Y-Doped PtFeNi Medium-Entropy Nano-Alloy with Engineered (111) Facets for Enhanced Oxygen Reduction Reaction.
basic_science · Level V
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- Record sourced from PubMed, PMID 41699970.
- Also identified by DOI 10.1002/adma.202522896.
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Abstract
The development of highly efficient and durable Pt-based oxygen reduction reaction (ORR) catalysts is paramount for the widespread adoption of proton exchange membrane fuel cells (PEMFCs). Herein, we present a novel Y-doped PtFeNi medium-entropy alloy catalyst, PtFeNiY<sub>8</sub> (PFNY<sub>8</sub>, 8% Y doping), synthesized via a simple one-pot method, achieving preferential exposure of the highly active (111) crystal facet. Systematic experiments and density functional theory calculations demonstrate that Y doping lowers surface energy to promote the formation of the (111) crystal facet, with an optimal doping level of 8% achieving the most stable electronic structure and the most favorable d-band center. The PFNY<sub>8</sub>/C catalyst demonstrates outstanding ORR performance, with a half-wave potential (E<sub>1/2</sub>) of 0.93 V, mass activity (MA) of 3.00 A mg<sup>-1</sup> <sub>Pt</sub>, and excellent durability (after 80,000 ADT cycles, the E<sub>1/2</sub> decreases by only 11 mV, and the MA retention is 73.4%). Furthermore, in PEMFCs, PFNY<sub>8</sub>/C demonstrates a peak power density of 1.75 W cm<sup>-2</sup> under H<sub>2</sub>/O<sub>2</sub> conditions, outperforming commercial Pt/C. This study offers valuable insights into the role of Y doping in tailoring nanoparticle morphology and facet exposure, presenting a new strategy for designing high-performance Pt-based catalysts for next-generation PEMFCs.