Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, P. R. China.
Nanoscale. 2019 Oct 10;11(39):18015-18020. doi: 10.1039/c9nr06344g.
The controllable synthesis of multi-metal nanocrystals with a tetrahedral shape is significant for constructing high-efficiency electrocatalysts. However, due to the great distinction among the thermodynamic reduction potentials of different metal precursors, it is difficult to achieve tetrahedron-shaped alloy nanocrystals with a uniform {111} crystal surface and low surface energy. Herein, we reported a one-pot hydrothermal synthetic strategy to achieve high-yield PdFe alloy tetrahedrons. The unique structure endowed an impressive surface area-to-volume ratio, well distribution of Pd and Fe sites, and essential electronic effects, due to which they could be employed as formic acid oxidation reaction (FAOR) catalysts. As expected, the PdFe alloy tetrahedrons exhibited 4.8 and 2.4 times higher mass activity (595.8 A g-1) and specific activity (33.4 A m-2) compared to commercial Pd black, respectively; they also showed enhanced electrocatalytic stability and good resistance to CO poisoning. This work demonstrates the potential applications of bimetal Pd-based tetrahedrons as promising anode catalysts in a direct formic acid fuel cell.
具有四面体形状的多金属纳米晶体的可控合成对于构建高效电催化剂具有重要意义。然而，由于不同金属前体的热力学还原电位差异很大，因此很难实现具有均匀{111}晶面和低表面能的四面体形状的合金纳米晶体。在此，我们报道了一种一锅水热合成策略，以实现高产率 PdFe 合金四面体。独特的结构赋予了其令人印象深刻的表面积与体积比、Pd 和 Fe 位的良好分布以及重要的电子效应，这使得它们可用作甲酸氧化反应（FAOR）催化剂。不出所料，与商业 Pd 黑相比，PdFe 合金四面体的质量活性（595.8 A g-1）和比活性（33.4 A m-2）分别高出 4.8 倍和 2.4 倍；它们还表现出增强的电催化稳定性和对 CO 中毒的良好抗性。这项工作证明了双金属 Pd 基四面体作为直接甲酸燃料电池中有前途的阳极催化剂的潜在应用。
