在聚合物电解质膜燃料电池中进行氧降解反应的生物启发的高耐用铁酸催化剂
Wenmu Li1, Aiping Yu, Drew C Higgins
1Department of Chemical Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1.
Journal of the American Chemical Society
|November 13, 2010
概括
一种新的铁酸催化剂 (Fe-SPc) 为聚合物电解质膜燃料电池 (PEMFC) 中的氧降解反应提供了增强的耐用性,其性能优于商业催化剂.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 聚合物电解质膜燃料电池 (PEMFCs) 需要高效和耐用的电催化剂来进行氧降解反应 (ORR).
- 目前的贵金属催化剂面临着与成本和稳定性相关的挑战.
- 基于铁酸 (Fe-Pc) 的催化剂被探索为不贵重的替代品.
研究的目的:
- 设计和合成一种非常耐用的非贵金属铁酸基催化剂 (Fe-SPc),用于PEMFC中的ORR.
- 研究新型Fe-SPc催化剂的结构性质和催化性能.
- 为了比较Fe-SPc与商业Fe-Pc催化剂的稳定性和活性.
主要方法:
- 用非热解方法合成Fe-SPc,以控制原子结构和表面特性.
- 电化学描述ORR活动和稳定性通过扫动潜力循环.
- 结构分析以了解功能组的作用和硬质障碍.
主要成果:
- 与商业Fe-Pc相比,Fe-SPc催化剂表现出明显改善的ORR稳定性.
- Fe-SPc的初始ORR活动可与商业Fe-Pc相比较.
- Fe-SPc在10个循环后的电流密度增加了4.6倍,在100个循环后的电流密度增加了7.4倍.
- 增强的稳定性归因于电子捐赠的功能组和孤立的活性位点.
结论:
- 非珍贵的Fe-SPc催化剂显示出在PEMFC中ORR的有希望的高耐久性和活性.
- 这种新的合成方法可以精确控制催化剂结构,从而提高性能.
- 在未来的燃料电池应用中,Fe-SPc为贵金属催化剂提供了可行的替代方案.
相关概念视频
Batteries and Fuel Cells
A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
Microbial Fuel Cells
Microbial fuel cells (MFCs) are bioelectrochemical devices that generate electricity by exploiting the metabolic processes of electrogenic bacteria. These systems provide a renewable energy source and serve as an innovative method for treating organic waste, such as wastewater.A typical MFC consists of two chambers: an anoxic (oxygen-free) compartment that houses the bacteria and an oxic (oxygen-rich) compartment that contains oxygen as the terminal electron acceptor. Many MFCs use proton...


