Catalyst-ionomer interactions in electrochemical systems

电化学系统中催化剂与离聚物的相互作用

• 批准号: 2132659
• 负责人: Svitlana Pylypenko
• 金额: $ 35.35万
• 依托单位: Colorado School of Mines
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-02-01 至 2025-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2132659&HistoricalAwards=false
• 关键词: Catalyst; ionomer; interactions; electrochemical; systems

Electrochemical energy conversion systems including polymer electrolyte membrane (PEM) fuel cells and water electrolyzers are central to reducing global fossil fuel dependence through widespread implementation of renewable hydrogen. Great improvements have been made in reducing the amount of expensive noble metals needed for high-performance. Nevertheless, significant opportunity exists for further improving fuel cell/electrolyzer performance through optimization of the interface between the catalyst and the ion-conducting medium known as the ionomer. The study utilizes state-of-the-art instrumentation, combined with a suite of electrochemical characterization methods, to gain unprecedented insight regarding the interfacial interactions between the catalyst layers and the ionomer. The resulting fundamental insights regarding catalyst-ionomer interactions across a range of catalytic systems – under conditions emulating device operation – will translate directly to improved designs of durable, low-cost PEM fuel cells and other water electrolyzer systems. The study involves a set of interconnected research and educational goals, both aimed at expanding knowledge of electrochemical devices, ensuring a highly trained future workforce, and highlighting the importance of renewable energy to the broader public.The project will develop fundamental understanding of catalyst-ionomer interfaces and interactions, determine the effects of catalyst and support chemistry and morphology on these interfaces and interactions, and track evolution of interfacial structure and composition under sustained electrochemical reaction. The project will also establish best practices and protocols for PEM catalyst layer surface studies that can be applied to other systems. A variety of X-ray photoelectron spectroscopy experiments under in situ conditions, in conjunction with complementary characterization, will investigate the evolution of both catalyst-ionomer interactions and interfaces during exposure to relevant conditions for three material sets of increasing complexity: 1) ionomer thin films, 2) catalyst-ionomer composites, and 3) integrated electrodes. The resulting insights will guide future work in designing novel catalyst systems and electrodes with optimized surfaces and interfaces as well as improved performance and durability. Knowledge obtained from this project will be disseminated to a wide audience through publications, participation in workshops and conferences, and close interactions with scientists from academia, national labs, and industry. The investigator will contribute to the education of STEM teachers through the AVS Science Educators workshop (SEW) and through the Summer Workshop on Energy Education for Teachers (SWEET) program at the investigator’s institution. The project also focuses on increasing participation from underrepresented minority groups and training future leaders capable of transforming scientific understanding related to clean-energy and climate impact via renewable resources.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.

电化学转化系统在内，包括聚合物电解质膜（PEM）燃料电池和水电油层是通过宽度可再生氢的宽度实施来降低全球化石燃料依赖性的核心。减少高性能所需的昂贵高贵金属的数量已经取得了重大改进。然而，通过优化催化剂和被称为离子体的离子传导介质之间的界面来进一步改善燃料电池/电解酶性能的重要机会。该研究利用最先进的仪器，再加上一系列电化学特征方法，以获得有关催化剂层与离子体之间界面相互作用的前所未有的见解。在模拟设备操作的条件下，关于催化系统的催化剂离子体相互作用的基本见解将直接转化为改进的耐用，低成本的PEM燃料电池和其他水电层系统的设计。该研究涉及一组相互联系的研究和教育目标，旨在扩大对电化学设备的了解，确保训练有素的未来劳动力，并强调可再生能源对更广泛的公众的重要性。和持续电化学反应下的组成。该项目还将为PEM催化剂层表面研究建立最佳实践和协议，并可以应用于其他系统。结合完整的表征，在原位条件下进行的各种X射线光电子光谱实验将研究催化剂离子体相互作用和接口在暴露于相关条件的情况下的三个材料复杂性集合期间的演变：1）离子薄膜，2）离子薄膜，2）Catalyst-ionomer Comptresss和3）集成电子。最终的见解将指导未来在设计具有优化表面和界面的新型催化剂系统和电子的工作，并提高了性能和耐用性。从该项目获得的知识将通过出版物，参加研讨会和会议的参与以及与学术界，国家实验室和行业的科学家进行密切互动，将其传播给广泛的受众。研究人员将通过AVS Science教育工作者研讨会（SEW）以及调查员机构的教师能源教育（Sweet）课程的夏季研讨会为STEM教师的教育做出贡献。该项目还着重于增加代表性不足的少数群体的参与以及培训能够通过可再生资源转化与清洁能源和气候影响有关的科学理解的未来领导者。该奖项反映了NSF的法定任务，并被认为是通过基金会的知识分子优点和更广泛影响的审查标准来通过评估来通过评估来获得的支持。

项目成果

Aging gracefully? Investigating iridium oxide ink's impact on microstructure, catalyst/ionomer interface, and PEMWE performance

• DOI: 10.1016/j.jpowsour.2023.233503
• 发表时间: 2023-08-17
• 期刊: JOURNAL OF POWER SOURCES
• 影响因子: 9.2
• 作者: Lyu, Xiang;Foster, Jayson;Serov, Alexey
• 通讯作者: Serov, Alexey