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LaFexCo(1–x)O3 Thin-Film Oxygen Reduction Catalysts Prepared Using Spray Pyrolysis without Conductive Additives
ACS Omega ( IF 3.7 ) Pub Date : 2017-11-08 00:00:00 , DOI: 10.1021/acsomega.7b01428 Dilek Dervishogullari 1 , Christopher A. Sharpe 1 , Lee R. Sharpe 1
ACS Omega ( IF 3.7 ) Pub Date : 2017-11-08 00:00:00 , DOI: 10.1021/acsomega.7b01428 Dilek Dervishogullari 1 , Christopher A. Sharpe 1 , Lee R. Sharpe 1
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LaFexCo(1–x)O3 thin films were prepared on fluorine-doped tin oxide conducting glass substrates by spray pyrolysis without any conductive additives and evaluated for their ability to catalyze the oxygen reduction reaction. Onset potential and current density were found to be comparable to platinum, and the resulting crystallite size was on the order of 20 nm. Coordination of the precursor metal ions by citrate was found not to be advantageous. Results from multiple scan linear sweep voltammetry suggest lattice oxide saturation during reduction of oxygen and lattice oxide depletion upon water oxidation. The color of the best-performing composition changes dramatically between 1.2 and −1.15 V versus saturated calomel electrode, so X-ray photoelectron spectra of the fully oxidized and reduced films were compared, demonstrating that cobalt in the film changes oxidation state. Performance of the films as a function of iron-to-cobalt ratio is consistent with what others have reported in the literature, indicating that spray pyrolysis is an efficient method to prepare and evaluate new catalytic materials.
中文翻译：
LaFe x Co （1– x） O 3薄膜热氧还原催化剂，采用喷雾热解法制备，无导电添加剂
LaFe x Co （1– x） O 3在没有任何导电添加剂的情况下，通过喷雾热解在掺氟的氧化锡导电玻璃基板上制备薄膜，并评估它们催化氧还原反应的能力。发现起始电势和电流密度与铂相当，并且所得的微晶尺寸约为20nm。发现前体金属离子与柠檬酸盐的配位是不利的。多次扫描线性扫描伏安法的结果表明，氧还原过程中晶格氧化物饱和，水氧化后晶格氧化物耗尽。相对于饱和甘汞电极，性能最佳的组合物的颜色在1.2至-1.15 V之间发生显着变化，因此比较了完全氧化和还原的薄膜的X射线光电子能谱，表明膜中的钴改变了氧化态。薄膜性能随铁钴比的变化与其他文献报道的一致，表明喷雾热解是制备和评估新型催化材料的有效方法。
更新日期：2017-11-08
中文翻译：
LaFe x Co （1– x） O 3薄膜热氧还原催化剂，采用喷雾热解法制备，无导电添加剂
LaFe x Co （1– x） O 3在没有任何导电添加剂的情况下，通过喷雾热解在掺氟的氧化锡导电玻璃基板上制备薄膜，并评估它们催化氧还原反应的能力。发现起始电势和电流密度与铂相当，并且所得的微晶尺寸约为20nm。发现前体金属离子与柠檬酸盐的配位是不利的。多次扫描线性扫描伏安法的结果表明，氧还原过程中晶格氧化物饱和，水氧化后晶格氧化物耗尽。相对于饱和甘汞电极，性能最佳的组合物的颜色在1.2至-1.15 V之间发生显着变化，因此比较了完全氧化和还原的薄膜的X射线光电子能谱，表明膜中的钴改变了氧化态。薄膜性能随铁钴比的变化与其他文献报道的一致，表明喷雾热解是制备和评估新型催化材料的有效方法。
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