Engineered polypeptide around nano-sized manganese–calcium oxide as an artificial water-oxidizing enzyme mimicking natural photosynthesis: Toward artificial enzymes with highly active site densities

Mohammad Mahdi Najafpour, Sepideh Madadkhani, Zahra Zand, Małgorzata Hołyńska, Suleyman Allakhverdiev

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The solar energy is intermittent, and thus, to be practical at a huge scale, will require a large capability for energy storage. One approach involves artificial photosynthesis to drive solar energy for water splitting into hydrogen or to reduce CO2 to reduced carbon fuels. In such reactions, cheap electrons from water oxidation are critical. Herein we aim to design and synthesize an artificial water-oxidizing enzyme with highly active site densities, report on nano-sized Mn–Ca oxide in two engineered polypeptides (Arg-Arg-Glu-Glu-Glu-Glu-Arg-Arg and Tyr-Tyr-Tyr-Glu-Glu-Glu-Glu-His-Tyr-Tyr-Tyr) as structural models for biological water-oxidizing site in plants, algae, and cyanobacteria. The compounds were synthesized by a simple procedure and characterized with multiple methods. Using Nafion, electrochemical studies show the peptide has an important effect on the potential for Mn(III)/Mn(IV) oxidation on Mn–Ca oxide and it is decreased in the presence of the polypeptide. We also found that the peptide has an important role on morphologies of Mn–Ca oxide.

Original languageEnglish
Pages (from-to)17826-17836
Number of pages11
JournalInternational Journal of Hydrogen Energy
Volume41
Issue number40
DOIs
Publication statusPublished - Oct 26 2016
Externally publishedYes

Keywords

  • Artificial enzyme
  • Electrochemistry
  • Engineered polypeptides
  • Hydrogen production
  • Nano-sized manganese oxide
  • Water-oxidizing enzyme

ASJC Scopus subject areas

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

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