Search results for: Mohammad Mahdi Najafpour

Items from 1 to 20 out of 75 results

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In Situ Synthesis of Manganese Oxide as an Oxygen‐Evolving Catalyst: A New Strategy

Zahra Abdi, Robabeh Bagheri, Mohammad Reza Mohammadi, Zhenlun Song, more

Chemistry – A European Journal > 27 > 4 > 1330 - 1336

All studies on oxygen‐evolution reaction by Mn oxides in the presence of cerium(IV) ammonium nitrate (CAN) have been so far carried out by synthesizing Mn oxides in the first step. And then, followed by the investigation of the Mn oxides in the presence of oxidants for oxygen‐evolution reaction (OER). This paper presents a case study of a new and promising strategy for in situ catalyst synthesis by...

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Cover Feature: In Situ Synthesis of Manganese Oxide as an Oxygen‐Evolving Catalyst: A New Strategy (Chem. Eur. J. 4/2021)

Zahra Abdi, Robabeh Bagheri, Mohammad Reza Mohammadi, Zhenlun Song, more

Chemistry – A European Journal > 27 > 4 > 1163 - 1163

So far, all studies on oxygen‐evolution reactions using Mn oxides in the presence of cerium(IV) ammonium nitrate (CAN) have been carried out by synthesizing Mn oxides in the first step, followed by the investigation of the Mn oxides in the presence of oxidants for the oxygen‐evolution reaction (OER). This work presents a case study of a new and promising strategy for in situ catalyst synthesis by...

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A Simple Method for Synthesizing Highly Active Amorphous Iridium Oxide for Oxygen Evolution under Acidic Conditions

Payam Salimi, Mohammad Mahdi Najafpour

Chemistry – A European Journal > 26 > 71 > 17063 - 17068

Water splitting for hydrogen production has been recognized as a promising approach to store sustainable energy. The performance of this method is limited by the oxygen‐evolution reaction. Herein, an approach for synthesizing a highly active oxygen‐evolving catalyst by a one‐step, low‐cost, environmentally friendly, and easy‐to‐perform method is presented, which works by using iridium metal as the...

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Influence of osmolytes on the stability of thylakoid‐based dye‐sensitized solar cells

Roman A. Voloshin, Nathan G. Brady, Sergey K. Zharmukhamedov, Yashar M. Feyziyev, more

International Journal of Energy Research > 43 > 14 > 8878 - 8889

In recent years, there has been considerable interest in incorporating naturally occurring components of the photosynthetic apparatus into man‐made solar cells, because of the high quantum efficiency of photosynthetic reaction centers. One hurdle to overcome regarding the use of native membranes in these devices is their limited lifespans. In this study, we used stabilizers to increase the long‐term...

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Toward Escherichia coli bacteria machine for water oxidation

Mohammad Mahdi Najafpour, Navid Jameei Moghaddam, Leila Hassani, Robabeh Bagheri, more

Photosynthesis Research > 2018 > 136 > 2 > 257-267

Nature uses a Mn oxide-based catalyst for water oxidation in plants, algae, and cyanobacteria. Mn oxides are among major candidates to be used as water-oxidizing catalysts. Herein, we used two straightforward and promising methods to form Escherichia coli bacteria/Mn oxide compounds. In one of the methods, the bacteria template was intact after the reaction. The catalysts were characterized by X-ray...

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Nanosized rhodium oxide for water oxidation: An organometallic precursor for the preparation of rhodium oxide

Mohammad Mahdi Najafpour, Reza Babadi Aghakhanpour, Sepideh Madadkhani, Robabeh Bagheri, more

Applied Organometallic Chemistry > 32 > 3 > n/a - n/a

Electrochemical production of hydrogen from water splitting is a promising process to allow storage of intermittent energies. However, anodic water oxidation, which is a complicated four‐proton, four‐electron transfer process, affects the efficiency of hydrogen generation due to the need to apply large overpotentials. Herein, we synthesized nanosized rhodium(III) oxide by the thermal decomposition...

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An aluminum/cobalt/iron/nickel alloy as a precatalyst for water oxidation

Mohammad Mahdi Najafpour, Somayeh Mehrabani, Robabeh Bagheri, Zhenlun Song, more

International Journal of Hydrogen Energy > 2018 > 43 > 4 > 2083-2090

Among different strategies, water splitting toward hydrogen production is a promising process to store energy from intermittent sources. However, the anodic water oxidation is a bottleneck for water splitting. In this paper, we report an aluminum/cobalt/iron/nickel alloy as a precatalyst for the electrochemical water oxidation. The alloy electrode contains different metal ions including cobalt, iron,...

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Iron oxide on carbon‐based supports as efficient catalysts for organic compounds oxidation

Mojtaba Amini, Mohammad Mahdi Najafpour, Saeideh Salimi, Sakine Ramezani, more

Applied Organometallic Chemistry > 31 > 12 > n/a - n/a

For the first time, iron oxide on carbon aerogel, amine functionalized carbon nanotube, black carbon and carboxylic acid functionalized carbon nanotube in the presence of H₂O₂ was reported as an efficient and stable catalyst for the selective oxidation of sulfides and alcohols. The catalysts were characterized by scanning electron microscopy, energy‐dispersive spectroscopy, transmission electron microscopy,...

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Rethink about electrolyte: Potassium fluoride as a promising additive to an electrolyte for the water oxidation by a nanolayered Mn oxide

Mohammad Mahdi Najafpour, Mohadeseh Zarei Ghobadi, Seyedeh Maedeh Hosseini, Keun Hwa Chae, more

International Journal of Hydrogen Energy > 2017 > 42 > 22 > 15160- 15166

Water oxidation is a bottleneck of the hydrogen production through the water-splitting reaction. Herein, the promising role of fluoride on the water-oxidizing activity of a nanolayered Mn oxide under the electrochemical condition is reported. The experiments show the increase of the water-oxidizing activity of the nanolayered Mn oxide under an electro-water oxidation circumstance in the presence of...

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A proposed mechanism to form nanosized Mn oxides from the decomposition of β-cyclodextrin-Mn complex: Toward nanosized water-splitting catalysts with special morphology

Mohammad Mahdi Najafpour, Babak Kaboudin, Ramin Mostafalu, Mohammad Shahbazy, more

International Journal of Hydrogen Energy > 2017 > 42 > 16 > 11187- 11198

Metal oxides are promising compounds for water-splitting systems toward hydrogen production. One of the most important methods to prepare nanosized metal oxides is the decomposition of metal complexes. Herein, different Mn oxides from the decomposition of β-cyclodextrin-Mn complex in different calcined temperatures were studied by scanning electron microscopy, thermal gravimetric analysis, X-ray diffraction...

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PARAFAC study of bovine serum albumin conformational changes in the interaction with nanosized manganese oxide as a biomimetic model for water-oxidizing complex

Somayyeh Akbarian, Mohammad Mahdi Najafpour, Mohsen Kompany-Zareh

International Journal of Hydrogen Energy > 2017 > 42 > 15 > 9733-9743

Water splitting toward hydrogen production is an important step and a bottleneck for large-scale energy storage in artificial photosynthesis. The effect of metal oxide nanoparticles on the biopolymers behavior and their properties is important in designing new catalysts for water-splitting reaction. Herein, the interaction of bovine serum albumin (BSA) and MnO_x nanoclusters is studied for the first...

article

Lessons from metal oxides to find why Nature selected manganese and calcium for water oxidation

Mohammad Mahdi Najafpour, Mojtaba Amini, Mahdi Ashrafi

International Journal of Hydrogen Energy > 2017 > 42 > 12 > 8539-8544

The problem of finding a way to store energy from abundant sources such as sunlight, wind or geothermal heat is critical. Water splitting toward hydrogen production is a very promising way for the goal. Although the cathodic reaction is of major interest in hydrogen production, the concurrent anodic water oxidation, which provides cheap electrons for the cathodic reaction, is a limitation for hydrogen...

article

Transformation of La0.65Sr0.35MnO3 in electrochemical water oxidation

Mohammad Mahdi Najafpour, Alireza Shirazi Amin, S. Esmael Balaghi, Bahareh Deljoo, more

International Journal of Hydrogen Energy > 2017 > 42 > 12 > 8560-8568

One of the most promising approaches to produce sustainable energy is hydrogen evolution by water splitting. Since water electrolysis is limited by the high overpotential required for the water oxidation reaction, electrocatalysts are applied to reduce the activation energy necessary for this reaction. However, primary catalysts may chemically convert to other compounds during the reaction. Therefore,...

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Mn-containing ZSM-5 type zeolite as a water-oxidizing catalyst: New findings and current controversies

Maasoumeh Khatamian, Sima Heidari, Mohammad Mahdi Najafpour

International Journal of Hydrogen Energy > 2017 > 42 > 12 > 7938-7950

Water-splitting for H₂ and O₂ production is a key reaction toward a clean energy future. However, the water-oxidation is one of the major limiting factors affecting the efficiency of this important reaction. Thus, the development of low-cost and efficient water-oxidizing catalysts is a key challenge in the artificial photosynthesis field. In this work, Mn-containing ZSM-5 type zeolite was synthesized...

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From manganese complexes to nano-sized manganese oxides as water-oxidizing catalysts for artificial photosynthetic systems: Insights from the Zanjan team

Mohammad Mahdi Najafpour

Comptes Rendus Chimie > 2017 > 20 > 3 > 243-260

On the occasion of the international year of light and light-based technologies, I provide a short overview of our recent findings and personal view on the Mn-based water-oxidizing catalysts and the related sophisticated strategies toward water oxidation, which are promising in the artificial photosynthetic systems.

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Manganese oxides supported on nano-sized metal oxides as water-oxidizing catalysts for water-splitting systems: 3-Electrochemical studies

Mohammad Mahdi Najafpour, Sepideh Madadkhani, Mojtaba Tavahodi

International Journal of Hydrogen Energy > 2017 > 42 > 1 > 60-67

Hydrogen formation by water splitting is very promising to store energy. Water oxidation in water splitting significantly affects the efficiency of hydrogen generation due to the need to apply high overpotential. Among of different compounds, Mn oxides are promising water-oxidizing catalysts. Herein we study the electrochemistry of Mn oxide supported on KAl₃(SO₄)₂(OH)₆, Co₃O₄, CuO, Fe₃O₄, MgO, NiO,...

article

Nanosized manganese oxide supported on carbon black: A new, cheap and green composite for water oxidation

Mohammad Mahdi Najafpour, Saeideh Salimi, Rasoul Safdari

International Journal of Hydrogen Energy > 2017 > 42 > 1 > 255-264

Water splitting is a very promising method to produce hydrogen. However, water oxidation is a crucial step for hydrogen production since it can provide cheap electrons for proton reduction. Herein a nanosized Mn oxide immobilized on carbon black as a reasonable catalyst for water oxidation is reported. The composites were synthesized by a simple, low-cost procedure using different ratios of carbon...

article

Toward a nanosized iron based water-oxidizing catalyst

Mohammad Mahdi Najafpour, Seyedeh Maedeh Hosseini

International Journal of Hydrogen Energy > 2016 > 41 > 48 > 22635- 22642

Water oxidation is a key step and a bottleneck for large-scale energy storage in artificial photosynthesis. Herein Fe oxide on the surface of fluorine-doped tin oxide electrode was synthesized by a very simple, new and low-cost method, using the reduction of K₂FeO₄ in water. The electrode was characterized by scanning electron microscopy, transmission electron microscopy, energy dispersive spectrometry,...

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Nano-sized manganese oxide coated sea sand: A new water-oxidizing catalyst

Mohammad Mahdi Najafpour, Emad Amini, Sepideh Madadkhani

International Journal of Hydrogen Energy > 2016 > 41 > 48 > 22866- 22875

H₂ production by water splitting is a promising fuel to store the intermittent energies. However, water splitting is limited by water oxidation. Herein for the first time we used sea sand for support of nano-sized Mn oxide to obtain a new water-oxidizing catalyst. The compound was synthesized by a simple method and characterized by some methods. The water-oxidizing activities of the compound were...

article

Treated nanolayered Mn oxide by potassium fluoride: An improvement for nanolayered Mn oxide toward water oxidation

Mohammad Mahdi Najafpour, Seyedeh Maedeh Hosseini, Mohadeseh Zarei Ghobadi, Parvin Rafighi, more

International Journal of Hydrogen Energy > 2016 > 41 > 46 > 21203- 21211

Water splitting can store sustainable energies in the form of fuel (H₂) and oxidant (O₂). However, the efficiency of H₂ production from the reaction is limited by the slow kinetics of the water oxidation. Herein the promising role of fluoride on water-oxidizing activity of nanolayered Mn oxide is reported. The effects were studied for water oxidation in the presence of cerium(IV) ammonium nitrate...

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Search results for: Mohammad Mahdi Najafpour

In Situ Synthesis of Manganese Oxide as an Oxygen‐Evolving Catalyst: A New Strategy

Cover Feature: In Situ Synthesis of Manganese Oxide as an Oxygen‐Evolving Catalyst: A New Strategy (Chem. Eur. J. 4/2021)

A Simple Method for Synthesizing Highly Active Amorphous Iridium Oxide for Oxygen Evolution under Acidic Conditions

Influence of osmolytes on the stability of thylakoid‐based dye‐sensitized solar cells

Toward Escherichia coli bacteria machine for water oxidation

Nanosized rhodium oxide for water oxidation: An organometallic precursor for the preparation of rhodium oxide

An aluminum/cobalt/iron/nickel alloy as a precatalyst for water oxidation

Iron oxide on carbon‐based supports as efficient catalysts for organic compounds oxidation

Rethink about electrolyte: Potassium fluoride as a promising additive to an electrolyte for the water oxidation by a nanolayered Mn oxide

A proposed mechanism to form nanosized Mn oxides from the decomposition of β-cyclodextrin-Mn complex: Toward nanosized water-splitting catalysts with special morphology

PARAFAC study of bovine serum albumin conformational changes in the interaction with nanosized manganese oxide as a biomimetic model for water-oxidizing complex

Lessons from metal oxides to find why Nature selected manganese and calcium for water oxidation

Transformation of La0.65Sr0.35MnO3 in electrochemical water oxidation

Mn-containing ZSM-5 type zeolite as a water-oxidizing catalyst: New findings and current controversies

From manganese complexes to nano-sized manganese oxides as water-oxidizing catalysts for artificial photosynthetic systems: Insights from the Zanjan team

Manganese oxides supported on nano-sized metal oxides as water-oxidizing catalysts for water-splitting systems: 3-Electrochemical studies

Nanosized manganese oxide supported on carbon black: A new, cheap and green composite for water oxidation

Toward a nanosized iron based water-oxidizing catalyst

Nano-sized manganese oxide coated sea sand: A new water-oxidizing catalyst

Treated nanolayered Mn oxide by potassium fluoride: An improvement for nanolayered Mn oxide toward water oxidation

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