Accurate determination of the charge transfer efficiency of photoanodes for solar water splitting.

@article{Klotz2017AccurateDO,
  title={Accurate determination of the charge transfer efficiency of photoanodes for solar water splitting.},
  author={Dino Klotz and Daniel A. Grave and Avner Rothschild},
  journal={Physical chemistry chemical physics : PCCP},
  year={2017},
  volume={19 31},
  pages={
          20383-20392
        }
}
The oxygen evolution reaction (OER) at the surface of semiconductor photoanodes is critical for photoelectrochemical water splitting. This reaction involves photo-generated holes that oxidize water via charge transfer at the photoanode/electrolyte interface. However, a certain fraction of the holes that reach the surface recombine with electrons from the conduction band, giving rise to the surface recombination loss. The charge transfer efficiency, ηt, defined as the ratio between the flux of… 

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References

SHOWING 1-10 OF 63 REFERENCES

Determination of photoelectrochemical water oxidation intermediates on haematite electrode surfaces using operando infrared spectroscopy.

Results provide direct evidence of high-valent iron-oxo intermediates as the product of the first hole-transfer reaction on the haematite surface and represent an important step in establishing the mechanism of PEC water oxidation on semiconductor electrodes.

Electrochemical and photoelectrochemical investigation of water oxidation with hematite electrodes

Atomic layer deposition (ALD) was utilized to deposit uniform thin films of hematite (α-Fe2O3) on transparent conductive substrates for photocatalytic water oxidation studies. Comparison of the

Dynamics of photogenerated holes in surface modified α-Fe2O3 photoanodes for solar water splitting

This paper addresses the origin of the decrease in the external electrical bias required for water photoelectrolysis with hematite photoanodes, observed following surface treatments of such

The potential versus current state of water splitting with hematite.

The potential of hematite as a photoanode material for photoelectrochemical (PEC) water splitting is described and the current understanding of key loss-mechanisms are introduced and correlated to performance enhancement strategies.

Comparison of heterogenized molecular and heterogeneous oxide catalysts for photoelectrochemical water oxidation

Photoelectrochemical (PEC) reactions, such as water splitting, promise a direct route for solar-to-chemical energy conversion. Successful implementations of these reactions often require the

Substrate-Electrode Interface Engineering by an Electron-Transport Layer in Hematite Photoanode.

The result indicates the expedited electron extraction from photoanode to the substrate can suppress not only the recombination at the back contact interface but also those at the surface, which results in higher water oxidation efficiency.

Probing the photoelectrochemical properties of hematite (α-Fe2O3) electrodes using hydrogen peroxide as a hole scavenger

We study hematite (α-Fe2O3) photoelectrodes for water splitting by examining the fate of photogenerated holes. Using H2O2 as an efficient hole scavenger, we collect all holes that arrive at the

Faradaic efficiency of O2 evolution on metal nanoparticle sensitized hematite photoanodes.

The FE has been determined to be 100%, within the experimental errors, for both sensitized and reference samples, and it is demonstrated that the sensitized samples were stable for at least 16 hours photocurrent testing.

Kinetics of light-driven oxygen evolution at alpha-Fe2O3 electrodes.

The kinetics of light-driven oxygen evolution at polycrystalline alpha-Fe2O3 layers prepared by aerosol-assisted chemical vapour deposition has been studied using intensity modulated photocurrent spectroscopy (IMPS), indicating the presence of a kinetic bottleneck in the overall process.
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