TiN作为Fe─N─C气凝氧降解催化剂中的激素清除剂,用于耐用燃料电池
1Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, 109 De Ya Road, Changsha, Hunan, 410073, China.
Small (Weinheim an der Bergstrasse, Germany)
|February 24, 2024
概括
本研究介绍了用于质子交换膜燃料电池 (PEMFC) 的TiN化Fe─N─C催化剂. 新的催化剂显著提高了耐用性,并保持了氧减氧反应 (ORR) 的高活性,为提供了具有成本效益的替代品.
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:
- 质子交换膜燃料电池 (PEMFC) 对于清洁能源至关重要,但基于的催化剂价格昂贵.
- 铁--碳 (Fe─N─C) 催化剂显示出作为一种具有成本效益的替代品的希望,但其耐用性较差.
- Fe─N─C催化剂的耐用性不足,阻碍了它们在PEMFC中得到广泛应用.
研究的目的:
- 合成一种耐用且活跃的Fe─N─C催化剂,用于PEMFC中的氧减少反应 (ORR).
- 研究TiN兴奋剂在提高Fe─N─C催化剂的耐用性和活性方面的作用.
- 为PEMFC应用开发一个具有成本效益的,无金属的催化剂.
主要方法:
- 用TiN合的Fe─N─C (Fe─N─C/TiN) 催化剂的Sol-gel合成.
- 氧降解反应 (ORR) 活性和耐久性的电化学表征.
- 使用合成的催化剂制造和测试H2─O2燃料电池.
主要成果:
- Fe─N─C/TiN催化剂表现出抑制的H2O2产量 (<4%),明显低于Fe─N─C.
- 催化剂保持了高的ORR活性,在30,000个周期后,半波潜力只有15mV的损失.
- 使用Fe─N─C/TiN的PEMFC实现了高电流密度 (980 mA cm−2) 和功率密度 (880 mW cm−2),在10,000个循环后电压损失最小.
结论:
- TiN 兴奋剂有效地清除自由基中间体,提高Fe─N─C催化剂的耐用性.
- Fe─N─C/TiN的复合结构提供了一个高度多孔的网络,具有出色的ORR活性和稳定性.
- Fe─N─C/TiN 代表了PEMFCs一个有前途的耐用和活跃的无金属催化剂.
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