3 years ago

High-Affinity-Assisted Nanoscale Alloys as Remarkable Bifunctional Catalyst for Alcohol Oxidation and Oxygen Reduction Reactions

High-Affinity-Assisted Nanoscale Alloys as Remarkable Bifunctional Catalyst for Alcohol Oxidation and Oxygen Reduction Reactions
Muhammad Yousuf, Siraj Sultan, Jitendra N. Tiwari, Ahmad M. Harzandi, Varun Vij, Kwang S. Kim, Wang Geun Lee
A key challenge in developing fuel cells is the fabrication of low-cost electrocatalysts with high activity and long durability for the two half-reactions, i.e., the methanol/ethanol oxidation reaction (MOR/EOR) and the oxygen reduction reaction (ORR). Herein, we report a conductivity-enhanced bifunctional electrocatalyst of nanoscale-coated Pt–Pd alloys on both tin-doped indium (TDI) and reduced graphene oxide (rGO), denoted as Pt–Pd@TDI/rGO. The mass activities of Pt in the Pt–Pd@TDI/rGO hybrid toward MOR, EOR, and ORR are 2590, 1500, and 2690 mA/mg, respectively. The ORR Pt specific activity and mass activity of the electrocatalyst are 17 and 28 times larger, respectively, than commercial Pt/C catalysts. All these remarkable catalytic performances are attributed to the role of TDI in enhancing the catalytic activity by protecting Pt from oxidation as well as rapid mass/charge transfer due to the synergistic effect between surface Pt–Pd alloys and TDI/rGO.

Publisher URL: http://dx.doi.org/10.1021/acsnano.7b01073

DOI: 10.1021/acsnano.7b01073

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