Solid oxide electrolysis cell (SOEC) is promising in CO 2 conversion and renewable clean electricity energy storage. It can convert CO 2 and H 2 O simultaneously into syngas or hydrocarbon fuel at the cathode, and produce high purity O 2 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 CO 2 electrolysis in SOEC. They found that redox cycle manipulations promoted the exsolution of high-density metal/perovskite interfaces, which improved the CO 2 electrolysis performance and stability.
This study was published in Nature Communications on Sept. 27.
The researchers prepared Ru-doped Sr 2 Fe 1.4 Ru 0.1 Mo 0.5 O 6-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 RuFe@SFRuM interfaces.
Combined with in situ atmosphere electron microscopy, elemental maps and electron energy loss spectroscopy, they revealed the formation and regeneration mechanism of RuFe@SFRuM interface under reducing and oxidizing atmosphere. "The enrichment in Ru species on the surface can promote the exsolution of high-density RuFe@SFRuM interfaces," said Prof. WANG.
What's more, in situ atmosphere electron microscopy, electrochemical impedance spectroscopy combined with density functional theory calculations confirmed that the RuFe@SFRuM interface promoted CO 2 adsorption and activation. Compared with the SFRuM cathode, the RuFe@SFRuM cathode had a 74.6% increase in current density for CO 2 electrolysis at 1.2 V and 800 °C, and exhibited a high stability of CO 2 electrolysis for 1000 h.
The above work was supported by the National Natural Science Foundation of China, the National Key Research and Development Program, and the Youth Innovation Promotion Association of the Chinese Academy of Sciences.
Nature Communications
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Promoting exsolution of RuFe alloy nanoparticles on Sr2Fe1.4Ru0.1Mo0.5O6−δ via repeated redox manipulations for CO2 electrolysis
27-Sep-2021