PtPd catalysts dispersed on coal-based nitrogen-doped carbon nanotubes for formic acid electro-oxidation

IF 2.4 4区化学 Q3 CHEMISTRY, PHYSICAL

Ionics Pub Date : 2024-07-10 DOI:10.1007/s11581-024-05694-z

Bohua Wu, Yifan Liu, Changqing Wu, Haiting Wang, Xiaoqin Wang, Shanxin Xiong

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Abstract

Using coal-based polyaniline as a carbon source and nitrogen source, nitrogen-doped carbon nanotubes (NCNTs) were successfully prepared through a two-stage furnace process. The PtPd/NCNTs catalysts were synthesized by the ethylene glycol reduction method. The results of transmission electron microscopy (TEM) show that the PtPd nanoparticles with an averaged diameter of 3.1 ± 0.5 nm uniformly support the surface of NCNTs. The X-ray photoelectron spectroscopy (XPS) reveals that nitrogen mainly exists in graphite states in NCNTs. The electrocatalytic activity of the PtPd/NCNTs catalyst was tested by CO stripping voltammetry, cyclic voltammetry (CV), and chronoamperometry (CA). The electrochemical characterization shows that the PtPd/NCNTs catalyst exhibited higher electrocatalytic activity and stability towards formic acid oxidation. At the same time, its forward peak current density (549.83 mA mg⁻¹) is 4.5 times higher than that of PtPd/CNTs (120.90 mA mg⁻¹). The developed NCNTs are highly promising catalyst supports for direct formic acid fuel cells.

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分散在煤基掺氮纳米碳管上的 PtPd 催化剂用于甲酸电氧化

以煤基聚苯胺为碳源和氮源，通过两段炉工艺成功制备了掺氮碳纳米管（NCNTs）。乙二醇还原法合成了铂钯/NCNTs 催化剂。透射电子显微镜（TEM）结果表明，平均直径为 3.1 ± 0.5 nm 的 PtPd 纳米颗粒均匀地支撑在 NCNTs 表面。X 射线光电子能谱（XPS）显示氮主要以石墨态存在于 NCNTs 中。铂钯/NCNTs 催化剂的电催化活性通过 CO 汽提伏安法、循环伏安法（CV）和时变法（CA）进行了测试。电化学表征结果表明，PtPd/NCNTs 催化剂对甲酸氧化具有更高的电催化活性和稳定性。同时，其正向峰值电流密度（549.83 mA mg-1）是 PtPd/CNTs 催化剂（120.90 mA mg-1）的 4.5 倍。所开发的 NCNTs 是非常有前途的直接甲酸燃料电池催化剂支持物。

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来源期刊

Ionics 化学-电化学

CiteScore

5.30

自引率

7.10%

发文量

427

审稿时长

2.2 months

期刊介绍： Ionics is publishing original results in the fields of science and technology of ionic motion. This includes theoretical, experimental and practical work on electrolytes, electrode, ionic/electronic interfaces, ionic transport aspects of corrosion, galvanic cells, e.g. for thermodynamic and kinetic studies, batteries, fuel cells, sensors and electrochromics. Fast solid ionic conductors are presently providing new opportunities in view of several advantages, in addition to conventional liquid electrolytes.