Feng Rui, Ruan Qi-Dong, Feng Jiu-Ju, Yao You-Qiang, Li Lin-Mei, Zhang Lu, Wang Ai-Jun
College of Chemistry and Materials Science, College of Geography and Environmental Sciences, Key laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Normal University, Jinhua, 321004, PR China.
Zhejiang Provincial Key Laboratory of Robotics and Intelligent Manufacturing Equipment Technology, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, PR China.
J Colloid Interface Sci. 2023 Oct 28;654(Pt B):1240-1250. doi: 10.1016/j.jcis.2023.10.134.
Single-atom transition metal-based nitrogen-doped carbon (M-N-C) is regarded as high-efficiency and cost-effectiveness alternatives to replace noble metal catalysts for oxygen reduction reaction (ORR) in renewable energy storage and conversion devices. In this work, rich FeCo dual-single atoms were efficiently entrapped into N-doped carbon nanocages (FeCo DSAs-NCCs) by simple pyrolysis of the bimetallic precursors doped zeolitic imidazolate framework-8 (ZIF-8), as affirmed by a series of characterizations. The graphitization degree of the N-doping carbon substrate was regulated by modulating the pyrolysis temperature and the types of the metal salts. The typical catalyst substantially improved the alkaline ORR performance, with the onset potential (E) of 0.99 V (vs. RHE) and half-wave potential (E) of 0.88 V (vs. RHE). Ultimately, the catalyst-assembled Zn-air battery possessed a higher open-circuit voltage of 1.501 V, larger power density of 123.7 mW cm, and outstanding durability for 150 h. This study provides a guide on developing ORR catalysts for electrochemical energy conversion and storage technology.
单原子过渡金属基氮掺杂碳（M-N-C）被视为在可再生能源存储和转换装置中替代贵金属催化剂用于氧还原反应（ORR）的高效且具成本效益的替代品。在这项工作中，通过对掺杂沸石咪唑酯骨架-8（ZIF-8）的双金属前驱体进行简单热解，将丰富的铁钴双单原子有效地捕获到氮掺杂碳纳米笼（FeCo DSAs-NCCs）中，这一点得到了一系列表征的证实。通过调节热解温度和金属盐的类型来调控氮掺杂碳基底的石墨化程度。典型的催化剂显著改善了碱性ORR性能，起始电位（E）为0.99 V（相对于可逆氢电极，RHE），半波电位（E）为0.88 V（相对于RHE）。最终，由该催化剂组装的锌空气电池具有1.501 V的更高开路电压、123.7 mW cm的更大功率密度以及150小时的出色耐久性。本研究为开发用于电化学能量转换和存储技术的ORR催化剂提供了指导。
