Assembly of Pt Nanoparticles on Graphitized Carbon Nanofibers as Hierarchically Structured Electrodes,ACS Applied Nano Materials

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Assembly of Pt Nanoparticles on Graphitized Carbon Nanofibers as Hierarchically Structured Electrodes
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-09-01 , DOI: 10.1021/acsanm.0c01945
Nejc Hodnik _{1,

2,

3} , Luigi Romano _{1,

2,

4} , Primož Jovanovič ₃ , Francisco Ruiz-Zepeda ₃ , Marjan Bele ₃ , Filippo Fabbri _{1,

5} , Luana Persano ₁ , Andrea Camposeo ₁ , Dario Pisignano _{1,

6}

Affiliation

Carbon-based nanofibers decorated with metallic nanoparticles (NPs) as hierarchically structured electrodes offer significant opportunities for use in low-temperature fuel cells, electrolyzers, flow and air batteries, and electrochemical sensors. We present a facile and scalable method for preparing nanostructured electrodes composed of Pt NPs on graphitized carbon nanofibers. Electrospinning directly addresses the issues related to large-scale production of Pt-based fuel cell electrocatalysts. Through precursors containing polyacrylonitrile and Pt salt electrospinning along with an annealing protocol, we obtain approximately 180 nm thick graphitized nanofibers decorated with approximately 5 nm Pt NPs. By in situ annealing scanning transmission electron microscopy, we qualitatively resolve and quantitatively analyze the unique dynamics of Pt NP formation and movement. Interestingly, by very efficient thermal-induced segregation of all Pt from the inside to the surface of the nanofibers, we increase overall Pt utilization as electrocatalysis is a surface phenomenon. The obtained nanomaterials are also investigated by spatially resolved Raman spectroscopy, highlighting the higher structural order in nanofibers upon doping with Pt precursors. The rationalization of the observed phenomena of segregation and ordering mechanisms in complex carbon-based nanostructured systems is critically important for the effective utilization of all metal-containing catalysts, such as electrochemical oxygen reduction reactions, among many other applications.

中文翻译：

Pt纳米颗粒在石墨化碳纳米纤维上的组装作为分层结构电极

用金属纳米颗粒（NPs）作为分层结构电极装饰的碳基纳米纤维为在低温燃料电池，电解槽，液流和空气电池以及电化学传感器中使用提供了巨大的机会。我们提出了一种简便且可扩展的方法，用于在石墨化碳纳米纤维上制备由Pt NP组成的纳米结构电极。电纺丝直接解决了与大规模生产基于Pt的燃料电池电催化剂有关的问题。通过包含静电纺丝的聚丙烯腈和Pt盐的前体以及退火方案，我们获得了装饰有约5 nm Pt NP的约180 nm厚的石墨化纳米纤维。通过原位退火扫描透射电子显微镜，我们定性地解析和定量分析了Pt NP形成和运动的独特动力学。有趣的是，由于所有Pt从纳米纤维的内部到表面的非常有效的热诱导偏析，由于电催化是一种表面现象，我们提高了Pt的总体利用率。还通过空间分辨拉曼光谱研究了获得的纳米材料，突出了掺杂Pt前体时纳米纤维的较高结构级。复杂的碳基纳米结构系统中观察到的偏析和有序机制现象的合理化对于有效利用所有含金属的催化剂（例如电化学氧还原反应等）至关重要。

更新日期：2020-10-25

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