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Industrial chlor-alkali electrolysis represents one of the most energy- and resource-intensive technological applications of electrocatalysis. Improving process efficiency becomes a critical issue for the sustainable development and for alleviating the energy and environmental crisis. Rational design in the morphology of RuO2-based anodic electrocatalytic coatings and the control in the coating microstructure can contribute to massive energy saving compared to the current commercial Ru0.3Ti0.7O2 coating. This review covers recent developments in the anodic coatings. Performance enhancement for RuO2-based anodic coatings is achieved by using alternative preparation routes of sol-gel and electrodeposition. The target control in the coating surface morphologies and the increase in the utilization of active Ru species are demonstrated.

Herein, we report the use of alkyl ammonium chloride salts as safe and sustainable chlorine storage media. The most promising candidate, [NEt3Me]­Cl, stores up to 0.79 kg chlorine/kg storage material, is readily prepared, and stable against chlorination for extended times. Chlorine release can be achieved by applying heat or vacuum, or, alternatively, by the addition of water. The combination of these properties emphasizes [NEt3Me]Cl as a suitable storage medium to facilitate the flexibilization of industrial chlorine production. As polychlorides can be used for various chlorination reactions, a combined industrial process is envisaged utilizing [NEt3Me]Cl as the storage medium and the loaded system, [NEt3Me]­[Cl­(Cl2) n ] (n = 1.68), as the reagent for industrial chlorinations.

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