Photo Energy-Enhanced Oxygen Reduction and Evolution Kinetics in Zn-Air Batteries
Article 2023 en
Authors
HF
Hange Feng
CZ
Chaomin Zhang
ML
Menghao Luo
Abstract
1 min read
Harvesting solar energy directly to boost the sluggish kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) on an air cathode is a promising approach. Herein, we synthesize a step-scheme (S-scheme) titanium dioxide-indium selenide (TiO<sub>2</sub>-In<sub>2</sub>Se<sub>3</sub>) heterojunction catalyst. The onset potential in ORR under light illumination reaches 1.28 V and the onset potential decreases to 0.48 V in OER. When an S-scheme TiO<sub>2</sub>-In<sub>2</sub>Se<sub>3</sub> heterojunction is exposed to light, photogenerated electrons at the conduction band (CB) of TiO<sub>2</sub> migrate to the valence band (VB) of In<sub>2</sub>Se<sub>3</sub> due to the built-in electric field. The photogenerated electrons with strong reduction capability on the CB of In<sub>2</sub>Se<sub>3</sub> and the holes with strong oxidation capability on the VB of TiO<sub>2</sub> boost the cathode reaction kinetics (ORR/OER). The excellent outcome reveals tremendous commercial potential of photo-enhanced Zn-air batteries.
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