期刊
ADVANCED SCIENCE
卷 5, 期 12, 页码 -出版社
WILEY
DOI: 10.1002/advs.201801281
关键词
carbon electrodes; durable cycle life; hierarchical carbon micro/nanonetworks; high-rate performance; vanadium redox flow batteries
资金
- Basic Science Center Project of Natural Science Foundation of China [51788104]
- National Key R&D Program of China [2016YFA0202500]
- National Natural Science Foundation of China [51772093, 21773264, 51772301]
- Transformational Technologies for Clean Energy and Demonstration, Strategic Priority Research Program of the Chinese Academy of Sciences [XDA21070300]
Vanadium redox flow batteries (VRFBs) are receiving increasing interest in energy storage fields because of their safety and versatility. However, the electrocatalytic activity of the electrode is a pivotal factor that still restricts the power and cycling capabilities of VRFBs. Here, a hierarchical carbon micro/nanonetwork (HCN) electrode codoped with nitrogen and phosphorus is prepared for application in VRFBs by cross-linking polymerization of aniline and physic acid, and subsequent pyrolysis on graphite felt. Due to the hierarchical electron pathways and abundant heteroatom active sites, the HCN exhibits superior electrocatalysis toward the vanadium redox couples and imparts the VRFBs with an outstanding energy efficiency and extraordinary stability after 2000 cycles at 250 mA cm(-2) and a discharge capacity of 10.5 mA h mL(-1) at an extra-large current density of 400 mA cm(-2). Such a micro/nanostructure design will force the advancement of durable and high-power VRFBs and other electrochemical energy storage devices.
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