Probing the Interfacial Interaction in Layered-Carbon-Stabilized Iron Oxide Nanostructures: A Soft X-ray Spectroscopic Study.
Probing the Interfacial Interaction in Layered-Carbon-Stabilized Iron Oxide Nanostructures: A Soft X-ray Spectroscopic Study.
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DOI：
10.1021/am5073996
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发表时间：
2015-04
影响因子：
9.5
通讯作者：
Hui Zhang;Jinyin Liu;Guanqi Zhao;Yongjun Gao;T. Tyliszczak;P. Glans;Jinghua Guo;Ding Ma;
中科院分区：
文献类型：
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作者：
Hui Zhang;Jinyin Liu;Guanqi Zhao;Yongjun Gao;T. Tyliszczak;P. Glans;Jinghua Guo;Ding Ma;
我们已经将不同尺寸的氧化铁纳米颗粒(NPs)稳定在表现出优异催化性能的层状碳材料(Fe-Oxide/C)上。X射线吸收光谱(XAS)、X射线发射光谱(XES)、扫描透射式X射线显微镜(STXM)和X射线磁性圆二色谱(XMCD)分析表明，小颗粒氧化铁纳米颗粒与层状碳纳米颗粒之间存在较强的界面相互作用，而大颗粒氧化铁纳米颗粒的界面相互作用较弱。纳米粒子与层状碳之间的界面相互作用与催化性能的提高有关。此外，Fe L边的XMCD谱表明，大尺寸的氧化铁纳米颗粒主要是具有较强铁磁性的γ-Fe_2O_3，而具有较强界面相互作用的小颗粒氧化铁纳米颗粒主要是具有非磁性的α-Fe_2O_3或无定形Fe_2O_3。实验结果有力地表明了界面相互作用对催化剂性能的影响，实验结果为合理设计高性能催化剂提供了指导。
We have stabilized the iron oxide nanoparticles (NPs) of various sizes on layered carbon materials (Fe-oxide/C) that show excellent catalytic performance. From the characterization of X-ray absorption spectroscopy (XAS), X-ray emission spectroscopy (XES), scanning transmission X-ray microscopy (STXM) and X-ray magnetic circular dichroism spectroscopy (XMCD), a strong interfacial interaction in the Fe-oxide/C hybrids has been observed between the small iron oxide NPs and layered carbon in contrast to the weak interaction in the large iron oxide NPs. The interfacial interaction between the NPs and layered carbon is found to link with the improved catalytic performance. In addition, the Fe L-edge XMCD spectra show that the large iron oxide NPs are mainly γ-Fe2O3 with a strong ferromagnetic property, whereas the small iron oxide NPs with strong interfacial interaction are mainly α-Fe2O3 or amorphous Fe2O3 with a nonmagnetic property. The results strongly suggest that the interfacial interaction plays a key role for the catalytic performance, and the experimental findings may provide guidance toward rational design of high-performance catalysts.