Abstract
An issue with conventional vanadium redox flow batteries (VRFB) with Nafion membranes is the crossover of vanadium ions, resulting in low coulombic efficiency and rapid decay in capacity. In this work, a VRFB with a polybenzimidazole (PBI) membrane is tested and compared with the Nafion system. Results show that the PBI-based VRFB exhibits a substantially higher coulombic efficiency of up to 99% at current densities ranging from 20 mA cm-2to 80 mA cm-2. More importantly, it is demonstrated that the PBI-based VRFB has a capacity decay rate of as low as 0.3% per cycle, which is four times lower than that of the Nafion system (1.3% per cycle). The improved coulombic efficiency and cycling performance are attributed to the low crossover of vanadium ions through the PBI membrane.
Original language | English |
---|---|
Pages (from-to) | 492-498 |
Number of pages | 7 |
Journal | Electrochimica Acta |
Volume | 153 |
DOIs | |
Publication status | Published - 20 Jan 2015 |
Externally published | Yes |
Keywords
- Flow battery
- Polybenzimidazole membrane
- vanadium redox flow battery
ASJC Scopus subject areas
- General Chemical Engineering
- Electrochemistry