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Received January 28, 2019
Accepted February 27, 2019
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염화암모늄 전해질에 포함된 퀴논 레독스 활물질 조합을 이용한 수계 레독스 흐름 전지 성능 평가
Performance Evaluation of Aqueous Redox Flow Battery using Quinone Redox Couple Dissolved in Ammonium Chloride Electrolyte
1서울과학기술대학교 에너지환경대학원, 01811 서울특별시 노원구 공릉로 232 2서울과학기술대학교 화공생명공학과, 01811 서울특별시 노원구 공릉로 232
1Graduate School of Energy and Environment, Seoul National University of Science and Technology, 232, Gongreung-ro, Nowon-gu, Seoul, 01811, Korea 2Chemical and Biological Engineering department, Seoul National University of Science and Technology, 232, Gongreung-ro, Nowon-gu, Seoul, 01811, Korea
Korean Chemical Engineering Research, April 2019, 57(2), 239-243(5), 10.9713/kcer.2019.57.2.239 Epub 5 April 2019
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Abstract
본 연구에서는 Anthraquinone-2,7-disulfonic acid (2,7-AQDS)와 Tiron을 수계 레독스 흐름 전지 음극 및 양극 활물질로 사용하며 기존의 황산 전해질 대신 중성인 염화암모늄 (NH4Cl)을 전해질로 도입하였다. 이렇게 전해질을 변경함으로써, 황산 전해질의 낮은 셀 전압(0.76 V)을 1.01 V까지 향상시킬수 있다. 성능 최적화를 위해 염화암모늄 전해질에 0.1M로 활물질 농도를 맞춰 컷-오프 전압에 변화를 주며 완전지셀 성능을 평가하였다. 0.2~1.6 V 구간의 컷-오프 전압으로 40 mA/cm2하에서 20 사이클 동안 완전지셀을 테스트한 결과, 충전 동안 수소가 발생하였다. 이에 컷-오프 전압 조절로 충전 전압을 낮춰서 수소 발생을 제한하고자 0.2~1.2 V 구간으로 40 mA/cm2하에서 완전지셀 테스트를 진행하였다. 수소 발생은 없었으며, 전류 효율 99%, 방전 용량 3.3 Ah/L의 성능을 보였다.
In this study, anthraquinone-2,7-disulfonic acid (2,7-AQDS) is used as negative active material and Tiron is used as positive active material for aqueous redox flow battery (RFB). In previous results that used the 2,7-AQDS and Tiron, sulfuric acid (H2SO4) was a supporting electrolyte. However, in this study, ammonium chloride (NH4Cl) is suggested as the electrolyte for the first time. By changing the supporting electrolyte from H2SO4 to NH4Cl, the cell voltage of RFB is improved from 0.76 V to 1.01 V. To investigate the effect of NH4Cl supporting electrolyte of the performance of RFB, the full-cell tests of RFB using 2,7-AQDS and Tiron that are dissolved in NH4Cl supporting electrolyte are carried out, while cut-off voltage range is a main parameter to determine their performance. When the cut-off voltage range is 0.2~1.6 V, the hydrogen evolution occurs during charging step. To address the side reaction effect, the cut-off voltage range is changed to 0.2~1.2 V. When the revised cut-off voltage range is used and the current density of 40 mA/cm2 is applied, hydrogen evolution is not observed and the optimal RFB shows the charge efficiency of 99% and discharge capacity of 3.3 Ah/L at 10cycle.
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Lee W, Permatasari A, Kwon BW, Kwon Y, Chem. Eng. J., 358, 1438 (2019)
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