CAREER: Electro-Shock Synthesis of High Entropy Alloy Nanoparticles from Sub-Femtoliter Reactors

职业：亚飞升反应器电冲击合成高熵合金纳米粒子

• 批准号: 2327563
• 负责人: Jeffrey Dick
• 金额: $ 70万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-06-15 至 2026-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2327563&HistoricalAwards=false
• 关键词: CAREER; Electro; Shock; Synthesis; Entropy

With the support of the Macromolecular, Supramolecular, and Nanochemistry (MSN) Program of the Division of Chemistry at the National Science Foundation, Dr. Jeffrey E. Dick of the University of North Carolina at Chapel Hill aims to develop an innovative approach to the synthesis of high entropy alloy nanoparticles at room temperature. High entropy alloy nanoparticles contain five or more equimolar metallic elements homogenously distributed through the particle. Such nanoparticles may display unusual chemical properties and have implications in catalysis, energy storage and conversion devices. However, it is challenging to synthesize these nanoparticles at room temperature with precise control of their shape, size, compostion, and surface coverage on different substrates. Dr. Dick's group is developing a novel electrochemical methodology to deposit high entropy alloy nanoparticles on conductive surfaces at room temperature. This research strives to achieve a mechanistic understanding of the electrodeposition process in order to enable precisel control of the nanoparticle structure and properties. Students working on this project will gain experience in synthesizing nanomaterials. Students will also use state-of-the-art nanoscience tools to study high entropy alloy nanoparticles and reactivity. This project will enhance the participation of underrepresented minorities through the Nanomaterials Outreach via Education, Research, and Scientific Engagement (NANOVERSE) program. The NANOVERSE program will engage students in Historically Black Colleges and Universities (HBCUs) in North Carolina. The workshop activities are designed to inspire them to pursue graduate work in nanoscience, electrochemistry, and materials science. Finally, the NANOVERSE program will give secondary education STEM teachers resources to introduce students to nanoscience in their high school classrooms. The Electro-Shock synthesis being developed involves the electrodeposition of high entropy alloy nanoparticles from metal salt precursors in sub-femtoliter water droplets that are suspended in a non-aqueous phase. The overarching goal of this project is to understand the electrodeposition mechanism and factors that influence the nanoparticle shape, size, morphology, microstructure and surface coverage. A high level of control requires a detailed understanding of the reactivity and the boundary between the water droplet, the oil continuous phase, and the electrode surface. The first goal is to understand and quantify the nucleation and growth mechanisms at the single nanoparticle level and probe ion transfer thermodynamics and kinetics. The second goal is understanding the effect of surfactant, applied potential, and annealing on nanoparticle morphology and microstructure. The third goal is probing substrate effects and how surfaces influence the nanodroplet geometry and the resulting high entropy alloy nanoparticle. These results could have broad implications on the fields of electrocatalysis, energy storage and conversion, nanomaterials, and next-generation biosensors that take advantage of high entropy alloy nanoparticles.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.

在美国国家科学基金会化学部高分子、超分子和纳米化学 (MSN) 项目的支持下，北卡罗来纳大学教堂山分校的 Jeffrey E. Dick 博士致力于开发一种创新的合成方法室温下高熵合金纳米粒子的制备 高熵合金纳米颗粒包含均匀分布在颗粒中的五种或更多种等摩尔金属元素。 这种纳米颗粒可能表现出不寻常的化学性质，并对催化、能量存储和转换装置产生影响。 然而，在室温下合成这些纳米颗粒并精确控制其形状、尺寸、组成和在不同基材上的表面覆盖度具有挑战性。 迪克博士的小组正在开发一种新颖的电化学方法，可以在室温下将高熵合金纳米颗粒沉积在导电表面上。 这项研究致力于实现对电沉积过程的机械理解，以便能够精确控制纳米颗粒的结构和性能。 从事该项目的学生将获得合成纳米材料的经验。学生还将使用最先进的纳米科学工具来研究高熵合金纳米颗粒和反应性。该项目将通过纳米材料教育、研究和科学参与 (NANOVERSE) 计划加强代表性不足的少数群体的参与。 NANOVERSE 计划将吸引北卡罗来纳州历史悠久的黑人学院和大学 (HBCU) 的学生。 研讨会活动旨在激励他们追求纳米科学、电化学和材料科学方面的研究生工作。最后，NANOOVERSE 计划将为中等教育 STEM 教师提供资源，以便在高中课堂上向学生介绍纳米科学。正在开发的电击合成涉及从悬浮在非水相中的亚飞升水滴中的金属盐前体电沉积高熵合金纳米颗粒。 该项目的总体目标是了解电沉积机制以及影响纳米颗粒形状、尺寸、形态、微观结构和表面覆盖的因素。高水平的控制需要详细了解水滴、油连续相和电极表面之间的反应性和边界。第一个目标是理解和量化单个纳米粒子水平的成核和生长机制以及探测离子转移热力学和动力学。第二个目标是了解表面活性剂、施加电势和退火对纳米粒子形态和微观结构的影响。第三个目标是探测基底效应以及表面如何影响纳米液滴的几何形状以及由此产生的高熵合金纳米颗粒。这些结果可能对电催化、能量存储和转换、纳米材料以及利用高熵合金纳米粒子的下一代生物传感器等领域产生广泛影响。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准。

项目成果

For Zinc Metal Batteries, How Many Electrons go to Hydrogen Evolution? An Electrochemical Mass Spectrometry Study

对于锌金属电池，有多少电子去析氢？

• DOI: 10.1002/anie.202319010
• 发表时间: 2024
• 期刊: Angewandte Chemie International Edition
• 作者: Roy, Kingshuk;Rana, Ashutosh;Heil, Joseph N.;Tackett, Brian M.;Dick, Jeffrey E.
• 通讯作者: Dick, Jeffrey E.

How Solvation Energetics Dampen the Hydrogen Evolution Reaction to Maximize Zinc Anode Stability

• DOI: 10.1002/aenm.202303998
• 发表时间: 2024-02
• 期刊: Advanced Energy Materials
• 影响因子: 27.8
• 作者: Kingshuk Roy;Ashutosh Rana;Tushar K. Ghosh;Joseph N Heil;Sayan Roy;Kathryn J. Vannoy;Brian M. Tackett;Ming Chen;J. Dick