Electrocatalytic hydrogen evolution reaction with a supramolecular cobalt(II)phthalocyanine carrying four cobaloxime moieties

İbrahim Özçeşmeci, Aykut Demir, Duygu Akyüz, Atıf Koca, Ahmet Gül*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


A supramolecular cobalt phthalocyanine (CoPc) bearing four redox active cobaloxime (CoDMG) substituents ((CoDMG)4-CoPc) was synthesized and electrochemically characterized in order to determine its functionalities for practical usages as effective electrocatalysts. Voltammetric analyses of CoDMG, CoPc, and (CoDMG)4-CoPc indicated redox activity of each compounds and supported substitution of CoPc with CoDMG. (CoDMG)4-CoPc showed three CoPc based reduction processes and two CoDMG based reduction processes. While CoDMG showed two reduction and one oxidation processes, CoPc illustrated three reduction and two oxidation processes. Binding of CoDMG to CoPc increased the reduction processes to five. Multi-electron and metal and/or ring based redox processes showed worthy of the (CoDMG)4-CoPc for using as an electrocatalyst. Shifting of the proton reduction reaction toward the positive potentials indicated electrocatalytic activities of the complexes for the hydrogen evolution reaction (HER). Among CoDMG, CoPc, and (CoDMG)4-CoPc, modified glassy carbon electrode with (CoDMG)4-CoPc illustrated the highest electrocatalytic activity and it decreased the over-potential of the bare electrode about 360 mV and increased the current density of the electrode about 10-fold.

Original languageEnglish
Pages (from-to)591-598
Number of pages8
JournalInorganica Chimica Acta
Publication statusPublished - 2017

Bibliographical note

Publisher Copyright:
© 2017


This work was supported by the Research Funds of the TÜBİTAK (Project No: 113M991) and Technical University of Istanbul. AG and AK thank Turkish Academy of Sciences (TUBA) for partial support.

FundersFunder number
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu113M991
Türkiye Bilimler Akademisi
Istanbul Teknik Üniversitesi


    • Electrocatalyst
    • Hydrogen evolution reaction
    • Phthalocyanine
    • Supramolecule


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