Ultrathin PtxPb nerve-like nanowires (NNWs) with a diameter of only around 3.6 nm were synthesized by a one-step wet-chemical strategy, and they served as robust catalysts for greatly enhancing methanol electrooxidation both under acidic and alkaline conditions. Due to the high CO-poisoning tolerance, superior electrocatalytic activity and stability endowed by the Pt–Pb alloyed composition and the unique structure, the Pt3.5Pb NNWs showed the highest specific activity of 2.78 mA cm−2 in acidic media and 6.51 mA cm−2 in alkaline media toward the methanol oxidation reaction (MOR), which are 5.24 and 4.12 times higher than those of the commercial Pt/C catalysts, respectively. Meanwhile, the demonstrated synthetic strategy for Pt–Pb nanocrystals may stimulate more inspiration and strategies of the novel metal-based nanocrystals for promising applications in electrocatalysis.
Jiashen Xu,Xinyu Gu,Nannan Zhang,Zhengying Wu,Yukou Du
Precious metal nanomaterials have demonstrated significant advantages in the field of alcohol electro-catalytic oxidation. In this study, the inexpensive main group metals lead (Pb) and platinum (Pt) have been innovatively selected to construct an alloy catalyst. By employing the solvent-thermal method, PtPb nanoparticles with a well-defined crystalline structure were successfully synthesized, exhibiting excellent performance. The electrochemical test data revealed that the catalyst achieved mass activities of 15 550 mA mg−1 in the ethylene glycol oxidation reaction and 5948 mA mg−1 in the ethanol oxidation reaction, surpassing those of commercial Pt/C catalysts. Notably, this alloying strategy, based on main group metals, effectively addresses the performance limitations of the conventional transition metal doping system. Furthermore, it introduces a novel concept for material system construction, facilitating the design of cost-effective alcohol fuel cell catalysts. This approach is particularly valuable from a theoretical perspective, as it investigates the synergistic catalytic mechanism between main group metals and precious metals.
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