Zhang Lili, Wei Meng, Wang Suqing, Li Zhong, Ding Liang-Xin, Wang Haihui
School of Chemistry & Chemical Engineering , South China University of Technology , Guangzhou , Guangdong 510640 , China . Email:
Chem Sci. 2015 May 1;6(5):3211-3216. doi: 10.1039/c5sc00124b. Epub 2015 Mar 18.
Nanostructured Pt-metal alloys have shown impressive catalytic properties for the oxygen reduction reaction (ORR) in acidic medium, but their long-term stability has not been satisfactory. Herein, we look beyond the traditional Pt-metal alloys and have developed a new kind of Pt-nonmetal alloy electrocatalyst for the ORR. Specifically, the novel catalyst is composed of interconnected platinum monophosphide (PtP) alloy nanocrystals (∼3-4 nm) and featured supportless nanotube array morphologies. Due to the unique combination of composition and structure, the obtained PtP alloy nanotube arrays not only exhibited remarkable ORR activity, but also showed almost no degradation of the half-wave potential after accelerated durability tests. The result suggests that alloying Pt with a nonmetallic element (such as P) is indeed an effective approach to address the poor stability of Pt-based catalysts in acidic medium.
纳米结构的铂基金属合金在酸性介质中对氧还原反应（ORR）表现出了令人印象深刻的催化性能，但其长期稳定性并不令人满意。在此，我们突破了传统的铂基金属合金，开发了一种新型的用于ORR的铂-非金属合金电催化剂。具体而言，这种新型催化剂由相互连接的单磷化铂（PtP）合金纳米晶体（约3-4纳米）组成，并具有无支撑的纳米管阵列形态。由于组成和结构的独特结合，所制备的PtP合金纳米管阵列不仅表现出显著的ORR活性，而且在加速耐久性测试后半波电位几乎没有下降。结果表明，将铂与非金属元素（如磷）合金化确实是解决铂基催化剂在酸性介质中稳定性差的有效方法。
