Issue 48, 2022, Issue in Progress

Water splitting by MnFe2O4/Na2CO3 reversible redox reactions

Abstract

Future energy systems must call upon clean and renewable sources capable of reducing associated CO2 emissions. The present research opens new perspectives for renewable energy-based hydrogen production by water splitting using metal oxide oxidation/reduction reactants. An earlier multicriteria assessment defined top priorities, with MnFe2O4/Na2CO3/H2O and Mn3O4/MnO/NaMnO2/H2O multistep redox cycles having the highest potential. The latter redox system was previously assessed and proven difficult to be conducted. The former redox system was hence experimentally investigated in the present research at the 0.5 to 250 g scale in isothermal thermogravimetry, an electrically heated furnace, and a concentrated solar reactor. Over 30 successive oxidation/reduction cycles were assessed, and the H2 production efficiencies exceeded 98 % for the coprecipitated reactant after these multiple cycles. Tentative economics using a coprecipitated reactant revealed that 120 cycles are needed to achieve a 1 € per kg H2 cost. Improving the cheaper ball-milled reactant could reduce costs by approximately 30 %. The initial results confirm that future research is important.

Graphical abstract: Water splitting by MnFe2O4/Na2CO3 reversible redox reactions

Supplementary files

Article information

Article type
Paper
Submitted
24 Aug 2022
Accepted
05 Oct 2022
First published
02 Nov 2022
This article is Open Access
Creative Commons BY license

RSC Adv., 2022,12, 31392-31401

Water splitting by MnFe2O4/Na2CO3 reversible redox reactions

Y. Deng, S. Li, R. Dewil, L. Appels, M. Yang, H. Zhang and J. Baeyens, RSC Adv., 2022, 12, 31392 DOI: 10.1039/D2RA05319E

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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