MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150001, Heilongjiang Province, China.
MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150001, Heilongjiang Province, China; State Key Laboratory of Metastable Materials Science and Technology, College of Environment and Chemical Engineering, Hebei Key Laboratory of Heavy Metal Deep-remediation in Water and Resource Reuse, Yanshan University, Qinhuangdao 066004, Hebei Province, China.
J Colloid Interface Sci. 2023 May;637:10-19. doi: 10.1016/j.jcis.2023.01.057. Epub 2023 Jan 16.
Platinum group metal (PGM)-free catalysts represented by nitrogen and iron co-doped carbon (Fe-N-C) catalysts are desirable and critical for metal-air batteries, but challenges still exist in performance and stability. Here, cerium oxides (CeO) are incorporated into a two-dimensional Fe-N-C catalyst (FeNC-Ce-950) via a host-guest strategy. The Ce/Ce redox system creates a large number of oxygen vacancies for rapid O adsorption to accelerate the kinetics of oxygen reduction reaction (ORR). Consequently, the as-synthesized FeNC-Ce-950 catalyst exhibits a half-wave potential (E) of 0.921 V and negligible decay (<2 mV for ΔE) after 5,000 accelerated durability cycles, significantly outperforming most of ORR catalysts reported in recent years and precious metal counterparts. When applied in a zinc-air battery, it demonstrates a peak power density of 175 mW cm and a specific capacity of 757 mAh g. This study also provides a reference for the exploration of Fe-N-C catalysts decorated with variable valence metal oxides.
无贵金属（PGM）的催化剂，以氮和铁共掺杂碳（Fe-N-C）催化剂为代表，对于金属空气电池来说是理想且关键的，但在性能和稳定性方面仍存在挑战。在这里，通过主客体策略将氧化铈（CeO）掺入二维 Fe-N-C 催化剂（FeNC-Ce-950）中。Ce/Ce 氧化还原体系为快速 O 吸附创造了大量的氧空位，从而加速了氧还原反应（ORR）的动力学。因此，所合成的 FeNC-Ce-950 催化剂表现出 0.921 V 的半波电势（E）和在 5000 次加速耐久性循环后可忽略的衰减（ΔE 小于 2 mV），显著优于近年来报道的大多数 ORR 催化剂和贵金属对应物。当应用于锌空气电池时，它表现出 175 mW cm 的峰值功率密度和 757 mAh g 的比容量。本研究还为探索具有可变价金属氧化物的 Fe-N-C 催化剂提供了参考。
