Electrocatalytic water oxidation influenced by the ratio between Cu2+ and a multiply branched peptide ligand

Łukasz Szyrwiel, Dávid Lukács, Tetsuya Ishikawa, Justyna Brasun, Łukasz Szczukowski, Zbigniew Szewczuk, Bartosz Setner, J. Pap

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A multiply branched peptide, H-Gly-Dap(H-Gly)-Dap(H-Gly-Dap(H-Gly))-Gly-NH2 (Dap = L-2,3-diaminopropionic acid) has been designed to furnish multi-Cu2+ centers exhibiting electrocatalytic activity in water oxidation. Each branching moiety serves as binding pocket for one cupric ion. UV–vis, CD and EPR spectroscopy suggest {NH2,N,N,NH2}eq set for the first two coordinated Cu2+ ions, whereas a different mode for the third that in turn changes the electrochemical behavior of the complex. This third Cu2+ triggers water oxidation at lower (~60 mV) overpotential, increased catalytic current and 4 times as high O2 evolution rate compared to the 2:1 metal-to-ligand stoichiometry.

Original languageEnglish
Pages (from-to)5-9
Number of pages5
JournalCatalysis Communications
Volume122
DOIs
Publication statusPublished - Mar 10 2019

    Fingerprint

Keywords

  • Branched peptide
  • Copper
  • Peptide
  • Water oxidation

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Process Chemistry and Technology

Cite this