Photocatalytic　overall　water　splitting　by　sulfide-based　materials　is　a　great　challenge　because　of　the　poor　resilience　of　such　materials　against　hole　oxidation.　In　a　recent　study,　Domen　and　co-workers　developed　an　innovative　strategy　to　stabilize　sulfide-based　photocatalysts　by　hybridizing　S　3p　with　O　2p　orbitals　to　produce　oxysulfides　in　which　S2-　is　stable.　Further　surface　engineering　of　the　oxysulfides　with　dual　co-catalysts　promoted　charge　separation　and　interface　transfer,　thus　reducing　the　charge　build-up　that　inhibits　photocorrosion.　The　pH　value　of　the　reaction　mixture　is　a　critical　consideration　for　achieving　efficient　stoichiometric　H-2　and　O-2　evolution　by　these　oxysulfide　photocatalysts.