Poux T, Bonnefont A, Ryabova A, Kéranguéven G, Tsirlina G A, Savinova E R
Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé, UMR 7515 CNRS-University of Strasbourg, 25 rue Becquerel, 67087 Strasbourg Cedex, France.
Phys Chem Chem Phys. 2014 Jul 21;16(27):13595-600. doi: 10.1039/c4cp00341a. Epub 2014 Mar 19.
Hydrogen peroxide has been identified as a stable intermediate of the electrochemical oxygen reduction reaction on various electrodes including metal, metal oxide and carbon materials. In this article we study the hydrogen peroxide oxidation and reduction reactions in alkaline medium using a rotating disc electrode (RDE) method on oxides of the perovskite family (LaCoO3, LaMnO3 and La0.8Sr0.2MnO3) which are considered as promising electrocatalytic materials for the cathode of liquid and solid alkaline fuel cells. The experimental findings, such as the higher activity of Mn-compared to that of Co-perovskites, the shape of RDE curves, and the influence of the H2O2 concentration, are rationalized with the help of a microkinetic model.
过氧化氢已被确定为在包括金属、金属氧化物和碳材料在内的各种电极上电化学氧还原反应的稳定中间体。在本文中，我们使用旋转圆盘电极（RDE）方法，研究了在钙钛矿家族的氧化物（LaCoO3、LaMnO3和La0.8Sr0.2MnO3）上碱性介质中的过氧化氢氧化和还原反应，这些氧化物被认为是用于液体和固体碱性燃料电池阴极的有前景的电催化材料。借助微观动力学模型，对诸如Mn-钙钛矿相比Co-钙钛矿具有更高活性、RDE曲线形状以及H2O2浓度的影响等实验结果进行了合理解释。
