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Upconversion materials: a new frontier in solar water-splitting.

Yerbolat Magazov1,2, Asset Aliyev1,2, Nursaya Zhumabay1,2

  • 1Renewable Energy Lab, National Laboratory Astana Astana 010000 Kazakhstan guldana.zhigerbaeva@nu.edu.kz nurxat.nuraje@nu.edu.kz.

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This summary is machine-generated.

Upconversion materials enhance solar hydrogen production by converting unused infrared light into higher-energy photons. This review compares lanthanide-based and triplet-triplet annihilation (TTA) systems for efficient solar water-splitting.

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Area of Science:

  • Materials Science
  • Photocatalysis
  • Renewable Energy

Background:

  • Solar water-splitting is crucial for hydrogen generation but limited by photocatalyst spectral response.
  • Most semiconductors utilize only UV/visible light, wasting infrared solar energy.
  • Upconversion materials offer a solution by converting low-energy photons to higher-energy ones.

Purpose of the Study:

  • To provide a technical overview of lanthanide (Ln)-based and triplet-triplet annihilation (TTA) upconversion systems for solar hydrogen generation.
  • To compare the advantages and limitations of Ln-based versus TTA-based upconversion strategies.
  • To outline future research directions for maximizing solar-to-hydrogen efficiency.

Main Methods:

  • Review of lanthanide-doped upconversion phosphors for near-infrared-driven photocatalysis.
  • Examination of triplet-triplet annihilation (TTA) upconversion systems (organic and metal-organic).
  • Comparative analysis of Ln-based and TTA-based systems regarding spectral range, stability, and efficiency.

Main Results:

  • Ln-based upconverters enable NIR-driven photocatalysis but have efficiency limits under 1-sun.
  • TTA systems demonstrate efficient upconversion under solar light, boosting H2 production.
  • TTA systems have shown potential for overall water splitting under visible light.

Conclusions:

  • Upconversion materials are vital for extending photocatalyst spectral response and improving solar hydrogen generation.
  • Both Ln-based and TTA-based systems have unique strengths and weaknesses.
  • Integrating both approaches holds promise for next-generation solar water-splitting technologies.