Electrochemical Mechanisms in Chlorate Production Systems
Summary
The electrolytic production of sodium chlorate is founded on the oxidation of chloride ions at dimensionally stable anodes to generate hypochlorite, which undergoes homogeneous disproportionation to chlorate. At the cathode, the desired hydrogen evolution reaction competes with the reduction of hypochlorite or chlorate, leading to energy losses and decreased selectivity. High Faradaic efficiencies are achieved by optimising electrode materials, electrolyte composition and operating conditions to suppress side reactions. Additives such as chromium(VI), molybdate or emerging membrane coatings modulate surface chemistry and ion transport, enhancing cathodic selectivity and stability. Advances in electrode design, including ion exchange polymer layers and doped oxide films, have improved current efficiencies while addressing environmental and safety concerns associated with toxic additives. This mechanistic control underpins global demand for efficient, sustainable chlorate production for applications in pulp bleaching and disinfectant manufacture.
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Electrochemical Mechanisms in Chlorate Production Systems publication trend
The graph below shows the total number of articles in electrochemical mechanisms in chlorate production systems across all publications each year (not limited to Nature Index journals).
Technical terms
Faradaic efficiency: The fraction of electrical charge that drives the target electrochemical reaction relative to total charge passed.
Hydrogen evolution reaction (HER): The electrochemical production of hydrogen at the cathode by water reduction.
Hypochlorite reduction: A side reaction in chlorate cells where hypochlorite is reduced at the cathode, lowering overall efficiency.
Membrane-coated cathode: A cathode modified with thin ion-exchange polymer layers to selectively block anionic intermediates.
Cathodic selectivity: The preference for a desired cathodic reaction, such as hydrogen evolution, over competing pathways.
References
- Rational design of a membrane-coated cathode for selective electrochemical hydrogen evolution in chlorate electrolysis. Electrochimica Acta (2023).
- Mixed Chromate and Molybdate Additives for Cathodic Enhancement in the Chlorate Process. Electrocatalysis (2021).
- Pilot-scale study of membrane-coated cathodes: Achieving high cathodic efficiency and outstanding stability in chlorate electrolysis. Electrochimica Acta (2024).
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