检索结果-南通市图书馆

Pt-Co single atom alloy catalysts: Accelerated water dissociation and hydrogen evolution by strain regulation

Journal of Energy Chemistry 2022年第6期31卷 44-53,I0002页

作者： Rendian Wan Mi Luo Jingbo Wen Shilong Liu Xiongwu Kang Yong Tian School of Pharmacy Guangdong Pharmaceutical UniversityGuangzhou 510006GuangdongChina New Energy Research Institute School of Environment and EnergySouth China University of TechnologyHigher Education Mega CenterGuangzhou 510006GuangdongChina

The alkaline hydrogen evolution reaction(HER) on Pt-based catalysts is largely limited by the slow water dissociation kinetics. Pt-based single atom alloy catalysts(SAAC) with water dissociation sites have been demonstrated as excellent alkaline HER catalysts. However, the regulation of their activity and stability at the atomic scale is still a great challenge. Herein, the kinetic and stability issues are successfully resolved via engineering the electronic structure of Pt-Co SAAC by Au-induced tensile strain. The atomic dispersion of Co into the Pt shell was confirmed by extended X-ray absorption fine structure and the electronic structure and catalytic HER performance was modulated by the tensile strain induced by the Pt shell thickness. An inverse volcano-type relation between HER activity and surface strain was found.density functional theory(dFT) calculations reveal that the Au-induced tensile strain on Pt-Co shell can not only boost the adsorption and dissociation kinetics of water at Co site by upshifting the dband and promoting the electron transfer, but also downshift the d-band center of Pt in Pt-Co shell, leading to optimized H* adsorption/desorption. The champion catalyst provides an overpotential of only 14 m V at the current density of 10 mA cm^(-2). This work not only provides an effective strategy for the construction of single-atom alloy electrocatalysts for high performance toward alkaline HER but also sheds light on the understanding of the reaction mechanism at the atomic level.

关键词： Hydrogen evolution reaction Single atom alloy Strain dFT calculation d-band

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

单壁碳纳米管SERS光谱中d-band劈裂现象的研究

单壁碳纳米管SERS光谱中D-band劈裂现象的研究

引用

第十四届全国分子光谱学术会议

作者：于世丹于淼刘冰冰王霖姚明光侯元元邹广田王旭赵冰吉林大学超硬材料国家重点实验室吉林大学超硬材料国家重点实验室吉林大学超硬材料国家重点实验室吉林大学超硬材料国家重点实验室吉林大学超硬材料国家重点实验室吉林大学超硬材料国家重点实验室吉林大学超硬材料国家重点实验室吉林大学超分子结构与材料教育部重点实验室吉林大学超分子结构与材料教育部重点实验室

文章研究了单壁碳纳米管在不同材质基片上的表面增强拉曼光谱,活性金属膜为平均粒径40 nm 的银膜,基片材质分别为在白宝石、石英。作者发现在表面增强拉曼光谱中,碳管的d-band明显劈裂为两个小峰,并且随着激发光功率的增加,位于高频部... 详细信息

文章研究了单壁碳纳米管在不同材质基片上的表面增强拉曼光谱,活性金属膜为平均粒径40 nm 的银膜,基片材质分别为在白宝石、石英。作者发现在表面增强拉曼光谱中,碳管的d-band明显劈裂为两个小峰,并且随着激发光功率的增加,位于高频部分的小峰消失,位于低频部分的小峰没有明显的变化。我们对两个小峰的可能归属进行了指认,探讨了不同类型的缺陷对碳管d-band的贡献。

关键词：表面增强拉曼散射单壁碳纳米管 d-band

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

Recent advances of two-dimensional CoFe layered-double-hydroxides for electrocatalytic water oxidation

引用

Chinese Chemical Letters 2022年第6期33卷 2845-2855页

作者： Yi Zhou Jialai Hu Lichun Yang Qingsheng Gao College of Chemistry and Materials Science and Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and ApplicationsJinan UniversityGuangzhou 510632China School of Materials Science and Engineering and Guangdong Provincial Key Laboratory of Advanced Energy Storage MaterialsSouth China University of TechnologyGuangzhou 510640China Ningbo Fengcheng Advanced Energy Materials Research Institute Co. Ltd.Ningbo 315000China

Oxygen evolution reaction(OER)is pivotal to drive green hydrogen generation from water electrolysis,but yet is strictly overshadowed by the sluggish reaction kinetics.Earth-abundant and cut-price transitionmetal compounds,particularly Co Fe layered-double-hydroxides(LdHs),show the distinct superiorities in contrast to noble metals and their derivatives.In this review,we firstly underline their fundamental issues in electrocatalytic water oxidation,including Co Fe LdHs crystal structure,the surface of(hydr)oxides confined to OER and the controversial roles of Fe species,aiming at understanding the structure-related activity and catalytic mechanism.Advanced approaches for optimizing OER activity of Co Fe LdHs are then comprehensively overviewed,which will shed light on the different working mechanisms and provide a concise analysis of their unique advantages.Finally,a perspective on the future development of Co Fe LdHs electrocatalysts is offered.We hope this review can give a concise and explicit guidance for the development of transition-metal-based electrocatalysts in the energy field.

关键词： CoFe layered-double-hydroxides Electrocatalytic water oxidation Two-dimensional nanostructures Surface reconstruction d-band

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

Towards a molecular understanding of the electronic metal-support interaction(EMSI)in heterogeneous catalysis

引用

Green Energy & Environment 2023年第3期8卷 619-625页

作者： Keng Sang Ji Zuo Xiangxue Zhang Qianhong Wang Wenyao Chen Gang Qian Xuezhi duan State Key Laboratory of Chemical Engineering East China University of Science and Technology130 Meilong RoadShanghai200237China

Tailoring the electronic metal-support interaction(EMSI)has attracted considerable interests as one of the most efficient approaches to improve both the activity and stability of metal catalysts in heterogeneous catalysis.In this viewpoint,we illustrate the methodology and relevant fundamentals on the disentanglement,characterization,and interpretation of EMSI.Under the choice of monometallic catalyst over inert support,a combination of optimal experiment design,multimodal techniques,in situ characterization,with a comprehensive understanding of the underlying measurement protocols is highly desirable for a reliable determination of EMSI.Accordingly,not only the d-band filling but also d-band energy within the EMSI should be taken into consideration for providing general principles to guide the electron-promoting catalytic reaction.

关键词： EMSI disentanglement Characterization Interpretation d-band

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

A 143.2–168.8-GHz signal source with 5.6 dBm peak output power in a 130-nm SiGe BiCMOS process

引用

Science China(Information Sciences) 2020年第12期63卷 275-277页

作者： Peigen ZHOU Jixin CHEN Pinpin YAN Zhigang PENG debin HOU Zhe CHEN Wei HONG State Key Laboratory of Millimeter Waves Southeast University

dear editor,With the development of silicon-based processes,a variety of RF devices have become possible to be designed at frequencies above 100 GHz [1]. Besides, sub-terahertz systems operating in d-band have the potential to be applied to a wide range of applications, such as high-resolution radar, energy detection, and broadband ultra high-speed communication [2].

关键词： Broadband d-band Frequency doubler SiGe BiCMOS Signal Source Terahertz VCO

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

Highly active zigzag-like Pt-Zn alloy nanowires with high-index facets for alcohol electrooxidation

引用

Nano Research 2019年第5期12卷 1173-1179页

作者： Yanchao Xu Xiaoqiang Cui Shuting Wei Qinghua Zhang Lin Gu Fanqi Meng Jinchang Fan Weitao Zheng State Key Laboratory of Automotive Simulation and Control School of Materials Science and EngineeringKey Laboratory of Automobile Materials of MOE and Jilin UniversityChangchun 130012China Laboratory of Advanced Materials and Electron Microscopy Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China

The development of highly efficient Pt-based alloy nanocatalysts is important but remains challenging for fuel cells commercialization.Here,a new class of zigzag-like platinum-zinc (Pt-Zn) alloy nanowires (NWs) with rough surface and controllable composition is reported.The merits of anisotropic one-dimensional nanostructure,stable high-index facets and coordinatively unsaturated Pt sites endow the composition-optimal Pt94Zn6 NWs with a mass activity of 7.2 and 6.2 times higher than that of commercial Pt black catalysts toward methanol/ethanol oxidation,respectively.Alloying-induced d-band electron modulation and lattice strain effects weaken the adsorption strength of poisoning species,which originally enhances the catalytic activity of Pt-Zn NWs.This study provides a new perspective of Pt-Zn electrocatalysts with intrinsic mechanism for enhanced catalytic performance.

关键词： Pt-Zn nanowires zigzag-like high-index facets d-band center strain effects alcohol oxidation

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

The relationship between formate adsorption energy and electronic properties: A first principles density functional theory study

引用

Science China Chemistry 2009年第9期52卷 1427-1433页

作者： MORIKAWA Yoshitada NAKAMURA Junji The Institute of Scientific and Industrial Research (ISIR) Osaka University Research Institute for Computational Sciences (RICS) National Institute of Advanced Industrial Science and Technology (AIST) Institute of Materials Science University of Tsukuba

First principles density functional theory calculations have been performed for the chemisorption of formate adsorption on some metal surfaces. For the most stable adsorption site of short-bridge, the calculated formate adsorption energy follows the order of Au(110) d(110) d a clear linear correlation exists between the adsorption energy and the corresponding heat of formation of metal oxides. Moreover, it has been found that the formate adsorption energy for the transition metals can be correlated well with its d-band center (εd), and the IB Group metals can be described by the coupling matrix element square (Vad2).

关键词： formate metal dFT-GGA slab model adsorption energy d-band center

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

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

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

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：