Pt3Fe Nanoparticles Triggered High Catalytic Performance for Oxygen Reduction Reaction in Both Alkaline and Acidic Media. Issue 2 (25th January 2022) - Zhang, Shuaihui
Abstract: Pt‐based nanomaterials are now the most reliable catalysts for oxygen reduction reaction (ORR). However, the low atomic utilization efficiency and poor stability severely limit their widespread application. Herein, a facile molten salt approach for synthesizing N‐doped porous carbon embedded with Pt3 Fe intermetallic nanoparticles is presented. The Pt loading of the as‐prepared materials is as low at 5.91 wt. %, while exhibiting a half‐wave potential of 0.85 V and diffusion limiting current density of −5.68 mA cm −2 in alkaline condition, which is superior to commercial Pt/C (0.83 V, −5.48 mA cm −2 ). As cathode for Zn‐air battery, the power density and specific capacity up to 130.0 mW cm −2 and 833 mAh g −1, respectively, are outperforming Pt/C batteries (85.8 mW cm −2, 632 mAh g −1 ). The theoretical calculations identify the origin of activity on Pt3 Fe; the Pt3 Fe (111) plane exhibits more positive activity than (200) plane. Abstract : Pt3 Fe intermetallic nanoparticles anchored in nitrogen‐doped porous carbon is presented. As‐prepared catalysts exhibit superior ORR electrocatalytic activity to that of commercial Pt/C, and the theoretical calculations indicate that the Pt3 Fe (111) plane is the main active species.