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Self-assembly of Pt Nanocrystals into Three-Dimensional Superlattices Results in Enhanced Electrocatalytic Performance for Methanol Oxidation

Abstract

Because of the collective effects emerged from the integrated nanostructures, more and more research endeavors have been dedicated to realizing the self-organization of nanostructures into complex integrated architectures with multi-functionalities. Thus, the self-organization of nanostructures into higher-order superstructures is becoming an attractive theme in materials research of nanoscience. Herein, we develop a simple and low-temperature solution approach without the need of any preformed Pt seeds for directly realizing a series of three-dimensional (3D) Pt nanocrystal superlattices (NSLs) composed of well-defined interior Pt nanocrystals assembled into 3D face-centered cubic (fcc) superlattice structures. The effects of experimental parameters including solvents, surfactants and structure-directing agents on assembling behavior, structural configuration, and morphological arrangement of 3D Pt NSLs are systematically studied. Through modulating the experimental parameters, the self-organization of 3D Pt NSLs can be elegantly controlled, and an in-depth mechanism for depicting the pathway for Pt nanocrystals self-organized into various 3D Pt NSLs is proposed. The optimal 3D Pt NSLs used as an efficient electrocatalyst exhibits an excellent catalytic performance with tolerant catalytic ability and long-term stability for the methanol oxidation reaction (MOR) with a mass activity of 403 mA mg-1, which is 2 times higher than that of commercial 20 % Pt/C electrocatalyst (200 mA mg-1). This work provides a pathway to realize robust higher-order 3D Pt NSLs with enhanced electrocatalytic performance for the MOR. The long-term stability and the tolerant catalytic ability of 3D Pt NSLs are anticipated to constitute an ideal system with relevance to applications in the renewable energy field.

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Publication details

The article was received on 17 Aug 2018, accepted on 04 Oct 2018 and first published on 08 Oct 2018


Article type: Paper
DOI: 10.1039/C8CE01382A
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Self-assembly of Pt Nanocrystals into Three-Dimensional Superlattices Results in Enhanced Electrocatalytic Performance for Methanol Oxidation

    G. Xu, J. Liu, B. Liu and J. Zhang, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE01382A

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