Intense　studies　are　being　carried　out　on　single　atom　catalysts　that　exhibit　remarkable　activity　and　selectivity.　To　enhance　their　catalytic　abilities,　one　must　have　a　thorough　understanding　of　the　properties　of　the　single　metal　atom　active　site　and　its　dynamics　in　the　working　state.　Herein,　we　report　single　metal　atom　oxide　(SMAO)　(metal:　W/Cu)　anchored　on　TiO2-rGO　nanomaterials　(SMAO-ED-TiO2-rGO)　by　simple　sonication　process.　It　is　efficient　for　the　electrocatalytic　hydrogen　evolution　reaction　(HER),　oxygen　evolution　reaction　(OER)　and　photocatalytic　degradation　of　pharmaceutical　pollutant.　The　uniform　dispersion　of　the　tungsten/copper　metal　atom　oxide　over　a　TiO2-rGO　materials　is　detected　by　high-angle　annular　dark-field　scanning　transmission　electron　microscopy　(HAADF-STEM).　The　SMAO-ED-TiO2-rGO　nanocatalyst　has　shown　impressive　HER/OER　activity　with　an　overpotential　of　121/295　mV　at　(-)10　mA　cm-2　current　density　and　the　low　Tafel　slope　of　96/60.3　mV　dec-　1　in　1　M　KOH　solution.　Further,　SMAO-ED-TiO2-rGO　nanocatalyst　was　used　for　the　photocatalytic　degradation　of　ciprofloxacin　(CF).　After　60　min　of　UV　light　irradiation,　the　SMAO-ED-TiO2-rGO　nanocatalyst　efficiently　photodegraded　98.5%　of　CF　while　retaining　its　activity　for　five　cycles.　Superoxide　radicals　(O2　center　dot-)　are　found　to　be　the