Immobilization of Prussian Blue Nanoparticles Onto Au‐Modified ZnIn2S4 Photoanode for Efficient Photoelectrochemical Water Splitting

Abstract

AbstractZnIn2S4 has been regarded as a promising photoanode material for photoelectrochemical (PEC) water splitting. However, its severe charge recombination and low carrier transport efficiency limit practical applications in PEC water splitting. A novel ZnIn2S4/Au/PB photoanode was prepared by using the in‐situ photodeposition of Au nanoparticles and electrodeposition of Prussian blue (PB) nanoparticles onto ZnIn2S4 nanosheets. The photocurrent density of the prepared ternary photoanode reached 0.42 mA/cm2 at 1.23 VRHE, which is 6 times higher than pure ZnIn2S4. The introduction of Au nanoparticles remarkably improved the efficiency of carrier transport and separation. Additionally, the application of PB onto ZnIn2S4 resulted in an extended spectrum of light absorption. The incident photon‐to‐current efficiency (IPCE) value recorded was 24.6 % at 350 nm. This improvement can be attributed to the formation of a Z‐type heterojunction.