Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Suppressing Effect of Hydrogen Evolution by Oxygen Functional Groups on CNT/ Graphite Felt Electrode for Vanadium Redox Flow Battery

탄소나노튜브/흑연펠트 전극의 산소작용기를 활용한 바나듐 레독스 흐름 전지의 수소발생 억제 효과

  • Kim, Minseong (Department of Marine design Convergence Engineering, Pukyong National University) ;
  • Ko, Minseong (Department of Marine design Convergence Engineering, Pukyong National University)
  • 김민성 (부경대학교 마린융합디자인공학과) ;
  • 고민성 (부경대학교 마린융합디자인공학과)
  • Received : 2021.07.15
  • Accepted : 2021.08.09
  • Published : 2021.08.31
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Abstract

Vanadium redox flow batteries (VRFB) have emerged as large-scale energy storage systems (ESS) due to their advantages such as low cross-contamination, long life, and flexible design. However, Hydrogen evolution reaction (HER) in the negative half-cell causes a harmful influence on the performance of the VRFB by consuming current. Moreover, HER hinders V2+/V3+ redox reaction between electrode and electrolyte by forming a bubble. To address the HER problem, carbon nanotube/graphite felt electrode (CNT/GF) with oxygen functional groups was synthesized through the hydrothermal method in the H2SO4 + HNO3 (3:1) mixed acid solution. These oxygen functional groups on the CNT/GF succeed in suppressing the HER and improving charge transfer for V2+/V3+ redox reaction. As a result, the oxygen functional group applied electrode exhibited a low overpotential of 0.395 V for V2+/V3+ redox reaction. Hence, this work could offer a new strategy to design and synthesize effective electrodes for HER suppression and improving the energy density of VRFB.

Keywords

Acknowledgement

이 논문은 2019년도 부경대학교 자율창의 학술연구과제의 지원을 받아 수행된 연구임 (C-D-2019-1352).

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