原子Fe-N4位点与间层相邻的Ir-N4的旋转状态的调节,用于高级ORR活动
Yan Tan1, Aoshuang Li1, Yijie Wang1
1School of Physics Science and Engineering, Tongji University, Shanghai, 200092, People's Republic of China.
Nano-micro letters
|March 5, 2026
概括
开发用于氧降解反应 (ORR) 的先进电催化剂至关重要. 这项研究介绍了新型双金属单原子催化剂 (IrFe-SACs),具有特殊的ORR活性和耐用性,用于能源应用.
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:
- 氧降解反应 (ORR) 的高效和耐用的电催化剂对于清洁能源技术至关重要,但仍然是一个重大挑战.
- 目前的ORR催化剂通常活动不良,稳定性不佳或成本高,阻碍了燃料电池和金属空气电池等设备的广泛应用.
研究的目的:
- 设计和合成具有增强ORR活性和耐久性的新型双金属单原子催化剂 (SAC).
- 通过实验性表征和理论计算,研究改善催化性能背后的基本机制.
主要方法:
- 密度函数理论 (DFT) 的计算用于初始选和预测催化剂候选物.
- 用于合理设计和实验合成双金属单原子催化剂,支持3D排序的巨孔碳,采用了体微球模板限制反应方法.
- 通过使用循环电压测量和旋转盘电极测量等技术来评估电化学性能.
- 使用X射线光电子光谱 (XPS),X射线衍射 (XRD) 和传输电子显微镜 (TEM) 来进行材料表征.
- 进行了理论分析,包括旋转状态和轨道分析,以了解催化机制.
主要成果:
- 合成的Ir-N4 / Fe-N4双金属单原子催化剂 (IrFe-SACs) 显示出优异的ORR活性,达到0.928V的高半波潜力.
- 在空气电池中,IrFe-SACs表现出极好的性能,其高放电功率密度为314mW cm-2和在550小时内大约1650个循环的显著循环稳定性.
- 理论分析显示,层间邻的Ir-N4位点在Fe-N4位点中促进了旋转状态过渡,优化了旋转极化并增强了轨道非局部化,从而提高了内在的ORR活动和耐用性.
结论:
- 开发的IrFe-SACs代表了ORR非常有前途的电催化剂类别,在活性和耐用性方面提供了显著的改进.
- 这些发现为SAC中相邻的金属位之间的协同效应提供了关键的见解,为下一代电催化剂的合理设计铺平了道路.
- 气电池的卓越性能突显了这些催化剂在实际储能和转换应用中的潜力.
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