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.

在国家科学基金会化学系的大分子，超分子和纳米化学（MSN）计划的支持下，北卡罗来纳大学教堂山分校的Jeffrey E. Dick博士旨在开发一种创新的方法，以在室温下在室温下合成高groly nanoparticles。 高熵合金纳米颗粒包含通过粒子均匀分布的五个或多个等摩尔金属元件。 这样的纳米颗粒可能显示出异常的化学特性，并在催化，储能和转换设备中具有影响。 但是，在室温下以精确控制其形状，尺寸，堆肥和表面覆盖层在不同底物上合成这些纳米颗粒是一项挑战。 迪克博士的小组正在开发一种新型的电化学方法，以在室温下将高熵合金纳米颗粒沉积在导电表面上。 这项研究旨在实现对电沉积过程的机械理解，以便能够对纳米颗粒结构和特性进行精确控制。 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。该项目将通过教育，研究和科学参与计划（Nanoverse）计划通过纳米材料外展（Nanoverse）计划来增强代表性不足的少数群体的参与。 Nanoverse计划将吸引学生在北卡罗来纳州的历史悠久的黑人学院（HBCUS）中吸引学生。 研讨会活动旨在激发他们从事纳米科学，电化学和材料科学的研究生工作。最后，Nanoverse计划将为中等教育的STEM教师提供资源，以在其高中教室中向学生介绍纳米科学。开发的电击合成涉及从悬浮在非水相中悬浮的亚耐加热液水滴中的高熵合金纳米颗粒的电沉积。 该项目的总体目标是了解影响纳米颗粒形状，大小，形态，微结构和表面覆盖的因素和因素。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。第一个目标是了解和量化单纳米颗粒水平的成核和生长机制，以及探针传递热力学和动力学。第二个目标是了解表面活性剂，应用潜力和退火对纳米颗粒形态和微观结构的影响。第三个目标是探测底物效应，以及表面如何影响纳米核的几何形状和所得的高熵合金纳米颗粒。这些结果可能对利用高熵合金纳米粒子的优势的电催化，储能和转换，纳米材料和下一代生物传感器的领域具有广泛的影响。该奖项反映了NSF的法定任务，并通过评估该基金会的知识分子优点和广泛的影响来评估NSF的法定任务。

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