Fast　charge　separation　and　transfer　(CST)　is　essential　for　achieving　efficient　solar　conversion　processes.　This　CST　process　requires　not　only　a　strong　driving　force　but　also　a　sufficient　charge　carrier　concentration,　which　is　not　easily　achievable　with　traditional　methods.　Herein,　we　report　a　rapid　hydrogenation　method　enabled　by　gallium-based　liquid　metals　(GBLMs)　to　modify　the　prototypical　WO3　photoelectrode　to　enhance　the　CST　for　a　PEC　process.　Protons　in　solution　are　controllably　embedded　into　the　WO3　photoanode　accompanied　by　electron　injection　due　to　the　strong　reduction　capability　of　GBLMs.　This　process　dramatically　increases　the　carrier　concentration　of　the　WO3　photoanode,　leading　to　improved　charge　separation　and　transfer.　The　hydrogenated　WO3　photoanode　exhibits　over　a　229%　improvement　in　photocurrent　density　with　long-term　stability.　The　effectiveness　of　GBLMs　treatment　in　accelerating　the　CST　process　is　further　proved　using　other　more　general　semiconductor　photoelectrodes,　including　Nb2O5　and　TiO2.