钴
催化作用
离解(化学)
氧化钴
氧化物
电催化剂
X射线光电子能谱
化学
纳米材料
材料科学
吸收光谱法
红外光谱学
无机化学
光化学
物理化学
纳米技术
化学工程
电化学
电极
有机化学
量子力学
工程类
物理
作者
Matthias Schwarz,Fahim Faisal,Susanne Mohr,Chantal Hohner,Kristin Werner,Tao Xu,Tomáš Škála,Nataliya Tsud,Kevin C. Prince,Vladimı́r Matolín,Yaroslava Lykhach,Jörg Libuda
标识
DOI:10.1021/acs.jpclett.8b01033
摘要
Understanding the correlation between structure and reactivity of oxide surfaces is vital for the rational design of catalytic materials. In this work, we demonstrate the exceptional degree of structure sensitivity of the water dissociation reaction for one of the most important materials in catalysis and electrocatalysis. We studied H2O on two atomically defined cobalt oxide surfaces, CoO(100) and Co3O4(111). Both surfaces are terminated by O2- and Co2+ in different coordination. By infrared reflection absorption spectroscopy and synchrotron radiation photoelectron spectroscopy we show that H2O adsorbs molecularly on CoO(100), while it dissociates and forms very strongly bound OH and partially dissociated (H2O) n(OH) m clusters on Co3O4(111). We rationalize this structure dependence by the coordination number of surface Co2+. Our results show that specific well-ordered cobalt oxide surfaces interact very strongly with H2O whereas others do not. We propose that this structure dependence plays a key role in catalysis with cobalt oxide nanomaterials.
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