Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Relationship between Concentration and Performance of Supporting Electrolyte of Redox Flow Battery Using Polyoxometalate

Polyoxometalate를 이용한 레독스 흐름전지의 지지 전해질 농도와 성능의 관계

  • Yong Jin Cho (Department of Chemical Engineering, Kangwon National University) ;
  • Byeong Wan Kwon (Department of Chemical Engineering, Kangwon National University)
  • 조용진 (강원대학교(삼척캠퍼스) 화학공학전공) ;
  • 권병완 (강원대학교(삼척캠퍼스) 화학공학전공)
  • Received : 2023.01.30
  • Accepted : 2023.03.09
  • Published : 2023.04.10
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Abstract

Herein we present a tested aqueous based redox flow battery (RFB) that employs phosphomolybdic acid and ferrocyanide as the negative and positive active species in an aqueous sodium hydroxide solution. The different concentrations of NaOH solution, such as 1.0, 1.2, 1.4, 1.5, and 1.6 M, were prepared for checking the electrochemical properties and stability. The NaOH concentration as a supporting electrolyte in the negative species appears to play an important role in the electrochemical properties of phosphomolybdic acid. Moreover, the optimum value of the concentration is necessary for the best performance. The resistance of the electrolyte decreased with increasing the concentration up to 1.5 M and then increased to 1.6 M. Hence, the decrease in electrolyte resistance appears to greatly influence the energy efficiency, which is improved by increasing the concentration of NaOH. In addition, the 1.5 M NaOH solution appears to be the concentration required for optimum performance.

본 연구에서는 음극 활물질로 폴리옥소메탈에이트(polyoxometalate, POM)인 포스포몰리브 산(phosphomolybdic acid)와 양극 활물질로 페로시아나이드(ferrocyanide)를 지지 전해질인 수산화나트륨 수용액을 이용하여 산화환원 흐름 전지(redox flow battery, RFB)를 구성하였다. 다양한 농도의 수산화나트륨 수용액(1.0 M, 1.2 M, 1.4 M, 1.5 M, 1.6 M)을 이용하여 배터리의 성능테스트를 진행하였으며, 각 물질에 대한 전기화학적 특성과 안정성에 대해 연구하였다. 지지 전해질의 농도는 음극 활물질인 포스포몰리브 산에 영향을 주며 최적 값이 존재하고 농도가 증가할수록 전해질 저항이 줄어들게 되며 1.5 M에서 가장 줄어드는 현상을 확인하였고 1.6 M로 농도가 증가할 시 전해질 저항이 다시 증가한다는 것을 확인하였다. 전해질 저항의 감소는 전체 에너지 효율에도 영향을 주어 농도가 증가됨에 따라 효율은 증가하며 1.5 M에서 가장 좋은 배터리 성능을 보인다는 것을 확인하였다.

Keywords

Acknowledgement

이 논문은 2020년도 강원대학교 대학회계 학술연구조성비와 정부(교육부)의 재원으로 한국연구재단의 지원(No.2021R1l1A3060236)에 의하여 연구하였음.

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