500 nm induced tunable syngas synthesis from CO2 photoreduction by controlling heterojunction concentration

Abstract

A heterostructured CoAl-layered double hydroxide/MoS₂ nanocomposite photocatalyst (CoAl-LDH/MoS₂) for CO₂ photoreduction was prepared by simple electrostatic interactions. The syngas ratio (H₂ : CO) was precisely tuned from 1.3 : 1 to 15 : 1 by altering only the catalyst concentration in the photocatalytic CO₂ reduction system under visible light (λ > 400 nm). Interestingly, a rather high evolution rate can be obtained from CO₂ photoreduction to CO up to 4575 μmol g⁻¹ h⁻¹ even under irradiation above 500 nm.