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Bifunctional Fe-doped CoP@Ni_(2)P heteroarchitectures for highefficient water electrocatalysis

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Nano Research 2022年第10期15卷 8865-8871页

作者： Zhongxin Duan depeng zhao Yuchen Sun Xiaojie Tan Xiang Wu School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

It is important to develop economical and durable electrocatalysts for sustainable energy conversion ***,the current catalysts still suffer from insufficient hydrogen adsorption ***,we report a kind of novel bi-phosphide catalyst through constructing heterogeneous structures and cation *** obtained sample delivers an outstanding hydrogen evolution reaction(HER)performance at all pH *** oxygen evolution reaction(OER)electrocatalyst,Fe-CoP@Ni_(2)P samples show an overpotential of 237 mV at 50 mA·cm^(−2) in alkaline *** electrolysis of water,Fe-CoP@Ni_(2)P catalysts deliver a cell voltage of 1.59 V at 50 mA·cm^(−2) and long ***,density functional theory(DFT)calculation further confirms that the doped heterostructure promotes Gibbs free energy for hydrogen *** the significant increase in the density of total states(DOS)also enhances the catalytic activity of HER.

关键词： Fe doping phosphide heterostructure all pH range hydrogen evolution reaction(HER) electrolysis

Emerging CoMn-LDH@MnO2 electrode materials assembled using nanosheets for flexible and foldable energy storage devices

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Journal of Energy Chemistry 2020年第6期29卷 67-73,I0003页

作者： Yue zhao Jiafeng He Meizhen Dai depeng zhao Xiang Wu Baodan Liu School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870LiaoningChina Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina

CoMn layered double hydroxides(CoMn-LDH)are promising electrode materials for supercapacitors because of their excellent cyclic ***,they possess relatively low *** this work,hybrid CoMn-LDH@MnO2 products grown on Ni foams were obtained through a facile hydrothermal *** as-synthesized samples employed as electrodes deliver a specific capacitance of 2325.01 F g^-1 at 1 A g^-*** assembled asymmetric supercapacitor using these products as positive electrodes shows a maximum energy density of 59.73 W h kg^-1 at 1000.09 W kg^-*** prominent electrochemical performance of the as-prepared electrodes could be attributes to hierarchical *** findings suggest that hybrid structures might be potential alternatives for future flexible energy storage devices.

关键词： CoMn-LDH@MnO2 electrode Specific capacitance Flexible device Cyclic stability

Ternary core-shell structured transition metal chalcogenide for hybrid electrochemical capacitor

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Chinese Chemical Letters 2018年第12期29卷 1799-1803页

作者： Hengqi Liu depeng zhao Pengfei Hu Xiang Wu School of Materials Science and Engineering Shenyang University of Technology

Hybrid structured semiconductor nanomaterials possess excellent electrochemical performances owing to the synergistic effects from two components. Herein we report a novel CoMo;S;@Zn-Co-S core-shell structure as the electrode materials for asymmetric supercapacitor. The unique electrode structure is beneficial to rapid electron transport and the ion diffusion due to the existence of many vast *** as-synthesized core-shell structured electrode exhibits an overall improved electrochemical performance. Moreover, a quasi-solid state asymmetric supercapacitor is fabricated. It reveals a specific capacitance of 0.84 C/cm;collected at 4mA/cm;and an energy density of 1.87 mWh/cm;at a power density of 31.99 W/cm;.

关键词： CoMo_2S_4@Zn-Co-S Core-shell structure Supercapacitor Specific capacitance High energy density

Bifunctional ZnCo_(2)S_(4)/CoZn_(13) hybrid electrocatalysts for high efficient overall water splitting

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Journal of Energy Chemistry 2022年第6期31卷 292-300,I0009页

作者： depeng zhao Meizhen Dai Hengqi Liu Zhongxin Duan Xiaojie Tan Xiang Wu School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870LiaoningChina Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074HubeiChina

To develop highly active and low-cost electrocatalyst is very important to improve the efficiency of water ***,the current catalysts still present serious challenges due to the poor intrinsic activity and high ***,we report several amino induced Co-based composite *** a structure-mediating agent,ethylenediamine (EDA) can not only regulate the crystal structure and but also provide many surface amino *** obtained ZnCo_(2)S_(4)/CoZn_(13) catalysts show an excellent oxygen evolution reaction (OER) performance (274 mV@50 mA cm^(-2)) and the overpotential of 160 mV at-10 mA cm^(-2) for hydrogen evolution reaction (HER).For electrolysis of water,the electrocatalysts deliver a cell voltage of 1.61 V at 50 m A cm^(-2).This study provides a facile synthetic strategy to construct advanced electrocatalysts for future applications.

关键词： Electrocatalysts Hybrid structure Alloys Water splitting Durability

High performance hybrid supercapacitor based on hierarchical MoS2/Ni3S2 metal chalcogenide

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Chinese Chemical Letters 2019年第5期30卷 1105-1110页

作者： Ying Liu depeng zhao Hengqi Liu Ahmad Umar Xiang Wu School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China Department of Chemistry Faculty of Science and Arts and Promising Centre for Sensors and Electronic Devices(PCSED)Najran UniversityNajran 11001Saudi Arabia

Recently,because of excellent electrical conductivities and many active sites,transition metal sulfides have been utilized as efficient electrodes for ***,we synthesize hierarchical MoS2/Ni3S2 structures grown on nickel foam by a facile one-pot hydrothermal *** as-fabricated asymmetric hybrid capacitor based on hierarchical MoS2/Ni3S2 electrode exhibit a specific capacitance of^1.033 C/cm2 at1 mA/***,the hybrid capacitor unveils an energy density of 35.93 m W h/cm3 at a power density of 1064.76 mW/*** observed results clearly revealed that the synthesized MoS2/Ni3S2 structure might be used as potential electrode material for future energy storage devices.

关键词： MoS2/Ni3S2 3D hierarchical structures Hybrid supercapacitor Energy storage device Cycle stability

Na2V6O16·2.14H2O nanobelts as a stable cathode for aqueous zinc-ion batteries with long-term cycling performance

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Journal of Energy Chemistry 2019年第11期28卷 185-191页

作者： Fang Hu Di Xie depeng zhao Guihong Song Kai Zhu School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870LiaoningChina Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150010HeilongjiangChina

Aqueous zinc-ion batteries(ZIBs) have been considered as one of the most promising electrochemical devices for large-scale energy storage system owing to their low cost and high safety. Herein, Na2V6O16·2.14H2O nanobelts are synthesized and applied as cathode material for ZIBs. The sample displays a high capacity of 466 m Ahg^-1 at 100 mAg^-1 and stable cycling performance with a capacity retention of 90% over 20 0 0 cycles at the 20 Ag^-1. Moreover, Na2V6O16·2.14H2O presents a capable rate ability and a high energy density of 312 Wh kg^-1 at a specific power of 70 Wkg^-1. The superior electrochemical performance is attributed to the large interlayer spacing and outstanding structure stability, which promise the highly reversible intercalation and extraction of zinc ion. The electrochemical kinetics and zinc ion storage mechanism are also investigated. This work demonstrates that nanoscale electrode materials with large interlayer spacing can effectively enhance the electrochemical performance of aqueous ZIBs, which can be extended to other metal ion batteries, such as magnesium ion batteries and aluminum ion batteries.

关键词： Aqueous zinc-ion batteries Nanobelts Sodium vanadates Electrochemical performance

NiMoCo layered double hydroxides for electrocatalyst and supercapacitor electrode

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Science China Materials 2021年第3期64卷 581-591页

作者： Hengqi Liu depeng zhao Ying Liu Yongli Tong Xiang Wu Guozhen Shen School of Materials Science and Engineering Shenyang University of TechnologyShenyang110870China State Key Laboratory for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing100083China

Non-noble-metal electrode materials with high durability and efficiency have become the frontiers of energy conversion and storage ***,conventional electrode materials often show high overpotential and low *** solve this problem,we fabricate a NiMoxCo2−x layered double hydroxide(LDH)/Ni foam(NF)product through a facile hydrothermal *** as-prepared NiMo-Co-LDH/NF catalyst possesses an overpotential of 123 mV for hydrogen evolution reaction(HER)at 10 mA cm^−2 and 279 mV for oxygen evolution reaction(OER)at 20 mA cm^−*** as obtained product exhibits excellent overall water splitting ***,as the electrode material for supercapacitor,it delivers high specific capacitance and excellent cyclic *** asymmetric supercapacitor assembled with NiMoCo-LDH/NF//active carbon exhibits 93%of its initial capacity after 8000 cycles.

关键词： layered double hydroxide hydrogen evolution reaction oxygen evolution reaction overall water splitting supercapacitor energy density

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基于隐实体建模模式的分布式约束数据库系统

计算机工程 2005年第17期31卷 87-89页

作者：刘伟赵德鹏王德强大连海事大学航海技术研究所大连116026 大连海事大学数理系大连116026

在传统对象关系数据库中采用扩充基于隐实体建模模式的空间逻辑运算和空间分析运算功能,建立了用于虚拟现实应用的分布式约束数据库系统。隐实体建模模式采用符号表达式方法表达空间物体,提高了数据的表现力,消除了数据冗余,减少了记录... 详细信息

在传统对象关系数据库中采用扩充基于隐实体建模模式的空间逻辑运算和空间分析运算功能,建立了用于虚拟现实应用的分布式约束数据库系统。隐实体建模模式采用符号表达式方法表达空间物体,提高了数据的表现力,消除了数据冗余,减少了记录的数量,处理空间数据的实时性显著增强。采用与关系数据一致的空间数据表达形式可将空间数据与关系数据一同存储,保证了数据的完整性。构造树方式管理隐实体数据使数据库中物体间的空间逻辑关系的表达更清晰,空间分析和运算更简洁。

关键词：隐实体建模约束数据库分布式虚拟环境空间数据库

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基于数据库的多分辨率地形索引结构的研究

计算机工程 2006年第22期32卷 31-33页

作者：刘伟王德强赵德鹏广东工业大学材料与能源学院广州510006 大连海事大学航海学院大连116026

当空间应用进入到网络化后,人们迫切需要利用数据库的约束机制为空间数据提供更好的保护,目前数据库系统只能管理单一分辨率的地形空间数据。该文提出了一种可在关系数据库顶端实现的、支撑动态多分辨率地形与可视化数据调用的关系模型... 详细信息

当空间应用进入到网络化后,人们迫切需要利用数据库的约束机制为空间数据提供更好的保护,目前数据库系统只能管理单一分辨率的地形空间数据。该文提出了一种可在关系数据库顶端实现的、支撑动态多分辨率地形与可视化数据调用的关系模型。该模型解决了在大规模地形可视化程序中,数据库系统客户端/服务器间的数据交换问题,利用了X树索引技术将多分辨率地形映射到关系模型中,利用特征空间将累进查询过程转换为几个简单的一维范围查询的联合,在各表中每个帧分别进行一次索引扫描,即可获得全部必要的数据,使其更好地处理大规模的地形数据。实验结果表明,利用该模型能够获得良好的检索效果。

关键词：多分辨率索引地形可视化关系数据库空间索引