Interfacial La Diffusion in the CeO2/LaFeO3 Hybrid for Enhanced Oxygen Evolution Activity,ACS Applied Materials & Interfaces

当前位置： X-MOL 学术 › ACS Appl. Mater. Interfaces › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Interfacial La Diffusion in the CeO2/LaFeO3 Hybrid for Enhanced Oxygen Evolution Activity
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-01-07 , DOI: 10.1021/acsami.0c21859
Yawen Dai ₁ , Jie Yu ₁ , Zhenbao Zhang ₁ , Chun Cheng ₁ , Peng Tan ₂ , Zongping Shao ₃ , Meng Ni ₁

Affiliation

The electrochemical oxygen evolution reaction (OER) is of great significance for energy conversion and storage. The hybrid strategy is attracting increasing interest for the development of highly active OER electrocatalysts. Regarding the activity enhancement mechanism, electron coupling between two phases in hybrids has been widely reported, but the interfacial elemental redistribution is rarely investigated. Herein, we developed a CeO₂/LaFeO₃ hybrid electrocatalyst for enhanced OER activity. Interestingly, a selective interfacial La diffusion from LaFeO₃ to CeO₂ was demonstrated by the electron energy loss spectra and elemental mapping. This redistribution of cations triggers the change of the chemical environment of interface elements for charge compensation because of the electroneutrality principle, which results in increased oxygen vacancies and high-valent Fe species that promote the OER electrocatalysis. This mechanism might be extended to other hybrid systems and inspire the design of more efficient electrocatalysts.

中文翻译：

CeO ₂ / LaFeO ₃杂化物中的界面La扩散增强了氧气的释放活性

电化学放氧反应（OER）对于能量转换和存储具有重要意义。混合策略对高活性OER电催化剂的开发越来越感兴趣。关于活性增强机制，已经广泛报道了杂化体中两相之间的电子耦合，但是很少研究界面元素的重新分布。本文中，我们开发了CeO ₂ / LaFeO ₃杂化电催化剂以提高OER活性。有趣的是，从LaFeO ₃到CeO ₂的选择性界面La扩散由电子能量损失谱和元素映射证明。由于电子中性原理，阳离子的这种重新分布触发了用于电荷补偿的界面元素的化学环境的变化，这导致氧空位的增加和促进OER电催化的高价Fe物种。该机制可能会扩展到其他混合系统，并启发设计更有效的电催化剂。

更新日期：2021-01-20

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南