Electroless Pt deposition on Mn _3O _4 nanoparticles via the galvanic replacement process: Electrocatalytic nanocomposite with enhanced performance for oxygen reduction reaction

摘要

Figure Persented: A novel electroless Pt deposition method was exploited by employing the galvanic replacement process occurring between the Mn _3O _4 surface and PtCl _4 ~(2-) complexes. The newly discovered process provides a simple protocol to produce the catalytic nanocomposite, in which a high density of ultrafine Pt nanocrystals is stably immobilized in a homogeneously dispersive state on the surface of Mn _3O _4 nanoparticles. When the eletrocatalytic activity was tested for the oxygen reduction reaction, which limits the rate of the overall process in proton-exchange membrane fuel cells, the resulting Pt/Mn _3O _4 nanocomposite showed highly enhanced specific activity and durability, compared with those of the commercial Pt/C catalyst.