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[资源] Chem Soc Rev 11.10新鲜在线重磅综述：催化活性点

Atomically-thin two-dimensional sheets for understanding active sites in catalysis
Yongfu Sun, Shan Gao, Fengcai Lei and Yi Xie*
通讯作者系：中国科学院院士中国科技大学谢毅教授（14页 42篇文献）

36a.jpg
Catalysis can speed up chemical reactions and it usually occurs on the low coordinated steps, edges,
terraces, kinks and corner atoms that are often called ‘‘active sites’’. However, the atomic level interplay
between active sites and catalytic activity is still an open question, owing to the large difference
between idealized models and real catalysts. This stimulates us to pursue a suitable material model for
studying the active sites–catalytic activity relationship, in which the atomically-thin two-dimensional
sheets could serve as an ideal model, owing to their relatively simple type of active site and the ultrahigh
fraction of active sites that are comparable to the overall atoms. In this tutorial review, we focus on the
recent progress in disclosing the factors that affect the activity of reactive sites, including characterization
of atomic coordination number, structural defects and disorder in ultrathin two-dimensional sheets by
X-ray absorption fine structure spectroscopy, positron annihilation spectroscopy, electron spin resonance
and high resolution transmission electron microscopy. Also, we overview their applications in CO catalytic
oxidation, photocatalytic water splitting, electrocatalytic oxygen and hydrogen evolution reactions, and
hence highlight the atomic level interplay among coordination number, structural defects/disorder, active
sites and catalytic activity in the two-dimensional sheets with atomic thickness. Finally, we also present the
major challenges and opportunities regarding the role of active sites in catalysis. We believe that this
review provides critical insights for understanding the catalysis and hence helps to develop new catalysts
with high catalytic activity.[ Last edited by liwentao2010 on 2015-2-5 at 08:22 ]

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2014-11-10 22:29:08, 4.56 M