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首页> 外文期刊>RSC Advances >Robust catalytically-activated LSM-BCZY-based composite steam electrodes for proton ceramic electrolysis cells
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Robust catalytically-activated LSM-BCZY-based composite steam electrodes for proton ceramic electrolysis cells

机译：用于质子陶瓷电解池的鲁棒催化活化LSM-BCZY基复合蒸汽电极

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Backbone electrodes based on an electronic conductor and a protonic conductor show advantages for proton ceramic electrolyzer cells (PCECs). This work, aims to shed further light on the nature of the rate determining steps in the anode operation and improve the reaction rate in high steam pressure electrolysis mode by (i) adjusting their catalytic activity through electrode infiltration with catalytic electronic-conducting nanoparticles; and (ii) electrochemical activation of surface species by applying a net current through the electrode. A composite formed by La _(0.8) Sr _(0.2) MnO _(3? δ ) (LSM) and BaCe _(0.2) Zr _(0.7) Y _(0.1) O _(3? δ ) (BCZY27) was deposited on proton-conducting BCZY27 electrolytes and studied in symmetrical cells to investigate the anode microstructure and electrochemical performance. Electrochemical impedance spectroscopy (EIS) measurements were performed in the 800–500 °C range under 3 bar of pressure of wet air (75% of steam). LSM/BCZY27 50/50 vol% showed the best performance with an electrode polarization resistance ( R _(p) ) of 6.04 Ω cm ~(2) at 700 °C and high steam pressure (0.75 bar of air and 2.25 bar of steam) whereas LSM/BCZY27 60/40 vol% presented a R _(p) of 18.9 Ω cm ~(2) . The backbone electrodes were infiltrated using aqueous solutions of metal precursors to boost the electrocatalytic activity towards water splitting and oxygen evolution. The infiltrated cells were fired at 850 °C for 2 h to obtain the desired crystalline nanoparticles (Pr _(6) O _(11) , CeO _(2) , ZrO _(2) and Pr _(6) O _(11) –CeO _(2) ) and electrochemically tested under high steam pressures and bias currents to investigate the influence of catalytic activation on surface exchange kinetics. Among the tested catalysts, the lowest electrode polarization resistances (<0.2 Ω cm ~(2) ) were reached for the Pr _(6) O _(11) , CeO _(2) and Pr _(6) O _(11) –CeO _(2) catalysts at 700 °C by applying current densities ranging from 1.57 to 14.15 mA cm ~(?2) , and the Pr _(6) O _(11) –CeO _(2) -activated LSM/BCZY27 electrode exhibited the best performance. Finally, the effect of p O _(2) and p H _(2) O was investigated aiming to characterize the rate limiting processes in the electrodes.
机译：基于电子导体和质子导体的骨干电极对质子陶瓷电解槽（PCEC）具有优势。这项工作旨在进一步阐明阳极操作中速率确定步骤的性质，并通过以下方式提高高蒸汽压电解模式下的反应速率：（i）通过电极渗透用催化导电纳米粒子调节其催化活性; （ii）通过流过电极的净电流对表面物质进行电化学活化。由La _（0.8）Sr _（0.2）MnO _（3？δ）（LSM）和BaCe _（0.2）Zr _（0.7）Y _（0.1）O _（3？δ）（BCZY27）形成的复合物将其沉积在质子传导BCZY27电解质上，并在对称电池中进行研究，以研究阳极的微观结构和电化学性能。电化学阻抗谱（EIS）测量是在800-500°C的温度下，在3 bar的湿空气压力（75％的蒸汽）下进行的。 LSM / BCZY27 50/50 vol％具有最佳性能，在700°C和高蒸汽压（0.75 bar空气和2.25 bar蒸汽）下的电极极化电阻（R _（p））为6.04Ωcm〜（2）。 ），而LSM / BCZY27 60/40 vol％的R _（p）为18.9Ωcm〜（2）。使用金属前体的水溶液渗透骨架电极，以增强对水分解和氧气逸出的电催化活性。将浸润的细胞在850°C的温度下焙烧2 h，以获得所需的结晶纳米颗粒（Pr _（6）O _（11），CeO _（2），ZrO _（2）和Pr _（6）O _（ 11）–CeO _（2））并在高蒸汽压力和偏置电流下进行了电化学测试，以研究催化活化对表面交换动力学的影响。在测试的催化剂中，Pr _（6）O _（11），CeO _（2）和Pr _（6）O _（11）达到最低的电极极化电阻（<0.2Ωcm〜（2）） ）–通过施加1.57至14.15 mA cm〜（？2）的电流密度和Pr _（6）O _（11）–CeO _（2）活化的LSM在700°C的条件下在700°C下使用Ce_C _（2） / BCZY27电极表现出最佳性能。最后，研究了p O _（2）和p H _（2）O的作用，旨在表征电极中的限速过程。

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