Abstract

Iron-based oxygen reduction reaction (ORR) catalysts have been the focus of research, and iron sources play an important role for the preparation of efficient ORR catalysts. Here, we successfully use LiFePO₄ as ideal sources of Fe and P to construct the heteroatom doped Fe-based carbon materials. The obtained Fe-N-P co-doped coral-like carbon nanotube arrays encapsulated Fe₂P catalyst (C-ZIF/LFP) shows very high half-wave potential of 0.88 V in alkaline electrolytes toward ORR, superior to Pt/C (0.85 V), and also presents a high half-wave potential of 0.74 V in acidic electrolytes, comparable to Pt/C (0.8 V). When further applied into a home-made Zn-air battery as cathode, a peak power density of 140 mW·cm² is reached, exceeds commercial Pt/C (110 mWcm²). Besides, it also presents exceptional durability and methanol resistance compared with Pt/C. Noticeably, the preparation method of such a high-performance catalyst is simple and easy to optimize, suitable for the large-scale production. What's more, it opens up a more sustainable development scenario to reduce the hazardous wastes such as LiFePO₄ by directly using them for preparing high-performance ORR catalysts.

中文翻译：

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ZIF-8 / LiFePO 4衍生的Fe-NP Co掺杂的碳纳米管包裹的Fe 2 P纳米粒子，可有效减少氧气和锌空气电池

摘要

铁基氧还原反应（ORR）催化剂一直是研究的重点，铁源在制备高效ORR催化剂中起着重要作用。在这里，我们成功地使用LiFePO ₄作为理想的Fe和P来源来构建杂原子掺杂的Fe基碳材料。所获得的Fe-NP共掺杂珊瑚状碳纳米管阵列，包裹了Fe ₂ P催化剂（C-ZIF / LFP），在碱性电解液中对ORR的半波电势很高，为0.88 V，优于Pt / C（0.85 V ），并且在酸性电解质中也呈现出0.74 V的高半波电势，与Pt / C（0.8 V）相当。当进一步应用于作为阴极的自制Zn-空气电池时，峰值功率密度达到140 mW·cm ²，超过了商用Pt / C（110 mWcm²）。此外，与Pt / C相比，它还具有出色的耐久性和耐甲醇性。值得注意的是，这种高性能催化剂的制备方法简单易优化，适合大规模生产。此外，它开辟了一个更具可持续性的发展方案，通过直接将LiFePO ₄等危险废物用于制备高性能ORR催化剂来减少此类废物。