In this work, we investigated Pd 2+ - and Pd 0 -loaded graphene oxide (GO) and reduced graphene oxide (r-GO) as water-soluble, visible-light-responsive photocatalysts for the Suzuki-Miyaura C-C coupling reaction. Nanosheets of r-GO (∼200 nm) were found to be a more desirable substrate than GO nanosheets, since the corresponding catalyst showed higher activities than those of the GO catalysts in both the visible-light-induced and thermal reactions. Furthermore, Pd 2+ -loaded GO and r-GO show higher catalytic activities than those of Pd 0 -loaded GO and r-GO because of the more efficient oxidative addition to Pd 2+ compared with that to Pd 0 . Systematic studies under dark and light conditions demonstrated the synergic contributions of photoexcited electron transfer and the strong photothermal effect of r-GO. Pd 2+ - and Pd 0 -loaded r-GO show four-times higher photocatalytic activities compared to those of Pd 0 -MoS 2 and Pd 0 -WS 2 catalysts for the Suzuki-Miyaura C-C coupling reaction.
ASJC Scopus subject areas
- Materials Science(all)