TiO 2 Nanowire-Supported Sulfide Hybrid Photocatalysts for Durable Solar Hydrogen Production

As the feet of clay, photocorrosion induced by hole accumulation has placed serious limitations on the widespread deployment of sulfide nanostructures for photoelectrochemical (PEC) water splitting. Developing sufficiently stable electrodes to construct durable PEC systems is therefore the key to the realization of solar hydrogen production. Here, an innovative charge-transfer manipulation concept based on the aligned hole transport across the interface has been realized to enhance the photostability of In S electrodes toward PEC solar hydrogen production. The concept was realized by conducting compact deposition of In S nanocrystals on the TiO nanowire array. Under PEC operation, the supporting TiO nanowires functioned as an anisotropic charge-transfer backbone to arouse aligned charge transport across the TiO -In S interface. Because of the aligned hole transport, the TiO nanowire-supported In S hybrid nanostructures (TiO -In S ) exhibited improved hole-transfer dynamics at the TiO -In S interface and enhanced hole injection kinetics at the electrode surface, substantially increasing the long-term photostability toward solar hydrogen production. The PEC durability tests showed that TiO -In S electrodes can achieve nearly 90.9% retention of initial photocurrent upon continuous irradiation for 6 h, whereas the pure In S merely retained 20.8% of initial photocurrent. This double-gain charge-transfer manipulation concept is expected to convey a viable approach to the intelligent design of highly efficient and sufficiently stable sulfide photocatalysts for sustainable solar fuel generation.