The fabrication of ordered noble metal alloys on carbon supports can effectively alter the electronic structure of the catalyst interface and the valence states of the elements, presenting a viable alternative to platinum (Pt) for the electrocatalysis of the oxygen reduction reaction (ORR) in metal–air battery cathodes. Herein, we developed a straightforward in situ reduction synthesis method that facilitates the formation of ordered PdZn alloy catalysts on hollow carbon under specific conditions, optimizing ORR efficiency. In an oxygen-saturated 0.1 M KOH solution, the ORR performance of the synthesized Pd 0.02 Zn-NC-900 catalyst exhibits an initial potential of ∼0.996 V and a half-wave potential of ∼0.887 V at 1600 rpm. When integrated into a zinc–air battery, it achieves a remarkable specific power of 213.7 mW cm −2 and a specific capacity of 813.8 mAh g Zn − 1 , outperforming commercial Pt/C. Our research focuses on the efficient synthesis of carbon-supported ordered PdZn alloys to address the needs of electrochemical energy conversion applications.
Hongwei He,Zhoulin Ma,Shuya Zhang,An Cai,Huan Ye,Xiaobin Fan,Wenchao Peng,Yang Li
A palladium–zinc alloy nanoparticles decorated nitrogen-doped porous carbon catalyst (PdZn 30 –NC) was synthesized and utilized for Suzuki coupling reaction. The alloying palladium (Pd) with zinc (Zn) and pore expanding are realized simultaneously. Density functional theory (DFT) calculations and experimental studies reveal that the alloying Pd with Zn can lower the energy barrier in Suzuki coupling reaction. Nitrogen adsorption–desorption measurements uncover that pore expansion caused by the zinc nitrate hexahydrate assisted calcination gives rise to the multiplication of mesopore with a pore diameter of 6 nm, which facilitates mass transfer during the reaction. As a result, the alloying Pd with Zn and pore expanding together endow PdZn 30 –NC with excellent catalytic activity. PdZn 30 –NC demonstrates exceptional catalytic activity and stability in Suzuki coupling reaction. A high biphenyl yield of 97.7 % within 40 min and stable reusability of 93.3 % yield after five reuse cycles can be achieved. This work not only offers a viable method for Suzuki coupling reaction, but also provides insights for designing new catalysts toward Suzuki coupling reaction.
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