Electrochemical Reduction of Oxygen and Nitric Oxide on Mn-Based Perovskites with Different A-Site Cations

IF 2.3 Q3 ELECTROCHEMISTRY International journal of electrochemistry Pub Date : 2020-03-29 DOI:10.1155/2020/4013697
K. Kammer Hansen
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引用次数: 2

Abstract

Four LnMnO3+δ (Ln = La, Pr, Sm, and Gd) perovskites were synthesized and characterized by powder XRD. It was shown that the perovskite lattice became more and more distorted when lowering the size of the A-site cation. The manganite-based perovskites were evaluated for the ability to electrochemically reduce oxygen and nitric oxide in the temperature range of 200 to 400°C. At the lowest temperature, the electrodes were better at reducing nitric oxide than oxygen. At higher temperatures, the activity for the reduction of oxygen and nitric oxide became similar. The activation energies for the reduction of oxygen and nitric oxide were markedly different for LaMnO3+δ and PrMnO3+δ whereas it was similar for SmMnO3+δ and GdMnO3+δ.
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氧和一氧化氮在不同A位阳离子Mn基钙钛矿上的电化学还原
合成了4种LnMnO3+δ (Ln = La, Pr, Sm, Gd)钙钛矿,并用粉末XRD对其进行了表征。结果表明,随着a位阳离子尺寸的减小,钙钛矿晶格的畸变程度越来越大。在200 ~ 400℃的温度范围内,对锰基钙钛矿电化学还原氧和一氧化氮的能力进行了评价。在最低温度下,电极在还原一氧化氮方面优于氧。在较高的温度下,氧和一氧化氮的还原活性变得相似。LaMnO3+δ和PrMnO3+δ对氧和一氧化氮的还原活化能有显著差异,而SmMnO3+δ和GdMnO3+δ对氧和一氧化氮的还原活化能基本一致。
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审稿时长
7 weeks
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