He Huajin, Liao Ying, Zuo Wenhua, Li Guochang, Gu Jiabao, Li Yixiao, Hu Zheng, Yang Yong
State Key Laboratory of Physical Chemistry of Solid Surface, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, 361005, China.
Key Laboratory of Mesoscopic Chemistry of MOE and Jiangsu Provincial Laboratory for Nanotechnology, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu, 210023, China.
Small. 2021 Nov;17(47):e2103778. doi: 10.1002/smll.202103778. Epub 2021 Oct 10.
Reducing SF (as gas cathode) in Li batteries is a promising concept for the double benefit of mildly converting greenhouse SF and providing a high theoretical energy density of 3922 Wh kg . However, the reduction process is hampered by its sluggish kinetics. Here, cobalt phthalocyanine (CoPc) molecules immobilized on porous carbon matrix are, for the first time, introduced to the LiSF chemistry to deliver an enhanced energy density. It is revealed that the high redox potential of Co(II)Pc/[Co(I)Pc] (≈2.85 V) facilitates the formation of Co(I)N sites to catalyze the SF electrochemical reduction. By using highly porous holey nitrogen-doped carbon nanocages as carbon matrix, the LiSF cells deliver a high discharge voltage of 2.82 V at 50 mA g and an unprecedented areal capacity of 25 mAh cm at 0.1 mA cm , much superior to previous results. This work opens up new possibilities for high-efficiency conversion of SF in lithium batteries.
在锂电池中还原SF（作为气体阴极）是一个很有前景的概念，它具有温和转化温室气体SF和提供3922 Wh kg的高理论能量密度这双重好处。然而，还原过程受到其缓慢动力学的阻碍。在此，首次将固定在多孔碳基质上的钴酞菁（CoPc）分子引入Li-SF化学体系中，以提高能量密度。结果表明，Co(II)Pc/[Co(I)Pc]的高氧化还原电位（≈2.85 V）促进了Co(I)-N位点的形成，从而催化SF的电化学还原。通过使用高度多孔的有孔氮掺杂碳纳米笼作为碳基质，Li-SF电池在50 mA g下提供2.82 V的高放电电压，在0.1 mA cm下具有前所未有的25 mAh cm的面积容量，远优于先前的结果。这项工作为锂电池中SF的高效转化开辟了新的可能性。
