He Zhen, Li Huangxu, Liao Lingwen
Key Laboratory of Materials Physics, Anhui Key Laboratory of Nanomaterials and Nanotechnology, CAS Center for Excellence in Nanoscience, Institute of Solid State Physics, Hefei Institutes of Physics Science, Chinese Academy of Sciences, Hefei 230031, China.
Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon 999077, Hong Kong SAR, China.
Nanomaterials (Basel). 2025 Jul 5;15(13):1047. doi: 10.3390/nano15131047.
The rational design of a bimetallic nanostructure with a phase separation and interface is of great importance to enhance electrocatalytic performance. Herein, PdNi heterostructures with controlled elemental distributions were constructed via a seeded growth strategy. Partially coated Ni islands in the Pd-Ni nanowire and strained Pd branches in the Pd-NiPd nanowires are revealed, respectively. Impressively, Pd-NiPd nanowires with abundant branches exhibit a superior mass current density and cycling stability toward an ethanol oxidation reaction (EOR) and ethylene glycol oxidation reaction (EGOR). The highest mass activities of 8.63 A mg and 12.53 A mg for EOR and EGOR, respectively, are realized on the Pd-NiPd nanowires. Theoretical calculations indicate that the Pd (100)-PdNi (111) interface stands out as an active site for enhancing OH adsorption and the decreasing CO bonding interaction. This study not only puts forward a simple method to construct bimetallic nanostructures with desired elemental distributions and interfaces but also demonstrates the significance of interface engineering in regulating the catalytic activity of metallic nanomaterials.
设计具有相分离和界面的双金属纳米结构对于提高电催化性能至关重要。在此，通过种子生长策略构建了具有可控元素分布的PdNi异质结构。分别揭示了Pd-Ni纳米线中部分包覆的Ni岛和Pd-NiPd纳米线中应变的Pd分支。令人印象深刻的是，具有丰富分支的Pd-NiPd纳米线对乙醇氧化反应（EOR）和乙二醇氧化反应（EGOR）表现出优异的质量电流密度和循环稳定性。在Pd-NiPd纳米线上分别实现了EOR和EGOR的最高质量活性，分别为8.63 A mg和12.53 A mg。理论计算表明，Pd(100)-PdNi(111)界面是增强OH吸附和降低CO键相互作用的活性位点。该研究不仅提出了一种构建具有所需元素分布和界面的双金属纳米结构的简单方法，还证明了界面工程在调节金属纳米材料催化活性方面的重要性。
