Identification of Degradation Reasons for a CO MEA Electrolyzer Using the Distribution of Relaxation Times Analysis.

The application of membrane electrode assembly (MEA) in electrocatalytic CO reduction (ECOR) technology is an essential step toward industrialization. Nevertheless, the issue of ECOR failure in MEA during extended operation hinders its industrial application. In this work, we employed in situ, nondestructive electrochemical impedance spectroscopy (EIS) techniques combined with distribution of relaxation times (DRT) methodology to diagnose the causes of the failure.

Tailored BiVO Photoanode Hydrophobic Microenvironment Enables Water Oxidative H O Accumulation.

Direct photoelectrochemical 2-electron water oxidation to renewable H O production on an anode increases the value of solar water splitting. BiVO has a theoretical thermodynamic activity trend toward highly selective water oxidation H O formation, but the challenges of competing 4-electron O evolution and H O decomposition reaction need to overcome. The influence of surface microenvironment has never been considered as a possible activity loss factor in the BiVO -based system.