Ammonium　hexachloroplatinate　(NH4)(2)PtCl6,　owing　to　its　low　solubility　in　NH4Cl-containing　aqueous　solutions,　is　an　intermediate　compound　during　the　hydrometallurgical　extraction　of　platinum.　As　a　rare　example　of　a　water-soluble　and　air-stable　platinum(IV)　salt　that　is　not　hygroscopic,　(NH4)(2)PtCl6　may　be　a　convenient　and　economic　platinum　precursor　for　large-scale　catalyst　production.　This　report　investigates　the　feasibility　of　(NH4)(2)PtCl6　as　a　Pt　precursor　for　synthesis　of　the　electrocatalysts　for　polymer　electrolyte　membrane　fuel　cells　(PEMFCs),　i.e.,　where　there　is　Pt　supported　on　high　surface　area　carbon　(Pt/C).　The　Pt/C　electrocatalysts　with　similar　to　20　wt　%　Pt　loading　are　synthesized　through　a　microwave-assisted　polyol　synthesis　approach.　The　reaction　parameters,　namely,　the　reaction　time　and　the　reaction　temperature,　are　optimized.　In　terms　of　the　electrochemical　surface　area,　the　Pt/C　electrocatalyst　synthesized　at　a　reaction　temperature　of　140　degrees　C　and　a　reaction　time　of　150　s　using　a　Pt　concentration　of　5　mM　exhibited　the　optimal　performance.　The　process　may　be　used　to　synthesize　Pt/C　electrocatalysts　having　an　electrochemical　performance　equivalent　to　the　Pt/C　catalyst　available　commercially　or　that　synthesized　using　the　common　precursors　such　as　H2PtCl6.