Electrocatalytic water oxidation influenced by the ratio between Cu2+ and a multiply branched peptide ligand
| Autor: | Bartosz Setner, Łukasz Szczukowski, Zbigniew Szewczuk, Dávid Lukács, Justyna Brasuń, Tetsuya Ishikawa, József S. Pap, Łukasz Szyrwiel |
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| Rok vydání: | 2019 |
| Předmět: |
inorganic chemicals
chemistry.chemical_classification animal structures integumentary system 010405 organic chemistry Process Chemistry and Technology Peptide General Chemistry Overpotential 010402 general chemistry Branching (polymer chemistry) Electrochemistry 01 natural sciences Catalysis 0104 chemical sciences law.invention Crystallography chemistry law Moiety Electron paramagnetic resonance Stoichiometry |
| Zdroj: | Catalysis Communications. 122:5-9 |
| ISSN: | 1566-7367 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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