Ce掺杂La_(0.7)Sr_(0.3)Cr_(0.5)Fe_(0.5)O_(3-δ)材料的制备及其电化学性能

Preparation and Electrochemical Performance of Ce-Doped La_(0.7)Sr_(0.3)Cr_(0.5)Fe_(0.5)O_(3-δ) Materials

近年来化石燃料大量消耗导致环境污染日益严重,固体氧化物电解池(SOEC)能够高效、环境友好地将CO_(2)转化为CO等高附加值化学品,因此受到广泛关注。开发高效稳定的SOEC需要采用性能优异的电极材料,La_(0.7)Sr_(0.3)Cr_(0.5)Fe_(0.5)O_(3-δ)(Sto-LSCrF)钙钛矿氧化物因其优异的氧化还原稳定性受到了高度重视。为进一步提高Sto-LSCrF燃料电极材料电解CO_(2)的能力,在Sto-LSCrF的A位掺杂Ce来调控Ce_(0.08)La_(0.62)Sr_(0.3)Cr_(0.5)Fe_(0.5)O_(3-δ)(Ce-LSCrF)中可移动氧空穴含量以便提高其对CO_(2)的吸附/活化能力,进而改善其电化学性能。同时对材料的相结构、氧空穴含量以及其对CO_(2)的吸附/脱附能力进行详细的表征和分析。此外,我们还探究了Ce-LSCrF的电化学性能,发现与Sto-LSCrF相比,Ce-LSCrF燃料电极表现出较高的电解性能,也显示出较好的恒压稳定性,电解性能的增强归因于Ce-LSCrF晶格中较多的可移动氧空位可有效吸附/活化CO_(2),以上试验结果表明Ce-LSCrF是性能优异的CO_(2)电解材料。

In recent years,the massive consumption of fossil fuels has led to increasingly serious environmental pollution.Solid oxide electrolysis cell(SOEC)has attracted more and more attention because it can efficiently and environmentally convert CO_(2)into CO and other high value-added chemicals.Electrode materials with excellent performance are crucial to the development of efficient and stable SOEC.La_(0.7)Sr_(0.3)Cr_(0.5)Fe_(0.5)O_(3-δ)(Sto-LSCrF)perovskite oxide has attracted widespread attention due to its excellent oxidation-reduction stability.In order to further improve the performance of Sto-LSCrF fuel electrode materials for CO_(2)electrolysis,the A-site doping Ce strategy in Sto-LSCrF was adopted to improve the content of mobile oxygen vacancies in Ce-LSCrF,so as to increase its adsorption and activation ability of CO_(2)and then enhance its electrochemistry properties.At the same time,the phase structure,oxygen vacancies content and CO_(2)adsorption and desorption capacity of the materials were characterized and analyzed in detail.In addition,the electrochemical performance of Ce-LSCrF was explored.Compared with Sto-LSCrF,Ce-LSCrF fuel electrode not only exhibits higher electrolysis performance,but also shows better constant voltage discharge stability.The enhancement of electrolytic performance is attributed to more mobile oxygen vacancies in Ce-LSCrF lattice that can effectively absorb and activate CO_(2).These results indicate that Ce-LSCrF is an excellent fuel electrode material for CO_(2)electrolysis in SOEC.