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A Highly Efficient Multi-phase Catalyst Dramatically Enhances the Rate of Oxygen Reduction
Joule ( IF 39.8 ) Pub Date : 2018-03-01 , DOI: 10.1016/j.joule.2018.02.008
Yu Chen , YongMan Choi , Seonyoung Yoo , Yong Ding , Ruiqiang Yan , Kai Pei , Chong Qu , Lei Zhang , Ikwhang Chang , Bote Zhao , Yanxiang Zhang , Huijun Chen , Yan Chen , Chenghao Yang , Ben deGlee , Ryan Murphy , Jiang Liu , Meilin Liu

This work demonstrates that a multi-phase catalyst coating (∼30 nm thick), composed of BaCoO3−x (BCO) and PrCoO3−x (PCO) nanoparticles (NPs) and a conformal PrBa0.8Ca0.2Co2O5+δ (PBCC) thin film, has dramatically enhanced the rate of oxygen reduction reaction (ORR). When applied to a state-of-the-art La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) cathode in a solid oxide fuel cell (SOFC), the catalyst coating reduced the cathodic polarization resistance from 2.57 to 0.312 Ω cm2 at 600°C. Oxygen molecules adsorb and dissociate rapidly on the NPs due to enriched surface oxygen vacancies and then quickly transport through the PBCC film, as confirmed by density functional theory-based computations. The synergistic combination of the distinctive properties of the two separate phases dramatically enhances the ORR kinetics, which is attractive not only for intermediate-temperature SOFCs but also for other types of energy conversion and storage systems, including electrolysis cells and membrane reactors for synthesis of clean fuels.



中文翻译:

高效的多相催化剂显着提高了氧气还原率

这项工作证明了由BaCoO 3- x(BCO)和PrCoO 3- x(PCO)纳米颗粒(NPs)和保形PrBa 0.8 Ca 0.2 Co 2 O 5+组成的多相催化剂涂层(约30 nm厚)δ(PBCC)薄膜大大提高了氧还原反应(ORR)的速度。当应用于固态氧化物燃料电池(SOFC)中最先进的La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3(LSCF)阴极时,催化剂涂层将阴极极化电阻从2.57降低至0.312Ωcm 2在600°C下。氧分子由于富集的表面氧空位而在NPs上迅速吸附和解离,然后迅速通过PBCC膜传输,这已被基于密度泛函理论的计算所证实。两个独立相的独特特性的协同组合极大地增强了ORR动力学,这不仅对中温SOFC有吸引力,而且对其他类型的能量转换和存储系统(包括电解池和用于合成清洁燃料的膜反应器)也具有吸引力燃料。

更新日期:2018-03-01
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