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一种真空蒸汽沉积策略,用于为高性能Zn-Air电池提供具有密集活性位点的单原子催化剂

Xiang Yang¹, Baohui Zhu¹, Zhiyang Gao¹

¹State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)

|May 16, 2024

概括

铁单原子催化剂 (SAC) 提供高效的氧降解反应 (ORR). 这项研究提出了一种新的方法,用于在N-化碳纳米板上密集地包装铁SAC,以提高Zn-空气电池的性能.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
催化剂是一种催化剂.

背景情况:

铁单原子催化剂 (SAC) 对氧降解反应 (ORR) 是有前途的.
在SACs中实现高密度的可访问活跃站点仍然是一个挑战.
铁原子聚合在支上阻碍了催化剂的性能.

研究的目的:

制定铁SACs的制造策略,其中包括密集的活性站点.
为了增强ORR的铁SACs的催化活性和设备性能.
为了研究新型铁SACs的结构性能关系.

主要方法:

在超薄的N-化碳纳米板 (FeSAs-UNCNS) 上制造铁SAC的真空蒸汽沉积策略.
实验性表征以确认活性部位的密度和配置 (Fe─N₄O).
在0.1MKOH中进行电化学测试,并在Zn-空气电池中应用.

主要成果:

FeSAs-UNCNS实现了可访问活跃站点的高密度 (1.11 × 10²⁰站点g^-1).
催化剂表现出了0.951V的半波潜力与ORR的RHE相比.
使用FeSAs-UNCNS的Zn-空气电池表现出最大功率密度为306mW cm-2和超过180小时的周期寿命.

结论:

真空蒸汽沉积方法有效地产生密集的铁SAC.
FeSAs-UNCNS显著优于商业Pt/C和其他Zn空气电池中报告的SAC.
增强的质量/电荷转移和有利的动力学有助于优越的催化活性.

关键词:

2D 材料是二维材料.气电池是气电池的一种.活动现场工程活动现场工程.氧降解反应反应的氧降解反应一个原子催化剂.

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