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

作　　者：Tingting Wan Xin Huang Sichen Li Qiuyu Li Xianlong Yang Zhenjie Sun Dong Xiang Kun Wang Peng Li Manzhou Zhu 

机构地区：[1]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 [2]Key Laboratory of Structure and Functional Regulation of Hybrid Materials,Ministry of Education,Anhui University,Hefei 230601,China

出　　处：《Nano Research》2023年第5期6560-6567,共8页纳米研究（英文版）

基　　金：the Natural Science Foundation of Anhui Province(Nos.2108085MB55 and 2208085MB24);the National Natural Science Foundation of China(Nos.21571001,21706048,and 21701001);the Natural Science Research Project of Anhui Province(Nos.KJ2021A0004 and KJ2020ZD04).

摘　　要：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 assynthesized catalysts would prevent the exposure of catalytic active sites,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,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.

关 键 词：surfactant-free strategy PtBi intermetallic three-dimensional hollow structure electrocatalyst ethylene glycol oxidation reaction 

分 类 号：O64[理学—物理化学]