Promotion of Oxygen Reduction with Both Amorphous and Crystalline MnOx through the Surface Engineering of La0.8Sr0.2MnO3‐δ Perovskite,ChemElectroChem

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Promotion of Oxygen Reduction with Both Amorphous and Crystalline MnOx through the Surface Engineering of La0.8Sr0.2MnO3‐δ Perovskite
ChemElectroChem ( IF 3.5 ) Pub Date : 2018-02-12 , DOI: 10.1002/celc.201701248
Jing Yu ₁ , Dengjie Chen ₂ , Mattia Saccoccio ₁ , Kwunyu Lam ₁ , Francesco Ciucci _{1,

3}

Affiliation

Surfaces play a key role in catalysis. Surfaces can be modified in a number of ways, for example by depositing nanoparticles or with functional coating layers. Here, the surface of La_0.8Sr_0.2MnO_3‐δ (LSMO) is treated with diluted HNO₃. This process leads to the preferential formation of MnO_x/LSMO on the surface, leading to the exposure of Mn cations at the surface of LSMO. The electrocatalytic activity of the MnO_x/LSMO heterostructure towards the oxygen reduction reaction (ORR) is shown to increase when it is compared to the untreated LSMO. Thanks to the formation of MnO_x at the surface, the resulting MnO_x/LSMO possesses 1) a relatively high specific surface area and a mesoporous structure, 2) a higher coverage of Mn⁴⁺/Mn³⁺ cations at the surface, and 3) a high concentration of highly oxidative oxygen species. This work develops a facile strategy (i. e. HNO₃ treatment) for improving the ORR activity of perovskite oxides in alkaline solution at room temperature.

中文翻译：

La0.8Sr0.2MnO3-δ钙钛矿的表面工程促进非晶态和结晶态MnOx的氧还原

表面在催化中起关键作用。可以以多种方式修饰表面，例如通过沉积纳米颗粒或使用功能性涂层。在此，La中的表面_0.8的Sr _0.2 MnO的_3-δ（LSMO）用稀释的HNO处理₃。该过程导致在表面上优先形成MnO _x / LSMO，导致Mn阳离子在LSMO表面暴露。与未处理的LSMO相比，MnO _x / LSMO异质结构对氧还原反应（ORR）的电催化活性显示出增加的趋势。由于在表面形成了MnO _x，因此生成的MnO _x/ LSMO具有1）相对较高的比表面积和中孔结构，2）表面上Mn ⁴⁺ / Mn ³⁺阳离子的覆盖率更高，以及3）高浓度的高氧化性氧。这项工作开发了一种简便的策略（即HNO ₃处理），用于提高室温下碱性溶液中钙钛矿氧化物的ORR活性。

更新日期：2018-02-12

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