Jia Yining, Shi Chunjing, Zhang Wei, Xia Wei, Hu Ming, Huang Rong, Qi Ruijuan
Key Laboratory of Polar Materials and Devices (MOE), Department of Electronics Sciences, School of Physics and Electronic Science, East China Normal University, Shanghai 200062, China.
Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200241, China.
Nanomaterials (Basel). 2022 May 7;12(9):1593. doi: 10.3390/nano12091593.
Single-atom non-precious metal oxygen reduction reaction (ORR) catalysts have attracted much attention due to their low cost, high selectivity, and high activity. Herein, we successfully prepared iron single atoms anchored on nitrogen-doped carbon matrix/nanotube hybrid supports (FeSA-NC/CNTs) by the pyrolysis of Fe-doped zeolitic imidazolate frameworks. The nitrogen-doped carbon matrix/carbon nanotube hybrid supports exhibit a specific surface area of 1626.814 m g, which may facilitate electron transfer and oxygen mass transport within the catalyst and be beneficial to ORR performance. Further electrochemical results revealed that our FeSA-NC/CNTs catalyst exhibited excellent ORR activity (half-wave potential: 0.86 V; kinetic current density: 39.3 mA cm at 0.8 V), superior to that of commercial Pt/C catalyst (half-wave potential: 0.846 V; kinetic current density: 14.4 mA cm at 0.8 V). It also has a great stability, which makes it possible to be a valuable non-noble metal electrode material that may replace the latest commercial Pt/C catalyst in the future.
单原子非贵金属氧还原反应（ORR）催化剂因其低成本、高选择性和高活性而备受关注。在此，我们通过热解铁掺杂的沸石咪唑酯骨架，成功制备了锚定在氮掺杂碳基质/纳米管混合载体（FeSA-NC/CNTs）上的铁单原子。氮掺杂碳基质/碳纳米管混合载体的比表面积为1626.814 m²/g，这可能有助于催化剂内部的电子转移和氧质量传输，并有利于ORR性能。进一步的电化学结果表明我们的FeSA-NC/CNTs催化剂表现出优异的ORR活性（半波电位：0.86 V；在0.8 V时的动力学电流密度：39.3 mA/cm²），优于商业Pt/C催化剂（半波电位：0.846 V；在0.8 V时的动力学电流密度：14.4 mA/cm²）。它还具有很高的稳定性，这使其有可能成为一种有价值的非贵金属电极材料，未来可能会取代最新的商业Pt/C催化剂。
