Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Performance Relationship of Iron-Based Anolyte According to Organic Compound Additives and Polyoxometalate-Based Catholyte in an Aqueous Redox Flow Battery

유기화합물 첨가제에 따른 철 기반 양극과 polyoxometalate 음극 기반 수계 레독스 흐름 전지의 성능 관계

  • Seo Jin Lee (Department of Chemical Engineering, Kangwon National University) ;
  • Byeong Wan Kwon (Department of Chemical Engineering, Kangwon National University)
  • 이서진 (강원대학교(삼척캠퍼스) 화학공학전공) ;
  • 권병완 (강원대학교(삼척캠퍼스) 화학공학전공)
  • Received : 2024.04.20
  • Accepted : 2024.06.03
  • Published : 2024.06.10
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Abstract

In this study, an aqueous-based redox flow battery (RFB) was constructed using tungstosilic acid (TSA), which is a kind of polyoxometalate, as the negative electrode active material and iron chloride (FeCl3) as the positive electrode active material in a sulfuric acid (H2SO4) supporting electrolyte. As a result of the cell's performance, it exhibited capacity fading and low energy efficiency. To address these issues, malic acid (MA), an organic additive, was introduced to the positive electrode active material and then tested for electrochemical properties and single cell performance. The malic acid in the iron chloride aqueous solution is working as a chelate agent, and two carboxyl groups are effectively coordinated with iron ions. It was found that MA reduced the electrolyte resistance of the positive electrode active material, leading to chemical stabilization and an increase in capacity and energy efficiency.

본 연구에서는 음극 활물질로 폴리옥소메탈레이트(polyoxometalate, POM)인 규소텅스텐산(tungstosilic acid, TSA)과 양극 활물질로 염화 철(iron chloride)을 사용하고, 지지 전해질 황산(H2SO4) 수용액을 이용한 수계 레독스 흐름 전지(redox flow battery, RFB)를 구성하였다. 운전 결과에 따르면 용량 저하와 낮은 에너지 효율을 보이는 문제점이 있었다. 이와 같은 문제를 해결하기 위해서 양극 활물질에 유기화합물 첨가제인 말산(malic acid)를 첨가하여, 첨가제에 따른 전기화학적 특성과 셀 충방전 테스트를 진행하였다. 말산은 염화 철 수용액에서 킬레이트제로 작용하였으며, 말산내 두 개의 카르복실기가 철 이온과 효과적으로 배위결합을 형성한다. 이는, 양극 활물질인 염화 철의 전해질 저항을 줄어들게 하여 화학적으로 안정화되어 용량과 에너지 효율의 증가를 이끌어냈다.

Keywords

Acknowledgement

이 논문은 정부(교육부)의 재원으로 한국연구재단의 지원(2022RIS-005)와 정부(교육부)의 재원으로 한국연구재단의 지원(No.2021R1l1A3060236)에 의하여 연구하였음.

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