Molybdenum-assisted reduction of VO2+ for low cost electrolytes of vanadium redox flow batteries

Abstract

Efficient and affordable energy storage systems are indispensable to accomplish a successful energy transition from fossil fuels to renewable sources. Although all-vanadium redox flow batteries (VRFB) possess many distinctive advantages, much improvement in the process for electrolyte preparation is needed to overcome low productivity and complexity of the current electrolysis process. Herein, we demonstrate a simple one-pot process for the preparation of V3.5+ electrolytes from V2O5 by utilizing hydrazine monohydrate as a residue-free reducing agent and molybdenum as a homogeneous catalyst accelerating the reduction of VO2+. It is confirmed that the performance of the electrolytes prepared by the newly developed process is identical to that by electrolysis in terms of charge-discharge efficiency and capacity up to current density of 200 mA cm-2. This study can contribute to the wide spread of VRFB by providing a scalable process suitable for the mass production of V3.5+ electrolyte.

Structure, sequence and phylogenetic analysis of the complete chloroplast genome of the brown algae Saccharina sp. ye-E (Laminariaceae: Phaeophyceae) from Sakhalin Oblast, Russia

“…It is also highly valued in China, Japan, and Korea due to its commercial use as a raw material in food and industry. 1,2 The degradation of Saccharina kelp forests is one of the most pressing threats to coastal ecosystems. Loss and decline of kelp forests have been reported in temperate, boreal, and arctic regions.…”