Doped metal oxide electrocatalyst supports with enhanced conductivity

具有增强电导率的掺杂金属氧化物电催化剂载体

• 批准号: RGPIN-2020-05152
• 负责人: Easton, EBradley
• 金额: $ 2.11万
• 依托单位: University of Ontario Institute of Technology
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=765027
• 关键词: Doped; metal; oxide; electrocatalyst; supports

Polymer electrolyte membrane fuel cells (PEMFC) are clean, portable power sources powered by hydrogen from secure and renewable sources that produce water and electricity. Current PEMFC technology relies heavily on platinum (Pt) electrocatalysts to drive the anodic and cathodic reactions. Normally, Pt nanoparticles are dispersed onto a high surface carbon support (Pt/C) to maximize the surface area of the catalyst and increase cell performance. While carbon black has been the de facto catalyst support in fuel cell over the last 30 years, it is a liability when it comes to durability since it is prone to corrosion under the highly acidic and oxidative operating conditions of a PEM fuel cell. This is detrimental to the long-term performance of a fuel cell and hinders the longevity of fuel cell devices. Thus, new materials are needed to address these fundamental issues. My lab recently discovered an exciting and entirely new fuel cell catalyst support material. Specifically, his group has invented a conductive metal oxide catalyst support that has the potential to replace the carbon support commonly used in current fuel cell electrodes. This proposal is focused on the study and enhancement of a new reaction whereby we dope low cost metal oxides like titanium dioxide with various metals and semi-metals (e.g. Mo, Si). My lab was the first to discover that doping with silicon (Si) could greatly enhance the conductivity of these metal oxide support materials. These new support materials have extremely high stability to corrosion and remarkable high electronic conductivity, considerably larger than any other metal oxide-based support developed to date. These properties make these supports highly attractive for deployment in fuel cell systems for automotive and stationary power applications. A more stable support that also enhances the performance/stability of the expensive Pt catalyst would revolutionize fuel cells, improving performance and operational lifetimes, thereby enabling greater uptake of fuel cell technology to replace less eco-friendly power sources used in automotive and stationary power applications. Our long-term objectives seek to understand how the presence of the doping elements (e.g Si, Mo) influences the physical properties of the resultant oxide material. Furthermore, I seek to understand how doping influences the electrochemical properties of the support and nanoparticle catalyst particles that are dispersed onto it. To address these questions, my group will create novel metal oxide support materials with different compositions and perform detailed electrochemical studies of these supports and catalysts. Furthermore, the durability of these catalysts will be examined in order to understand how chemical composition and operating conditions influence the stability of these electrode materials so that they can be better used in reliable clean energy technology.

聚合物电解质膜燃料电池(PEMFC)是一种清洁的便携式电源，由安全和可再生的氢气供电，可产生水和电。目前的质子交换膜燃料电池技术在很大程度上依赖于铂(铂)电催化剂来驱动阳极和阴极反应。通常，铂纳米颗粒分散在高表面碳载体(铂/碳)上，以最大限度地扩大催化剂的表面积，提高电池性能。虽然在过去的30年里，炭黑一直是燃料电池中事实上的催化剂载体，但在耐用性方面，它是一个弱点，因为它在PEM燃料电池的高度酸性和氧化操作条件下容易腐蚀。这不利于燃料电池的长期性能，并阻碍燃料电池装置的寿命。因此，需要新的材料来解决这些根本问题。我的实验室最近发现了一种令人兴奋的全新燃料电池催化剂载体材料。具体地说，他的团队发明了一种导电金属氧化物催化剂载体，有可能取代目前燃料电池电极中常用的碳载体。这项建议的重点是研究和加强一种新的反应，通过这种反应，我们在低成本的金属氧化物如二氧化钛中掺杂各种金属和半金属(如Mo，Si)。我的实验室是第一个发现掺杂硅(Si)可以大大提高这些金属氧化物载体材料的导电性的。这些新的载体材料具有极高的耐腐蚀性和显著的高电子传导性，比迄今为止开发的任何其他金属氧化物载体都要大得多。这些特性使这些支撑件在汽车和固定电源应用的燃料电池系统中的部署具有极大的吸引力。更稳定的载体还可以提高昂贵的铂催化剂的性能/稳定性，这将使燃料电池发生革命性变化，提高性能和运行寿命，从而使更多地采用燃料电池技术，以取代汽车和固定电源应用中使用的不太环保的电源。我们的长期目标是了解掺杂元素(如硅、钼)的存在如何影响生成的氧化物材料的物理性质。此外，我试图了解掺杂如何影响载体和分散在其上的纳米催化剂颗粒的电化学性质。为了解决这些问题，我的团队将创造不同组成的新型金属氧化物载体材料，并对这些载体和催化剂进行详细的电化学研究。此外，还将检查这些催化剂的耐用性，以了解化学成分和操作条件如何影响这些电极材料的稳定性，以便它们能够更好地用于可靠的清洁能源技术。