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Updated: May 16, 2025

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低温热解:为燃料电池的高负荷单原子催化剂提供通用途径

Xiaoyang Cheng¹, Shuhu Yin², Jianing Zhang¹

¹State Key Laboratory of Physical Chemistry of Solid Surfaces, Engineering Research Center of Electrochemical Technologies of Ministry of Education, College of Chemistry and Chemical Engineering Xiamen University, Xiamen, 361005, China.

Advanced materials (Deerfield Beach, Fla.)

|April 4, 2025

概括

一种新的低温转金属化方法在450°C时合成高负荷单原子催化剂 (SAC),克服奥斯瓦尔德成熟. 由此产生的基于Fe的SAC在燃料电池中表现出色.

科学领域:

材料科学材料科学材料科学
催化剂是一种催化剂.
电化学电化学电化学

背景情况:

高温热解 (HTP) 对于单原子催化剂 (SAC) 是常见的,但由于Ostwald在高温 (≥900°C) 上成熟而受到限制.
在高合成温度下,由于聚合和相变问题,实现高单原子负荷是具有挑战性的.

研究的目的:

为高负荷单原子催化剂开发低温合成策略.
研究一种转金属化方法,用于创建原子分散的M-N4位点.
评估合成的SACs在氧降解反应和燃料电池中的催化性能.

主要方法:

一种低温转金属化合成,涉及过渡金属离子和 Zn2+ 在添加碳 (NC) 基质上之间的离子交换.
使用融盐介质以在降低温度 (450°C) 下促进阴离子交换.
合成催化剂的特性和性能测试,包括在H2-O2燃料电池中的电化学评估.

主要成果:

成功合成了原子分散的M-N4位点的高质量负荷 (3.7-4.7 wt.%) 的单原子催化剂.
证明了在450°C时有效发生阴离子交换,显著降低了合成能量障碍.
在H2-O2燃料电池中,Fe-SAC催化剂的峰值功率密度为1.12 W cm-2,显示出出色的催化活性.

结论:

开发的低温转金属化方法有效合成高负荷单原子催化剂,减轻奥斯瓦尔德成熟.
这种方法为生产用于电化学应用的先进SAC提供了更节能的途径.
合成的基于Fe的SAC显示出对高效的氧降解反应和燃料电池性能有前途的潜力.

关键词:

具有高单原子负荷的高单原子负荷低温转金属化低温转金属化融盐是一种融化盐.氧减少反应反应的氧减少反应.一个原子的催化剂.

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