Enhancing CO2 electrolysis performance in solid oxide electrolysis cell using La-doped SrTiO3-δ composites

IF 14.2 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY Composites Part B: Engineering Pub Date : 2025-05-01 Epub Date: 2025-02-11 DOI:10.1016/j.compositesb.2025.112261

Xiaoyong Xu , Xu Han , Haobo Li , Abel Santos , Jie Zhao , Shintaro Idab

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Abstract

Electrochemically reducing carbon dioxide by solid oxide electrolysis cells (SOECs) is a promising approach to minimize greenhouse gas emissions and generate high added value chemicals and fuels using renewable energy. However, the practical use of CO₂ electrolysis in SOECs faces challenges because of the scarcity of effective and stable cathode materials. This study explores La-doped SrTiO_3-δ composites as cathode materials for CO₂ electrolysis. By judiciously adjusting the La/Sr ratio, the perovskite structure's oxygen vacancies, lattice oxygen formation, and the content of Sr on the surface, a high CO₂ reduction activity is achieved. These adjustments enhance CO₂ adsorption and dissociation, leading to an improvement of catalytic activity and operational stability. La_0.4Sr_0.5TiO_3-δ shows a significantly enhanced CO₂ electrolysis performance with a high Faraday efficiency, a current density of 0.64 A cm⁻² at 850 °C and over 140 h of stability. The evaluation of various La-doped SrTiO_3-δ composites highlights their potential as efficient cathode materials for CO₂ electrolysis in SOECs.

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la掺杂SrTiO3-δ复合材料在固体氧化物电解池中提高CO2电解性能

固体氧化物电解电池（SOECs）电化学还原二氧化碳是一种很有前途的方法，可以最大限度地减少温室气体排放，并利用可再生能源生产高附加值的化学品和燃料。然而，由于缺乏有效和稳定的阴极材料，二氧化碳电解在soec中的实际应用面临着挑战。本研究探索了la掺杂SrTiO3-δ复合材料作为CO2电解正极材料。通过合理调整La/Sr比、钙钛矿结构的氧空位、晶格氧形成和表面Sr含量，可以获得较高的CO2还原活性。这些调整增强了CO2的吸附和解离，从而提高了催化活性和操作稳定性。La0.4Sr0.5TiO3-δ具有较高的法拉第效率，850℃下电流密度为0.64 a cm−2，稳定性超过140 h，显著提高了CO2电解性能。各种la掺杂SrTiO3-δ复合材料的评价突出了它们作为soec中CO2电解高效正极材料的潜力。

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来源期刊

Composites Part B: Engineering 工程技术-材料科学：复合

CiteScore

24.40

自引率

11.50%

发文量

784

审稿时长

21 days

期刊介绍： Composites Part B: Engineering is a journal that publishes impactful research of high quality on composite materials. This research is supported by fundamental mechanics and materials science and engineering approaches. The targeted research can cover a wide range of length scales, ranging from nano to micro and meso, and even to the full product and structure level. The journal specifically focuses on engineering applications that involve high performance composites. These applications can range from low volume and high cost to high volume and low cost composite development. The main goal of the journal is to provide a platform for the prompt publication of original and high quality research. The emphasis is on design, development, modeling, validation, and manufacturing of engineering details and concepts. The journal welcomes both basic research papers and proposals for review articles. Authors are encouraged to address challenges across various application areas. These areas include, but are not limited to, aerospace, automotive, and other surface transportation. The journal also covers energy-related applications, with a focus on renewable energy. Other application areas include infrastructure, off-shore and maritime projects, health care technology, and recreational products.