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Hierarchical Carbon Micro/Nanonetwork with Superior Electrocatalysis for High‐Rate and Endurable Vanadium Redox Flow Batteries
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Hierarchical Carbon Micro/Nanonetwork with Superior Electrocatalysis for High‐Rate and Endurable Vanadium Redox Flow Batteries
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Journal Article
Hierarchical Carbon Micro/Nanonetwork with Superior Electrocatalysis for High‐Rate and Endurable Vanadium Redox Flow Batteries
2018
Overview
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. A hierarchical carbon micro/nanonetwork (HCN) with nitrogen and phosphorus codoping is fabricated, which serves as a stable and high‐area structure to homogenize the ion and electron distribution and accelerate vanadium redox reactions with the aid of abundant catalytic sites, exhibiting a high‐rate performance and durable cycle life toward vanadium redox flow battery.
Publisher
John Wiley & Sons, Inc,John Wiley and Sons Inc
