Modulating Hole Transport in Multilayered Photocathodes with Derivatized p-Type Nickel Oxide and Molecular Assemblies for Solar-Driven Water Splitting

Bing Shan, Benjamin D. Sherman, Christina M. Klug, Animesh Nayak, Seth L. Marquard, Qing Liu, R Morris Bullock, Thomas J. Meyer

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24 Citations (Scopus)

Abstract

For solar water splitting, dye-sensitized NiO photocathodes have been a primary target. Despite marginal improvement in performance, limitations remain arising from the intrinsic disadvantages of NiO and insufficient catalysis. We report here a new approach to modifying NiO photocathodes with doped NiO bilayers and an additional layer of macro-mesoporous ITO. The trilayered electrode is functionalized with a surface-attached ruthenium polypyridyl dye and a covalently bridged nickel-based hydrogen evolution catalyst. The NiO film, containing a 2% K+-doped NiO inner layer and a 2% Cu2+-doped NiO outer layer, provides sufficient driving force for hole transport following hole injection by the molecular assembly. Upon light irradiation, the resulting photocathode generates hydrogen from water sustainably with enhanced photocurrents and a Faradaic efficiency of ∼90%. This approach highlights the value of modifying both the internal and surface structure of NiO and provides insights into a new generation of dye-sensitized photocathodes for solar-driven water splitting cells.

Original languageEnglish
Pages (from-to)4374-4379
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume8
Issue number18
DOIs
Publication statusPublished - Sep 21 2017

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ASJC Scopus subject areas

  • Materials Science(all)

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