Jiang Nan, Zhu Liye, Liu Peng, Zhang Pengju, Gan Yuqi, Zhao Yan, Jiang Yijian
School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing 100124, China.
Key Laboratory of Trans-Scale Laser Manufacturing Technology, Beijing University of Technology, Ministry of Education, Beijing 100124, China.
Materials (Basel). 2024 Apr 18;17(8):1876. doi: 10.3390/ma17081876.
The preparation of electrocatalysts with high performance for the ethanol oxidation reaction is vital for the large-scale commercialization of direct ethanol fuel cells. Here, we successfully synthesized a high-performance electrocatalyst of a AuPd alloy with a decreased alloying degree via pulsed laser irradiation in liquids. As indicated by the experimental results, the photochemical effect-induced surficial deposition of Pd atoms, combined with the photothermal effect-induced interdiffusion of Au and Pd atoms, resulted in the formation of AuPd alloys with a decreased alloying degree. Structural characterization reveals that L-AuPd exhibits a lower degree of alloying compared to C-AuPd prepared via the conventional co-reduction method. This distinct structure endows L-AuPd with outstanding catalytic activity and stability in EOR, achieving mass and specific activities as high as 16.01 A mg and 20.69 mA cm, 9.1 and 5.2 times than that of the commercial Pd/C respectively. Furthermore, L-AuPd retains 90.1% of its initial mass activity after 300 cycles. This work offers guidance for laser-assisted fabrication of efficient Pd-based catalysts in EOR.
制备用于乙醇氧化反应的高性能电催化剂对于直接乙醇燃料电池的大规模商业化至关重要。在此，我们通过液体中的脉冲激光辐照成功合成了一种合金化程度降低的高性能AuPd合金电催化剂。实验结果表明，光化学效应诱导的Pd原子表面沉积，与光热效应诱导的Au和Pd原子相互扩散相结合，导致形成了合金化程度降低的AuPd合金。结构表征显示，与通过传统共还原方法制备的C-AuPd相比，L-AuPd的合金化程度更低。这种独特的结构赋予L-AuPd在乙醇氧化反应中出色的催化活性和稳定性，质量活性和比活性分别高达16.01 A mg和20.69 mA cm，分别是商业Pd/C的9.1倍和5.2倍。此外，L-AuPd在300次循环后保留了其初始质量活性的90.1%。这项工作为激光辅助制备用于乙醇氧化反应的高效Pd基催化剂提供了指导。
