Plasmon-enhanced unidirectional charge transfer for efficient solar water oxidation

Area of Science:

• Materials Science
• Nanotechnology
• Electrochemistry

Background:

• Photoelectrochemical (PEC) materials require precise nano-engineering for efficient solar energy conversion.
• High-speed charge separation and broad spectral response are crucial for improving PEC catalytic activity.

Purpose of the Study:

• To fabricate and evaluate novel 3D-coaxial plasmonic heteronanostructures for enhanced PEC water splitting.
• To investigate the structure-property relationships governing the improved PEC performance.

Main Methods:

• Fabrication of 3D-coaxial plasmonic heteronanostructures (CC@TiO2@SrTiO3-Au).
• Performance evaluation of the fabricated materials in PEC water splitting.
• In-depth simulations to understand charge transfer and light utilization mechanisms.

Main Results:

• The CC@TiO2@SrTiO3-Au nanostructures exhibited superior solar energy conversion efficiency.
• A high current density of 23.56 mA cm-2 (at 1.23 V vs. RHE) was achieved.
• Enhanced PEC performance was attributed to efficient charge transfer and light management via surface plasmon resonance and light scattering.

Conclusions:

• The developed 3D-coaxial plasmonic heteronanostructures offer a promising strategy for efficient PEC water splitting.
• This work provides new insights into the design of plasmon-enhanced PEC nanocatalysts.
• The findings contribute to the advancement of photoelectric energy conversion technologies.