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One-Pot Synthesis of Ternary Alloy Hollow Nanostructures with Controlled Morphologies for Electrocatalysis
ACS Applied Materials & Interfaces ( IF 9.5 ) Pub Date : 2021-09-16 , DOI: 10.1021/acsami.1c13171
Yonghyeon Kim 1 , Young Wook Lee 2 , Seunghoon Lee 1, 3 , Jintaek Gong 4 , Hee-Seung Lee 4 , Sang Woo Han 1
Affiliation  

The rational design and synthesis of multimetallic hollow nanostructures (HNSs) have been attracting great attention due to their structural and compositional advantages for application in electrocatalysis. Herein, the one-pot synthesis of Pd–Pt–Ag ternary alloy HNSs with controllable morphologies through a self-templating approach without any pre-synthesized templates is reported. Simultaneous reduction of multiple metal precursors by ascorbic acid in the presence of cetyltrimethylammonium chloride (CTAC) yielded initially metastable Pd–Ag nanocrystals, which can act as a self-template, and subsequent galvanic replacement and reduction led to the formation of final Pd–Pt–Ag HNSs. The size and hollowness (the ratio of inner cavity diameter to outer diameter) of the HNSs could be tuned through control over the concentration of CTAC. This can be attributed to the manipulated reduction kinetics of multiple metal precursors with the change in the CTAC concentration. The prepared Pd–Pt–Ag HNSs exhibited improved catalytic performance for ethanol electro-oxidation due to their large active surface areas and ternary alloy composition.

中文翻译:

具有可控形貌的三元合金空心纳米结构的一锅法合成用于电催化

多金属中空纳米结构(HNSs)的合理设计和合成因其在电催化应用中的结构和组成优势而备受关注。在此,报道了通过自模板方法一锅合成具有可控形貌的 Pd-Pt-Ag 三元合金 HNSs,无需任何预合成模板。在十六烷基三甲基氯化铵 (CTAC) 存在下,通过抗坏血酸同时还原多种金属前体,产生了最初的亚稳态 Pd-Ag 纳米晶体,它可以作为自模板,随后的电置换和还原导致最终 Pd-Pt 的形成-Ag HNS。可以通过控制 CTAC 的浓度来调节 HNS 的尺寸和中空度(内腔直径与外径的比值)。这可以归因于随着 CTAC 浓度的变化,多种金属前体的还原动力学受到操纵。制备的 Pd-Pt-Ag HNSs 由于其大的活性表面积和三元合金成分而表现出改善的乙醇电氧化催化性能。
更新日期:2021-09-29
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