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Ultrathin multilayer Sb-SnO2/IrTaOx/TiO2 nanotube arrays as anodes for the selective oxidation of chloride ions.

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Title: Ultrathin multilayer Sb-SnO2/IrTaOx/TiO2 nanotube arrays as anodes for the selective oxidation of chloride ions.
Authors: Lee, Yebin1 (AUTHOR), Park, Yiseul1 (AUTHOR) dewpark@pknu.ac.kr
Source: Journal of Alloys & Compounds. Nov2020, Vol. 840, pN.PAG-N.PAG. 1p.
Subjects: Chloride ions, Anodes, Oxidation, Oxygen evolution reactions, Precious metals, Hypochlorites, Electroforming, Carbon dioxide reduction
Abstract: The oxidation of chloride ions (Cl−) to oxidized chlorine species (chlorine/hypochlorous acid/hypochlorite) is emerging as a promising alternative to the oxygen evolution reaction because it has a lower overpotential than the latter, and can also produce value-added anodic products. Here, an ultrathin multilayer electrode (Sb-SnO 2 /IrTaO x /TiO 2 nanotube (TNT)) has been fabricated by simple dipping and electrodeposition methods for the production of hypochlorous acid by Cl− oxidation. The use of non-noble metal-based electrodes significantly reduced the use of noble metals and increased the selectivity for Cl− oxidation even at the neutral pH and low concentration of NaCl, resulting in the reduction of cost and energy consumption. The nanotube structure of Sb-SnO 2 /IrTaO x /TNT affords an increased active surface area and loading amounts of the catalysts compared to the structure of the flat electrodes, making the Sb-SnO 2 /IrTaO x /TNT more efficient than flat electrodes for Cl− oxidation. The Faradaic efficiency of Sb-SnO 2 /IrTaO x /TNT for Cl− oxidation was ∼95%, indicating that water oxidation was almost suppressed. Compared to the commercial dimensionally stable anode (DSA), the overpotential of Sb-SnO 2 /IrTaO x /TNT for water oxidation is much larger than for Cl− oxidation, therefore, the Sb-SnO 2 /IrTaO x /TNT could exhibit the high selectivity for Cl− oxidation by suppressing the competitive water oxidation. Image 1 • Ultrathin multilayer electrode has been fabricated as an anode for Cl− oxidation. • Sb-SnO 2 /IrTaO x /TiO 2 nanotube reduced the use of noble metals. • Sb-SnO 2 catalyst layer increased the selectivity for Cl− oxidation at neutral pH. • The Faradaic efficiency for Cl− oxidation was ∼95% by suppressing water oxidation at neutral pH. [ABSTRACT FROM AUTHOR]
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Abstract:The oxidation of chloride ions (Cl−) to oxidized chlorine species (chlorine/hypochlorous acid/hypochlorite) is emerging as a promising alternative to the oxygen evolution reaction because it has a lower overpotential than the latter, and can also produce value-added anodic products. Here, an ultrathin multilayer electrode (Sb-SnO 2 /IrTaO x /TiO 2 nanotube (TNT)) has been fabricated by simple dipping and electrodeposition methods for the production of hypochlorous acid by Cl− oxidation. The use of non-noble metal-based electrodes significantly reduced the use of noble metals and increased the selectivity for Cl− oxidation even at the neutral pH and low concentration of NaCl, resulting in the reduction of cost and energy consumption. The nanotube structure of Sb-SnO 2 /IrTaO x /TNT affords an increased active surface area and loading amounts of the catalysts compared to the structure of the flat electrodes, making the Sb-SnO 2 /IrTaO x /TNT more efficient than flat electrodes for Cl− oxidation. The Faradaic efficiency of Sb-SnO 2 /IrTaO x /TNT for Cl− oxidation was ∼95%, indicating that water oxidation was almost suppressed. Compared to the commercial dimensionally stable anode (DSA), the overpotential of Sb-SnO 2 /IrTaO x /TNT for water oxidation is much larger than for Cl− oxidation, therefore, the Sb-SnO 2 /IrTaO x /TNT could exhibit the high selectivity for Cl− oxidation by suppressing the competitive water oxidation. Image 1 • Ultrathin multilayer electrode has been fabricated as an anode for Cl− oxidation. • Sb-SnO 2 /IrTaO x /TiO 2 nanotube reduced the use of noble metals. • Sb-SnO 2 catalyst layer increased the selectivity for Cl− oxidation at neutral pH. • The Faradaic efficiency for Cl− oxidation was ∼95% by suppressing water oxidation at neutral pH. [ABSTRACT FROM AUTHOR]
ISSN:09258388
DOI:10.1016/j.jallcom.2020.155622