Preparation of carbon nanotubes / Pt Black composite and its application for electro-catalysis of hydrogen evolution reaction

Subject Areas :

ابراهیم شجاعی ¹ , شهلا فتحی ² , فرشته چکین ^{3 *}

1 - کارشناسی ارشد، گروه شیمی، دانشگاه آزاد اسلامی واحد آیت ا... آملی، آمل، ایران
2 - استادیار شیمی تجزیه، دانشگاه آزاد اسلامی واحد آیت ا... آملی ، آمل، ایران
3 - دانشیار شیمی تجزیه، دانشگاه آزاد اسلامی واحد آیت ا... آملی ، آمل، ایران

Received: 2018-03-11 Accepted : 2018-07-11 Published : 2018-08-23

Keywords: Electrocatalysis, Platinum black, Hydrogen evolution reaction, Carbon nanotub,

Abstract :

n this work, the carbon nanotubes/platinum black composite was prepared by easy, efficient, and cheap method and morphology of composite was investigated by using tunnelling electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDX). The TEM images showed that Pt was immobilized like rosary seeds on external walls of carbon nanotubes and the Pt in EDX spectra confirmed presence of Pt element in composite. Then catalytic activity of this nanocomposite was investigated using carbon paste electrode modified with this nanocomposite for hydrogen evolution reaction in acidic media by electrochemical methods such as linear sweep voltammetry. The linear sweep voltammetry of Pt-CNT/CPE electrode exhibits higher current density and less negative value of potential towards hydrogen evolution reaction than the CPE. Effects of different parameters such as electrolyte type, electrolyte concentration, and platinum black/carbon nanotubes ratio were studied for electrocatalysis of hydrogen evolution reaction. The results showed that sulphuric acid 0.1 M and 2:5 ratio was choice as optimum condition for hydrogen evolution reaction. The deposition of this nanocomposite on the electrode caused onset potential of -0.2 V and the lowest Tafel slope of 4.0 V-1 dec-1 for hydrogen evolution reaction. The electron transfer coefficient and exchange current density for the Pt-CNT/CPE were calculated by Tafel plot about 1.3 and 0.12 mA cm-2, respectively for hydrogen evolution reaction.

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