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In situ constructing atomic interface in ruthenium-based amorphous hybrid-structure towards solar hydrogen evolution.

Dong Liu1, Tao Ding2, Lifeng Wang3

  • 1National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230029, P. R. China.

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|March 28, 2023
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Summary

Researchers developed a new method for creating atomic interfaces in solar energy conversion. This strategy yields a hybrid structure of ruthenium and ruthenium oxide, boosting solar hydrogen evolution without sacrificial agents.

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Catalysis

Background:

  • Efficient and stable atomic interfaces are crucial for solar energy conversion but difficult to engineer.
  • Developing new strategies for constructing these interfaces is key to advancing solar fuel production.

Purpose of the Study:

  • To report an in-situ oxygen impregnation strategy for creating atomic interfaces.
  • To investigate the formation and properties of homogeneous ruthenium (Ru) and ruthenium oxide (RuOx) amorphous hybrid-mixtures.
  • To evaluate the performance of these interfaces in solar hydrogen evolution.

Main Methods:

  • In-situ synchrotron X-ray absorption spectroscopy (XAS) and photoelectron spectroscopy (PES) were used to track interface formation at the atomic level.
  • An oxygen impregnation strategy was employed to synthesize the Ru-RuOx hybrid-mixture.
  • Solar hydrogen evolution rates were measured using sacrificial agents.

Main Results:

  • Abundant atomic interfaces of homogeneous Ru and RuOx amorphous hybrid-mixtures were successfully constructed.
  • Ruthenium oxide (RuOx) sites efficiently trapped photoexcited holes (<100 fs), and ruthenium (Ru) sites facilitated electron transfer (~1.73 ps).
  • The hybrid structure achieved a high hydrogen evolution rate of 60.8 μmol·h-1 due to long-lived charge-separated states.

Conclusions:

  • The in-situ oxygen impregnation strategy provides a pathway to build efficient atomic interfaces for solar energy conversion.
  • The homogeneous Ru-RuOx hybrid-structure demonstrates significant potential for sacrificial agent-free solar hydrogen evolution.
  • This integrated design approach offers guidelines for developing advanced artificial photosynthesis systems.