Gold nanoparticle-based supramolecular approach for dye-sensitized H 2 -evolving photocathodes.
Noémie LalaouiMohamed AbdellahKelly L MaternaBo XuHaining TianAnders ThapperJacinto SáLeif HammarströmSascha OttPublished in: Dalton transactions (Cambridge, England : 2003) (2022)
Solar conversion of water into the storable energy carrier H 2 can be achieved through photoelectrochemical water splitting using light adsorbing anodes and cathodes bearing O 2 and H 2 evolving catalysts, respectively. Herein a novel photocathode nanohybrid system is reported. This photocathode consists of a dye-sensitized p-type nickel oxide (NiO) with a perylene-based chromophore ( PCA ) and a tetra-adamantane modified cobaloxime reduction catalyst ( Co ) that photo-reduces aqueous protons to H 2 . An original supramolecular approach was employed, using β-cyclodextrin functionalized gold nanoparticles ( β-CD-AuNPs ) to link the alkane chain of the PCA dye to the adamantane moieties of the cobaloxime catalyst ( Co ). This new architecture was investigated by photoelectrochemical measurements and via femtosecond-transient absorption spectroscopy. The results show that irradiation of the complete NiO| PCA|β-CD-AuNPs|Co electrode leads to ultrafast hole injection into NiO (π = 3 ps) from the excited dye, followed by rapid reduction of the catalyst, and finally H 2 evolution.
Keyphrases
- highly efficient
- visible light
- reduced graphene oxide
- gold nanoparticles
- ionic liquid
- quantum dots
- energy transfer
- metal organic framework
- room temperature
- sensitive detection
- electron transfer
- ion batteries
- single molecule
- label free
- loop mediated isothermal amplification
- ultrasound guided
- capillary electrophoresis
- aqueous solution
- atomic force microscopy
- molecularly imprinted