结构不对称的Ni-O-Mn节点在碳化物支持CO2光降解的金属有机层上
Chen Guan1, Xiaoyang Yue1, Yulong Liao1
1State Key Laboratory of Electronic Thin Film and Integrated Devices, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 610054, P. R. China.
催化场的Jahn-Teller扭曲会增加二氧化碳的减少. 将 (Mn2+) 引入-氧- (Ni-O-Ni) 节点,改善了二氧化碳的吸附和激活,使二氧化碳的产生增加了8.79倍.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 表面化学 表面化学
背景情况:
- 由Jahn-Teller (J-T) 效应引起的格子扭曲是调整电子结构和催化剂中二氧化碳吸附的关键.
- 精确控制J-T扭曲,以提高二氧化碳吸附/激活和产品脱附,仍然是一个挑战.
研究的目的:
- 通过Mn2+交换引发和控制Ni位点中的J-T格子扭曲.
- 调查这种扭曲对二氧化碳吸附,激活和光催化还原的影响.
- 为了提高二氧化碳减排活动和选择性,使用量身定制的催化中心.
主要方法:
- 将高旋转Mn2+纳入Ni-O-Ni节点以诱导J-T扭曲.
- 扩展的X射线吸收细结构 (EXAFS) 用于结构分析.
- 密度函数理论 (DFT) 模拟用于电子结构和粘合.
- 磁性歇斯底里循环 (M-H) 对磁性质的测量.
- 光催化二氧化碳减排实验.
主要成果:
- 成功诱导J-T网格扭曲在邻Ni-O-Mn节点的Ni位点.
- 在具有缩短 Ni-O 键的 Ni-O 格子中观察到结构收缩.
- 由于Mn2+增强的自旋电子增加了磁化强度.
- 通过电子和孔之间的自旋不匹配来抑制电荷重组.
- 在Ni d轨道和CO2p轨道之间增强轨道杂交,促进CO2吸附/激活.
- 与未经修改的Ni-O-Ni节点相比,CO生产率增加了8.79倍.
结论:
- 网格不匹配的Ni-O-Mn节点有效诱导J-T扭曲,增强CO2吸附和激活.
- 加入Mn2+会改善磁性,并抑制电荷重组.
- 量身定制的J-T扭曲为高效的光催化二氧化碳减排提供了一个有前途的策略,没有共催化剂或牺牲试剂.
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