通过结构工程对三相接口和质量转移的协同调节,用于高性能氧气电催化剂的结构工程
1State Key Laboratory of Nonlinear Mechanics, Beijing Key Laboratory of Engineered Construction and Mechanobiology, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, P. R. China.
ACS applied materials & interfaces
|March 16, 2026
概括
研究人员在半孔碳基板上开发了一种新的NiCu合金催化剂,以增强空气电池 (ZAB) 中的氧气运输和活性位点. 这一策略显著提高了电池性能和功率密度.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 空气电池 (ZAB) 的高功率密度输出受到缓慢的氧气质量转移和在三相接口上受限的活性站点可用性限制.
- 开发协同策略以优化这些接口对于推进ZAB技术至关重要,但具有挑战性.
研究的目的:
- 设计一个由合金催化剂支持的合碳基质 (Ni0.67Cu0.33/meso-NC) 的半孔性合金催化剂,以增强 ZAB 空气电极中的微三相接口.
- 调查中等度对氧气质量转移,活动地点可访问性和ZAB整体性能的影响.
主要方法:
- 合成Ni0.67Cu0.33合金纳米颗粒在一个半孔N-化碳基板上.
- 电化学表征,包括氧降解反应 (ORR) 活性测量和ZAB性能测试.
- 分析催化剂的结构及其对质量转移和接口特性的影响.
主要成果:
- 与非半孔对应物和商业Pt/C相比,Ni0.67Cu0.33/meso-NC催化剂表现出更高的ORR活性 (E1/2 = 0.883 V,jL = 5.83 mA cm-2)
- 电化学分析证实了增强的三相接口活性位点和加速的质量转移由于中孔结构.
- 使用Ni0.67Cu0.33/meso-NC催化剂的ZAB实现了232.6mW cm-2的高峰功率密度和400小时的稳定运行.
结论:
- 半孔架构有效地作为氧气扩散的"高速公路",增加可访问的三相接口,并缓解活跃站点阻塞.
- 对中孔催化剂和空气电极的协同优化为高性能金属空气电池提供了可行的策略.
- 这项工作表明了提高空气电池功率密度和稳定性的有希望的方法.
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