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Hierarchical oxygen rich-carbon nanorods: Efficient and durable electrode for all-vanadium redox flow batteries
- Hierarchical oxygen rich-carbon nanorods: Efficient and durable electrode for all-vanadium redox flow batteries
- Aziz, Md. Abdul; Hossain, Syed Imdadul; Shanmugam, Sangaraju
- DGIST Authors
- Shanmugam, Sangaraju
- Issue Date
- Journal of Power Sources, 445
- Article Type
- Author Keywords
- Vanadium redox flow battery; NCNR; Carbon felt electrode; Electrochemical activity
- HIGH-PERFORMANCE ELECTRODE; GRAPHITE FELT; POSITIVE ELECTRODE; OXIDE; NANOFIBERS; ZEIN; NANOPARTICLES; SELECTIVITY; CATALYSTS; MEMBRANE
- We describe the fabrication of hierarchical oxygen and nitrogen enriched-carbon electrode materials from zein and polyacrylonitrile by a simple electrospinning technique for durable and high rate all-vanadium redox flow batteries (VRBs). The nitrogen-doped carbon nanorods (NCNR) provide abundant oxygen-rich and nitrogen active sites, and thereby, enhancing the catalytic activity toward both VO2+/VO2+ and V2+/V3+ ion redox reactions by improving ion transfer kinetics and faster electron transfer rate in VRB. With improving electrocatalytic properties, the NCNR decorating carbon felt electrode (NCNR/CF) exhibits excellent battery performance with an impressive specific capacity of 37.3 Ah L−1 than pristine CF (22.8 Ah L−1) and CNR/CF (28.6 Ah L−1) electrodes. The NCNR/CF electrode also shows an outstanding coulombic efficiency (CE, 98.9%) and energy efficiency (EE, 84.3%) compared with the pristine CF (CE, 91.2% and EE, 73.4%) and the CNR/CF (CE, 95.6% and EE, 81.2%) electrodes in the VRB at 40 mA cm−2 current density. Furthermore, the NCNR/CF electrode exhibits 10.9 and 3.1% higher EE as compared to the pristine CF and CNR/CF electrodes, respectively. Therefore, the impressive cyclic rate capability with negligible capacity decay proves the superiority of NCNR as a potential electrode material for all-vanadium redox flow batteries. © 2019 Elsevier B.V.
- Elsevier BV
- Related Researcher
Advanced Energy Materials Laboratory
Electrocatalysts for fuel cells; water splitting; metal-air batteries; Polymer electrolyte membranes for fuel cells; flow batteries; Hydrogen generation and utilization
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- Department of Energy Science and EngineeringAdvanced Energy Materials Laboratory1. Journal Articles
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