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제125회 대한화학회 학술발표회 및 총회 Highly stable and efficient three-dimensional boron-doped mesoporous graphene electrocatalyst as a high-performance electrode material for all-vanadium redox flow batteries

2020년 2월 13일 16시 54분 49초
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Material Chemistry
저자 및
David Odhiambo Opar, Rosalynn Nankya1, JeongWon Park1, Hyun Jung1,*
Chemistry, Dongguk University, Korea
1Department of Chemistry, Dongguk University, Korea
The development and introduction of highly efficient and stable nanostructured electrocatalysts to the electrode material, capable of operating at a high current density is crucial to the broader market penetration of vanadium redox flow batteries (VRFBs). In this report, three-dimensional boron-doped mesoporous graphene functionalized carbon felt (BMG-CF) electrode is synthesized, fabricated and tested as positive and negative electrodes for VRFB. Morphological results show that BMG-CF electrode exhibits a homogenous distribution of boron atoms and electrochemical testing indicates enhanced electrocatalytic activity towards VO2+/VO2+ and V2+/V3+ redox couples compared to activated-CF (A-CF) and mesoporous graphene-CF (MG-CF). Notably, BMG-CF electrode based VRFB attain energy efficiencies (EE) of 88.5% and 74.4% at current densities of 50 mA cm-2 and 150 mA cm-2, which are 9.6% and 13.2% higher than those of A-CF electrodes. Furthermore, the battery can be operated at very high current densities of 175 mA cm-2 and 225 mA cm-2 with EE of 70.7% and 59.8% and exhibit excellent cycle stability for more than 100 cycles at 100 mA cm-2 and superior rate capability at current densities of 50-225 mA cm-2. The outstanding electrochemical performance exhibited by BMG-CF electrode is ascribed to large surface area, 3D B-doped mesoporous structures and high electrical conductivity. The above results indicate the applicability of the highly efficient and stable BMG-CFs as promising electrodes for VRFB.