Collaborative Research: Understanding and Tuning the Molecular Arrangement and Charge Storage Properties of Textured Graphene-Ionic Liquid Interface

合作研究：理解和调节织构化石墨烯-离子液体界面的分子排列和电荷存储特性

• 批准号: 1904887
• 负责人: James Batteas
• 金额: $ 21.72万
• 依托单位: Texas A&M University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-06-15 至 2023-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1904887&HistoricalAwards=false
• 关键词: Collaborative; Research; Understanding; Tuning; Molecular

Non-technical summary With the ever-increasing need for electrical power on demand, next generation energy storage devices (batteries and supercapacitors) must be designed that can support higher energy densities than current technologies. Therefore, new electrolyte and electrode materials must be explored that allow for higher electrolyte packing densities. To improve electrode/electrolyte interfaces, this project, supported by the Solid State and Materials Chemistry program in the Division of Materials Research at NSF, seeks to understand how the structure of ionic liquids and their arrangement at electrode interfaces may be tuned by precisely controlling electrode geometry on the nanoscale. Single-layer graphene, a carbon-based material, just one-atom thick, which can function as a conductive electrode that is highly flexible, is used to created textured electrodes for this study. The research team investigates the influence of the electrode morphology on the organization of the ionic liquid electrolyte and how it impacts charge storage. In addition to exploring these fundamental science questions, this project supports the education and training of undergraduate and graduate students from diverse backgrounds, at the intersection of materials and surface science, contributing to the development of the energy sector work force in the U.S., by training students in cross-cutting research in a coordinated collaborative environment between the labs of the principle investigators at UIUC and TAMU. Technical summaryWith this grant, supported by the Solid State and Materials Chemistry program in the Division of Materials Research at NSF, the principle investigators (Espinosa-Marzal at UIUC and Batteas at TAMU) test the fundamental hypothesis that by controlling surface morphology and substrate-induced charge doping, along with the chemical composition of the ionic liquids, the local packing density of the liquid on graphene can be precisely modulated. This in turn is expected to afford better control over their charge storage properties. To fill the outlined knowledge gap, the team pursues three major lines of research. New methods to prepare graphene surfaces with precisely controlled charge doping and morphology from the atomic to the nanoscale are developed. In addition, the effects of substrate morphology and charge doping on the interfacial structure of ionic liquids and on the characteristics of the electrical double layer are investigated by Atomic Force Microscopy in an electrochemical cell. Furthermore, local and global electrochemical impedance spectroscopy are used to relate the electrical double layer to the differential capacitance of the textured interfaces. These studies allow determining the relative contributions of graphene roughness, charge doping and ionic liquid composition on the electrical double layer and its capacitance. The knowledge gained from this project is expected to enable control of the interfacial assembly of the liquids and stored charge through the modulation of the graphene texture.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.

非技术摘要随着对电力需求的不断增长，下一代储能设备（电池和超级电容器）的设计必须能够支持比当前技术更高的能量密度。因此，必须探索新的电解质和电极材料，以实现更高的电解质填充密度。为了改善电极/电解质界面，该项目得到了美国国家科学基金会材料研究部固态和材料化学项目的支持，旨在了解如何通过精确控制电极来调节离子液体的结构及其在电极界面上的排列纳米尺度上的几何形状。单层石墨烯是一种碳基材料，只有一个原子厚，可以用作高度柔性的导电电极，用于为本研究创建纹理电极。研究小组研究了电极形态对离子液体电解质组织的影响以及它如何影响电荷存储。除了探索这些基础科学问题外，该项目还支持来自不同背景的本科生和研究生在材料和表面科学交叉领域的教育和培训，通过培训为美国能源行业劳动力的发展做出贡献学生们在 UIUC 和 TAMU 的主要研究人员实验室之间的协调协作环境中进行跨领域研究。技术摘要 在 NSF 材料研究部固态和材料化学项目的支持下，这项资助的主要研究人员（UIUC 的 Espinosa-Marzal 和 TAMU 的 Batteas）测试了基本假设，即通过控制表面形态和基质诱导电荷掺杂以及离子液体的化学成分，可以精确调节石墨烯上液体的局部堆积密度。这反过来又有望更好地控制它们的电荷存储特性。为了填补概述的知识空白，该团队进行了三个主要研究方向。开发了从原子到纳米尺度上精确控制电荷掺杂和形态的石墨烯表面制备新方法。此外，通过原子力显微镜在电化学电池中研究了基底形貌和电荷掺杂对离子液体界面结构和双电层特性的影响。此外，局部和全局电化学阻抗谱用于将双电层与纹理界面的微分电容联系起来。这些研究可以确定石墨烯粗糙度、电荷掺杂和离子液体成分对双电层及其电容的相对贡献。从该项目中获得的知识预计将能够通过石墨烯纹理的调节来控制液体的界面组装和存储的电荷。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力优点和技术进行评估，被认为值得支持。更广泛的影响审查标准。

项目成果

Insight into the Electrical Double Layer of Ionic Liquids Revealed through Its Temporal Evolution

通过时间演化揭示离子液体的双电层

• DOI: 10.1002/admi.202001313
• 发表时间: 2020-11
• 期刊: Advanced Materials Interfaces
• 影响因子: 5.4
• 作者: Han, Mengwei;Kim, Hojun;Leal, Cecilia;Negrito, Maelani;Batteas, James D.;Espinosa‐Marzal, Rosa M.
• 通讯作者: Espinosa‐Marzal, Rosa M.

Water in the Electrical Double Layer of Ionic Liquids on Graphene

石墨烯上离子液体双电层中的水

• DOI: 10.1021/acsnano.3c01043
• 发表时间: 2023-05
• 期刊: ACS Nano
• 影响因子: 17.1
• 作者: Zheng, Qianlu;Goodwin, Zachary A. H.;Gopalakrishnan, Varun;Hoane, Alexis G.;Han, Mengwei;Zhang, Ruixian;Hawthorne, Nathaniel;Batteas, James D.;Gewirth, Andrew A.;Espinosa
• 通讯作者: Espinosa

Using Patterned Self-Assembled Monolayers to Tune Graphene–Substrate Interactions

使用图案化自组装单层膜来调节石墨烯与基底的相互作用

• DOI: 10.1021/acs.langmuir.1c01136
• 发表时间: 2021-08
• 期刊: Langmuir
• 影响因子: 3.9
• 作者: Negrito, Maelani;Elinski, Meagan B.;Hawthorne, Nathaniel;Pedley, Mckenzie P.;Han, Mengwei;Sheldon, Matthew;Espinosa;Batteas, James D.
• 通讯作者: Batteas, James D.