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Research Article

Fabrication of 3D hollow acorn-shell-like PtBi intermetallics via a surfactant-free pathway for efficient ethylene glycol electrooxidation

Tingting Wan1,2,§, Xin Huang1,§, Sichen Li1,2,§, Qiuyu Li1,2, Xianlong Yang1,2, Zhenjie Sun1( ), Dong Xiang1, Kun Wang1( ), Peng Li1,2( ), Manzhou Zhu1,2
Department of Chemistry and Center for Atomic Engineering of Advanced Materials, School of Materials Science and Engineering, Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Anhui University, Hefei 230601, China
Key Laboratory of Structure and Functional Regulation of Hybrid Materials, Ministry of Education, Anhui University, Hefei 230601, China

§ Tingting Wan, Xin Huang, and Sichen Li contributed equally to this work.

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Graphical Abstract

The atomically ordered bimetallic PtBi intermetallics with clean surfaces and unique three-dimensional hollow acorn-shell-like structure (3D PtBi HASL) exhibited prominent mass activity (24.67 A·mgPt−1) toward ethylene glycol oxidation reaction under alkaline conditions.

Abstract

The synthesis of atomically ordered Pt-based intermetallic electrocatalysts for the direct alcohol fuel cells generally requires the addition of surfactants or the high-temperature annealing. However, some residual surfactants on the surface of the as-synthesized catalysts would prevent the exposure of catalytic active sites, and the high-temperature annealing process is easy to accelerate the sintering of the metal, which both lead to the decline of electrocatalytic performance. Herein, we construct the atomically ordered bimetallic PtBi intermetallics with clean surfaces and unique three-dimensional hollow acorn-shell-like structure (3D PtBi HASL) by a simple, low-temperature, and surfactant-free one-pot synthetic approach. Benefiting from the special hollow structures, the obtained 3D PtBi HASL intermetallics expose abundant accessible active sites. Moreover, the introduction of oxophilic metal Bi can enhance adsorption of OHads, thereby significantly facilitating removal of poisoned intermediates. Density functional theory (DFT) simulations further indicate that formation of the PtBi intermetallic phase with the downshift of the Pt d-band center endows 3D Pt49.4Bi50.6 HASL intermetallics with significantly attenuated COads and enhanced OHads adsorption, bringing about the boosting electrocatalytic property. The mass activity of the 3D Pt49.4Bi50.6 HASL intermetallics for ethylene glycol oxidation reaction is as high as 24.67 A·mgPt−1, which is 12.98 times higher than that of commercial Pt/C (1.90 A·mgPt−1). This work may inspire the design of Pt-based intermetallics as high-efficiency anode electrocatalysts for fuel cell applications.

Keywords

surfactant-free strategyPtBi intermetallicthree-dimensional hollow structureelectrocatalystethylene glycol oxidation reaction

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Nano Research
Volume 16 Issue 5,
May 2023
Pages 6560-6567
DOI: 10.1007/s12274-022-5336-9
Cite this article:
Wan T, Huang X, Li S, et al. Fabrication of 3D hollow acorn-shell-like PtBi intermetallics via a surfactant-free pathway for efficient ethylene glycol electrooxidation. Nano Research, 2023, 16(5): 6560-6567. https://doi.org/10.1007/s12274-022-5336-9
Topics:
Electrocatalysis

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Received: 19 October 2022
Revised: 13 November 2022
Accepted: 15 November 2022
Published: 05 January 2023
© Tsinghua University Press 2022
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