Photoelectrochemical　(PEC)　splitting　of　water　over　a　semiconductor　is　an　ideal　and　clean　way　to　produce　hydrogen　by　using　solar　energy.　Herein,　a　photoanode　of　TiO2　nanotube　arrays　(TNTA)　was　decorated　with　environment-friendly　Cu-based　nanomaterials　through　a　two-step　electrochemical　process,　followed　by　sensitization　with　eosin　Y　dye,　for　PEC　water　splitting.　The　confirmations　of　Cu　and　CuO　on　the　surface　of　TNTA　were　recorded　by　XRD　combined　with　XPS　techniques.　The　obtained　Cu-CuO/TNTA　and　Eosin　Y/Cu-CuO/TNTA　electrodes　exhibit　good　light　absorption　abilities　in　the　range　of　380-600　nm,　and　the　adsorption　of　Eosin　Y　is　enhanced.　Based　on　the　analysis　of　the　charge　transfer　resistance　and　energy　levels　of　Cu,　CuO,　TiO2,　and　eosin　Y,　it　can　be　found　that　the　deposition　of　Cu-CuO　and　eosin　Y　on　TNTA　can　greatly　accelerate　the　interface　charge　transfer,　resulting　in　enhanced　PEC　performances.　Moreover,　the　plasmonic　Cu　and　eosin　Y　can　help　to　harvest　more　visible　light　and　further　improve　the　photocurrent　density.