A unique approach of in situ functionalization has resulted in the uniform dispersion of Pt nanoparticles on the surface of hexanedioic acid modified electrospun 3D carbon nanofibers (ACNFs). Unlike the traditional mineral acid based oxidation protocols, a facile single-step methodology without any post-treatments is adopted for the carboxylic functionalization of the carbon support. The interconnected 3D nanostructure with an optimal introduction of metal-binding surface functional groups promotes the uniform dispersion of Pt nanoparticles. The resultant Pt-loaded Pt/ACNFs are used for various electrocatalytic reactions. The Pt/ACNFs exhibit excellent electrocatalytic activity with multifunctional ability, promoting the oxygen reduction reaction (ORR) via an efficient 4e⁻ transfer, providing a large electrochemical surface area (119.21 m² g⁻¹) and superior mass activity (684.57 A g⁻¹) for the methanol oxidation reaction (MOR), and demanding minimal overpotential (50 mV) and Tafel slope (35 mV dec⁻¹) for the hydrogen evolution reaction (HER). Thus, the superior electrocatalytic performance of the prepared Pt/ACNFs is definitely attributable to the uniform binding of Pt metal particles with the carefully grafted –COOH functional groups.

中文翻译：

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己二酸介导的互连石墨3D碳纳米纤维的原位官能化作为三官能电催化剂的Pt载体

原位官能化的独特方法导致Pt纳米颗粒均匀分散在己二酸改性的电纺3D碳纳米纤维（ACNFs）的表面上。与传统的基于无机酸的氧化方案不同，碳载体的羧基官能化采用了无需任何后处理的简便的单步方法。具有金属结合表面官能团的最佳引入的互连3D纳米结构可促进Pt纳米颗粒的均匀分散。所得的载有Pt的Pt / ACNFs用于各种电催化反应。Pt / ACNFs具有出色的电催化活性和多功能功能，可通过有效的4e促进氧还原反应（ORR）⁻转移，为甲醇氧化反应（MOR）提供大的电化学表面积（119.21 m ² g ^-1）和优异的质量活性（684.57 A g ^-1），并要求最小的过电势（50 mV）和塔菲尔斜率（35） mV dec ^-1）用于析氢反应（HER）。因此，所制备的Pt / ACNFs优异的电催化性能肯定归因于Pt金属颗粒与精心接枝的–COOH官能团的均匀结合。