CaltechAUTHORS
  A Caltech Library Service

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

Kim, Byeong-ju and Piao, Guangxia and Kim, Seonghun and Yang, So Young and Park, Yiseul and Han, Dong Suk and Shon, Ho Kyong and Hoffmann, Michael R. and Park, Hyunwoong (2019) High Efficiency Solar Desalination Accompanying Electrocatalytic Conversions of Desalted Chloride and Captured Carbon Dioxide. ACS Sustainable Chemistry & Engineering, 7 (18). pp. 15320-15328. ISSN 2168-0485. https://resolver.caltech.edu/CaltechAUTHORS:20190816-135100362

[img] PDF - Accepted Version
See Usage Policy.

754Kb
[img] PDF (Efficiency estimation, XRD spectrum of as-synthesized n-TEC electrode, XPS spectra of an n-TEC electrode for Ti 2p and O 1s bands, linear sweep voltammograms, time changes of total/free chlorines, SEM, EPMA, electrocatalysis, desalination, hybrid reaction) - Supplemental Material
See Usage Policy.

1220Kb

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20190816-135100362

Abstract

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 CO_2. A variable number of desalination cell arrays is placed between a double-layered nanoparticulate titania electrocatalyst (Ti/Ir_xTa_(1–x)O_y/nano-TiO_2; 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 CO_2 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%.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1021/acssuschemeng.9b02640DOIArticle
ORCID:
AuthorORCID
Kim, Byeong-ju0000-0002-0807-4878
Piao, Guangxia0000-0003-4415-5461
Kim, Seonghun0000-0001-5474-4249
Yang, So Young0000-0002-1783-0276
Park, Yiseul0000-0003-3256-1032
Han, Dong Suk0000-0002-4804-5369
Shon, Ho Kyong0000-0002-3777-7169
Hoffmann, Michael R.0000-0001-6495-1946
Park, Hyunwoong0000-0002-4938-6907
Additional Information:© 2019 American Chemical Society. Received: May 11, 2019; Revised: July 24, 2019; Published: August 16, 2019. The authors are grateful to the Korea CCS R&D Center (KCRC) (no. 2014M1A8A1049354) for financial support. This research was partly supported by the National Research Foundation of Korea (2019R1A2C2002602, 2018R1A6A1A03024962, and 2019M1A2A2065616). S.Y.Y. is grateful to the NRF (2017R1C1B1005179). Y.P. is grateful to the Next-Generation Carbon Upcycling Project (2017M1A2A2043123). This publication was made possible by a grant from the Qatar National Research Fund under its National Priorities Research Program (NPRP 10-1210-160019). Author Contributions: B.-j.K., G.P., S.K., and H.P. designed and performed experiments; S.Y.Y., Y.P., D.S.H., H.K.S., and M.R.H. discussed the experimental results; and H.P. wrote this manuscript. The authors declare no competing financial interest.
Funders:
Funding AgencyGrant Number
Korea CCS R&D Center (KCRC)2014M1A8A1049354
National Research Foundation of Korea2019R1A2C2002602
National Research Foundation of Korea2018R1A6A1A03024962
National Research Foundation of Korea2019M1A2A2065616
Ministry of Environment (Korea)YL-WE-17-001
National Research Foundation of Korea2017R1C1B1005179
National Research Foundation of Korea2017M1A2A2043123
Qatar National Research FundNPRP 10-1210-160019
Subject Keywords:Water-energy nexus; Electrocatalysis; Reactive chlorine species; CO2 reduction; Desalination
Issue or Number:18
Record Number:CaltechAUTHORS:20190816-135100362
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190816-135100362
Official Citation:High-Efficiency Solar Desalination Accompanying Electrocatalytic Conversions of Desalted Chloride and Captured Carbon Dioxide. Byeong-ju Kim, Guangxia Piao, Seonghun Kim, So Young Yang, Yiseul Park, Dong Suk Han, Ho Kyong Shon, Michael R. Hoffmann, and Hyunwoong Park. ACS Sustainable Chemistry & Engineering 2019 7 (18), 15320-15328. DOI: 10.1021/acssuschemeng.9b02640
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97956
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:16 Aug 2019 20:59
Last Modified:03 Mar 2020 13:01

Repository Staff Only: item control page