析氧
材料科学
介电谱
循环伏安法
薄膜
带隙
电催化剂
纳米技术
光电子学
化学
物理化学
电极
电化学
作者
Andricus R. Burton,Rajendra Paudel,Bethany E. Matthews,Michel Sassi,Steven R. Spurgeon,Byron H. Farnum,R. Comès
出处
期刊:Journal of materials chemistry. A, Materials for energy and sustainability
[The Royal Society of Chemistry]
日期:2022-01-01
卷期号:10 (4): 1909-1918
被引量:12
摘要
Transition metal oxides have long been an area of interest for water electrocatalysis through the oxygen evolution and oxygen reduction reactions. Iron oxides, such as LaFeO$_{3}$, are particularly promising due to the favorable energy alignment of the valence and conduction bands comprised of Fe$^{3+}$ cations and the visible light band gap of such materials. In this work, we examine the role of band alignment on the electrocatalytic oxygen evolution reaction (OER) in the intrinsic semiconductor LaFeO$_{3}$ by growing epitaxial films of varying thicknesses on Nb-doped SrTiO$_{3}$. Using cyclic voltammetry and electrochemical impedance spectroscopy, we find that there is a strong thickness dependence on the efficiency of electrocatalysis for OER. These measurements are understood based on interfacial band alignment in the system as confirmed by layer-resolved electron energy loss spectroscopy and electrochemical Mott-Schottky measurements. Our results demonstrate the importance of band engineering for the rational design of thin film electrocatalysts for renewable energy sources.
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