An active and durable molecular catalyst for aqueous polysulfide-based redox flow batteries

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

9 Scopus Citations
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Author(s)

  • Jiafeng Lei
  • Yanxin Yao
  • Yang Shi
  • Ka Lok Leung
  • Yi-Chun Lu

Detail(s)

Original languageEnglish
Journal / PublicationNature Energy
Online published2 Oct 2023
Publication statusOnline published - 2 Oct 2023

Abstract

Aqueous redox flow battery (RFB) is one of the most promising technologies for grid-scale energy storage systems. Polysulfides are particularly attractive active materials owing to their low cost and high capacity, but the low energy efficiency and low operating current density limit their practical applications. Here we report an active and durable molecule catalyst, riboflavin sodium phosphate (FMN-Na), to transform sluggish polysulfide reduction reactions to fast redox reactions of FMN-Na via homogeneous catalysis. The FMN-Na catalyst substantially reduces the overpotential of a polysulfide–ferrocyanide RFB (S-Fe RFB) from more than 800 mV to 241 mV at 30 mA cm2. A catalysed S-Fe flow cell was demonstrated for 2,000 cycles at 40 mA cm2 with a low decay rate of 0.00004% per cycle (0.0017% per day). A catalysed polysulfide–iodide RFB operated for 1,300 cycles under 40 mA cm2 without capacity decay. This work addresses the bottleneck of polysulfide-based RFBs for long-duration energy storage applications. © The Author(s), under exclusive licence to Springer Nature Limited 2023.

Citation Format(s)

An active and durable molecular catalyst for aqueous polysulfide-based redox flow batteries. / Lei, Jiafeng; Zhang, Yaqin; Yao, Yanxin et al.
In: Nature Energy, 02.10.2023.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review