Stable quantum dot photoelectrolysis cell for unassisted visible light solar water splitting

Hong Bin Yang, Jianwei Miao, Sung Fu Hung, Fengwei Huo, Hao Ming Chen*, Bin Liu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

133 Scopus citations

Abstract

Sunlight is an ideal source of energy, and converting sunlight into chemical fuels, mimicking what nature does, has attracted significant attention in the past decade. In terms of solar energy conversion into chemical fuels, solar water splitting for hydrogen production is one of the most attractive renewable energy technologies, and this achievement would satisfy our increasing demand for carbon-neutral sustainable energy. Here, we report corrosion-resistant, nanocomposite photoelectrodes for spontaneous overall solar water splitting, consisting of a CdS quantum dot (QD) modified TiO2 photoanode and a CdSe QD modified NiO photocathode, where cadmium chalcogenide QDs are protected by a ZnS passivation layer and gas evolution cocatalysts. The optimized device exhibited a maximum efficiency of 0.17%, comparable to that of natural photosynthesis with excellent photostability under visible light illumination. Our device shows spontaneous overall water splitting in a nonsacrificial environment under visible light illumination (λ > 400 nm) through mimicking natures "Z-scheme" process. The results here also provide a conceptual layout to improve the efficiency of solar-to-fuel conversion, which is solely based on facile, scalable solution-phase techniques.

Original languageEnglish
Pages (from-to)10403-10413
Number of pages11
JournalACS Nano
Volume8
Issue number10
DOIs
StatePublished - 28 Oct 2014

Keywords

  • photoelectrochemical cell
  • quantum dots
  • semiconductor
  • water splitting

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