Xu Caixia, Zhang Huan, Hao Qin, Duan Huimei
Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022 (P.R. China).
Chempluschem. 2014 Jan;79(1):107-113. doi: 10.1002/cplu.201300311. Epub 2013 Nov 12.
A hierarchical nanoporous (HNP) PtCu alloy was successfully fabricated by two-step dealloying of a well-designed PtCuAl precursor alloy combined with an annealing operation. The as-made PtCu alloy has an interconnected hierarchical network architecture with controllable bimodal ligament/pore distributions obtained by adjusting the annealing temperature and the redealloying time. HNP-PtCu exhibits superior specific and mass activities for the oxygen-reduction reaction (ORR) compared with single-modal nanoporous PtCu and commercial Pt/C catalysts. More importantly, the HNP-PtCu alloy shows much higher structure stability with less loss of the electrochemical surface area of Pt and ORR activity upon long-term potential scans in acid solution. The excellent electrocatalytic performance for ORR makes the HNP-PtCu alloy attractive as efficient cathode electrocatalysts in fuel-cell-related technologies.
通过对精心设计的PtCuAl前驱体合金进行两步脱合金并结合退火操作，成功制备了一种分级纳米多孔（HNP）PtCu合金。所制备的PtCu合金具有相互连接的分级网络结构，通过调节退火温度和再脱合金时间可获得可控的双峰韧带/孔隙分布。与单峰纳米多孔PtCu和商业Pt/C催化剂相比，HNP-PtCu对氧还原反应（ORR）表现出优异的比活性和质量活性。更重要的是，在酸性溶液中进行长期电位扫描时，HNP-PtCu合金显示出更高的结构稳定性，Pt的电化学表面积和ORR活性损失更小。ORR优异的电催化性能使HNP-PtCu合金作为燃料电池相关技术中高效的阴极电催化剂具有吸引力。
