分子
催化作用
离解(化学)
材料科学
化学物理
金属
电子
活化能
纳米技术
物理化学
化学
物理
有机化学
量子力学
冶金
作者
Huayu Gu,Jintong Lan,Hongqi Shi,Bo Xie,Zhihui Ai,Lizhi Zhang,Xiao Liu
标识
DOI:10.1002/adfm.202310720
摘要
Abstract Water molecules are actively involved in many catalytic oxidation processes, which require the construction of highly active sites for their activation to accelerate the reaction rate, especially over non‐noble metal catalysts. Herein, K species is embeded into the natural 2*2 channel of α‐MnO 2 by a hydrothermal coupled molten salt method, which would make these K species behave in an electron‐rich state and provide more electrons for the activation of water molecules. Compared with surface K modification (namely, the electron‐deficient K species), channel K confinement can lower the activation energy barrier of H 2 O dissociation on α‐MnO 2 to generate hydroxyl species with more nucleophilic oxygen atoms, contributing to the superior HCHO catalytic oxidation activity with a fourfold enhancement. The internal relationship among the confined channel, K species, and catalytic performance is systematically elucidated at the molecular level. This work offers a new ion confinement method and opens up new avenues to construct electron‐rich metal sites with channel structures for the activation of water molecules.
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