Controlled Preparation and Anti‐Sulfate Electrocatalysis of Self‐Assembled Multidimensional PtZn Quasi‐Cubic Nanodendrites. Issue 7 (30th January 2022)

• Record Type: Journal Article
• Authors: Xing, Qianli; Yan, Wei; Wei, Chuangyu; Xiao, Zuoxu; Jin, Zhicheng; Liu, Xue; Ren, Jianwei; Chen, Yanli; Li, Xiyou
• Is Part Of: Advanced materials interfaces. Volume 9:Issue 7(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-01-30
• Subjects: acid oxygen reduction reaction -- anti‐sulfate poisoning ability -- electrocatalysts -- nanostructures -- PtZn nanodendrites; Materials science -- Periodicals; 620.11
• DOI: 10.1002/admi.202101944
• Languages: English
• ISSNs: 2196-7350

Abstract

Abstract: The multidimensional PtZn quasi‐cubic nanodendrites (PtZn‐ND) with tremendous amounts of defectively coarse branches, having both highly active high‐index facets and short‐range (100) and (110) terraces resisted to sulfate, are synthesized via facile oil phase route at first time. The growth process is found to start from Pt nano‐cuboid seeds, then PtZn nanoclovers which are formed from epitaxial growth, and then the flower‐like PtZn crystals and finally the novel PtZn‐ND. The formation mechanism of PtZn‐ND, in particular the effects of hexadecyltrimethyammonium bromide (CTAB) and oleic acid (OA) on the morphology, crystal shape and exposure lattice facets, have been comparatively and systematically studied. And it turns out that CTAB mainly controls depositing directions, while OA mainly controls the crystal shape/size. The combination effect results in unique PtZn‐ND structures. The novel PtZn‐ND also displays superior catalytic performance and anti‐sulfate poisoning ability. In particular, the mass activity (MA) and specific activity (SA) are 5.72 and 7.55 times higher than those of commercial Pt/C, and still 2.91 and 5.09 times higher after accelerated durability tests in 0.5 m H2 SO4 for oxygen reduction reaction. Abstract : Multidimensional PtZn quasi‐cubic nanodendrites (PtZn‐ND) are developed with tremendous amounts of coarse branches and high‐index facets via a one‐pot oil phase route, and their growth process and mechanism are systematically investigated. Depending on the unique shapes and covered by a lot of short‐range (100) facets, PtZn‐ND as a Pt‐based electrocatalyst exhibits the most oxygen reduction reaction activity in sulfuric acid systems reported so far.