Perovskite Oxide Based Electrodes for the Oxygen Reduction and Evolution Reactions: The Underlying Mechanism,ACS Catalysis

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Perovskite Oxide Based Electrodes for the Oxygen Reduction and Evolution Reactions: The Underlying Mechanism
ACS Catalysis ( IF 11.3 ) Pub Date : 2021-02-23 , DOI: 10.1021/acscatal.0c04473
Casey E. Beall ₁ , Emiliana Fabbri ₁ , Thomas J. Schmidt _{1,

2}

Affiliation

One hindrance to the development of fuel cells and electrolyzers are the oxygen electrodes, which suffer from high overpotentials and slow kinetics. Perovskite oxides have been shown to be promising oxygen electrode catalysts because of their low cost, flexibility, and tailorable properties. In order to improve perovskite catalysts for the oxygen reduction (ORR) and oxygen evolution (OER) reactions, a better understanding of their reaction mechanisms is needed. This Perspective aims to inform researchers of the current proposed reaction mechanisms for ORR and OER on perovskites and perovskite/carbon composites in order to guide future catalyst development. Additionally, important experimental practices will be recommended. A recent development for OER is the lattice oxygen evolution reaction, which is a possible addition to the conventional four consecutive proton-coupled electron transfer mechanism. Carbon additives are consistently added to perovskites to enhance conductivity and ORR/OER activity. However, carbon plays an active role in ORR, and there is evidence of a synergistic relationship between perovskite and carbon in perovskite/carbon composites.

中文翻译：

钙钛矿型氧还原和放出反应的电极：潜在的机制。

阻碍燃料电池和电解槽发展的一个因素是氧电极，氧电极具有过高的电势和较慢的动力学。钙钛矿氧化物由于其低成本，柔性和可定制的性能而已被证明是有前途的氧电极催化剂。为了改进钙钛矿催化剂的氧还原（ORR）和氧释放（OER）反应，需要对其反应机理有更好的了解。该观点旨在向研究人员介绍目前提出的针对钙钛矿和钙钛矿/碳复合材料的ORR和OER的反应机理，以指导未来催化剂的开发。此外，将推荐重要的实验方法。OER的最新进展是晶格氧释放反应，这可能是对传统的四个连续质子耦合电子转移机制的补充。始终将碳添加剂添加到钙钛矿中，以增强电导率和ORR / OER活性。但是，碳在ORR中起着积极的作用，并且有证据表明钙钛矿与钙钛矿/碳复合材料中的碳之间存在协同关系。

更新日期：2021-03-05

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