Fang Liwei, Wang Shengsen, Lu Yiqing, Deng Chengwei, Sun Liping, Cheng Yuanhui
State Key Laboratory of Organic-Inorganic Composites, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
State Key Laboratory of Space Power-Sources Technology, Shanghai Institute of Space Power Sources, Shanghai, 200245, P. R. China.
Chem Asian J. 2023 Oct 17;18(20):e202300601. doi: 10.1002/asia.202300601. Epub 2023 Sep 13.
Carbon-supported Pt is currently used as catalyst for oxygen reduction reaction (ORR) in fuel cells but is handicapped by carbon corrosion at high potential. Herein, a stable PtNi/SnO interface structure has been designed and achieved by a two-step solvothermal method. The robust and conductive Sb-doped SnO supports provide sufficient surfaces to confine PtNi alloy. Moreover, PtNi/Sb SnO presents a more strongly coupled Pt-SnO interface with lattice overlap of Pt (111) and SnO (110), together with enhanced electron transfer from SnO to Pt. Therefore, PtNi/Sb SnO exhibits a high catalytic activity for ORR with a half-wave potential of 0.860 V versus reversible hydrogen electrode (RHE) and a mass activity of 166.2 mA mg @0.9 V in 0.1 M HClO electrolyte. Importantly, accelerated degradation testing (ADT) further identify the inhibition of support corrosion and agglomeration of Pt-based active nanoparticles in PtNi/Sb SnO . This work highlights the significant importance of modulating metal-support interactions for improving the catalytic activity and durability of electrocatalysts.
碳载铂目前用作燃料电池中氧还原反应（ORR）的催化剂，但在高电位下会受到碳腐蚀的影响。在此，通过两步溶剂热法设计并实现了一种稳定的PtNi/SnO界面结构。坚固且导电的Sb掺杂SnO载体提供了足够的表面来限制PtNi合金。此外，PtNi/Sb SnO呈现出更强耦合的Pt-SnO界面，Pt（111）和SnO（110）晶格重叠，同时增强了从SnO到Pt的电子转移。因此，PtNi/Sb SnO在0.1 M HClO电解质中对ORR表现出高催化活性，相对于可逆氢电极（RHE）的半波电位为0.860 V，在0.9 V时的质量活性为166.2 mA mg 。重要的是，加速降解测试（ADT）进一步证实了PtNi/Sb SnO中载体腐蚀的抑制和铂基活性纳米颗粒的团聚。这项工作突出了调节金属-载体相互作用对提高电催化剂催化活性和耐久性的重要意义。
