Nano-sized Mn3O4 and β-MnOOH from the decomposition of β-cyclodextrin-Mn: 2. The water-oxidizing activities

Najafpour, Mohammad Mahdi; Mostafalu, Ramin; Hołyńska, Małgorzata; Ebrahimi, Foad; Kaboudin, Babak

doi:10.1016/j.jphotobiol.2015.02.011

Cited by 15 publications

(2 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The water oxidation catalyzed by such Mn oxide composites is usually faster than that for many pure Mn oxide phases [79,80], but similar to or lower than that for layered Mn oxides [81,82].…”

Section: Supportsmentioning

confidence: 99%

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

Najafpour

2016

Comptes Rendus. Chimie

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Supportsmentioning

confidence: 99%

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

Najafpour

2016

Comptes Rendus. Chimie

Self Cite

View full text Add to dashboard Cite

show abstract

“…If the thermodynamic and kinetic limitations of water oxidation reaction (WOR) as a half-reaction of water electrolysis are overcome, an appropriate production method can be achieved . Among different compounds, − the idea of using manganese oxide − for WOR is also interesting because the Mn 4 CaO 5 cluster is the biological WOR catalyst in photosystem II (PS II). − Manganese oxides favor the replacement of noble metal catalysts with WOR catalysts in water splitting. However, improving manganese oxides needs mechanistic, kinetic, and optimistic knowledge of the details of WOR.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Metal Ions between Nanolayers of Manganese Oxide for Water Oxidation Reaction under Acidic Conditions

et al. 2023

Self Cite

View full text Add to dashboard Cite

A new approach is used to synthesize various metal ions [Mg(II), Ca(II), Ba(II), Al(III), Zn(II), Cd(II), Mn(II), Fe(III), Co(III), Ni(II), and Cu(II)] between layers of Mn oxide in a pre-synthesized framework of layered Mn−K oxide. These Mn oxides were heated at 60−600 °C, and their electrochemistry and water oxidation reaction (WOR) were investigated at pH = 1. Using this strategy, the framework of the structure of catalysts is the same, and all are synthesized in a layered Mn oxide containing K(I) framework. Thus, comparing different ions in the same framework is easier. After calcination at 300−600 °C, X-ray absorption spectroscopy shows a layered structure with no change in bulk, but XRD shows that a few conversions regarding layered Mn oxide → α-MnO 2 → α-Mn 2 O 3 occur. Indeed, after calcination at 300−600 °C, the formed layered Mn oxide converts into a better WOR catalyst. After calcination at ≥300 °C, small amounts of α-MnO 2 /α-Mn 2 O 3 are formed in the structure, which could be important for WOR. At 600 °C, trace amounts of crystalline α-Mn 2 O 3 are usually formed in the presence of redox-inert ions, which is not an efficient catalyst for WOR. In the presence of redox-active ions, the formation of metal oxides such as Fe, Co, Ni, and Ni oxides is possible at 600 °C. These metal oxides are usually catalysts for WOR. An open structure of layered Mn oxide could increase the WOR activity of these redox-active ions. Thus, Mn ions may not be active sites for WOR and could be a substrate for these redox-active ions. Among the redox-inert ions between the layers of Mn oxides, the presence of Ca(II) at 500 °C results in a significant increase in WOR. Interestingly, a Ca/Mn cluster is present in the biological WOR catalyst.

show abstract

Manganese Oxoborate‐Based Nanostructures as Novel Oxygen Evolution Catalysts in Neutral Media

et al. 2021

View full text Add to dashboard Cite

The development of electrocatalysts for the OER (oxygen evolution reaction) process is an ongoing challenge in producing sustainable energy systems. Herein, we report QS (quasi‐spherical), IR (irregular), and NR (nanorod) Mn2OBO3 (manganese oxoborate), modified with a carbon support, as candidate electrocatalysts for OER in a neutral medium. QS‐, IR‐ and NR‐Mn2OBO3 catalysts displayed low onset potentials of 201 mV, 205 mV, and 208 mV and Tafel slope results of 94 mV dec−1, 97 mV dec−1, and 106 mV dec−1, respectively. As a result of the long‐term stability tests, it was determined that the NR‐Mn2OBO3 sample was extremely stable compared to the QS‐ and IR‐catalysts. This work introduces a new Mn2OBO3/C composite catalyst that displays efficient OER performance at a neutral medium and provides a different perspective for catalyst development strategies.

show abstract

Nano-sized Mn3O4 and β-MnOOH from the decomposition of β-cyclodextrin-Mn: 2. The water-oxidizing activities

Cited by 15 publications

References 49 publications

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

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

Effect of Different Metal Ions between Nanolayers of Manganese Oxide for Water Oxidation Reaction under Acidic Conditions

Manganese Oxoborate‐Based Nanostructures as Novel Oxygen Evolution Catalysts in Neutral Media

Contact Info

Product

Resources

About