Enhanced electrocatalytic oxidation of methanol on Au-Pt bimetallic particles modified copper phthalocyanine-carbon nanotube composite electrode

KOÇAK Ç. C., DURSUN Z.

MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS, vol.275, 2022 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 275
  • Publication Date: 2022
  • Doi Number: 10.1016/j.mseb.2021.115485
  • Journal Name: MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: Methanol oxidation, Gold-platinum nanoparticles, Composite electrode, Copper phthalocyanine, Carbon nanotube, GRAPHENE OXIDE, PLATINUM NANOPARTICLES, GOLD NANOPARTICLES, EFFICIENT ELECTROCATALYST, ANODE CATALYST, NANOCOMPOSITE, ELECTROOXIDATION, PERFORMANCE, HYDRAZINE, REDUCTION
  • Dokuz Eylül University Affiliated: Yes

Abstract

In this work, we prepared modified copper phthalocyanine-carbon nanotube (CuPc-CNT) catalysts containing bimetallic (Au-Pt, Au/Pt, Pt/Au) and monometallic nanoparticles (Au or Pt), using a simple electrochemical technique. We investigated the catalyst structural and physical properties by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, thermogravimetric analysis, and electrochemical impedance spectroscopy. The bimetallic systems (Au-Pt/CuPc-CNT > Pt/Au/CuPc-CNT > Au/Pt/CuPc-CNT) proved to have a better current density towards methanol oxidation than that of mono-metallic systems (Pt/CuPc-CNT > Au/CuPc-CNT) in alkaline media. The electrochemical surface area (ECSA) of Au-Pt/CuPc-CNT was found to be 60.25 m(2) g(-1). The methanol oxidation reaction took place with the electron transfer, followed by the catalytic chemical reaction. Thus, the electrochemically-prepared Au-Pt/CuPc-CNT catalyst of the highest stability and enhanced electrocatalytic activity towards methanol oxidation represents a promising candidate for use in alkaline direct methanol fuel cells.