Direct anodic hydrochloric acid and cathodic caustic production during water electrolysis

Lin, Hui-Wen, Cejudo-Marin, Rocio, Jeremiasse, Adriaan W., Rabaey, Korneel, Yuan, Zhiguo and Pikaar, Ilje (2016) Direct anodic hydrochloric acid and cathodic caustic production during water electrolysis. Scientific Reports, 6 Art No.: 20494: . doi:10.1038/srep20494


Author Lin, Hui-Wen
Cejudo-Marin, Rocio
Jeremiasse, Adriaan W.
Rabaey, Korneel
Yuan, Zhiguo
Pikaar, Ilje
Title Direct anodic hydrochloric acid and cathodic caustic production during water electrolysis
Journal name Scientific Reports   Check publisher's open access policy
ISSN 2045-2322
Publication date 2016-02-05
Sub-type Article (original research)
DOI 10.1038/srep20494
Open Access Status DOI
Volume 6
Issue Art No.: 20494
Total pages 4
Place of publication London, United Kingdom
Publisher Nature Publishing Group
Collection year 2017
Language eng
Subject 1000 General
Formatted abstract
Hydrochloric acid (HCl) and caustic (NaOH) are among the most widely used chemicals by the water industry. Direct anodic electrochemical HCl production by water electrolysis has not been successful as current commercially available electrodes are prone to chlorine formation. This study presents an innovative technology simultaneously generating HCl and NaOH from NaCl using a Mn0.84Mo0.16O2.23 oxygen evolution electrode during water electrolysis. The results showed that protons could be anodically generated at a high Coulombic efficiency (i.e. ≥ 95%) with chlorine formation accounting for 3 ~ 5% of the charge supplied. HCl was anodically produced at moderate strengths at a CE of 65 ± 4% together with a CE of 89 ± 1% for cathodic caustic production. The reduction in CE for HCl generation was caused by proton cross-over from the anode to the middle compartment. Overall, this study showed the potential of simultaneous HCl and NaOH generation from NaCl and represents a major step forward for the water industry towards on-site production of HCl and NaOH. In this study, artificial brine was used as a source of sodium and chloride ions. In theory, artificial brine could be replaced by saline waste streams such as Reverse Osmosis Concentrate (ROC), turning ROC into a valuable resource.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
HERDC Pre-Audit
Advanced Water Management Centre Publications
 
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