Precipitation Recovery of VO(OH)2from Sodium Metavanadate Solution and Its Application in a Vanadium Redox Flow Battery

Hee Seo Kim, Yong Jae Suh, Dae Woo Kim, Pham Tan Thong, Ho Young Jung, Ho Seok Jeon, In Su Park, Hye Jin Hong

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The vanadium redox flow battery has received intensive attention because of the increasing demand for safe energy storage systems. Generally, V2O5is used for the preparation of a V electrolyte, but the synthesis of V2O5from V leaching solution leads to significant environmental impact and requires complicated sequential reduction processes for the preparation of the V electrolyte. For sustainable V electrolyte production, we directly recovered VO(OH)2from V leaching solution via a reduction-precipitation process using hydrazine (N2H4) as a reducing agent and used the VO(OH)2to prepare a V electrolyte. When the V concentration was 1 M, the optimal conditions for the V recovery efficiency were a N2H4/V ratio of 1, pH 4, and a reaction time of 3 h. The effect of co-existing ions (Na, Mg, K, Fe, and Al) in the NaVO3solution was also investigated. K exhibited the strongest adverse effect on the V recovery efficiency, and Fe and Al impurities were not removed from the recovered V compound by the washing process. A V electrolyte was prepared using the recovered VO(OH)2, and its charge-discharge performance was evaluated, revealing a high voltage efficiency (∼90.15% on average) and energy efficiency (∼86.79% on average) at a constant current density of 50 mA/cm2. These results demonstrate that directly using VO(OH)2to prepare a V electrolyte is a simple and cost-effective process.

Original languageEnglish
Pages (from-to)9443-9452
Number of pages10
JournalACS Sustainable Chemistry and Engineering
Volume10
Issue number29
DOIs
Publication statusPublished - 2022 Jul 25

Bibliographical note

Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Renewable Energy, Sustainability and the Environment

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