“…To date, considerable efforts have been made to generate hydrogen (H 2 ) fuels from clean and renewable energy resources, and one promising approach is photocatalytic H 2 evolution by water splitting. 1–3 However, the process of converting solar energy into H 2 requires finding highly efficient photocatalysts with suitable band structures for visible-light response and the H 2 evolution reaction. 4 Various semiconductors have been investigated as photocatalysts for H 2 production, 5–7 such as metal oxides, 8 sulfides, 9 and g-C 3 N 4 .…”