检索结果-南通市图书馆

In-situ structure reconstitution of NiCo2Px for enhanced electrochemical water oxidation

Science Bulletin 2017年第22期62卷 1510-1518页

作者： Xue Bai Zhiyu Ren Shichao Du huiyuan meng Jun Wu Yuzhu Xue Xiaojun Zhao Honggang Fu Tianjin Key Laboratory of Structure and Performance for Functional Molecules Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry Ministry of Education of the People's Republic of China Tianjin Normal University Tianjin 300387 China Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People's Republic of China School of Chemistry and Materials Science Heilongjiang University Harbin 150080 China

Gaining insight into the structure evolution of transition-metal phosphides during anodic oxidation is significant to understand their oxygen evolution reaction(OER) mechanism, and then design highefficiency transition metal-based catalysts. Herein, NiCo_2P_x nanowires(NWs) vertically grown on Ni foam were adopted as the target to explore the in-situ morphology and chemical component reconstitution during the anodic oxidation. The major factors causing the transformation from NiCo_2P_x into the hierarchical NiCo_2P_x@CoNi(OOH)_x NWs are two competing reactions: the dissolution of NiCo_2P_x NWs and the oxidative re-deposition of dissolved Co^(2+) and Ni^(2+) ions, which is based primarily on the anodic bias applied on NiCo2 Px NWs. The well balance of above competing reactions, and local pH on the surface of NiCo_2P_x NW modulated by the anodic oxidation can serve to control the anodic electrodeposition and rearrangement of metal ions on the surface of NiCo_2P_x NWs, and the immediate conversion into CoNi(OOH)_x. Consequently, the regular hexagonal CoNi(OOH)_x nanosheets grew around NiCo_2P_x *** from the active catalytic sites on the surface and the sufficient conductivity, the resultant NiCo_2P_x@CoNi(OOH)_x arrays also display good OER activity, in terms of the fast kinetics process, the high energy conversion efficiency, especially the excellent durability. The strategy of in-situ structure reconstitution by electrochemical reaction described here offers a reliable and valid way to construct the highly active systems for various electrocatalytic applications.

关键词： NiCo2Px Structure reconstitution Anodic oxidation CoNi(OOH)x Oxygen evolution reaction(OER)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Co-vacancy-rich CO1-xS nanosheets anchored on rGO for high-efficiency oxygen evolution

引用

Nano Research 2017年第5期10卷 1819-1831页

作者： Jiaqing Zhu Zhiyu Ren Shichao Du Ying Xie Jun Wu huiyuan meng Yuzhu Xue Honggang Fu Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People's Republic of China School of Chemistry College of Materials Science and Chemical Engineering Harbin Engineering University Harbin 150001 China

Developing cost-efficient electrocatalysts for oxygen evolution is vital for the viability of H2 energy generated via electrolytic water. Engineering favorable defects on the electrocatalysts to provide accessible active sites can boost the sluggish reaction thermodynamics or kinetics. Herein, Col_xS nanosheets were designed and grown on reduced graphene oxide （rGO） by controlling the successive two-step hydrothermal reaction. A belt-like cobalt-based precursor was first formed with the assistance of ammonia and rGO, which were then sulfurized into Col_xS by L-cysteine at a higher hydrothermal temperature. Because of the non-stoichiometric defects and ultrathin sheet-like structure, additional cobalt vacancies （V^o） were formed/exposed on the catalyst surface, which expedited the charge diffusion and increased the electroactive surface in contact with the electrolyte. The resulting Col_xS/rGO hybrids exhibited an overpotential as low as 310 mV at 10 ***-2 in an alkaline electrolyte for the oxygen evolution reaction （OER）. Density functional theory calculations indicated that the Vco on the Col_xS/rGO hybrid functioned as catalytic sites for enhanced OER. They also reduced the energy barrier for the transformation of intermediate oxygenated species, promoting the OER thermodynamics.

关键词： cobalt vacancies (Vco) Co1-xS oxygen evolution reaction electrocatalysis nanosheets

来源：

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

Constructing Pd-N interactions in Pd/g-C_(3)N_(4)to improve the charge dynamics for efficient photocatalytic hydrogen evolution

引用

Nano Research 2022年第4期15卷 2928-2934页

作者： Xudong Xiao Siying Lin Liping Zhang huiyuan meng Jing Zhou Qi Li Jianan Liu Panzhe Qiao Baojiang Jiang Honggang Fu Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of ChinaSchool of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150080China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China School of Safety Engineering Heilongjiang University of Science and TechnologyHarbin 150080China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Chinese Acad Sci Shanghai Synchrotron Radiat FacilShanghai Adv Res InstShanghai 201204China

The formation of chemical bonds between metal ions and their supports is an effective strategy to achieve good catalytic ***,both the synthesis of active metal species on a support and control of their coordination environment are still ***,we show the use of an organic compound to produce tubular carbon nitride(TCN)as a support for Pd nanoparticles(NPs),creating a composite material(NP-Pd-TCN).It was found that Pd ions preferentially bind with the electron-rich N atoms of TCN,leading to strong metal-support interactions that benefit charge transfer from g-C_(3)N_(4)to Pd.X-ray absorption spectroscopy further revealed that the metal-support interactions resulted in the formation of Pd-N bonds,which are responsible for the improvement in the charge dynamics as evidenced by the results from various techniques including photoluminescence(PL)spectroscopy,photocurrent measurements,and electrochemical impedance spectroscopy(EIS).Owing to the good dynamical properties,NP-Pd-TCN was used for photocatalytic hydrogen evolution under visible-light irradiation(λ>420 nm)and an excellent evolution rate of~381μmol·h^(-1)(0.02 g of the photocatalyst)was *** work aims to promote a strategy to synthesize efficient photocatalysts for hydrogen production by controllably introducing metal nanoparticles on a support and in the meantime forming chemical bonds to achieve intimate metal-support contact.

关键词： carbon nitride charge transfer dynamics photocatalysis hydrogen evolution reaction

来源：

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

Engineering of SnO_(2)/TiO_(2) heterojunction compact interface with efficient charge transfer pathway for photocatalytic hydrogen evolution

引用

Chinese Chemical Letters 2023年第1期34卷 483-486页

作者： Hongli Wang Jianan Liu Xudong Xiao huiyuan meng Jie Wu Chuanyu Guo Mang Zheng Xiaolei Wang Shien Guo Baojiang Jiang Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of ChinaSchool of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150000China School of Safety Engineering Heilongjiang University of Science and TechnologyHarbin 150022China Institute of Advanced Materials(IAM) College of Chemistry and Chemical EngineeringJiangxi Normal UniversityNanchang 330022China

Fabricating an efficient charge transfer pathway at the compact interface between two kinds of semiconductors is an important strategy for designing hydrogen production heterojunction *** this work,we prepared a compact,stable and oxygen vacancy-rich photocatalyst(SnO_(2)/TiO_(2) heterostructure)via a simple and reasonable in-situ synthesis ***,SnCl_(2)–2H_(2)O is hydrolyzed on the TiO_(2) *** the pyrolysis process,SnO_(2) nanoparticles(5 nm)were dispersed on the surface of ultrathin TiO_(2) nanosheets ***,the heterojunction system can offer abundant oxygen vacancies,which can act as active sites for catalytic ***,the interfacial contact of SnO_(2)/TiO_(2) grading semiconductor oxide is uniform and tight,which can promote the separation and migration of photogenerated *** shown in the experimental results,the hydrogen production rate of SnO_(2)/TiO_(2) is 16.7 mmol h^(-1)g^(-1)(4.4 times higher than that of TiO_(2)),which is owing to its good dynamical *** work demonstrates an efficient strategy of tight combining SnO_(2)/TiO_(2) with abundant oxygen vacancies to improve catalytic efficiency.

关键词： Photocatalysis SnO_(2)-TiO_(2)heterojunction Solvent thermal Charge transfer Hydrogen evolution

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于TLP系泊振荡浮子波能发电装置锚固性能研究

引用

太阳能学报 2018年第3期39卷 659-664页

作者：史宏达田会元孟珣中国海洋大学工程学院青岛266100 中国海洋大学山东省海洋工程重点实验室青岛266100 青岛市海洋可再生能源重点实验室青岛266100 中澳海洋工程联合研究中心青岛266100

介绍锚固基础由潜浮体和张力筋腱组成的振荡浮子波能发电装置及10kW海试样机。采用AQWA软件分析液压阻尼对装置的影响；运用TOPSIS评估方法探寻潜浮体的最优布置位置。研究表明：综合考虑装置位移响应、锚链张力和质量因素，潜浮体位置... 详细信息

介绍锚固基础由潜浮体和张力筋腱组成的振荡浮子波能发电装置及10kW海试样机。采用AQWA软件分析液压阻尼对装置的影响；运用TOPSIS评估方法探寻潜浮体的最优布置位置。研究表明：综合考虑装置位移响应、锚链张力和质量因素，潜浮体位置存在最优解.

关键词：振荡浮子波浪发电装置潜浮体张力筋键液压阻尼 TOPSIS

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

铝制板翅式换热器在氦低温过冷系统中的应用

引用

河南科技 2018年第2期37卷 79-81页

作者：翁小列梁成坡张惠媛运萌开封空分集团有限公司河南开封475000

随着低温、超导技术的不断发展,低温与超导技术在核聚变实验装置、超导储能电站、航空航天的应用越来越广泛,对低温制冷设备的需求也越来越多,铝制板翅式换热在低温过冷系统中也得到应用。本文介绍了铝制板翅式换热器在核低温过冷系统... 详细信息

随着低温、超导技术的不断发展,低温与超导技术在核聚变实验装置、超导储能电站、航空航天的应用越来越广泛,对低温制冷设备的需求也越来越多,铝制板翅式换热在低温过冷系统中也得到应用。本文介绍了铝制板翅式换热器在核低温过冷系统中的应用与设计,为研究与发展大型超临界氦和过冷氦低温制冷工程设计及运行模式的优化打下了基础。

关键词：氦低温过冷系统铝制板翅式换热器 MUSE软件

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

集约化露天菜地表层土壤盐分累积特征及消长规律

引用

生态环境 2008年第4期17卷 1624-1629页

作者：王金辉柳勇蒙辉远李广豪徐润生吕业成胡承孝李淑仪梁李宏中国热带农业科学院热带作物品种资源研究所广东省生态环境与土壤研究所//广东省农业环境综合治理重点实验室广东广州510650 华中农业大学资源与环境学院湖北武汉430070 广东省生态环境与土壤研究所//广东省农业环境综合治理重点实验室浙江大学环境与资源学院//土水资源与环境研究所浙江杭州310029 佛山市南海区农林技术推广中心华中农业大学资源与环境学院

以广东省佛山市南海区为例，研究了集约化露天菜地表层土壤盐分的累积状况和离子组成，对盐分的季节性消长规律及其变化原因进行了深入分析。结果表明：2006年春季土壤盐分的累积情况较为严重，5个集约化露天菜地样点中有3个样点（1、2... 详细信息

以广东省佛山市南海区为例，研究了集约化露天菜地表层土壤盐分的累积状况和离子组成，对盐分的季节性消长规律及其变化原因进行了深入分析。结果表明：2006年春季土壤盐分的累积情况较为严重，5个集约化露天菜地样点中有3个样点（1、2、4号）的表层土壤盐分浓度较高，全盐质量分数超过1．0g·kg^-1，已达到次生盐渍化的标准，其中又以2号样点（菜场）最为突出，全盐质量分数高至2．42g·kg^-1；2006年容季到夏季为脱盐阶段，土壤盐分浓度下降明显；2006年夏季到秋冬季变化幅度不大。土壤盐分浓度的变化与降雨量有密切关系，虽然2006年降雨偏多，但佛山市南海区农业集约化水平较高，部分菜地连年种植蔬菜、复种指数极高、化肥施用量偏大，从而在遇到干旱年份和季节，集约化露天菜地土壤仍有发生次生盐渍化的风险。土壤盐分的离子组成上，阳离子以Ca^2＋为主，占全盐质量分数的11．0％～24．1％；阴离子以NO3^-和SO4^2-为主，分别占全盐质量分数的8．9％～31．0％和10．9％～45．7％。研究结果可为控制土壤盐分累积、提高蔬菜生产能力及品质、保护和合理利用耕地资源，提供参考资料。

关键词：露天菜地土壤盐分累积季节性变化

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Organic-Inorganic Interaction Recorded by Polycyclic Aromatic Steranes in Continental Epithermal Ore Deposits

引用

Acta Geologica Sinica(English Edition) 2023年第1期97卷 327-336页

作者： XU huiyuan LIU Quanyou JIN Zhijun ZHU Dongya meng Qingqiang LI Pengpeng ZHU Biqing State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing 100083China Petroleum Exploration&Production Research Institute SINOPECBeijing 100083China Institute of Energy School of Earth cand Space SciencesPeking UniversityBeijing 100871China

Continental epithermal ore deposits are commonly associated with sedimentary organic matter,oils or solid *** organics embedded in mineral deposits can convey valuable information of the ore ***,the extent to which the formation of ore minerals was recorded by organic compounds remains largely unknown,as also is how metal-rich ores interfere with the molecular proxies in the temperature regime envisaged for hydrothermal *** molecular compositional changes of various polycyclic aromatic steranes and polycyclic aromatic hydrocarbons and compounds derived from the Jinding Pb/Zn deposit,SW China provide new *** regular steranes are present as *** transformation from polycyclic aromatic steranes to unsubstituted polycyclic aromatic hydrocarbons is observed to show an increased trend with increasing hydrothermal alteration levels;this is consistent with the transformation from unsubstituted polycyclic aromatic hydrocarbons to heterocyclic ***(aromatization)of polycyclic biological compounds and hydrodecyclization(dearomatization)of polycyclic aromatic compounds are two important reaction pathways in hydrothermal systems with moderate *** detailed investigation of organicinorganic interactions of two groups of polycyclic compounds with metal-rich ores provides insights into the questions on how and to what extent the formation of Pb/Zn deposits can be recorded by *** work will improve our understanding of carbon reduction,oxidation or condensation in the deep Earth and the carbon exchange between the Earth's crust and mantle,and may shed light on the processes for ultra-deep hydrocarbon exploration.

关键词： petroleum resources organic-inorganic interaction biomarker polycyclic compounds hydrothermal environment

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Break Down of Vertical-Bloch-Line Chains in the First Kind of Dumbbell Domain Walls Subjected to an in-Plane Field

引用

Chinese Physics Letters 1995年第8期12卷 489-492页

作者： GUO Gexin LU Wei SUN huiyuan NIE Xiangfu meng Guangqing HAN Baoshan Department of Physics Hebei Teachers UniversityShijiazhuang 050016 Department of Physics Hebei Teachers InstituteShijiazhuang 050091 State Key Laboratory for Magnetism Institute of PhysicsAcademia SinicaBeijing 100080

Experiments were statistically carried out on the behavior of the vertical-Bloch-line(VBL)chains of the first kind of dumbbell domains(IDs)in garnet bubble films subjected to an in-plane field,*** was found that for IDs the critical in-plane field,(Hip)ID,above which their VBL chains disappear,is the same as that of ordinary hard bubbles(OHBs),H'***,for IDS,the critical range of Hip for VBL chain softening is larger than that of ***,we also found some details of the softening process,e.g.,the collapse field range of the remaining IDs shrinks rapidly towards H_(0,mas),and this very narrow range can maintain until all IDs are softened.

关键词： chains Bloch details

来源：

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

Diamondoids in petroleum: a review of sources and thermal evolution

引用

Journal of Earth Science 2024年

作者： Biqing Zhu Quanyou Liu huiyuan Xu Dongya Zhu Qingqiang meng Jingbin Wang Institute of Energy， Peking University Petroleum Exploration and Production Research Institute SINOPEC

Cage structural diamondoids serve as highly stable molecular indicators， extensively employed in delineating the hydrocarbon sources， particularly in light oils and condensates found in ultra-deep reservoirs. A systematic summary of thermal pyrolysis experiments suggested that the thermal evolution of diamondoids in petroleum consists of four distinct stages: (1) birth， (2) growth and enrichment， (3) decrease and decomposition， and (4) complete decomposition. The diamondoids are mainly sourced from the thermal cracking of oil during the late catagenesis to metagenesis， followed by kerogen maturation during catagenesis. Considering the diamondoid decomposition for the first time， we propose an evolution model of diamondoids during hydrocarbon generation in actual reservoirs， which is much more significant in revealing the primary sources and secondary processes (e.g.， evaporation fractionation) of ultra-deep hydrocarbons. In addition， this model enables us to determine the baseline and predict the ‘dead line’ for preserving liquid hydrocarbons in ultra-deep reservoirs. However， the transformation mechanisms between diamondoids and other molecular markers in deep basins need to be further investigated.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：