Gold nanoparticle-based supramolecular approach for dye-sensitized H2-evolving photocathodes

Noémie Lalaoui, Mohamed Abdellah, Kelly L. Materna, Bo Xu, Haining Tian, Anders Thapper, Jacinto Sa, Leif Hammarström, Sascha Ott

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Solar conversion of water into the storable energy carrier H2 can be achieved through photoelectrochemical water splitting using light adsorbing anodes and cathodes bearing O2 and H2 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 H2. 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 H2 evolution.

Original languageEnglish
Pages (from-to)15716-15724
Number of pages9
JournalDalton Transactions
Volume51
Issue number41
DOIs
Publication statusPublished - Sept 23 2022
Externally publishedYes

ASJC Scopus subject areas

  • Inorganic Chemistry

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