Feng Hange, Zhang Chaomin, Luo Menghao, Hu Yuechuan, Dong Zibo, Xue Shaolin, Chu Paul K
College of Information Science and Technology, Donghua University, Shanghai 201620, P.R. China.
College of Science, Donghua University, Shanghai 201620, P.R. China.
ACS Appl Mater Interfaces. 2023 Feb 8;15(5):6788-6796. doi: 10.1021/acsami.2c19598. Epub 2023 Jan 26.
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-InSe) 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-InSe heterojunction is exposed to light, photogenerated electrons at the conduction band (CB) of TiO migrate to the valence band (VB) of InSe due to the built-in electric field. The photogenerated electrons with strong reduction capability on the CB of InSe and the holes with strong oxidation capability on the VB of TiO boost the cathode reaction kinetics (ORR/OER). The excellent outcome reveals tremendous commercial potential of photo-enhanced Zn-air batteries.
直接收集太阳能以加速空气阴极上缓慢的氧还原反应（ORR）和析氧反应（OER）动力学是一种很有前景的方法。在此，我们合成了一种阶梯型（S型）二氧化钛-硒化铟（TiO-InSe）异质结催化剂。光照下ORR的起始电位达到1.28 V，而OER的起始电位降至0.48 V。当S型TiO-InSe异质结暴露于光时，由于内建电场，TiO导带（CB）上的光生电子迁移到InSe的价带（VB）。InSe导带上具有强还原能力的光生电子和TiO价带上具有强氧化能力的空穴促进了阴极反应动力学（ORR/OER）。这一优异成果揭示了光增强锌空气电池巨大的商业潜力。
