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Benefiting from suitable band energy and outstanding redox reversibility, metal sulfides have drawn extensive research attention in photocatalysis, especially in energy conversion. This review overviews the progress of metal sulfide semiconductors in the recent five years for photocatalytic energy conversion. First, the modifications on morphologies and structures of metal sulfides are introduced. Then, the applications of metal sulfides in photocatalytic energy conversion are outlined, which include H 2 production, CO 2 reduction, and N 2 fixation. Especially, the correlations between modification and photocatalytic activity are elaborated. Finally, the challenges and perspectives of metal sulfides in energy conversion are provided.

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The composition of a photocatalyst is the fundamental determinant of its photoability. Recently, significant attention has been focused on the ternary oxide epitaxial overlayers. Here, a highly active {001} facet dominant coaxialnanocoupled SrTiO 3 /TiO 2 nanotube array thin film was fabricated by a modified two-step anodization combined with a hydrothermal process. Through photoelectrochemical (PEC) measurements, such a coaxial-nanocoupled SrTiO 3 /TiO 2 {001} surface reconstruction can definitely improve its PEC performance. The enhanced PEC performance and strongest photocurrent response of SrTiO 3 /TiO 2 nanotubes (STNs) with a 2 h hydrothermal treatment were ascribed to the fast electron transfer in coaxial nanoarchitecture.

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