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原子分散的双金属ORR催化剂具有层次性的多孔结构,用于Zn-Air电池
Yuting He1, Junbo Yang1, Yi Wang1
1State Key Laboratory for Mechanical Behaviour of Materials, School of Materials Science & Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China.
ACS applied materials & interfaces
|February 27, 2024
概括
层次性多孔双原子催化剂 (FeNi-NPC-1000) 为氧气还原反应提供了组金属的有希望的替代品. 这种新的催化剂设计增强了金属空气电池的活性和稳定性.
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:
- 金属--碳 (M-N-C) 催化剂显示出氧降解反应 (ORR) 的潜力,但其内在活性和活性位点密度较低.
- 优化电子和孔隙结构是提高M-N-C催化剂性能的关键.
- 开发用于电子调制的多孔结构的简单方法仍然是一个挑战.
研究的目的:
- 设计和合成一种新的层次,多孔的双原子催化剂,以改善ORR活动.
- 为了研究双金属FeNi-NPC-1000催化剂的结构-活性关系.
- 评估空气电池 (ZAB) 中催化剂的性能.
主要方法:
- 使用Na2CO3模板和双金属兴奋剂策略合成FeNi-NPC-1000.
- 使用诸如AC-STEM和XAS等技术进行表征.
- 对ORR活动和ZAB性能进行电化学测试.
- 密度函数理论 (DFT) 计算以确定活跃站点.
主要成果:
- 与Pt/C (E1/2 = 0.867 V vs RHE) 相比,FeNi-NPC-1000具有较高的特定表面积 (1412.8 m2 g-1) 和更高的ORR活性 (E1/2 = 0.877 V 与 RHE)
- FeNi-N8-C部分被确定为高效ORR催化的主要活性位点.
- 作为ZAB中的空气阴极,FeNi-NPC-1000表现出极好的放电性能 (Pmax = 367.1 mW cm-2) 和长期稳定性.
结论:
- 层次的,多孔的双原子FeNi-NPC-1000催化剂有效地克服了传统M-N-C催化剂的局限性.
- 该研究为设计用于储能应用的先进双金属原子催化剂提供了新的策略.
- 优化的孔隙和电子结构对于金属空气电池的高性能电催化是至关重要的.
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