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대한화학회 제124회 학술발표회 및 총회 High electrocatalytic performance of three-dimensional nitrogen-doped mesoporous graphene-modified carbon felt electrodes for vanadium redox flow batteries

2019년 8월 29일 16시 49분 54초
MAT.P-389 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 17일 (목요일) 11:00~12:30
Material Chemistry
저자 및
David Odhiambo Opar, Rosalynn Nankya1, Hyun Jung1,*
Chemistry, Dongguk University, Korea
1Department of Chemistry, Dongguk University, Korea
We demonstrate the synthesis of highly electrocatalytic three-dimensional (3D) nitrogen-doped mesoporous graphene-modified carbon felt (NMG-CF) via a facile hydrothermal process, to act as electrocatalysts for vanadium redox flow battery (VRFB). Morphological and spectroscopic studies indicate that the NMG-CF exhibits a uniform distribution of nitrogen atoms (2.19 at.%) and successful N-doping in the form of pyridinic-N, pyrrolic-N, quaternary-N and oxidic-N configurations. NMG-CF show excellent catalytic activity towards VO2+/VO2+ and V2+/V3+ redox couples compared to mesoporous graphene-CF (MG-CF) and activated CF (A-CF), attributed to 3D N-doped mesoporous structures, enhanced specific surface area and rapid charge transfer. Furthermore, N-doping generates defects acting as active sites and alters the electronic and chemisorption properties of MG, hence NMG-CF is more electrochemically accessible than A-CF and MG-CF. Moreover, charge/discharge curves exhibit a high energy efficiency (EE) of 75.1% at a high current density of 150 mA cm-2 in NMG-CF, compared to MG-CF (71.7%) and A-CF (57.1%). Furthermore, NMG-CF shows excellent stability and rate capability (EE ~ 81% after 100 charge/discharge cycles at 100 mA cm-2), with a limiting current density of 275 mA cm-2, indicating the outstanding performance of the modified electrodes during the vanadium ions redox reaction under acidic conditions. The above results reveal applicability of NMG-CF, as a promising advanced electrode material for VRFB.