Investigation and Optimisation of Operating Conditions for Low-Temperature CO₂ Reduction to CO in a Forward-Bias Bipolar-Membrane Electrolyser

The most recent investigations of operating conditions in a forward-bias bipolar-membrane zero-gap electrolyser using silver cathode catalyst for the reduction CO 2 to at low temperatures and near-ambient pressures are reported. First, performance was investigated as function feed humidification composition. highest partial current density 127 mA cm ?2 , which obtained an iR-corrected cell voltage 2.9 V, 50%RH, concentration 90% Faradaic efficiency 93%. cells were tested continuously 12 h 3 V 8 3.4 investigate system stability. While efficiencies maintained during measurements 3.0 shift selectivity observed while deterioration densities occurred both cases. Using specially designed electrochemical with integrated reversible hydrogen reference electrode, it found that is main responsible loss performance. It furthermore determined via post-mortem SEM EDX caused by agglomeration surface poisoning.