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Nano Research 2018年第12期11卷 6375-6383页

作者： Changshuai Shang yaxiao guo Erkang Wang State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Chinese Academy of Sciences Beijing 100049China

As an attempt to minimize the usage amounts of noble metals in catalysis, PtAg alloy nanocrystals with a porous nanosheet morphology were fabricated through a galvanic replacement reaction. During the reaction, ascorbic acid was added to the solution to protect the Ag triangular nanoplates from being totally etched. Structural characterizations indicated that the obtained nanocrystals had thin porous basal planes and winding edges with abundant bulges. Such unique two-dimensional porous architectures endowed this nanomaterial with plenty of catalytically active sites and structural benefits in electron and mass moving, as well as morphology stability. Electrochemical tests proved that the PtAg porous nanosheets had superior catalytic activity and durability towards methanol electrooxidation in basic media. Specifically, the mass and specific activities of the PtAg porous nanosheets were 4.5 and 2.7 times higher than those of a commercial Pt/C catalyst. In addition to the special structures, the introduction of Ag enhanced the catalytic performances of the PtAg porous nanosheets.

关键词： platinum silver porous nanosheets two-dimensional methanol electrooxidation

Facile fabrication of PdRuPt nanowire networks with tunable compositions as efficient methanol electrooxidation catalysts

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Nano Research 2018年第8期11卷 4348-4355页

作者： Changshuai Shang yaxiao guo Erkang Wang State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of SciencesChangchun 130022 China University of Chinese Academy of Sciences Beijing 100049 China

The preparation of nanomaterials with superior catalytic properties through simple and rapid protocols is a task of great importance. In the present study, we demonstrate the direct synthesis of trimetaUic PdRuPt nanowire networks through the reduction of the corresponding metal precursors with NaBH4, in the presence of KBr and polyvinylpyrrolidone （PV-P）. The elemental composition of the final products could be easily tuned by varying the added amounts of metal precursors. The obtained nanomaterials were then used as catalysts for methanol electrooxidation in an acidic medium. Among the synthesized PdRuPt and PtPd nanowire networks, Pd0.97Ru0.44Pt exhibits the highest catalytic activity and durabili~ along with a specific activity 3.5 times higher than that of commercial Pt/C. The enhanced catalytic properties of the present nanowire systems are attributed to their unique structures and the introduction of Ru into PtPd nanocrystals with outstanding *** preparation of nanomaterials with superior catalytic properties through simple and rapid protocols is a task of great importance. In the present study, we demonstrate the direct synthesis of trimetaUic PdRuPt nanowire networks through the reduction of the corresponding metal precursors with NaBH4, in the presence of KBr and polyvinylpyrrolidone （PV-P）. The elemental composition of the final products could be easily tuned by varying the added amounts of metal precursors. The obtained nanomaterials were then used as catalysts for methanol electrooxidation in an acidic medium. Among the synthesized PdRuPt and PtPd nanowire networks, Pd0.97Ru0.44Pt exhibits the highest catalytic activity and durability along with a specific activity 3.5 times higher than that of commercial Pt/C. The enhanced catalytic properties of the present nanowire systems are attributed to their unique structures and the introduction of Ru into PtPd nanocrystals with outstanding properties.

关键词： palladium ruthenium platinum nanowire networks methanol electrooxidation

Efficient electrocatalytic reduction of nitrate to ammonia at low concentration by copper-cobalt oxide nanowires with shell-core structure

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Nano Research 2024年第6期17卷 5087-5094页

作者： Chenhao Xiao yaxiao guo Jiayuan Sun Tao guo Xinyuan Jia Shinuo guo Guancheng Wu Yue Sun Zhaoyang Yao Yi Liu State Key Laboratory of Separation Membranes and Membrane Processes School of ChemistryTiangong UniversityTianjin 300387China Key Laboratory of Functional Polymer Materials College of ChemistryNankai UniversityTianjin 300071China School of Chemical and Environmental Engineering Wuhan Polytechnic UniversityWuhan 430023China

Electrocatalytic nitrate reduction to ammonia(NO3−RR)for removing nitrate from wastewater is a promising but challengeable technology that is increasingly ***,we developed an efficient CuO_(x)and CoCuO_(x)composed hybrid catalyst(CoCuO_(x)@CuO_(x)/copper foam(CF)),characteristic of distinctive shell-core nanowires grown on CF substrate with CuO_(x)core and CoCuO_(x)*** built-in electric field formed at the interface of the CoO/Cu_(2)O heterostructure promotes NO3−adsorption by modulating the charge distribution at the interface,which greatly improves the ammonia yield rate and Faradaic ***−0.2 V *** hydrogen electrode(RHE),CoCuO_(x)@CuO_(x)/CF achieves not only an excellent ammonia yield rate of up to 519.1μg·h^(−1)·cm^(−2)and Faradaic efficiency of 99.83%at 1 mM NO3−concentration,but also excellent mechanical *** study provides a novel pathway to design electrocatalyst for the removal of nitrate from dilute nitric acid solutions(≤2 mM).

关键词： CoCuO_(x)@CuO_(x)/copper foam(CF) shell-core nanowires heterostructure low concentration nitrate electroreduction to ammonia

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电催化析氢、析氧及氧还原的研究进展

中国科学：化学 2018年第8期48卷 926-940页

作者：郭亚肖商昌帅李敬汪尔康中国科学院长春应用化学研究所电分析国家重点实验室长春130022 中国科学院大学北京100049

能源短缺和环境污染问题是21世纪以来人类社会发展所面临的两大难题.因此寻找洁净可再生能源及开发高效的能量储存和转换技术是当务之急.电催化反应是多种能量转换器件的核心,可控制备廉价、高效、耐用、绿色环保的催化剂是推动能源存... 详细信息

能源短缺和环境污染问题是21世纪以来人类社会发展所面临的两大难题.因此寻找洁净可再生能源及开发高效的能量储存和转换技术是当务之急.电催化反应是多种能量转换器件的核心,可控制备廉价、高效、耐用、绿色环保的催化剂是推动能源存储和转换技术快速发展的重要途径.本文对电催化过程中三个重要反应的机理进行了概述,包括电催化析氢反应(HER)、电催化析氧反应(OER)及氧还原反应(ORR),并主要对长春应用化学研究所在电催化方向的研究进展进行了总结评述.

关键词：电催化析氢反应(HER) 析氧反应(OER) 氧还原反应(ORR)

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***猜想的注记

纯粹数学与应用数学 2015年第1期31卷 65-72页

作者：郭亚晓杨将西北大学数学学院陕西西安710127

通过类比自治动力系统中拓扑熵指数收敛的定义,给出了非自治拓扑熵指数收敛的定义及非自治Lipschitz系统中***猜想成立的充分条件与必要条件,推广了自治动力系统中的相关结论.

关键词：非自治动力系统拓扑熵熵维数 Lipschitz系统

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非自治动力系统拓扑压变分原理的一点注记

纯粹数学与应用数学 2015年第1期31卷 36-42页

作者：杨将郭亚晓西北大学数学学院陕西西安710127

用类似于非自治熵的变分原理的方法,证明了非自治拓扑压的变分原理的一个不等式,推广了非自治熵的变分原理,丰富了非自治变分原理的内容.

关键词：非自治熵非自治拓扑压变分原理

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非自治逆紧系统的拓扑压

纯粹数学与应用数学 2015年第4期31卷 373-379页

作者：张秀芬郭亚晓杨宇西北大学数学学院陕西西安710127

主要研究了非自治逆紧系统上的拓扑压.给出了非自治逆紧系统上拓扑压的定义,得到了这种拓扑压关于集合Z的一些性质,并在同胚意义下,探讨了两个非自治逆紧系统上拓扑压的大小关系.

关键词： C-P结构容许覆盖非自治逆紧系统拓扑压

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具有潜伏期的寨卡传染病模型的稳定性分析

河北师范大学学报（自然科学版） 2017年第1期41卷 5-10页

作者：邢伟颜七笙杨志辉郭亚晓东华理工大学理学院江西南昌330013

研究了一类具有潜伏期的寨卡传染病模型,模型中包括了常数输入率、死亡率.定义了基本再生数R_0,利用Lyapunov函数和LaSalle不变集原理证明了当R_01时,系统存在地方疾病平衡点,并通过其对应的Jacobian矩阵的特征值符号证明了该平衡点是... 详细信息

研究了一类具有潜伏期的寨卡传染病模型,模型中包括了常数输入率、死亡率.定义了基本再生数R_0,利用Lyapunov函数和LaSalle不变集原理证明了当R_01时,系统存在地方疾病平衡点,并通过其对应的Jacobian矩阵的特征值符号证明了该平衡点是局部渐近稳定的.

关键词：潜伏期寨卡传染病基本再生素渐近稳定

On the accurate characterization of quantum-dot light-emitting diodes for display applications

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npj Flexible Electronics 2022年第1期6卷 351-362页

作者： Wangxiao Jin Yunzhou Deng Bingbing guo yaxiao Lian Baodan Zhao Dawei Di Xiaowei Sun Kai Wang Shuming Chen Yixing Yang Weiran Cao Song Chen Wenyu Ji Xuyong Yang Yuan Gao Shuangpeng Wang Huaibin Shen Jialong Zhao Lei Qian Fushan Li Yizheng Jin Key Laboratory of Excited-State Materials of Zhejiang Province State Key Laboratory of Silicon MaterialsDepartment of ChemistryZhejiang University310027 HangzhouChina State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang University310027 HangzhouChina Department of Electronic and Electrical Engineering Southern University of Science and Technology518055 ShenzhenChina TCL Research ShenzhenGuangdongChina Shenzhen China Star Optoelectronics Semiconductor Display Technology Co. LtdShenzhenGuangdongChina College of Chemistry Chemical Engineering and Materials ScienceSoochow University199 Ren’ai Rd215123 SuzhouJiangsuChina Key Lab of Physics and Technology for Advanced Batteries(Ministry of Education) College of PhysicsJilin University130023 ChangchunChina Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai University149 Yanchang RoadShanghai 200072China Najing Technology Corporation Ltd Hangzhou 310052China Institute of Applied Physics and Materials Engineering University of MacaoTaipaMacaoSAR 999078China Key Laboratory for Special Functional Materials of Ministry of Education National&Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technologyand Collaborative Innovation Center of Nano Functional Materials and ApplicationsHenan UniversityKaifeng 475004China School of Physical Science and Technology MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and MaterialsGuangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanning 530004China Division of Functional Materials and Nanodevices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China College of Physics and Information Engineering Fuzhou UniversityFuzhou 350108China

Quantum dot light-emitting diodes(QLEDs)are a class of high-performance solution-processed electroluminescent(EL)devices highly attractive for next-generation display *** the encouraging advances in the mechanism investigation,material chemistry,and device engineering of QLEDs,the lack of standard protocols for the characterization of QLEDs may cause inaccurate measurements of device parameters and invalid comparison of different ***,we report a comprehensive study on the characterizations of QLEDs using various *** show that the emission non-uniformity across the active area,nonLambertian angular distributions of EL intensity,and discrepancies in the adopted spectral luminous efficiency functions could introduce significant errors in the device *** errors in the operational-lifetime measurements may arise from the inaccurate determination of the initial luminance and inconsistent methods for analyzing the luminance-decay ***,we suggest a set of recommended practices and a checklist for device characterizations,aiming to help the researchers in the QLED field to achieve accurate and reliable measurements.

关键词： diodes characterization luminous

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浅海孤立子内波作用下的三维声场空间特性

声学学报 2024年第4期49卷 855-867页

作者：宋扬莫亚枭郭仕栋冯嘉宝郑广赢哈尔滨工程大学水声技术全国重点实验室哈尔滨150001 工业和信息化部海洋信息获取与安全工信部重点实验室(哈尔滨工程大学) 哈尔滨150001 哈尔滨工程大学水声工程学院哈尔滨150001 中国科学院水声环境特性重点实验室(声学研究所) 北京100190 中国电子科技集团公司第三研究所北京100015 汉江国家实验室武汉430000 声呐技术重点实验室杭州310023

针对浅海环境下孤立子内波对声场空间特性的影响,以三维抛物方程理论及高精度根式算子近似方法为基础,建立了适应孤立子内波环境的三维声场计算方法。充分考虑孤立子内波传播特点与浅海中点源柱扩散形式的声场结构特征,形成以直角坐标系... 详细信息

针对浅海环境下孤立子内波对声场空间特性的影响,以三维抛物方程理论及高精度根式算子近似方法为基础,建立了适应孤立子内波环境的三维声场计算方法。充分考虑孤立子内波传播特点与浅海中点源柱扩散形式的声场结构特征,形成以直角坐标系−柱坐标系的联合环境处理的声场计算形式,通过改变环境参数输入形式,提升了计算效率,并研究了孤立子内波影响下的三维声场分布特性。结果表明,平坦海底情况下,内波影响下的三维声场垂直和水平分布结构均发生变化,且随频率增加而增大,尤其是声源深度在跃层附近时变化更为明显;非平坦海底环境下,三维声场受到非水平海底和内波的双重调制作用,导致孤立子内波影响下的声场水平分布变化进一步加剧,从而在一定程度上反映出海底地形这一大尺度非均匀性对声场产生的水平折射效应以及对声传播特性的影响。

关键词：孤立子内波三维声场非水平海底空间特性抛物方程