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Interfacial engineering of metal-insulator-semiconductor junctions for efficient and stable photoelectrochemical water oxidation

Author

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  • Ibadillah A. Digdaya

    (Materials for Energy Conversion and Storage (MECS), Delft University of Technology)

  • Gede W. P. Adhyaksa

    (Center for Nanophotonics, AMOLF)

  • Bartek J. Trześniewski

    (Materials for Energy Conversion and Storage (MECS), Delft University of Technology)

  • Erik C. Garnett

    (Center for Nanophotonics, AMOLF)

  • Wilson A. Smith

    (Materials for Energy Conversion and Storage (MECS), Delft University of Technology)

Abstract

Solar-assisted water splitting can potentially provide an efficient route for large-scale renewable energy conversion and storage. It is essential for such a system to provide a sufficiently high photocurrent and photovoltage to drive the water oxidation reaction. Here we demonstrate a photoanode that is capable of achieving a high photovoltage by engineering the interfacial energetics of metal–insulator–semiconductor junctions. We evaluate the importance of using two metals to decouple the functionalities for a Schottky contact and a highly efficient catalyst. We also illustrate the improvement of the photovoltage upon incidental oxidation of the metallic surface layer in KOH solution. Additionally, we analyse the role of the thin insulating layer to the pinning and depinning of Fermi level that is responsible to the resulting photovoltage. Finally, we report the advantage of using dual metal overlayers as a simple protection route for highly efficient metal–insulator–semiconductor photoanodes by showing over 200 h of operational stability.

Suggested Citation

  • Ibadillah A. Digdaya & Gede W. P. Adhyaksa & Bartek J. Trześniewski & Erik C. Garnett & Wilson A. Smith, 2017. "Interfacial engineering of metal-insulator-semiconductor junctions for efficient and stable photoelectrochemical water oxidation," Nature Communications, Nature, vol. 8(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms15968
    DOI: 10.1038/ncomms15968
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    Cited by:

    1. Chao Feng & Zhi Liu & Huanxin Ju & Andraž Mavrič & Matjaz Valant & Jie Fu & Beibei Zhang & Yanbo Li, 2024. "Understanding the in-situ transformation of CuxO interlayers to increase the water splitting efficiency in NiO/n-Si photoanodes," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    2. Yutao Dong & Mehrdad Abbasi & Jun Meng & Lazarus German & Corey Carlos & Jun Li & Ziyi Zhang & Dane Morgan & Jinwoo Hwang & Xudong Wang, 2023. "Substantial lifetime enhancement for Si-based photoanodes enabled by amorphous TiO2 coating with improved stoichiometry," Nature Communications, Nature, vol. 14(1), pages 1-11, December.

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