In-situ Observation of the Degradation of All-Vanadium Redox Flow Batteries with Dynamic Hydrogen Reference Electrode under Real Operation Conditions

Publication date: Available online 8 November 2018Source: Journal of Industrial and Engineering ChemistryAuthor(s): Chanyong Choi, Soohyun Kim, Riyul Kim, Juhyuk Lee, Jiyun Heo, Hee-Tak KimAbstractTo identify the major degradation mechanism of vanadium redox flow batteries (VRFBs) during cycling under practical operation conditions, an electrochemical impedance analysis is conducted by using dynamic hydrogen electrode (DHE) as a reference electrode. The increased ohmic resistance and charge transfer resistances of the electrodes with cycling are responsible for the performance fade. Spectroscopic and postmortem analysis indicate that the degradation of the carbon felt electrode, which lowers surface conductivity, results in the increases in ohmic and charge transfer resistances. Therefore, the chemical stability of should be improved for achieving more durable VRFBs.Graphical abstract

Source: Journal of Industrial and Engineering Chemistry - November 9, 2018 Category: Chemistry Source Type: research