Developing materials, interfaces, and devices with improved stability remains one of the key
challenges in the field of photoelectrochemical water splitting. As a barrier to corrosion,
molybdenum disulfide is a particularly attractive protection layer for photocathodes due to its
inherent stability in acid, the low permeability of its basal planes, and the excellent hydrogen
evolution reaction (HER) activity the MoS2 edge. Here, we demonstrate a stable silicon
photocathode containing a protecting layer consisting of molybdenum disulfide …