Catalytic production of impurity-free $V^{3.5+}$ vanadium electrolyte for vanadium redox flow batteries = 촉매 반응을 이용한 바나듐 레독스 흐름 전지용 고순도 3.5가 전해질의 제조

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Vanadium redox flow battery (VRFB) is considered as one of the most promising candidate for a large-scale energy storage system. However, commercialization of VRFB has been hindered due to high manufacturing cost of the vanadium electrolyte which is currently prepared by a costly electrolysis method with a limited productivity. To address the problem of high electrolyte production costs, we propose a simple chemical production of impurity-free $V^{3.5+}$ valence state electrolyte. The method features the use of catalyst and organic reducing agent (ORA) which enables reduction of $V^{4+}$ to $V^{3+}$ vanadium ion without releasing any impurity. Among various ORAs, formic acid showed fastest reaction kinetics in combination with Pt/C or PtRu/C catalysts. Activity and stability of catalysts were compared for a proper catalyst selection. In spite of a higher activity of PtRu/C, dissolution of Ru prohibits its use due to a severe gas evolution during cell operation by deposition of Ru onto the electrode. $V^{3.5+}$ electrolyte was successfully produced by combination of formic acid and Pt/C, and excellent VRFB performances were achieved with the electrolyte. A prototype of catalytic reactor employing Pt/C decorated carbon felts was designed and a high quality electrolyte production in continuous manner was demonstrated. We believe the proposed catalytic production of VRFB electrolyte is a breakthrough invention for the VRFB technology, and it would bring significant development of VRFB system in industry.
Advisors
Kim, Hee-Takresearcher김희탁researcher
Description
한국과학기술원 :생명화학공학과,
Publisher
한국과학기술원
Issue Date
2019
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 생명화학공학과, 2019.2,[xi, 37 p. :]

Keywords

Vanadium redox flow battery▼a$V^{3.5+}$ electrolyte▼acatalyst▼areducing agent▼acatalytic reaction; 바나듐 레독스 흐름 전지▼a3.5가 바나듐 전해질▼a촉매▼a환원제▼a촉매 반응

URI
http://hdl.handle.net/10203/266320
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=843271&flag=dissertation
Appears in Collection
CBE-Theses_Master(석사논문)
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