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Symmetrical Exsolution of Rh Nanoparticles in Solid Oxide Cells for Efficient Syngas Production from Greenhouse Gases

Lookup NU author(s): Dr Dragos Neagu, George Zafeiropoulos, Chenyang Tang, Dr Kelly Kousi, Professor Ian Metcalfe

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by American Chemical Society, 2019.

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Abstract

Carbon dioxide and steam solid oxide co-electrolysis is a key technology for exploiting renewable electricity to generate syngas feedstock for the Fischer–Tropsch synthesis. The integration of this process with methane partial oxidation in a single cell can eliminate or even reverse the electrical power demands of co-electrolysis, while simultaneously producing syngas at industrially attractive H2/CO ratios. Nevertheless, this system is rather complex and requires catalytically active and coke tolerant electrodes. Here, we report on a low-substitution rhodium-titanate perovskite (La0.43Ca0.37Rh0.06Ti0.94O3) electrode for the process, capable of exsolving high Rh nanoparticle populations, and assembled in a symmetrical solid oxide cell configuration. By introducing dry methane to the anode compartment, the electricity demands are impressively decreased, even allowing syngas and electricity cogeneration. To provide further insight on the Rh nanoparticles role on methane-to-syngas conversion, we adjusted their size and population by altering the reduction temperature of the perovskite. Our results exemplify how the exsolution concept can be employed to efficiently exploit noble metals for activating low-reactivity greenhouse gases in challenging energy-related applications.


Publication metadata

Author(s): Kyriakou V, Neagu D, Zafeiropoulos G, Sharma RK, Tang C, Kousi K, Metcalfe I

Publication type: Article

Publication status: Published

Journal: ACS Catalysis

Year: 2019

Volume: 100

Issue: 2

Pages: 1278-1288

Print publication date: 17/01/2020

Online publication date: 16/12/2019

Acceptance date: 12/12/2019

Date deposited: 27/01/2020

ISSN (electronic): 2155-5435

Publisher: American Chemical Society

URL: https://doi.org/10.1021/acscatal.9b04424

DOI: 10.1021/acscatal.9b04424


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