Liu Mingrui, Ke Shaoqiu, Sun Chuangqing, Zhang Chenzhuo, Liao Shijun
National Energy Key Laboratory for New Hydrogen-Ammonia Energy Technologies, Foshan Xianhu Laboratory, Foshan 528200, China.
Hubei Key Laboratory of Photoelectric Materials and Devices, School of Materials Science and Engineering, Hubei Normal University, Huangshi 435002, China.
Nanomaterials (Basel). 2024 Dec 13;14(24):2003. doi: 10.3390/nano14242003.
Developing highly active and durable non-noble metal catalysts is crucial for energy conversion and storage, especially for proton exchange membrane fuel cells (PEMFCs) and lithium-oxygen (Li-O) batteries. Non-noble metal catalysts are considered the greatest potential candidates to replace noble metal catalysts in PEMFCs and Li-O batteries. Herein, we propose a novel type of non-noble metal catalyst (Fe-Hf/N/C) doped with Hf into a mesoporous carbon material derived from Hf-ZIF-8 and co-doping with Fe and N, which greatly enhanced the activity and durability of the catalyst. When applied in the cathode of PEMFCs, the current density can reach up 1.1 and 1.7 A cm at 0.7 and 0.6 V, respectively, with a maximum power density of 1.15 W cm. The discharge capacity of the Li-O batteries is up to 15,081 mAh g with Fe-Hf/N/C in the cathode, which also shows a lower charge overpotential, 200 mV lower than that of the Fe/N/C. Additionally, the Fe-Hf/N/C catalyst has demonstrated better stability in both PEMFCs and Li-O batteries. This reveals that Hf can not only optimize the electronic structure of iron sites and increase the active sites for the oxygen reduction reaction, but can also anchor the active sites, enhancing the durability of the catalyst. This study provides a new strategy for the development of high-performance and durable catalysts for PEMFCs and Li-O batteries.
开发高活性和耐用的非贵金属催化剂对于能量转换和存储至关重要，特别是对于质子交换膜燃料电池（PEMFC）和锂氧（Li-O）电池。非贵金属催化剂被认为是在PEMFC和Li-O电池中替代贵金属催化剂的最具潜力的候选者。在此，我们提出了一种新型的非贵金属催化剂（Fe-Hf/N/C），将Hf掺杂到由Hf-ZIF-8衍生的介孔碳材料中，并与Fe和N共掺杂，这大大提高了催化剂的活性和耐久性。当应用于PEMFC的阴极时，在0.7和0.6 V时电流密度分别可达1.1和1.7 A cm，最大功率密度为1.15 W cm。使用Fe-Hf/N/C作为阴极的Li-O电池放电容量高达15,081 mAh g，其充电过电位也更低，比Fe/N/C低200 mV。此外，Fe-Hf/N/C催化剂在PEMFC和Li-O电池中均表现出更好的稳定性。这表明Hf不仅可以优化铁位点的电子结构并增加氧还原反应的活性位点，还可以锚定活性位点，提高催化剂的耐久性。这项研究为开发用于PEMFC和Li-O电池的高性能和耐用催化剂提供了一种新策略。
