Noble-Metal Nanocrystals in Metastable Phases

亚稳态贵金属纳米晶体

基本信息

批准号：
2105602
负责人：
Younan Xia
金额：
$ 45万
依托单位：
Georgia Tech Research Corporation
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2022
资助国家：
美国
起止时间：
2022-01-01 至 2024-12-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2105602&HistoricalAwards=false
关键词：
Noble Metal Nanocrystals Metastable Phases

项目摘要

With funding from the Macromolecular, Supramolecular & Nanochemistry Program of the Chemistry Division, Dr. Younan Xia of the Georgia Institute of Technology and Dr. Manos Mavrikakis of the University of Wisconsin-Madison will conduct fundamental research toward controlling the spatial arrangement (i.e. the crystal phase or structure) of atoms in nanocrystals. Such control could provide a versatile means of tailoring the electronic structure and catalytic properties of metal nanocrystals, opening the door to the development of advanced catalytic materials key to energy conversion and key for the production of important chemicals and pharmaceuticals. An important goal is to enable cost-effective and sustainable use of precious metals, some of the scarcest elements in the earth’s crust. The multi-disciplinary and collaborative nature of this project offers a natural vehicle to enrich the education and training experiences of all participants. The results from this project will be adapted to enhance classroom teaching, including the development of demonstrations (animations and experiments) related to key concepts in chemistry and chemical engineering. The investigators will promote diversity in higher education by engaging women, member of underserved groups in this research project. Specifically, Dr. Younan Xia and Dr. Manos Mavrikakis are developing colloidal methods for the synthesis of metal (e.g., ruthenium) nanocrystals in non-conventional, metastable crystal phases, together with well-controlled shapes or surface structures. These nanocrystals may open up avenues for observing new phenomena, enhancing existing processes, and enabling innovative applications. Currently, there are only a very limited number of reports on the synthesis of metal nanocrystals in metastable phases owing to the lack of a mechanistic understanding. Through an integration of experimental studies and computational modeling, the investigators seek to elucidate the trends and mechanisms involved in the synthesis, striving to establish experimental conditions for the reliable production of a specific crystal phase. The ruthenium nanocrystals will be used as seeds to template the deposition of other noble metals for the facile synthesis of core-shell nanocrystals featuring new, metastable crystal structures. In the context of structure-property relationships, the investigators will evaluate the catalytic activities of the metastable nanocrystals toward the oxygen evolution and oxygen reduction reactions.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

With funding from the Macromolecular, Supramolecular & Nanochemistry Program of the Chemistry Division, Dr. Younan Xia of the Georgia Institute of Technology and Dr. Manos Mavrikakis of the University of Wisconsin-Madison will conduct fundamental research towards controlling the spatial arrangement (i.e. the crystal phase or structure) of atoms in nanocrystals.这种控制可以提供一种多功能手段来调整金属纳米晶体的电子结构和催化特性，从而为开发高级催化材料的开发打开了能量转化的关键，以及生产重要化学品和药品的关键。一个重要的目标是实现贵金属的具有成本效益和可持续的使用，这是地壳中最稀有的元素。该项目的多学科和协作性质为丰富所有参与者的教育和培训经验提供了自然工具。该项目的结果将适应增强课堂教学，包括与化学和化学工程中关键概念有关的示范（动画和实验）的发展。研究人员将通过吸引妇女，该研究项目中服务不足的群体成员来促进高等教育的多样性。具体而言，Younan Xia博士和Manos Mavrikakis博士正在开发胶体方法，用于合成非惯性，亚稳态晶体相的金属（例如，ruthenium）纳米晶体，以及控制良好的形状或表面结构。这些纳米晶体可能会为观察新现象，增强现有过程并实现创新应用的途径开辟途径。目前，由于缺乏机械理解，关于金属纳米晶体合成金属纳米晶的合成的报告数量非常有限。通过实验研究和计算建模的整合，研究人员试图阐明合成中涉及的趋势和机制，努力为可靠的特定晶体产生提供实验条件。钌纳米晶体将用作种子，以模板将其他贵金属的沉积用于易于合成，其核心壳纳米晶体具有新的，稳定的晶体结构。在结构 - 质地关系的背景下，研究人员将评估亚稳态纳米晶体对氧气进化和减少氧气反应的催化活性。该奖项反映了NSF的法定任务，并被认为是通过基金会的智力优点和更广泛的影响审查标准来通过评估来通过评估来支持的。

项目成果

期刊论文数量（15）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Synthesis and Characterization of Pt‐Ag Icosahedral Nanocages with Enhanced Catalytic Activity toward Oxygen Reduction

具有增强氧还原催化活性的 Pt-Ag 二十面体纳米笼的合成与表征

DOI：
10.1002/cnma.202200186
发表时间：
2022
期刊：
ChemNanoMat
影响因子：
3.8
作者：
Wang, Wenxia;Shi, Yifeng;Chen, Zitao;Zhao, Ming;Cao, Zhenming;Lyu, Zhiheng;Chen, Ruhui;Xiao, Kaijun;Chi, Miaofang;Xia, Younan
通讯作者：
Xia, Younan

Shape Transformation via Etching and Regrowth: A Systematic Study of Pd Nanocrystals with Different Shapes and Twin Structures

通过蚀刻和再生进行形状转变：不同形状和孪晶结构的 Pd 纳米晶体的系统研究

DOI：
10.1002/chem.202301465
发表时间：
2023
期刊：
Chemistry – A European Journal
影响因子：
0
作者：
Lv, Tian;Liu, Maochang;Zhou, Siyu;Xia, Younan
通讯作者：
Xia, Younan

Phase-Controlled Deposition of Ru on Pd Nanocrystal Templates: Effects of Particle Shape and Size

DOI：
10.1021/acs.jpcc.2c08825
发表时间：
2023-01
期刊：
The Journal of Physical Chemistry C
影响因子：
0
作者：
A. Janssen;Quynh N. Nguyen;Zhiheng Lyu;Veronica D. Pawlik;Chenxiao Wang;Younan Xia
通讯作者：
A. Janssen;Quynh N. Nguyen;Zhiheng Lyu;Veronica D. Pawlik;Chenxiao Wang;Younan Xia

Synthesis of Pd@Rh nanocubes with well-defined {100} surface and controlled shell thicknesses for the fabrication of Rh nanocages

具有明确{100}表面和受控壳厚度的 Pd@Rh 纳米立方体的合成，用于制造 Rh 纳米笼