g-C3N4 /polymeric metallophthalocyanine as novel electrocatalysts for oxygen evolution reaction


Akyüz D., DEMİRBAŞ Ü.

International Journal of Hydrogen Energy, 2024 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Publication Date: 2024
  • Doi Number: 10.1016/j.ijhydene.2024.02.131
  • Journal Name: International Journal of Hydrogen Energy
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Artic & Antarctic Regions, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, Environment Index, INSPEC
  • Keywords: Alkaline electrolyte, Electrocatalysts, Electropolymerization, Graphitic carbon nitride, Oxygen evolution reaction, Phthalocyanines
  • Karadeniz Technical University Affiliated: Yes

Abstract

In this work, non-peripherally tetra 3-(4-(4-acetylpiperazin-1-yl)phenoxy) substituted nickel(II) phthalocyanine (NiPc), cobalt(II) phthalocyanine (CoPc), zinc(II) phthalocyanine (ZnPc), copper(II) phthalocyanine (CuPc) and lead(II) phthalocyanine (PbPc) were synthesized. The structural characterization of the novel compounds was performed by a combination of instrumental methods. The electrochemical and in-situ spectroelectrochemical responses of the compounds were recorded and redox properties were illuminated. Graphitic carbon nitride(g-C3N4) was synthesized by thermal decomposition of urea and combined with metallophthalocyanines to avoid agglomeration of phthalocyanine, to obtain homogeneous microstructured catalyst and to provide synergistic effects between pyridinic N-metal bonds of g-C3N4 and metallophthalocyanines (MPcs). The synthesized compounds were electropolymerized onto g-C3N4 thanks to piperazin substitute groups. The oxygen evolution reaction (OER) of g-C3N4/Poly-MPcs was investigated in alkaline electrolyte (1 M KOH). The g-C3N4/Poly-NiPc exhibited excellent electrocatalytic performance with low overpotential and Tafel slope, respectively, 380 mV@ 10 mA cm−2 and 80 mVdec−1, which is superior to the g-C3N4. Moreover, g-C3N4/Poly-NiPc electrocatalyst exhibited ∼100 times higher current density than g-C3N4.