Controlling the Oxidation State of Pt Single Atoms for Maximizing Catalytic Activity

2020 ◽  
Vol 59 (46) ◽  
pp. 20691-20696 ◽  
Author(s):  
Hojin Jeong ◽  
Dongjae Shin ◽  
Beom‐Sik Kim ◽  
Junemin Bae ◽  
Sangyong Shin ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Oxidation State ◽  
Single Atoms

Controlling the Oxidation State of Pt Single Atoms for Maximizing Catalytic Activity

2020 ◽  
Vol 132 (46) ◽  
pp. 20872-20877 ◽  
Author(s):  
Hojin Jeong ◽  
Dongjae Shin ◽  
Beom‐Sik Kim ◽  
Junemin Bae ◽  
Sangyong Shin ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Oxidation State ◽  
Single Atoms

Promoting inherent catalytic activity and stability of TiO2 supported Pt single-atoms at CeOx-TiO2 interfaces

2021 ◽  
Author(s):  
Mi Yoo ◽  
Eunji Kang ◽  
Hyuk Choi ◽  
Hyunwoo Ha ◽  
Han Seul Choi ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Catalytic Efficiency ◽  
Reaction Centers ◽  
Next Generation ◽  
Single Atoms ◽  
General Concern

Single-atoms Single-atoms (SAs) with atomically coordinated reaction centers are considered the next generation catalyst that can reveal exceptional catalytic efficiency. However, the general concern about thermodynamic vulnerabilities of the SAs...

scholarly journals A pyrolysis-free path toward superiorly catalytic nitrogen-coordinated single atom

2019 ◽  
Vol 5 (8) ◽  
pp. eaaw2322 ◽  
Author(s):  
Peng Peng ◽  
Lei Shi ◽  
Feng Huo ◽  
Chunxia Mi ◽  
Xiaohong Wu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Temperature ◽  
Oxygen Reduction ◽  
Structural Changes ◽  
Carbon Matrix ◽  
Single Atom ◽  
Synthetic Approach ◽  
Iron Phthalocyanine ◽  
Practical Applications ◽  
Single Atoms

Nitrogen-coordinated single-atom catalysts (SACs) have emerged as a frontier for electrocatalysis (such as oxygen reduction) with maximized atom utilization and highly catalytic activity. The precise design and operable synthesis of SACs are vital for practical applications but remain challenging because the commonly used high-temperature treatments always result in unpredictable structural changes and randomly created single atoms. Here, we develop a pyrolysis-free synthetic approach to prepare SACs with a high electrocatalytic activity using a fully π-conjugated iron phthalocyanine (FePc)–rich covalent organic framework (COF). Instead of randomly creating Fe-nitrogen moieties on a carbon matrix (Fe-N-C) through pyrolysis, we rivet the atomically well-designed Fe-N-C centers via intermolecular interactions between the COF network and the graphene matrix. The as-synthesized catalysts demonstrate exceptional kinetic current density in oxygen reduction catalysis (four times higher than the benchmark Pt/C) and superior power density and cycling stability in Zn-air batteries compared with Pt/C as air electrodes.

A tailored oxide interface creates dense Pt single-atom catalysts with high catalytic activity

2020 ◽  
Vol 13 (4) ◽  
pp. 1231-1239 ◽  
Author(s):  
Mi Yoo ◽  
Young-Sang Yu ◽  
Hyunwoo Ha ◽  
Siwon Lee ◽  
Jin-Seok Choi ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Single Atom ◽  
High Catalytic Activity ◽  
Oxide Interface ◽  
Single Atoms

Catalytic supremacy of Pt-single atoms achieved by CeOx–TiO2 interfaces.

Self-oscillations during methane oxidation over Pd/Al 2 O 3 : Variations of Pd oxidation state and their effect on Pd catalytic activity

2016 ◽  
Vol 522 ◽  
pp. 40-44 ◽  
Author(s):  
V.Yu. Bychkov ◽  
Yu.P. Tulenin ◽  
M.M. Slinko ◽  
A.K. Khudorozhkov ◽  
V.I. Bukhtiyarov ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Methane Oxidation ◽  
Oxidation State

Highly active water oxidation on nanostructured biomimetic calcium manganese oxide catalysts

2016 ◽  
Vol 4 (17) ◽  
pp. 6585-6594 ◽  
Author(s):  
Feng Rong ◽  
Jiao Zhao ◽  
Zheng Chen ◽  
Yuxing Xu ◽  
Yaopeng Zhao ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Manganese Oxide ◽  
Oxidation State ◽  
Water Oxidation ◽  
Oxide Catalysts ◽  
Structural Distortion ◽  
Manganese Oxide Catalysts ◽  
Highly Active

Nanostructured biomimetic birnessite CaxMnOy oxides with an intermediate Mn oxidation state and proper structural distortion show improved catalytic activity for the WOR.

scholarly journals Bimetallic Cooperativity with a 2-Phosphinoimidazole-Derived Pd(II) Dimer Enables Naphthalene Synthesis via dimeric Pd(III) Catalysis

2020 ◽  
Author(s):  
Chloe C. Ence ◽  
S. Hadi Nazari ◽  
Mariur Rodriguez Moreno ◽  
Manase F. Matu ◽  
Samantha G. Kulka ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Dft Calculations ◽  
Oxidation State ◽  
Methyl Ketone ◽  
Methyl Ketones ◽  
Mechanistic Studies ◽  
High Oxidation State ◽  
Pd Catalysts ◽  
Silver Triflate ◽  
High Oxidation

We report the synthesis of bimetallic Pd(I) and Pd(II) complexes scaffolded on bidentate 2-phosphinoimidazole ligands. These complexes display unique catalytic activity and enable the expeditious formation of 1,3-disubstituted naphthalenes via an unprecedented coupling of aryl iodides and methyl ketones in the presence of silver triflate. Excellent substrate scope for naphthalene formation is also demonstrated. Mechanistic studies suggest that the transformation proceeds via Pd-catalyzed arylation of a methyl ketone, followed by cyclization with a second equivalent of ketone. Importantly, this ketone arylation processes occurs under oxidizing conditions, suggesting involvement of higher oxidation state dimeric Pd catalysts. Based on experiments and DFT calculations, we propose a mechanism involving high oxidation state Pd(III) bimetallic catalysis. These new bimetallic complexes possess reactivity that is not seen with monometallic Pd catalysts and we confirm the importance of the palladium catalyst for both arylation and cyclization for naphthalene formation.

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