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Related Concept Videos

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
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Trapped state sensitive kinetics in LaTiO2N solid photocatalyst with and without cocatalyst loading.

Rupashree Balia Singh1, Hiroyuki Matsuzaki, Yohichi Suzuki

  • 1National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.

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|November 15, 2014
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Summary
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Understanding charge carrier trapping in LaTiO2N (LTON) photocatalysts is key. This study reveals energetically distributed trapped states and their impact on photocatalytic activity, crucial for efficient solar energy conversion.

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Area of Science:

  • Materials Science
  • Photocatalysis
  • Spectroscopy

Background:

  • Charge carrier trapping in photocatalysts significantly impacts performance by influencing electron-hole separation and recombination.
  • Defect states in photocatalysts can act as either beneficial trapping sites or detrimental recombination centers.
  • Lanthanum titanate nitride (LaTiO2N or LTON) is a promising visible-light responsive photocatalyst.

Purpose of the Study:

  • To investigate the role of trapped charge carriers in the photocatalytic mechanism of LaTiO2N (LTON).
  • To elucidate the influence of CoOx cocatalyst loading on charge carrier dynamics in LTON.
  • To understand the excitation wavelength dependence of photocatalytic kinetics in LTON.

Main Methods:

  • Femtosecond diffuse reflectance spectroscopy was employed to probe ultrafast charge carrier dynamics.
  • Experiments were conducted on bare LTON and CoOx-loaded LTON (2 wt % CoOx-LTON).
  • Varying excitation wavelengths were used to assess the impact of energy input on carrier generation and trapping.

Main Results:

  • Evidence for energetically distributed trapped states was observed in bare LTON, influencing its kinetics.
  • CoOx cocatalyst affected kinetics primarily under above-bandgap excitation, indicating an influence on surface carriers.
  • Photocatalytic kinetics demonstrated a clear dependence on excitation wavelength, consistent with the observed trapped states.

Conclusions:

  • Energetically distributed trapped states play a critical role in the photocatalytic performance of LTON.
  • The CoOx cocatalyst's effect is linked to surface carrier generation under higher energy excitation.
  • Picosecond charge carrier dynamics provide insights into the mechanism of optimized CoOx/LTON photocatalysts.