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In Situ Sulfidation Engineered Hydroxyl-Enriched SnS/TiO2 Heterointerface for Synergistic Charge-Proton Coupled

Suyi Yang1, Kaini Zhang1, Baoyuan Wang1

  • 1International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, People's Republic of China.

Langmuir : the ACS Journal of Surfaces and Colloids
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This study introduces a new sulfidation method to create hydroxyl-rich SnS/TiO2 nanoarrays for enhanced photoelectrochemical water splitting. The hydroxyl groups improve charge and proton transfer, boosting efficiency.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Surface Chemistry

Background:

  • Heterojunction engineering is key for photoelectrode optimization in photoelectrochemical water splitting.
  • The role of interfacial hydroxyl groups in these systems is not well understood.
  • Developing new strategies to leverage interfacial properties is crucial for improving water splitting efficiency.

Purpose of the Study:

  • To investigate the function of interfacial hydroxyl groups in photoelectrochemical water splitting.
  • To develop an in situ sulfidation strategy for creating hydroxyl-enriched heterojunctions.
  • To elucidate the mechanism of hydroxyl-mediated charge and proton transfer.

Main Methods:

  • In situ sulfidation of SnS/TiO2 nanoarrays.
  • Fourier-transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) for characterization.
  • Density functional theory (DFT) calculations for theoretical studies.
  • Photoelectrochemical measurements to evaluate performance.

Main Results:

  • Sulfidation successfully created hydroxyl-enriched SnS/TiO2 heterointerfaces.
  • Hydroxyl groups acted as electronic bridges, reducing interface resistance and enhancing carrier dynamics.
  • Hydroxyl groups served as proton relays, lowering the oxygen evolution reaction (OER) overpotential by 70 mV.
  • Achieved a photocurrent density of 1.99 mA/cm2 at 1.23 V vs RHE and 46% IPCE at 350 nm.

Conclusions:

  • Hydroxyl-mediated interfacial engineering is a viable strategy for optimizing photoelectrodes.
  • The dual role of hydroxyls in facilitating both charge and proton transfer is critical for efficient water splitting.
  • This work provides new insights into charge-proton coupled transfer mechanisms in heterojunction photoelectrodes.