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Revealing the Impact of Electrolyte Composition for Co-Based Water Oxidation Catalysts by the Study of Reaction Kinetics Parameters
ACS Catalysis ( IF 12.9 ) Pub Date : 2020-03-19 , DOI: 10.1021/acscatal.0c00490
Yan Duan 1, 2, 3 , Nicolas Dubouis 1, 4 , Jiaqiang Huang 1, 4 , Daniel Alves Dalla Corte 1, 4 , Vanessa Pimenta 5 , Zhichuan J. Xu 2, 3 , Alexis Grimaud 1, 4
Affiliation  

Recent studies have revealed the critical role played by the electrolyte composition on the oxygen evolution reaction (OER) kinetics on the surface of highly active catalysts. While numerous works were devoted to understand the effect of the electrolyte composition on the physical properties of the catalysts’ surface, very little is known yet about its exact impact on the OER kinetics parameters. In this work, we reveal that the origin for the electrolyte-dependent OER activity for Co-based catalysts originates from two different effects. Increasing the alkaline electrolyte concentration for La1–xSrxCoO3−δ perovskites with x > 0 and for amorphous CoOOH increases the pre-exponential factor, which can be explained either by an increase of the concentration of active sites or by a change in the entropy of activation. However, changing the alkali cation results in a decrease of the apparent activation enthalpy for Fe-containing amorphous films, traducing a change in intermediates’ binding energies.

中文翻译:

通过研究反应动力学参数揭示电解质组合物对钴基水氧化催化剂的影响

最近的研究表明,电解质组合物在高活性催化剂表面的氧释放反应(OER)动力学中起着关键作用。尽管致力于理解电解质组合物对催化剂表面的物理性质的影响的大量工作,但是关于其对OER动力学参数的确切影响知之甚少。在这项工作中,我们揭示了Co基催化剂的电解质依赖性OER活性的起源是来自两种不同的作用。用x增加La 1– x Sr x CoO 3−δ钙钛矿的碱性电解质浓度> 0且对于无定形CoOOH会增加前指数因子,这可以通过增加活性位点的浓度或通过激活熵的变化来解释。但是,改变碱性阳离子会导致含铁非晶膜的表观活化焓降低,从而导致中间体结合能的变化。
更新日期:2020-03-20
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