Designing In₂S₃/FeVO₄/CNT Photoelectrode for Enhanced Visible Light Driven Oxygen Evolution

Area of Science:

• Materials Science
• Electrochemistry
• Renewable Energy

Background:

• Photoelectrochemical (PEC) water-splitting is crucial for sustainable hydrogen production.
• Efficient photoelectrodes are key for advancing the oxygen evolution reaction (OER).
• Ternary composites offer potential for enhanced PEC performance.

Purpose of the Study:

• To synthesize and characterize a novel In₂S₃/FeVO₄/CNT ternary composite for efficient PEC oxygen evolution.
• To investigate the synergistic effects of In₂S₃/FeVO₄ heterostructure and CNTs on PEC performance.
• To evaluate the stability and responsiveness of the composite for water-splitting applications.

Main Methods:

• Synthesis of the In₂S₃/FeVO₄/CNT ternary composite.
• Characterization using electrochemical impedance spectroscopy (EIS) and Bode phase analysis.
• Performance evaluation through photocurrent density measurements and chronoamperometric cycling.

Main Results:

• The In₂S₃/FeVO₄/CNT composite exhibits a type-II heterostructure, improving charge separation and reducing recombination.
• The addition of CNTs enhances electron transport and reduces charge transfer resistance.
• Achieved a current density of 14.70 mAcm⁻² at 1.8 V vs. RHE, with excellent stability and responsiveness.

Conclusions:

• The In₂S₃/FeVO₄/CNT ternary composite demonstrates superior PEC performance for OER.
• The synergistic effect of the heterostructure and CNTs is vital for enhanced efficiency and stability.
• This material shows significant promise for visible-light-driven water-splitting applications.