Polypeptide and Mn-Ca oxide: Toward a biomimetic catalyst for water-splitting systems

Mohammad Mahdi Najafpour, Mohadeseh Zarei Ghobadi, Bahram Sarvi, Sepideh Madadkhani, Davood Jafarian Sedigh, Parvin Rafighi, Mojtaba Tavahodi, Jian Ren Shen, Suleyman I. Allakhverdiev

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


Water oxidation is the bottleneck for hydrogen production by water-splitting systems using sunlight or other sustainable energies. Herein we report nano-sized Mn-Ca oxide in an engineered polypeptide (Glu-Glu-Glu-Glu-Glu-Glu-Glu-His-Val-Val-Val-Val-Val-Val-Val-Val) as a structural model for biological water-oxidizing site in plants, algae, and cyanobacteria. The compound was synthesized by a simple procedure and characterized by transmission electron microscopy, atomic absorption spectroscopy, scanning electron microscopy, energy-dispersive spectroscopy, X-ray diffraction spectrometry, UV-Visible spectroscopy, dynamic light scattering, and some electrochemical methods. Using hydrogen to store sustainable energies is a promising strategy in near future and such nano-sized Mn-Ca oxide/polypeptide is a promising strategy in water-splitting systems to provide cheap electrons from water toward hydrogen production.

Original languageEnglish
Pages (from-to)5504-5512
Number of pages9
JournalInternational Journal of Hydrogen Energy
Issue number12
Publication statusPublished - Apr 6 2016


  • Biomimetic model
  • Hydrogen
  • Nano-sized Mn-Ca oxide
  • Polypeptide
  • Water-oxidizing catalyst

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology


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