多孔氮掺杂碳纳米纤维负载PtZn纳米粒子作为氧还原反应的高稳定性电催化剂

IF 9.9 2区 材料科学 Q1 Engineering
Lei Zhao , Jinxia Jiang , Shuhao Xiao , Zhao Li , Junjie Wang , Xinxin Wei , Qingquan Kong , Jun Song Chen , Rui Wu
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引用次数: 0

摘要

通过将Pt及其合金纳米颗粒(NP)负载在具有大表面积的多孔碳载体上,可以显著提高Pt基催化剂的氧还原反应(ORR)电催化活性。然而,这种催化剂通常是通过构建多孔碳载体,然后在孔内沉积Pt及其合金NP来获得的,其中,由于NP和碳载体之间相对较弱的相互作用,在苛刻的操作条件下,Pt NP的迁移和团聚是不可避免的。在这里,我们开发了一种简单的静电纺丝策略来原位制备负载在多孔氮掺杂碳纳米纤维上的小型PtZn纳米颗粒。电化学结果表明,所制备的PtZn合金催化剂表现出优异的初始ORR活性,半波电位(E1/2)为0.911​V与可逆氢电极(与RHE)的对比,仅降低11​30000次电位循环后mV,相比之下,更显著的下降为24​Pt/C催化剂的E1/2中的mV(在10000电势循环之后)。这种理想的性能归因于在Zn的蒸发和纳米颗粒与碳载体之间增强的相互作用的帮助下产生的三相反应边界,从而在ORR过程中抑制了NP的迁移和聚集。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
PtZn nanoparticles supported on porous nitrogen-doped carbon nanofibers as highly stable electrocatalysts for oxygen reduction reaction

The oxygen reduction reaction (ORR) electrocatalytic activity of Pt-based catalysts can be significantly improved by supporting Pt and its alloy nanoparticles (NPs) on a porous carbon support with large surface area. However, such catalysts are often obtained by constructing porous carbon support followed by depositing Pt and its alloy NPs inside the pores, in which the migration and agglomeration of Pt NPs are inevitable under harsh operating conditions owing to the relatively weak interaction between NPs and carbon support. Here we develop a facile electrospinning strategy to in-situ prepare small-sized PtZn NPs supported on porous nitrogen-doped carbon nanofibers. Electrochemical results demonstrate that the as-prepared PtZn alloy catalyst exhibits excellent initial ORR activity with a half-wave potential (E1/2) of 0.911 ​V versus reversible hydrogen electrode (vs. RHE) and enhanced durability with only decreasing 11 ​mV after 30,000 potential cycles, compared to a more significant drop of 24 ​mV in E1/2 of Pt/C catalysts (after 10,000 potential cycling). Such a desirable performance is ascribed to the created triple-phase reaction boundary assisted by the evaporation of Zn and strengthened interaction between nanoparticles and the carbon support, inhibiting the migration and aggregation of NPs during the ORR.

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来源期刊
Nano Materials Science
Nano Materials Science Engineering-Mechanics of Materials
CiteScore
20.90
自引率
3.00%
发文量
294
审稿时长
9 weeks
期刊介绍: Nano Materials Science (NMS) is an international and interdisciplinary, open access, scholarly journal. NMS publishes peer-reviewed original articles and reviews on nanoscale material science and nanometer devices, with topics encompassing preparation and processing; high-throughput characterization; material performance evaluation and application of material characteristics such as the microstructure and properties of one-dimensional, two-dimensional, and three-dimensional nanostructured and nanofunctional materials; design, preparation, and processing techniques; and performance evaluation technology and nanometer device applications.
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