Differential Electrochemical Mass Spectrometry of Carbon Felt Electrodes for Vanadium Redox Flow Batteries

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High Resolution Image Download MS PowerPoint Slide We successfully conducted electrochemical and online mass spectrometric measurements on commercial carbon felt electrodes with a differential electrochemical spectrometry setup. Its capability is demonstrated by simultaneous mass spectrometric and electrochemical measurements. Half-cell tests, such as cyclic voltammetry, and coulometry of the redox couples can be performed under stopped flow of the electrolyte. We use different potential windows, and two types of electrolytes while monitoring potential dependent H 2, O 2 and CO 2 formation. At oxidizing potentials, we did not observe oxygen evolution, only carbon corrosion. An increase in CO 2 and H 2 formation at high and low potentials in the presence of vanadium is observed.