A5047640712- Electrocatalysts for Energy Conversion
- Electrochemical Analysis and Applications
- Advanced battery technologies research
- Photosynthetic Processes and Mechanisms
- Copper-based nanomaterials and applications
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Catalytic Processes in Materials Science
- Advanced Photocatalysis Techniques
- Porphyrin and Phthalocyanine Chemistry
- Metal-Catalyzed Oxygenation Mechanisms
- Electrochemical sensors and biosensors
- Oxidative Organic Chemistry Reactions
- Metal complexes synthesis and properties
- Algal biology and biofuel production
- Spectroscopy and Quantum Chemical Studies
- Supercapacitor Materials and Fabrication
- Magnetism in coordination complexes
- Crystallography and molecular interactions
- Iron oxide chemistry and applications
- Crystal structures of chemical compounds
- Metal-Organic Frameworks: Synthesis and Applications
- Fuel Cells and Related Materials
- Microbial Fuel Cells and Bioremediation
- TiO2 Photocatalysis and Solar Cells
Sharif University of Technology
2007-2025
Institute for Advanced Studies in Basic Sciences
2015-2024
University of Ottawa
2019-2022
Committee on Climate Change
2013-2021
Office of Basic Energy Sciences
2019
University College London
2017-2018
Technical University of Denmark
2016-2017
Pusan National University
2016
University of Zanjan
2014-2015
Kiel University
2010-2011
Biomimetic and efficient: Mixed calcium manganese(III) oxides (see structure; Ca green, Mn red, O white) with elemental compositions structures mimicking the active site of photosystem II were found to be highly catalysts for oxidation water molecular oxygen. As PS II, presence Ca2+ greatly enhances catalyst performance in comparison related manganese-only system Mn2O3. Detailed facts importance specialist readers are published as "Supporting Information". Such documents peer-reviewed, but...
In the worldwide search for sustainable energy technologies, water oxidation by abundant low-cost materials is of key importance. nature, this process efficiently catalyzed an intricate manganese–calcium (Mn4Ca) complex bound to proteins photosystem II (PSII). Recently synthetic oxides were found be active catalysts but at atomic level their structure has remained elusive. To investigate these amorphous catalysts, extended-range X-ray absorption spectroscopy (XAS) K-edges both manganese and...
The Oxygen Evolving Complex (OEC) in photosystem II, a cluster that contains four manganese and one calcium ions bridged by five oxygen atoms distorted chair like arrangement, carries out the biological oxidation of water during photosynthesis. Since this is only established catalysis, efforts have been made to develop synthetic systems mimic its structure, properties activity. This perspective provides brief overview current structural mechanistic understanding OEC II. It then compares...
A binuclear manganese molecular complex [(OH2)(terpy)Mn(μ-O)2Mn(terpy)(OH2)](3+) (1) is the most prominent structural and functional model of water-oxidizing Mn operating in plants cyanobacteria. Supported on montmorillonite clay using Ce(IV) as a chemical oxidant, 1 has been reported to be one best Mn-based catalysts toward water oxidation. By X-ray absorption spectroscopy kinetic analysis oxygen evolution reaction, we show that transformed into layered type Mn-oxide particles which are...
Abstract In this study, we investigate the effect of K 2 FeO 4 , as a new and soluble Fe salt at alkaline conditions, on oxygen-evolution reaction (OER) Ni oxide. Both oxidation reduction peaks for in presence absence are linearly changed by (scan rate) 1/2 . Immediately after interaction [FeO ] 2- with surface electrode, significant increase OER is observed. This could be indicative fact that either oxide directly involved OER, or, it important to activate toward OER. Due change...
This study explores the mysteries of oxygen-evolution reaction (OER) in presence Ni(Fe) (hydr)oxides and examines effects Ni Fe impurities on reaction. The current methods for removing could complicate OER. A crucial aspect this is reinvestigation a Ni/Fe-free electrolyte during It widely recognized that (hydr)oxide phase, possessing an active phase OER, forms surface foil air, even absence any applied potential. observed after saturation electrode surface, additional has no significant...
Dinickel phosphide (Ni2P), an efficient electrocatalyst derived from commonly available elements, shows a noteworthy performance in the hydrogen evolution reaction (HER). This research includes extensive analysis using diverse characterization techniques, including scanning electron microscopy, transmission energy dispersive spectrometry, X-ray diffraction, absorption spectroscopy (XAS), paramagnetic resonance (EPR), and situ Raman spectroscopy, revealing structural change of Ni2P particles...
This study challenges the conventional understanding of nickel (hydr)oxides as inefficient catalysts for oxygen-evolution reaction (OER) under alkaline conditions. It is demonstrated that oxyhydroxide, characterized by several methods, forms on Ni foam's surface and exhibits OER activity at extremely low potentials. becomes particularly notable peak Ni(II) oxidation to Ni(III), which follows charge accumulation. Remarkably, this mesoporous, super hydrophilic, high-surface-area catalyst...
Previous measurements show that calcium manganese oxide nanoparticles are better water oxidation catalysts than binary oxides (Mn 3 O 4 , Mn 2 and MnO ). The probable reasons for such enhancement involve a combination of factors: materials have layered structure with considerable thermodynamic stability high surface area, their low energy suggests relatively loose binding H on the internal external surfaces, they possess mixed-valent enthalpy independent 3+ /Mn 4+ ratio much smaller in...
A nano-size amorphous calcium–manganese oxide shows efficient water oxidation activity in the presence of cerium(IV) ammonium nitrate.
Abstract Oxygen evolution catalysed by calcium manganese and manganese‐only oxides was studied in 18 O‐enriched water. Using membrane‐inlet mass spectrometry, we monitored the formation of different O 2 isotopologues 16 , such reactions simultaneously with good time resolution. From analysis data, conclude that entirely pathways dioxygen catalysis exist for involving hydrogen peroxide (H ), persulfate (HSO 5 − ) or single‐electron oxidants as Ce IV [Ru III (bipy) 3 ] 3+ . Like oxide...
According to UV-visible spectroscopy, X-ray diffraction spectrometry, dynamic light scattering, Fourier transform infrared electron paramagnetic resonance transmission microscopy, scanning microscopy and photoelectron nano-sized manganese oxides are proposed as active catalysts for water oxidation in the reaction of some complexes cerium(IV) ammonium nitrate.
Nano-sized particles of manganese oxides have been prepared by a very simple and cheap process using decomposing aqueous solution nitrate at 100 °C. Scanning electron microscopy, transmission microscopy X-ray diffraction spectrometry used to characterize the phase morphology oxide. The nano-sized oxide shows efficient catalytic activity toward water oxidation epoxidation olefins in presence cerium(IV) ammonium hydrogen peroxide, respectively.
We, for the first time, report that many Mn oxides (Mn3O4, α-Mn2O3, β-MnO2, CaMnO3, Ca2Mn3O8, CaMn3O6 and CaMn4O8) in presence of cerium(IV) ammonium nitrate, water oxidation, convert to layered oxide. This oxide is an efficient oxidizing catalyst.
CaMnO3 and Ca2Mn3O8 were synthesized characterized by SEM, XRD, FTIR BET. Both oxides showed oxygen evolution activity in the presence of oxone, cerium(IV) ammonium nitrate H2O2. Oxygen from water during irradiation with visible light (λ > 400 nm) was also observed upon adding these manganese to an aqueous solution containing tris(2,2′-bipyridyl) ruthenium(II), as photosensitizer, chloro pentaammine cobalt(III) chloride, electron acceptor, acetate buffer. The amounts dissolved calcium...