New strategy achieves efficient and stable carbon dioxide electrolysis in solid oxide electrolysis cell

Fig. 1: Morphological study of the SFRuM catalysts. In situ secondary electron (SE)-STEM images of SFRuM after reduction at 800 °C for ~15 min (a), after reduction at 800 °C for ~30 min (b), after reoxidation at 800 °C for ~30 min (c), and after reoxidation at 800 °C for ~40 min (d). In situ SE-STEM images of SFRuM O1 after reduction at 600 °C for ~10 min (e), after reduction at 800 °C for ~10 min (f), and after reduction at 800 °C for ~60 min (g). h Magnified image of (g). Ex situ SE-STEM images of SFRuM R1 (i), SFRuM R2 (j), and SFRuM R4 (k). l Population and size distribution of metal NPs exsolved after different redox manipulations. Credit: DOI: 10.1038/s41467-021-26001-8

Solid oxide electrolysis cell (SOEC) is promising in CO2 conversion and renewable clean electricity energy storage. It can convert CO2 and H2O simultaneously into syngas or hydrocarbon fuel at the cathode, and produce high purity O2 at the anode.

Perovskite-type oxides have the advantages of excellent doping ability, carbon deposition resistance and redox stability. However, the application of perovskite electrodes is limited due to insufficient electrocatalytic activity.

Recently, researchers led by Prof. WANG Guoxiong and Prof. BAO Xinhe from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences and their collaborators achieved efficient and stable CO2 electrolysis in SOEC. They found that redox cycle manipulations promoted the exsolution of high-density metal/perovskite interfaces, which improved the CO2 electrolysis performance and stability.

This study was published in Nature Communications on Sept. 27.

The researchers prepared Ru-doped Sr2Fe1.4Ru0.1Mo0.5O6-δ (SFRuM) double perovskite. They found that the repeated redox manipulations promoted the exsolution of RuFe alloy nanoparticles from 5900 μm-2 to 22680 μm-2, where the mean particle size was between 2.2 and 2.9 nm, thus regulating the density of the [email protected] interfaces.

Combined with in situ atmosphere electron microscopy, elemental maps and electron energy loss spectroscopy, they revealed the formation and regeneration mechanism of [email protected] interface under reducing and oxidizing atmosphere. “The enrichment in Ru species on the surface can promote the exsolution of high-density [email protected] interfaces,” said Prof. WANG.

What’s more, in situ atmosphere electron microscopy, electrochemical impedance spectroscopy combined with density functional theory calculations confirmed that the [email protected] interface promoted CO2 adsorption and activation. Compared with the SFRuM cathode, the [email protected] cathode had a 74.6 percent increase in current density for CO2 electrolysis at 1.2 V and 800 °C, and exhibited a high stability of CO2 electrolysis for 1000 h.


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More information:
Houfu Lv et al, Promoting exsolution of RuFe alloy nanoparticles on Sr2Fe1.4Ru0.1Mo0.5O6−δ via repeated redox manipulations for CO2 electrolysis, Nature Communications (2021). DOI: 10.1038/s41467-021-26001-8

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New strategy achieves efficient and stable carbon dioxide electrolysis in solid oxide electrolysis cell (2021, October 8)
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