Novel networked wicker-like PtFe nanowires with branch-rich exteriors for efficient electrocatalysis. Issue 33 (8th August 2019)

• Record Type: Journal Article
• Authors: Zhang, Yangping; Gao, Fei; Song, Tongxin; Wang, Cheng; Chen, Chunyan; Du, Yukou
• Is Part Of: Nanoscale. Volume 11:Issue 33(2019)
• Page Start: 15561
• Page End: 15566
• Publication Date: 2019-08-08
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c9nr05325e
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : We efficiently constructed a kind of novel networked wicker-like interconnected PtFe NWs catalyst with branch-rich exteriors. The composition-optimized Pt3 Fe NWs show much enhanced catalytic performance towards the EOR and MOR. Abstract : The construction of Pt-based networked nanowire nanocatalysts with high performance is significant in the application of direct alcohol fuel cells. However, it is still a challenge to precisely regulate the surface structure and further improve their catalytic behavior. For this purpose, we have synthesized a series of novel networked wicker-like PtFe nanowire catalysts, different from previous networked nanowire catalysts with smooth surfaces, and the PtFe catalysts possess branch-rich exteriors on the rough surface of each nanowire similar to wickers and they interconnect with each other, which lead to rich steps and defects. Importantly, after electrochemical tests, the composition-optimized Pt3 Fe nanowires were found to exhibit superior catalytic performance towards the ethanol oxidation reaction (EOR) and methanol oxidation reaction (MOR) compared to that of commercial Pt/C catalysts in acid media. In particular, the specific activities of Pt3 Fe nanowires are 7.3 and 7.1 times higher than those of the Pt/C catalysts for EOR and MOR, respectively. In addition, the Pt3 Fe nanowires also show the best durability among these catalysts after 1000 successive cycles, and their residual activities are far better than those of the Pt/C catalysts. The synthesis of wicker-like networked PtFe nanowires offers a new guideline to tune the structure and composition of nanocatalysts for their use in direct alcohol fuel cells and beyond.