Substoichiometric Molybdenum Sulfide Phases with Catalytically Active Basal Planes.
Molybdenum sulfide (MoS2) is widely recognized for its catalytic activities where the edges of the crystals turn over reactions. Generating sulfur defects on the basal plane of MoS2can improve its catalytic activity, but generally, there is a lack of model systems for understanding metal-centered catalysis on the basal planes. Here, we synthesized a new phase of substoichiometric molybdenum sulfide (s-MoSx) on a sulfur-enriched copper substrate. The basal plane of s-MoSxcontains chemically reactive Mo-rich sites that can undergo dynamic dissociative adsorption/desorption processes with molecular hydrogen, thus demonstrating its usefulness for hydrogen-transfer catalysis. In addition, scanning tunneling microscopy was used to monitor surface-directed Ullmann coupling of 2,8-dibromo-dibenzothiophene molecules on s-MoSxnanosheets, where the 4-fold symmetric surface sites on s-MoSxdirect C-C coupling to form cyclic tetramers with high selectivity.
Department of Chemistry, National University of Singapore , Singapore 117543, Singapore.|NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore , Singapore 117456, Singapore.|Center for Advanced 2D Materials and Graphene Research Center, National University of Singapore , Singapore 117546, Singapore.
Yang
Y
Bao
Center for Advanced 2D Materials and Graphene Research Center, National University of Singapore , Singapore 117546, Singapore.|Institute of Materials Research and Engineering, Agency for Science, Technology and Research , Singapore 117602, Singapore.
Ming
M
Yang
Department of Chemistry, National University of Singapore , Singapore 117543, Singapore.|NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore , Singapore 117456, Singapore.
Sherman Jun Rong
SJR
Tan
Department of Chemistry, National University of Singapore , Singapore 117543, Singapore.
Yan Peng
YP
Liu
Department of Chemistry, National University of Singapore , Singapore 117543, Singapore.
Hai
H
Xu
Department of Chemistry, National University of Singapore , Singapore 117543, Singapore.|NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore , Singapore 117456, Singapore.|Center for Advanced 2D Materials and Graphene Research Center, National University of Singapore , Singapore 117546, Singapore.
Wei
W
Liu
Department of Chemistry, National University of Singapore , Singapore 117543, Singapore.
Chang Tai
CT
Nai
Center for Advanced 2D Materials and Graphene Research Center, National University of Singapore , Singapore 117546, Singapore.|Department of Physics, National University of Singapore , Singapore 117551, Singapore.
Yuan Ping
YP
Feng
Department of Chemistry, National University of Singapore , Singapore 117543, Singapore.|Center for Advanced 2D Materials and Graphene Research Center, National University of Singapore , Singapore 117546, Singapore.
Jiong
J
Lu
Department of Chemistry, National University of Singapore , Singapore 117543, Singapore.|Center for Advanced 2D Materials and Graphene Research Center, National University of Singapore , Singapore 117546, Singapore.
Kian Ping
KP
Loh