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Spinel Metal Oxide-Alkali Carbonate-Based, Low-Temperature Thermochemical Cycles for Water Splitting and CO_2 Reduction

Xu, Bingjun and Bhawe, Yashodhan and Davis, Mark E. (2013) Spinel Metal Oxide-Alkali Carbonate-Based, Low-Temperature Thermochemical Cycles for Water Splitting and CO_2 Reduction. Chemistry of Materials, 25 (9). pp. 1564-1571. ISSN 0897-4756. https://resolver.caltech.edu/CaltechAUTHORS:20130712-102141329

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Abstract

A manganese oxide-based, thermochemical cycle for water splitting below 1000 °C has recently been reported. The cycle involves the shuttling of Na+ into and out of manganese oxides via the consumption and formation of sodium carbonate, respectively. Here, we explore the combinations of three spinel metal oxides and three alkali carbonates in thermochemical cycles for water splitting and CO_2 reduction. Hydrogen evolution and CO_2 reduction reactions of metal oxides with a given alkali carbonate occur in the following order of decreasing activity: Fe_(3)O_4 > Mn_(3)O_4 > Co_(3)O_4, whereas the reactivity of a given metal oxide with alkali carbonates declines as Li_(2)CO_3 > Na_(2)CO_3 > K_(2)CO_3. While hydrogen evolution and CO_2 reduction reactions occur at a lower temperature on the combinations with the more reactive metal oxide and alkali carbonate, higher thermal reduction temperatures and more difficult alkali ion extractions are observed for the combinations of the more reactive metal oxides and alkali carbonates. Thus, for a thermochemical cycle to be closed at low temperatures, all three reactions of hydrogen evolution (CO_2 reduction), alkali ion extraction, and thermal reduction must proceed within the specified temperature range. Of the systems investigated here, only the Na_(2)CO_3/Mn_(3)O_4 combination satisfies these criteria with a maximum operating temperature (850 °C) below 1000 °C.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/cm3038747DOIArticle
http://pubs.acs.org/doi/abs/10.1021/cm3038747PublisherArticle
Additional Information:© 2013 American Chemical Society. Received: November 30, 2012; Revised: March 19, 2013; Published: March 20, 2013. Financial support of this work was provided by a donation from Mr. and Mrs. Lewis W. van Amerongen. The authors would like to thank Dr. J. Labinger for helpful discussions of this work.
Funders:
Funding AgencyGrant Number
Mr. and Mrs. Lewis W. van AmerongenUNSPECIFIED
Subject Keywords:thermochemical cycle; water splitting; CO2 reduction; spinel metal oxide; alkali carbonate
Issue or Number:9
Record Number:CaltechAUTHORS:20130712-102141329
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130712-102141329
Official Citation:Spinel Metal Oxide-Alkali Carbonate-Based, Low-Temperature Thermochemical Cycles for Water Splitting and CO2 Reduction Bingjun Xu, Yashodhan Bhawe, and Mark E. Davis Chemistry of Materials 2013 25 (9), 1564-1571
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39337
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:12 Jul 2013 22:33
Last Modified:03 Oct 2019 05:06

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