TiO2@Ni(OH)2　core-shell　microspheres　were　synthesized　by　a　facile　strategy　to　obtain　a　perfect　3D　flower-like　nanostructure　with　well-arranged　Ni(OH)2　nanoflakes　on　the　surfaces　of　TiO2　microspheres;　this　arrangement　led　to　a　six-fold　enhancement　in　photocatalytic　hydrogen　evolution.　The　unique　p-n　type　heterostructure　not　only　promotes　the　separation　and　transfer　of　photogenerated　charge　carriers　significantly,　but　also　offers　more　active　sites　for　photocatalytic　hydrogen　production.　A　photocatalytic　mechanism　is　proposed　based　on　the　results　of　electrochemical　measurements　and　X-ray　photoelectron　spectroscopy.　©　2019　Dalian　Institute　of　Chemical　Physics,　the　Chinese　Academy　of　Sciences