Amorphization Activated Multimetallic Pd Alloys for Boosting Oxygen Reduction Catalysis.
basic_science · Level V
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- Record sourced from PubMed, PMID 38214250.
- Also identified by DOI 10.1021/acs.nanolett.3c04045.
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Abstract
Amorphous nanomaterials have drawn extensive attention owing to their unique features, while amorphization on noble metal nanomaterials still remains formidably challenging. Herein, we demonstrate a universal strategy to synthesize amorphous Pd-based nanomaterials from unary to quinary metals through the introduction of phosphorus (P). The amorphous Pd-based nanoparticles (NPs) exhibit generally promoted oxygen reduction reaction (ORR) activity and durability compared with their crystalline counterparts. Significantly, the quinary P-PdCuNiInSn NPs, benefiting from the amorphous structure and multimetallic component effect, exhibit mass activities as high as 1.04 A mg<sub>Pd</sub><sup>-1</sup> and negligible activity decays of 1.8% among the stability tests, which are much better than values for original Pd NPs (0.134 A mg<sub>Pd</sub><sup>-1</sup> and 28.4%). Experimental and theoretical analyses collectively reveal that the synergy of P-induced amorphization and the expansion of metallic components can considerably lower the free energy changes in the rate-determined step, thereby explaining the positive correlation with the catalytic activity.