超薄纳米管结构用于PEM燃料电池中的质量高效和耐用氧降解反应催化剂
Jieyuan Liu1, Shiyuan Liu1, Fangzheng Yan1
1School of Materials Science and Engineering, Beihang University, Beijing 100191, P. R. China.
Journal of the American Chemical Society
|October 5, 2022
概括
超薄孔纳米管 (UHT) 结构合金催化剂克服了质子交换膜燃料电池的挑战. 这些新型催化剂具有高活性和耐用性,符合美国能源部的高效能源转化目标.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 基于的催化剂对于质子交换膜燃料电池中的氧降解反应至关重要.
- 对于当前的催化剂来说,同时实现高质量活性和耐久性仍然是一个重大挑战.
研究的目的:
- 开发具有增强质量活性和耐久性的新型合金催化剂.
- 研究超薄孔纳米管 (UHT) 结构化催化剂的结构性关系.
主要方法:
- 超薄孔纳米管 (UHT) 结构的 Pt-M (M = Ni,Co) 合金催化剂的合成.
- 催化剂结构,表面积和元素组成的表征.
- 在燃料电池条件下进行电化学测试以评估质量活性和耐用性.
主要成果:
- 具有UHT结构的Pt-M催化剂表现出超薄壁 (2-3纳米) 并形成自支的薄催化剂层 (<1μm).
- 独特的纳米管结构促进了有效的质量转移和100%的表面曝光,最大限度地利用原子.
- 合金效应和纳米管结构有助于高内在活性和耐降解 (例如,奥斯瓦尔德成熟).
- 催化剂成功满足了美国能源部的质量活动和负载和启动停止周期的双重耐用性目标.
结论:
- 超薄孔纳米管 (UHT) 结构的 Pt-M 合金催化剂为高性能质子交换膜燃料电池提供了有前途的策略.
- 开发的催化剂表现出卓越的原子效率和长期稳定性,解决了当前电催化剂技术的关键局限性.
- 这项工作提供了一个新的结构设计原则,用于制造具有卓越性能和耐久性的先进电催化剂.
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