ZnIn<sub>2</sub>S<sub>4</sub> Heterojunctions Constructed with In-MOF Precursor for Photocatalytic Hydrogen Evolution without Cocatalysts
Shaohong Zang, Xiaorong Cai, Yixian Zang, Fei Jing, Youwei Lu, Shuting Tang, Feng Lin, Liuye Mo
Abstract
Znln 2 S 4 has great prospects for photocatalytic water splitting to hydrogen by visible light. Herein, a novel Znln 2 S 4 –In-MOF (ZnIn M S 4 ) photocatalyst is elaborately synthesized by in situ method with In-MOF as the template and In 3+ as the source. ZnIn M S 4 overcomes the fast interface charge recombination and a sluggish charge lifetime via the formed heterojunctions. Photoelectrochemical measurements reveal that the charge-transfer kinetics is enhanced since In-MOF is introduced to act as a reliable charge-transport channel. ZnIn M S 4 exhibits outstanding cocatalyst-free H 2 evolution rate of 70 μmol h –1 under irradiation (λ > 420 nm), which is 3.2-fold higher than that of Znln 2 S 4 . In addition, the ZnIn M S 4 photocatalyst shows good stability in the 16 h continuous reaction. This work illustrates the feasibility of the MOF precursor instead of inorganic salts to directly synthesize photocatalysts with high performance.