Recent advances in polyoxometalate-based catalysts for light-driven hydrogen evolution.

The photocatalytic hydrogen evolution reaction has been considered as an efficient route to addressing energy and environmental issues. As an interesting class of multi-electron transfer catalysts, polyoxometalates (POMs) have been widely used for photocatalytic hydrogen evolution due to their tunable geometrical and electronic structures, reversible electron storage capacity, and preeminent redox properties. This Frontier article highlights our recent advances in the construction of efficient POM-based photocatalytic hydrogen evolution systems in terms of three aspects, including polyoxometalate-based catalysts, light-absorbing photosensitizers, and sacrificial reagents.