p-Type Transparent Conducting Oxide/n-Type Semiconductor Heterojunctions for Efficient and Stable Solar Water Oxidation

Chen, L. et al. p-Type Transparent Conducting Oxide / n-Type Semiconductor Heterojunctions for Efficient and Stable Solar Water Oxidation. Journal of the American Chemical Society, 2015, DOI: 10.1021/jacs.5b03536 (2015).


Scientific Achievement

Efficient charge conduction from the light absorber to the water oxidation catalyst was realized with a transparent, hole-conducting oxide.

Significance & impact

P-type transparent conducting oxides (p-TCOs) coupled to semiconductor absorbers create efficient and stable water oxidation photoanodes with predicted multi-year operational stability

 

Top:  Schematic showing the efficient transfer of photo-excited holes from the light absorber, through the transparent p-type oxide layer, to the water oxidation catalyst; and a transmission electron microscopy image of the absorber/p-TCO.

Bottom:  Solar driven water oxidation performance of 25 mA·cm−2 at 1.23 V vs. RHE is among the highest reported for a Si-based photoanode; inset shows stable operation for at least 100 hours.

  Reprinted with permission from Loiudice, A. et al. Bandgap Tunability in Sb-Alloyed BiVO4Quaternary Oxides as Visible Light Absorbers for Solar Fuel Applications. Advanced Materials, DOI: 10.1002/adma.201502361 (2015).  Copyright (2015) WILEY.

 

Reprinted with permission from Loiudice, A. et al. Bandgap Tunability in Sb-Alloyed BiVO4Quaternary Oxides as Visible Light Absorbers for Solar Fuel Applications. Advanced Materials, DOI: 10.1002/adma.201502361 (2015).  Copyright (2015) WILEY.

Adapted from Chen, L. et al. p-Type Transparent Conducting Oxide / n-Type Semiconductor Heterojunctions for Efficient and Stable Solar Water Oxidation. Journal of the American Chemical Society, 2015, DOI: 10.1021/jacs.5b03536.  Copyright (2015) American Chemical Society.

Adapted from Chen, L. et al. p-Type Transparent Conducting Oxide / n-Type Semiconductor Heterojunctions for Efficient and Stable Solar Water Oxidation. Journal of the American Chemical Society, 2015, DOI: 10.1021/jacs.5b03536.  Copyright (2015) American Chemical Society.

Research Details

  • NiCo2O4 was used as the p-TCO, with Si and InP as model light absorbers.
  • The solid-solid interface between the p-TCO and photoanode was optimized for effective hole transport to the catalyst.
  • Stability evaluation was performed by in situ Raman spectroscopy monitoring of the NiCo2O4structure and by ultrasensitive detection of corrosion products.

Contact: jwager@lbl.gov

 

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