Dependence of interface energetics and kinetics on catalyst loading in a photoelectrochemical system

  • Yumin He
  • Srinivas Vanka
  • Tianyue Gao
  • Da He
  • Jeremy Espano
  • Yanyan Zhao
  • Qi Dong
  • Chaochao Lang
  • Yongjie Wang
  • Thomas W. Hamann
  • Zetian Mi
  • Dunwei WangEmail author
Research Article


Solar hydrogen production by the photoelectrochemical method promises a means to store solar energy. While it is generally understood that the process is highly sensitive to the nature of the interface between the semiconductor and the electrolyte, a detailed understanding of this interface is still missing. For instance, few prior studies have established a clear relationship between the interface energetics and the catalyst loading amount. Here we aim to study this relationship on a prototypical Si-based photoelectrochemical system. Two types of interfaces were examined, one with GaN nanowires as a protection layer and one without. It was found that when GaN was present, higher Pt loading (> 0.1 μg/cm2) led to not only better water reduction (and, hence, hydrogen evolution) kinetics but also more favorable interface energetics for greater photovoltages. In the absence of the protection layer, by stark contrast, increased Pt loading exhibited no measurable influence on the interface energetics, and the main difference was observed only in the hydrogen evolution kinetics. The study sheds new light on the importance of interface engineering for further improvement of photoelectrochemical systems, especially concerning the role of catalysts and protection layers.


photoelectrochemistry water splitting Si hydrogen evolution catalyst nanowires 


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The authors gratefully acknowledge research support from the HydroGEN Advanced Water Splitting Materials Consortium, established as part of the Energy Materials Network under the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Fuel Cell Technologies Office, under Award Number DE-EE0008086 XPS and TEM was performed at the Center for Nanoscale Systems (CNS) in Harvard University.

Supplementary material

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Dependence of interface energetics and kinetics on catalyst loading in a photoelectrochemical system


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Copyright information

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Yumin He
    • 1
  • Srinivas Vanka
    • 2
    • 4
  • Tianyue Gao
    • 1
  • Da He
    • 1
  • Jeremy Espano
    • 1
  • Yanyan Zhao
    • 1
  • Qi Dong
    • 1
  • Chaochao Lang
    • 1
  • Yongjie Wang
    • 2
  • Thomas W. Hamann
    • 3
  • Zetian Mi
    • 2
  • Dunwei Wang
    • 1
    Email author
  1. 1.Department of Chemistry, Merkert Chemistry CenterBoston CollegeChestnut HillUSA
  2. 2.Department of Electrical Engineering and Computer ScienceUniversity of MichiganAnn ArborUSA
  3. 3.Department of ChemistryMichigan State UniversityEast LansingUSA
  4. 4.Department of Electrical and Computer EngineeringMcGill UniversityMontrealCanada

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