Improving Oxygen Reduction Reaction Performance via Central Ions Enhanced Crystal-Field Splitting of MnO6 Octahedron
Improving Oxygen Reduction Reaction Performance via Central Ions Enhanced Crystal-Field Splitting of MnO6 Octahedron
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通过中心离子增强MnO6八面体的晶体场分裂提高氧还原反应性能
DOI：
10.1021/acscatal.2c02779
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发表时间：
2022-10
期刊：
影响因子：
12.9
通讯作者：
Xiaojing Yang
中科院分区：
文献类型：
--
作者：
Haoran Yu;Guoqing Qin;Jianxiu Wang;Xinning Zhao;Lanlan Li;Xiaofei Yu;Xinghua Zhang;Zunming Lu;Xiaojing Yang
This study reported manganese oxide octahedral molecular sieves (OMS-2) with the substitution of potassium ions in the tunnels by alkaline-earth metal ion doping. The results showed that OMS-2 doped with barium ions, whose ionic radius was closest to potassium ions, had the best oxygen reduction activity. The addition of barium ions largely occupied the original positions of potassium ions, resulting in the change of the exposed crystal planes, which changed the adsorption of oxygen. Further research found that the introduction of alkaline-earth metal ions caused the MnO6octahedron to change to varying degrees, the crystal-field splitting energy increased, and the interaction between the metal cations in the tunnel center and the MnO6octahedron was enhanced. It is undeniable that the enhancement of electrocatalytic performance was related to the improvement of oxygen adsorption capacity and electrical conductivity. This research lays the foundation for the future of other transition metal oxide catalysts.
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