S1 Supporting Information                                     ! " #  $ % &’  ( ) &# 1 Nano Electrochemistry Laboratory, Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan 2 Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 106, Taiwan 3 National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan *Corresponding Author: Wei.Nien Su (wsu@mail.ntust.edu.tw) and Bing.Joe Hwang (bjh@mail.ntust.edu.tw) # These authors contributed equally.        Titanium chloride (TiCl 4 , ACROS), Molybdenum(V) chloride (MoCl 5 , Aldrich), Dihydrogen hexachloroplatinate(IV) hexahydrate (H 2 PtCl 6 .6H 2 O, 99.9%, 38 to 40% Pt, ACROS); E.Tek (20 wt% Pt on carbon support); Ethylene glycol (ACROS); H 2 gas (10 vol.% H 2 in Ar); Sulfuric acid (ACROS, 98 %). Deionized water (DI water) was used in all experiments.     !" ## $!%&’  XRD spectroscopy on Ti 1.x Mo x O y ; 10 wt% Pt/d.Ti 0.9 Mo 0.1 O y and 20 wt% Pt/d.Ti 0.9 Mo 0.1 O y nanocatalysts was carried in transmission mode with wavelength λ = 1.33024 Å at the beamline 17A1 of the National Synchrotron Radiation Research Center (NSRRC) in Taiwan.