10.1021/am507451c.s001 Janardhan Balapanuru Janardhan Balapanuru Gordon Chiu Gordon Chiu Chenliang Su Chenliang Su Na Zhou Na Zhou Zhu Hai Zhu Hai Qing-hua Xu Qing-hua Xu Kian Ping Loh Kian Ping Loh Photoactive PDI–Cobalt Complex Immobilized on Reduced Graphene Oxide for Photoelectrochemical Water Splitting American Chemical Society 2015 noncovalent interactions cycle testing 5 h Reduced Graphene Oxide photoelectrochemical hydrogen evolution reaction HER graphene oxide turnover number electrocatalytic activity coordination polymer rGO PDI TON vs CoII Photoelectrochemical Water SplittingWe report perylene dye charge transfer interactions 2015-01-14 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Photoactive_PDI_Cobalt_Complex_Immobilized_on_Reduced_Graphene_Oxide_for_Photoelectrochemical_Water_Splitting/2215984 We report the synthesis of a perylene derivative (perylene tetracarboxylic di­(propyl imidazole), abbreviated as PDI) that is coordinated with Co­(II) ions to form a coordination polymer [PDI–Co­(Cl)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>]<sub><i>n</i></sub> (abbreviated as PDI-Co). The PDI-Co complex combines the photoactivity of the perylene dye with the electrocatalytic activity of the “Co­(II)” center for photoelectrochemical hydrogen evolution reaction (HER). To improve charge transfer interactions, the PDI-Co complex is immobilized on reduced graphene oxide (rGO) via noncovalent interactions to form the rGO–PDI-Co complex. The composite shows good performance in multiple cycle testing and the turnover number (TON vs Co<sup>II</sup>) of this hybrid material for hydrogen evolution reaction (754 after 5 h) is considerably higher than previously reported dye-sensitized cobalt-based catalysts.