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Carbon-supported ordered Pt-Ti alloy nanoparticles as durable oxygen reduction reaction electrocatalyst for polymer electrolyte membrane fuel cells

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Title: Carbon-supported ordered Pt-Ti alloy nanoparticles as durable oxygen reduction reaction electrocatalyst for polymer electrolyte membrane fuel cells

Author(s): Park H.-Y.; Jeon T.-Y.; Lee K.-S.; Yoo S.J.; Young-Eun Sung; Jang J.H.

Subject: Durability, ; Electrocatalyst, ; Oxygen reduction reaction, ; Platinum-titanium alloy, ; Polymer electrolyte membrane fuel cell

Journal: JOURNAL OF ELECTROCHEMICAL SCIENCE AND TECHNOLOGY, v.7, no.4, pp.269 - 276

Abstract: Carbon-supported ordered Pt-Ti alloy nanoparticles were prepared as a durable and efficient oxygen reduction reaction (ORR) electrocatalyst for polymer electrolyte membrane fuel cells (PEMFCs) via wet chemical reduction of Pt and Ti precursors with heat treatment at 800°C. X-ray diffraction analysis confirmed that the prepared electrocatalysts with Ti precursor molar compositions of 40% (PtTi40) and 25% (PtTi25) had ordered Pt3Ti and Pt8Ti structures, respectively. Comparison of the ORR polarization before and after 1500 electrochemical cycles between 0.6 and 1.1 V showed little change in the ORR polarization curve of the electrocatalysts, demonstrating the high stability of the PtTi40 and PtTi25 alloys. Under the same conditions, commercial carbon-supported Pt nanoparticle electrocatalysts exhibited a negative potential shift (10 mV) in the ORR polarization curve after electrochemical cycling, indicating degradation of the ORR activity. © 2016, Korean Electrochemical Society. All rights reserved