摘要： Photoelectrochemical (PEC) water splitting is a promising way to produce clean and sustainable hydrogen fuel. Solar hydrogen production using p-type metal oxide semiconductor photocathodes has not been studied as extensively as n-type metal oxide semiconductor photoanodes and p-type PV-grade non-oxide semiconductor photocathodes. Copper-based oxide photocathodes show relatively good conductivity but suffer from instability in an aqueous solution under illumination. On the other hands, Fe-based metal oxide photocathodes demonstrate more stable PEC performance, but have problems in charge separation and transport. In this mini-review article, we provide an overview of the recent progress in p-type metal oxide-based photocathodes for PEC water reduction. Although these materials are not fully developed up to their potential performance, the involved challenges have been identified and strategies to overcome the limitations have been proposed. Future research in this field should address these issues and challenges in addition to discovery of new materials.