Mehmood, Asad Jang, Eunjin Lee, Nakwon Jung, Kwang-Deog Ha, Heung Yong 2024-01-20T06:01:09Z 2024-01-20T06:01:09Z 2021-09-05 2015-10-20 0013-4686 https://pubs.kist.re.kr/handle/201004/124876 In this study, we report development of a compact continuous-flow electrochemical cell for an energy-efficient splitting of brine (aqueous NaCl) to yield alkali (NaOH) that would be used for sequestration of carbon dioxide into carbonate minerals at a subsequent stage. Herein, at the first step of process development, cell design and electrode structures are optimized for producing NaOH with minimum input energy. Two cell designs representing a primitive version (design 1) and an advanced version (design 2) are evaluated. The advanced structure of electrochemical cell with a thinner middle compartment exhibits up to 300% improvement in output current density as compared to the primitive version due to shorter ionic diffusion paths. Structural modifications of the anode lead to a successful reduction of Pt loadings by an appreciable amount of 75% without compromising the cell performance. Pt black as a cathode catalyst shows a significantly better performance stability as compared to Pt/C, which experiences a sharp performance decline in a 50 h steady-state operation. It has been demonstrated that the compact structure of electrochemical cell allows use of a highly diluted NaOH solution (0.1 M) as catholyte without deteriorating the cell performance and stability. Finally, caustic efficiency and different figures of merit are calculated. (C) 2015 Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD CARBON-DIOXIDE CO2 CAPTURE CONVERSION FORMATE VOLTAGE LAYER Development of a compact continuous-flow electrochemical cell for an energy efficient production of alkali Article 10.1016/j.electacta.2015.09.007 1 ELECTROCHIMICA ACTA, v.180, pp.845 - 851 ELECTROCHIMICA ACTA 180 845 851 scie scopus 000363345100101 2-s2.0-84941703012 Electrochemistry Electrochemistry Article CARBON-DIOXIDE CO2 CAPTURE CONVERSION FORMATE VOLTAGE LAYER Brine electrolysis CO2 sequestration Carbonate minerals Alkali production Structural compactness