Plasmonic　metal　nanoparticles　(NPs)　have　been　used　to　improve　the　solar-to-hydrogen　conversion　efficiency.　Relative　to　Au　and　Ag,　Cu　is　cheaper　and　more　abundant.　In　the　present　work,　Cu　NPs　with　the　controlled　diameter　were　deposited　on　TiO2　nanotube　arrays　(TNTAs)　by　using　a　pulse　electrochemical　deposition　method.　When　the　deposition　was　cycled　3600　times,　the　size　of　Cu　NPs　can　be　tuned　to　approximately　30　nm　with　the　most　uniform　distribution,　resulting　in　the　remarkable　characteristic　peak　of　surface　plasmon　resonance　and　higher　photocurrent　density.　The　hydrogen　production　rates　remained　unchanged　during　irradiation　(AM　1.5,　100　mW/cm(2))　of　2　h,　indicating　a　good　stability　of　the　resultant　Cu/TNTAs　electrode.　The　photoelectrochemical　performances　of　as-prepared　Cu/TNTAs　can　also　be　comparable　to　those　of　Ag/TNTAs　electrode　fabricated　by　the　same　method.　(C)　2019　Hydrogen　Energy　Publications　LLC.　Published　by　Elsevier　Ltd.　All　rights　reserved.