The total surface area of the Pt particles (SPt¼ S(e)Ptþ S(i)Pt), evaluatedwith the individual particle diameter observed by STEM, as reported in our previous publica- tion [5], was 100 m2 g 1: S(e)Pt ¼ 62 m2 g 1 and S(i)Pt ¼ 38 m2 g 1.