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Programmable Electrochemical Thermopower via Cation Storage Mode and Structural Order.

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Summary
This summary is machine-generated.

This study quantifies thermopower origins in anatase TiO2 by controlling structure and charge storage. Different ion insertions reveal how lattice entropy, structural disorder, and interfacial effects influence thermopower for electrochemical thermocells.

Keywords:
amorphismanatase TiO2electrochemical thermopowerthermogalvanic

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Thermopower (α) is crucial for thermoelectric energy conversion.
  • Understanding origins of thermopower in materials like TiO2 is key for designing efficient devices.
  • Controlling material structure and charge storage mechanisms can tune thermopower properties.

Purpose of the Study:

  • To decouple and quantify the origins of thermopower (α) in anatase TiO2.
  • To investigate the influence of structure and charge-storage mechanisms (intercalation vs. electrical double-layer) on thermopower.
  • To establish a platform for designing electrochemical thermocells with tunable thermopower.

Main Methods:

  • Synthesis of anatase TiO2 nanoparticles with controlled sizes (30 nm and 5 nm).
  • Insertion of Li+ and Na+ ions to create distinct electrode structures: bulk crystalline, nanoscale hybrid, and amorphous.
  • Measurement and analysis of thermopower (α) across different electrode compositions and structures.

Main Results:

  • Bulk crystalline Li-inserted TiO2 (30 nm) exhibited thermopower dominated by lattice-intercalation entropy (-1.5 to -1.6 mV K⁻¹).
  • Amorphous Na-inserted TiO2 showed enhanced thermopower (|α|) due to structural disorder and interfacial entropy, reaching -4.8 mV K⁻¹.
  • Nanoscale Li-inserted TiO2 (5 nm) demonstrated a hybrid behavior, combining Faradaic and electrical double-layer (EDL) contributions, with α ranging from +2.19 to -1.6 mV K⁻¹.

Conclusions:

  • Thermopower contributions from Faradaic (intercalation) and EDL mechanisms can be independently controlled within the anatase TiO2 system.
  • Structural disorder and interfacial effects significantly enhance thermopower in amorphous TiO2.
  • This work provides a materials design strategy for developing electrochemical thermocells with tailored thermopower outputs.