨境电商综试区,黑河和绥芬河也有自己的跨境电商试验区。近年来,黑龙江跨境电商发展迅猛,然而却存在实践教学体系不完善、国贸专业课程设置落后、跨境电商师资队伍严重缺乏等问题,... 详细信息

中国(黑龙江)自由贸易试验区成立后,哈尔滨片区又成为跨境电商综试区,黑河和绥芬河也有自己的跨境电商试验区。近年来,黑龙江跨境电商发展迅猛,然而却存在实践教学体系不完善、国贸专业课程设置落后、跨境电商师资队伍严重缺乏等问题,应从构建产教融合培养体系、构建国贸专业跨境电商课程体系、打造双师型教师队伍等方面创新培养模式,为黑龙江自贸区成为对俄跨境电商的排头兵提供人才支撑。

关键词：黑龙江自贸区国贸跨境电商

在线全文

学校读者我要写书评

暂无评论

一类SARS流行病模型的稳定性分析

武汉理工大学学报（信息与管理工程版） 2009年第5期31卷 723-725页

作者：张冬爽吴传生武汉理工大学理学院湖北武汉430070

在K-M传染病模型的基础上,进一步考虑易感人群的密度制约等因素,建立了描述SARS流行病的新的动力学模型,得到了疾病绝灭与否的阈值(基本再生数R0),分析了该模型的稳定性态,揭示了隔离对疾病控制的积极作用。

关键词： SARS流行病基本再生数平衡点局部渐近稳定全局渐近稳定