Impact of Power Converter Current Ripple on the Degradation of PEM Electrolyzer Performances.

In this study, an endurance test of 3000 h was conducted on four equivalent proton exchange membrane (PEM) electrolyzers to identify and quantify the impact of an electric ripple current on their durability. Three different typical power converter waveforms and frequencies were explored. Signals were added to the same direct current carrier and also tested for reference.

Iron Porphyrin Allows Fast and Selective Electrocatalytic Conversion of CO to CO in a Flow Cell.

Molecular catalysts have been shown to have high selectivity for CO electrochemical reduction to CO, but with current densities significantly below those obtained with solid-state materials. By depositing a simple Fe porphyrin mixed with carbon black onto a carbon paper support, it was possible to obtain a catalytic material that could be used in a flow cell for fast and selective conversion of CO to CO. At neutral pH (7.