Dual active sites fabricated through atomic layer deposition of TiO2 on MoS2 nanosheet arrays for highly efficient electroreduction of CO2 to ethanol

2021 ◽  
Vol 9 (11) ◽  
pp. 6790-6796
Author(s):  
Feixuanyu Qi ◽  
Kang Liu ◽  
De-Kun Ma ◽  
Fangfang Cai ◽  
Min Liu ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Active Sites ◽  
Regulatory Mechanism ◽  
Coupling Reaction ◽  
Atomic Layer ◽  
Reduction Reaction ◽  
Layer Deposition ◽  
Nanosheet Arrays ◽  
Mos2 Nanosheet ◽  
Co Coupling

Ultrathin TiO2/MoS2 nanosheet arrays containing dual active sites could achieve efficient CO2 reduction reaction toward ethanol. A new regulatory mechanism of the CO coupling reaction was proposed based on experimental results and DFT calculations.

Atomic Layer Deposition of Pt on Tungsten Monocarbide (WC) for the Oxygen Reduction Reaction

2011 ◽  
Vol 115 (9) ◽  
pp. 3709-3715 ◽  
Author(s):  
Irene J. Hsu ◽  
Danielle A. Hansgen ◽  
Brian E. McCandless ◽  
Brian G. Willis ◽  
Jingguang G. Chen
Keyword(s):  
Atomic Layer Deposition ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Atomic Layer ◽  
Reduction Reaction ◽  
Layer Deposition ◽  
Tungsten Monocarbide

Preparation by atomic layer deposition and characterization of active sites in nanodispersed vanadia/titania/silica catalysts

2004 ◽  
Vol 91-92 ◽  
pp. 67-71 ◽  
Author(s):  
Jetta Keränen ◽  
Paolo Carniti ◽  
Antonella Gervasini ◽  
Eero Iiskola ◽  
Aline Auroux ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Active Sites ◽  
Atomic Layer ◽  
Layer Deposition

scholarly journals Atomic Layer-by-Layer Deposition of Platinum on Palladium Octahedra for Enhanced Catalysts toward the Oxygen Reduction Reaction

ACS Nano ◽  
2015 ◽  
Vol 9 (3) ◽  
pp. 2635-2647 ◽  
Author(s):  
Jinho Park ◽  
Lei Zhang ◽  
Sang-Il Choi ◽  
Luke T. Roling ◽  
Ning Lu ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Atomic Layer ◽  
Reduction Reaction ◽  
Layer By Layer ◽  
Layer Deposition

scholarly journals In situ tuning of electronic structure of catalysts using controllable hydrogen spillover for enhanced selectivity

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Mi Xiong ◽  
Zhe Gao ◽  
Peng Zhao ◽  
Guofu Wang ◽  
Wenjun Yan ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Active Sites ◽  
Pt Nanoparticles ◽  
Atomic Layer ◽  
Hydrogen Spillover ◽  
General Strategy ◽  
Layer Deposition ◽  
Styrene Derivatives ◽  
Enhanced Selectivity

Abstract In situ tuning of the electronic structure of active sites is a long-standing challenge. Herein, we propose a strategy by controlling the hydrogen spillover distance to in situ tune the electronic structure. The strategy is demonstrated to be feasible with the assistance of CoOx/Al2O3/Pt catalysts prepared by atomic layer deposition in which CoOx and Pt nanoparticles are separated by hollow Al2O3 nanotubes. The strength of hydrogen spillover from Pt to CoOx can be precisely tailored by varying the Al2O3 thickness. Using CoOx/Al2O3 catalyzed styrene epoxidation as an example, the CoOx/Al2O3/Pt with 7 nm Al2O3 layer exhibits greatly enhanced selectivity (from 74.3% to 94.8%) when H2 is added. The enhanced selectivity is attributed to the introduction of controllable hydrogen spillover, resulting in the reduction of CoOx during the reaction. Our method is also effective for the epoxidation of styrene derivatives. We anticipate this method is a general strategy for other reactions.

scholarly journals Atomic layer deposited Pt-Ru dual-metal dimers and identifying their active sites for hydrogen evolution reaction

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Lei Zhang ◽  
Rutong Si ◽  
Hanshuo Liu ◽  
Ning Chen ◽  
Qi Wang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Active Sites ◽  
Rational Design ◽  
Atomic Layer ◽  
Single Atom ◽  
Structure Model ◽  
Layer Deposition ◽  
Dual Metal ◽  
X Ray Absorption ◽  
Excellent Stability

Abstract Single atom catalysts exhibit particularly high catalytic activities in contrast to regular nanomaterial-based catalysts. Until recently, research has been mostly focused on single atom catalysts, and it remains a great challenge to synthesize bimetallic dimer structures. Herein, we successfully prepare high-quality one-to-one A-B bimetallic dimer structures (Pt-Ru dimers) through an atomic layer deposition (ALD) process. The Pt-Ru dimers show much higher hydrogen evolution activity (more than 50 times) and excellent stability compared to commercial Pt/C catalysts. X-ray absorption spectroscopy indicates that the Pt-Ru dimers structure model contains one Pt-Ru bonding configuration. First principle calculations reveal that the Pt-Ru dimer generates a synergy effect by modulating the electronic structure, which results in the enhanced hydrogen evolution activity. This work paves the way for the rational design of bimetallic dimers with good activity and stability, which have a great potential to be applied in various catalytic reactions.

scholarly journals Surface Modification and Enhancement of Ferromagnetism in BiFeO3 Nanofilms Deposited on HOPG

Nanomaterials ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1990 ◽  
Author(s):  
Shikhgasan Ramazanov ◽  
Dinara Sobola ◽  
Farid Orudzhev ◽  
Alexandr Knápek ◽  
Josef Polčák ◽  
...  
Keyword(s):  
Active Sites ◽  
Room Temperature ◽  
Magnetic Measurements ◽  
Pyrolytic Graphite ◽  
Atomic Layer ◽  
Active Centers ◽  
Layer Deposition ◽  
Strong Hybridization ◽  
Two Phases

BiFeO3 (BFO) films on highly oriented pyrolytic graphite (HOPG) substrate were obtained by the atomic layer deposition (ALD) method. The oxidation of HOPG leads to the formation of bubble regions creating defective regions with active centers. Chemisorption occurs at these active sites in ALD. Additionally, carbon interacts with ozone and releases carbon oxides (CO, CO2). Further annealing during the in situ XPS process up to a temperature of 923 K showed a redox reaction and the formation of oxygen vacancies (Vo) in the BFO crystal lattice. Bubble delamination creates flakes of BiFeO3-x/rGO heterostructures. Magnetic measurements (M–H) showed ferromagnetism (FM) at room temperature Ms ~ 120 emu/cm3. The contribution to magnetization is influenced by the factor of charge redistribution on Vo causing the distortion of the lattice as well as by the superstructure formed at the boundary of two phases, which causes strong hybridization due to the superexchange interaction of the BFO film with the FM sublattice of the interface region. The development of a method for obtaining multiferroic structures with high FM values (at room temperature) is promising for magnetically controlled applications.

scholarly journals Size effect of the active sites in UiO-66-supported nickel catalysts synthesized via atomic layer deposition for ethylene hydrogenation

2017 ◽  
Vol 4 (5) ◽  
pp. 820-824 ◽  
Author(s):  
Zhanyong Li ◽  
Aaron W. Peters ◽  
Jian Liu ◽  
Xuan Zhang ◽  
Neil M. Schweitzer ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Size Effect ◽  
Active Sites ◽  
Metal Organic Framework ◽  
Atomic Layer ◽  
Nickel Catalysts ◽  
Ethylene Hydrogenation ◽  
Layer Deposition ◽  
Metal Organic ◽  
Supported Nickel Catalysts

Ni(ii) ions have been deposited on the Zr6 nodes of a metal–organic framework (MOF), UiO-66, via an ALD-like process (ALD = atomic layer deposition).

scholarly journals Design of efficient mono-aminosilane precursors for atomic layer deposition of SiO2 thin films

RSC Advances ◽  
2017 ◽  
Vol 7 (37) ◽  
pp. 22672-22678 ◽  
Author(s):  
Liang Huang ◽  
Bo Han ◽  
Maohong Fan ◽  
Hansong Cheng
Keyword(s):  
Thin Films ◽  
Atomic Layer Deposition ◽  
Dft Calculations ◽  
Atomic Layer ◽  
Layer Deposition

The suitability of six mono(alkylamino)silane precursors for growing SiO2 films via ALD is assessed with DFT calculations.

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