Surface microstructures and oxygen evolution properties of cobalt oxide deposited on Ir(111) and Pt(111) single crystal substrates
Surface microstructures and oxygen evolution properties of cobalt oxide deposited on Ir(111) and Pt(111) single crystal substrates
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DOI：
10.1002/elsa.202200007
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发表时间：
2023-12-01
影响因子：
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通讯作者：
Wadayama，Toshimasa
中科院分区：
文献类型：
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作者：
Todoroki，Naoto;Tsurumaki，Hiroto;Wadayama，Toshimasa
在0.1 M KOH条件下，通过重复OER测量，研究了Ir（111）和Pt（111）基质上氧化钴（CoOx）薄膜的析氧反应（OER）活性变化。原子力显微镜和X射线光电子能谱分析表明，制备的CoOx/Ir（111）和CoOx/Pt（111）薄膜表面形貌相似，OER过电位几乎相同，估计在430 mV左右。然而，经过三次OER测量，CoOx/Ir（111）的过电位下降了70 mV，而CoOx/Pt（111）的过电位略有上升。结构分析表明，CoOx/Ir（111）显示出分散在Ir（111）表面的岛状CoOx纳米结构，并伴随着cooh的生成。相反，对于CoOx/Pt(111), Pt（111）底物仍然被CoOx薄膜覆盖。结果表明，CoOx（CoOOH）纳米岛与Ir（111）衬底的界面是降低OER过电位的原因。
We investigated the oxygen evolution reaction (OER) activity changes of cobalt oxide (CoOx) thin films on Ir(111) and Pt(111) substrates by repeated OER measurements in 0.1 M KOH. Atomic force microscopy and X‐ray photoelectron spectroscopy analysis of the as‐prepared CoOx/Ir(111) and CoOx/Pt(111) showed similar surface morphologies of the CoOxthin films and almost the same OER overpotentials, which were estimated to be around 430 mV. However, after three OER measurements, the overpotential of CoOx/Ir(111) decreased by 70 mV, whereas that of CoOx/Pt(111) increased slightly. Structural analysis showed that CoOx/Ir(111) revealed the island‐like nanostructures of CoOxdispersed on Ir(111) surface, accompanied by the generation of CoOOH. In contrast, for CoOx/Pt(111), the Pt(111) substrate remains covered by the CoOxthin film. The results suggest that the interaface at CoOx(CoOOH) nano‐islands and Ir(111) substrate are responsible for reducing the OER overpotential.