Abstract
AbstractGas diffusion electrodes, made of PTFE‐bonded carbon with precious metal catalysts, were investigated as hydrogen consuming anodes in sodium sulphate electrolysis. The catalysts used were platinum and palladium and mixtures of both metals, prepared by two different methods. Various metal meshes were used as current collector. The electrodes performed well in pure sulphuric acid (5–15 wt‐%) and in mixtures with sodium sulphate (10 wt‐%) at temperatures of 30 to 70°C and current densities up to 5 kA/m2. In long‐term experiments, at a current density of 2.6 kA/m2, the electrodes were stable over three months. The electrodes were characterised by stationary current density/potential curves and by galvanostatic current interruption measurements.
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