High-Efficiency Solar Desalination Accompanying Electrocatalytic Conversions of Desalted Chloride and Captured Carbon Dioxide

Kim, BJ; Piao, G; Kim, S; Yang, SY; Park, Y; Han, DS; Shon, HK; Hoffmann, MR; Park, H

High-Efficiency Solar Desalination Accompanying Electrocatalytic Conversions of Desalted Chloride and Captured Carbon Dioxide

Kim, BJ Piao, G Kim, S Yang, SY Park, Y Han, DS Shon, HK

Hoffmann, MR Park, H

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Publication Type:: Journal Article
Citation:: ACS Sustainable Chemistry and Engineering, 2019, 7 (18), pp. 15320 - 15328
Issue Date:: 2019-09-16

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Field	Value	Language
dc.contributor.author	Kim, BJ	en_US
dc.contributor.author	Piao, G	en_US
dc.contributor.author	Kim, S	en_US
dc.contributor.author	Yang, SY	en_US
dc.contributor.author	Park, Y	en_US
dc.contributor.author	Han, DS	en_US
dc.contributor.author	Shon, HK https://orcid.org/0000-0002-3777-7169	en_US
dc.contributor.author	Hoffmann, MR	en_US
dc.contributor.author	Park, H	en_US
dc.date.issued	2019-09-16	en_US
dc.identifier.citation	ACS Sustainable Chemistry and Engineering, 2019, 7 (18), pp. 15320 - 15328	en_US
dc.identifier.uri	http://hdl.handle.net/10453/138717
dc.description.abstract	© 2019 American Chemical Society. The sustainability of conventional water- and energy-associated systems is being examined in terms of water-energy nexus. This study presents a high-efficiency, off-grid solar desalination system for saline water (salinities 10 and 36 g L-1) that accompanies electrocatalytic oxidations of chloride and, consequently, urine via oxidized chlorine species while concomitantly producing formate from captured CO2. A variable number of desalination cell arrays is placed between a double-layered nanoparticulate titania electrocatalyst (Ti/IrxTa1-xOy/nano-TiO2; denoted as n-TEC) anode and a porous dendrite Bi cathode. A potential bias to the n-TEC and Bi pairs initiates the transport of chloride and sodium ions in the saline water to the anode and cathode cells, respectively, at an ion transport efficiency of ∼100% and a specific energy consumption of ∼1.9 kWh m-3. During the desalination, the n-TEC anode catalyzes the conversion of the transported chloride into reactive chlorine species, which, in turn, mediate the decomposition of urine in the anode cell. Concurrent with the anodic process, formate is continuously produced at a faradic efficiency of >95% from the CO2 captured in the catholyte. When a photovoltaic cell (power conversion efficiency of ∼18%) is coupled to the stack device with five desalination cells, the three independent processes synergistically proceed at a maximum overall solar-to-desalination system efficiency of ∼16% and a maximum solar-to-formate chemical energy conversion efficiency of ∼7%.	en_US
dc.relation.ispartof	ACS Sustainable Chemistry and Engineering	en_US
dc.relation.isbasedon	10.1021/acssuschemeng.9b02640	en_US
dc.title	High-Efficiency Solar Desalination Accompanying Electrocatalytic Conversions of Desalted Chloride and Captured Carbon Dioxide	en_US
dc.type	Journal Article
utslib.citation.volume	18	en_US
utslib.citation.volume	7	en_US
utslib.for	0301 Analytical Chemistry	en_US
utslib.for	0502 Environmental Science and Management	en_US
utslib.for	0904 Chemical Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	closed_access
pubs.issue	18	en_US
pubs.publication-status	Published	en_US
pubs.volume	7	en_US

Abstract:

© 2019 American Chemical Society. The sustainability of conventional water- and energy-associated systems is being examined in terms of water-energy nexus. This study presents a high-efficiency, off-grid solar desalination system for saline water (salinities 10 and 36 g L-1) that accompanies electrocatalytic oxidations of chloride and, consequently, urine via oxidized chlorine species while concomitantly producing formate from captured CO2. A variable number of desalination cell arrays is placed between a double-layered nanoparticulate titania electrocatalyst (Ti/IrxTa1-xOy/nano-TiO2; denoted as n-TEC) anode and a porous dendrite Bi cathode. A potential bias to the n-TEC and Bi pairs initiates the transport of chloride and sodium ions in the saline water to the anode and cathode cells, respectively, at an ion transport efficiency of ∼100% and a specific energy consumption of ∼1.9 kWh m-3. During the desalination, the n-TEC anode catalyzes the conversion of the transported chloride into reactive chlorine species, which, in turn, mediate the decomposition of urine in the anode cell. Concurrent with the anodic process, formate is continuously produced at a faradic efficiency of >95% from the CO2 captured in the catholyte. When a photovoltaic cell (power conversion efficiency of ∼18%) is coupled to the stack device with five desalination cells, the three independent processes synergistically proceed at a maximum overall solar-to-desalination system efficiency of ∼16% and a maximum solar-to-formate chemical energy conversion efficiency of ∼7%.

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http://hdl.handle.net/10453/138717