Sn-doped TiO_2 nanoparticles with high surface area of 125.7 m~2·g~(-1) are synthesized via a simple one-step hydrothermai method and explored as the cathode catalyst support for proton exchange membrane fuel cells.The synthesized support materials are studied by X-ray diffraction analysis,energy dispersive X-ray spectroscopy and transmission electron microscopy.It is found that the conductivity has been greatly improved by the addition of 30 mol%Sn and Pt nanoparticles are well dispersed on Ti_(0.7)Sn_(0.3)O_2 support with an average size of 2.44 run.Electrochemical studies show that the Ti_(0.7)Sn_(0.3)O_2 nanoparticles have excellent electrochemical stability under a high potential compared to Vulcan XC-72.The as-synthesized Pt/Ti_(0.7)Sn_(0.3)O_2 exhibits high and stable electrocatalytic activity for the oxygen reduction reaction.The Pt/Ti_(0.7)Sn_(0.3)O_2 catalyst reserves most of its electrochemically active surface area(ECA),and its half wave potential difference is 11 mV,which is lower than that of Pt/XC-72(36 mV) under 10 h potential hold at 1.4 V vs.NHE.In addition,the ECA degradation of Pt/Ti_(0.7)Sn_(0.3)O_2is 1.9 times lower than commercial Pt/XC-72 under 500 potential cycles between 0.6 V and 1.2 V vs.NHE.Therefore,the as synthesized Pt/Ti_(0.7)Sn_(0.3)O_2 can be considered as a promising alternative cathode,catalyst for proton exchange membrane fuel cells. Sn-doped TiO2 nanoparticles with high surface area of ​​125.7 m ~ 2 · g ~ (-1) are synthesized via a simple one-step hydrothermai method and explored as cathode catalyst support for proton exchange membrane fuel cells. Synthesized reference materials studied by X-ray diffraction analysis, energy dispersive X-ray spectroscopy and transmission electron microscopy. It is found that the conductivity has been greatly improved by the addition of 30 mol% Sn and Pt nanoparticles are well dispersed on Ti - (0.7) Sn - ( 0.3) O 2 support with an average size of 2.44 run. Electrochemical studies show that the Ti 0.7 Sn 0.3 O 2 nanoparticles have excellent electrochemical stability under a high potential compared to Vulcan XC-72. As as synthesized Pt / Ti 0.7) Sn_ (0.3) O_2 exhibits high and stable electrocatalytic activity for the oxygen reduction reaction.The Pt / Ti_ (0.7) Sn_ (0.3) O_2 catalyst most of its electrochemically active surface area is 11 mV, which The ECA degradation of Pt / Ti 0.7 (0.7) Sn 0.3 O 2 was 1.9 times lower than commercial Pt / XC-72 under 500 potential cycles between 0.6 V and 1.2 V vs. NHE.Therefore, the as synthesized Pt / Ti 0.7 (0.7) Sn 0.3 O 2 can be considered as a promising alternative cathode, catalyst for proton exchange membrane fuel cells .