• 文献标题:   Graphene cover-promoted metal-catalyzed reactions
  • 文献类型:   Article
  • 作  者:   YAO YX, FU Q, ZHANG YY, WENG XF, LI H, CHEN MS, JIN L, DONG AY, MU RT, JIANG P, LIU L, BLUHM H, LIU Z, ZHANG SB, BAO XH
  • 作者关键词:   graphene, interface catalysi, confinement effect, co oxidation, platinum
  • 出版物名称:   PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
  • ISSN:   0027-8424
  • 通讯作者地址:   Chinese Acad Sci
  • 被引频次:   104
  • DOI:   10.1073/pnas.1416368111
  • 出版年:   2014

▎ 摘  要

Graphitic overlayers on metals have commonly been considered as inhibitors for surface reactions due to their chemical inertness and physical blockage of surface active sites. In this work, however, we find that surface reactions, for instance, CO adsorption/desorption and CO oxidation, can take place on Pt(111) surface covered by monolayer graphene sheets. Surface science measurements combined with density functional calculations show that the graphene overlayer weakens the strong interaction between CO and Pt and, consequently, facilitates the CO oxidation with lower apparent activation energy. These results suggest that interfaces between graphitic overlayers and metal surfaces act as 2D confined nano-reactors, in which catalytic reactions are promoted. The finding contrasts with the conventional knowledge that graphitic carbon poisons a catalyst surface but opens up an avenue to enhance catalytic performance through coating of metal catalysts with controlled graphitic covers.