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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

基本信息

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

项目摘要

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.

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）必须设计成能够支持比当前技术更高的能量密度。因此，必须探索允许更高电解质填充密度的新电解质和电极材料。为了改善电极/电解质界面，该项目由NSF材料研究部的固态和材料化学计划支持，旨在了解如何通过精确控制电极几何形状来调整离子液体的结构及其在电极界面的排列。单层石墨烯是一种碳基材料，只有一个原子厚，可以用作高度灵活的导电电极，用于为这项研究创建纹理电极。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。除了探索这些基本的科学问题，该项目还支持来自不同背景的本科生和研究生的教育和培训，在材料和表面科学的交叉点，为美国能源部门劳动力的发展做出贡献，通过在UIUC和TAMU的主要研究人员的实验室之间的协调合作环境中培训学生进行交叉研究。技术摘要在NSF材料研究部的固态和材料化学项目的支持下，（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衬底诱导的电荷掺杂，沿着离子液体的化学组成，可以精确地调节液体在石墨烯上的局部堆积密度。这又有望提供对它们的电荷存储性质的更好控制。为了填补所概述的知识差距，该团队进行了三大研究。开发了制备石墨烯表面的新方法，这些方法具有精确控制的电荷掺杂和从原子到纳米级的形态。此外，在电化学电池中利用原子力显微镜研究了基底形态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，局部和全局的电化学阻抗谱被用来与双电层的纹理界面的差分电容。这些研究允许确定石墨烯粗糙度、电荷掺杂和离子液体组成对双电层及其电容的相对贡献。从该项目中获得的知识有望通过石墨烯纹理的调制来控制液体和储存电荷的界面组装。该奖项反映了NSF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。