The facilely synthesized Fe–N–C@Ti3C2Tx composite exhibited excellent ORR activity and extraordinary stability in both alkaline and acidic solutions.

Simple and reliable mass production of platinum-based alloy catalysts with excellent activity and stability is an enormous challenge for the wide commercialization of proton-exchange membrane fuel cells (PEMFC), especially those with ultralow loading of Pt. Herein, an economical, highly durable, and efficient catalyst consisting of structurally ordered intermetallic Pt 3 Co alloy nanoparticles with ultralow Pt loading (1.4 wt %) supported on hierarchically porous carbon structure (three-dimensional, 3D Pt 3 Co/C) were synthesized with large-scale production by the NaCl-template-assisted approach. The obtained best sample, 3D Pt 3 Co/C#1, exhibited mass activities of 11.56 and 0.70 A mg Pt −1 for oxygen reduction reactions (ORRs) in alkaline and acidic electrolytes, which are 60.8 and 6.4 times those of commercial Pt/C, respectively. Furthermore, the 3D Pt 3 Co/C#1 exhibited excellent stability both in acidic and alkaline electrolytes, with almost no decay of the half-wave potential after 5000 potential cycles. This work proposes a new high-yielding, simple, and environmentally friendly method to fabricate excellent Ptbased alloy electrocatalysts with ultralow loading of Pt, which opens up new hopes for the development of PEMFC.

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Electrospinning has been regarded as an efficient technique owing to its operation scalable and easy to fabricate various nanofibers. In this review, recent progress on the design of electrospun nanofibers...