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Materials Chemistry of Superprotonic Solid Acids

超质子固体酸的材料化学

基本信息

批准号：
1807234
负责人：
Sossina Haile
金额：
$ 42.91万
依托单位：
Northwestern University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-09-01 至 2021-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1807234&HistoricalAwards=false
关键词：
Materials Chemistry Superprotonic Solid Acids

项目摘要

Non-technical Summary Materials with the ability to transport protons are essential for a wide range of technologies, from electricity production to ammonia synthesis. This project, funded by the Solid State and Materials Chemistry Program in the Division of Materials Research, focuses on the discovery of new proton conducting materials with exceptional transport due to structural disorder. Such materials combine remarkable "liquid-like" conductivity with the mechanical integrity of solids. Aiming to discover the design rules for creating new superprotonic conductors that meet a broad range of application needs, Prof. Haile and her group create new knowledge about the fundamental features of superprotonic conductivity through this study. Insights from their research will help, for example, to improve fuel cells for electricity production, to improve electrolyzers for hydrogen production, and to find new routes for ammonia synthesis. Beyond the specific scientific principles that are elucidated, the project advances the education of students across all levels, from engaging K-12 students through outreach activities, to guiding undergraduates and graduate students in cutting edge research.Technical Summary With funding from the Solid State and Materials Chemistry Program in the Division of Materials Research, this project advances the science of superprotonic solid acids, materials which are of increasing technological importance in a range of applications. Solid acid compounds can be described by the generic stoichiometry MnHm(AX4)p, where M is an alkali metal; A is an element such as S, P, or Se; X is oxygen or hydrogen; and n, m, and p are integers. A superprotonic solid acid is one in which rapid reorientation of AX4 polyanion groups facilitates fast proton conductivity. Typically, this disordered state is encountered at slightly elevated temperatures, and the transition to the superprotonic phase is accompanied by 3-4 orders of magnitude increase in conductivity. Through targeted chemical modifications to known superprotonic conductors the origins of the superprotonic transition and the magnitude of the conductivity in the superprotonic phase are elucidated. The research encompasses: (1) synthesis and structural characterization of solid acids with controlled substitutions on cation and polyanion sites; (2) measurement of transport properties; and (3) determination of phase stability. The insights gained are used to develop advanced materials that overcome the remaining technological barriers facing known superprotonic conductors.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.

具有传输质子能力的材料对于从电力生产到氨合成等广泛的技术都是必不可少的。该项目由材料研究部固态与材料化学项目资助，主要研究发现由于结构紊乱而具有特殊输运的新型质子导电材料。这种材料结合了显著的“液体样”导电性和固体的机械完整性。为了发现创造新的超质子导体的设计规则，以满足广泛的应用需求，Haile教授和她的团队通过这项研究创造了关于超质子导电性基本特征的新知识。例如，他们的研究成果将有助于改进用于发电的燃料电池，改进用于制氢的电解槽，并找到合成氨的新途径。除了阐明的具体科学原理之外，该项目还促进了各个层次学生的教育，从通过外展活动吸引K-12学生，到指导本科生和研究生进行前沿研究。在材料研究部固态和材料化学项目的资助下，该项目推进了超质子固体酸科学，这些材料在一系列应用中具有越来越重要的技术意义。固体酸性化合物可以用一般化学计量MnHm(AX4)p来描述，其中M是碱金属；A是一种元素，如S、P或Se；X是氧或氢；n m p都是整数。超质子固体酸是一种AX4聚阴离子基团快速重定向促进质子快速导电的固体酸。通常，这种无序状态是在稍微升高的温度下遇到的，并且过渡到超质子相伴随着电导率的3-4个数量级的增加。通过对已知超质子导体进行有针对性的化学修饰，阐明了超质子跃迁的起源和超质子相中电导率的大小。研究内容包括：(1)阳离子和阴离子位置可控取代固体酸的合成和结构表征；(2)输运性测量；(3)相稳定性的测定。获得的见解用于开发先进材料，克服已知超质子导体面临的剩余技术障碍。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

期刊论文数量（4）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Crystal structure, conductivity, and phase stability of Cs3(H1.5PO4)2 under controlled humidity

受控湿度下 Cs3(H1.5PO4)2 的晶体结构、电导率和相稳定性

DOI：
10.1016/j.ssi.2020.115291
发表时间：
2020
期刊：
Solid State Ionics
影响因子：
3.2
作者：
Sanghvi, Sheel;Haile, Sossina M.
通讯作者：
Haile, Sossina M.

A humidity-controlled precipitation technique enabling discovery of Rb3(H1.5PO4)2

湿度控制沉淀技术能够发现 Rb3(H1.5PO4)2

DOI：
10.1016/j.jssc.2020.121951
发表时间：
2021
期刊：
Journal of Solid State Chemistry
影响因子：
3.3
作者：
Sanghvi, Sheel;Haile, Sossina M.
通讯作者：
Haile, Sossina M.

Structure and Properties of Cs 7 (H 4 PO 4 )(H 2 PO 4 ) 8 : A New Superprotonic Solid Acid Featuring the Unusual Polycation (H 4 PO 4 ) +

Cs 7 (H 4 PO 4 )(H 2 PO 4 ) 8 的结构和性能：一种具有特殊聚阳离子(H 4 PO 4 )的新型超质子固体酸

DOI：
10.1021/jacs.0c08870
发表时间：
2020
期刊：
Journal of the American Chemical Society
影响因子：
15
作者：
Wang, Louis S.;Patel, Sawankumar V.;Sanghvi, Sheel S.;Hu, Yan-Yan;Haile, Sossina M.
通讯作者：
Haile, Sossina M.

Phase Behavior and Superionic Transport Characteristics of (M x Rb 1–x ) 3 H(SeO 4 ) 2 (M = K or Cs) Solid Solutions

(M x Rb 1-x ) 3 H(SeO 4 ) 2 (M = K 或 Cs) 固溶体的相行为和超离子输运特性