Theoretical and Experimental Investigations on Single-Atom Catalysis: Ir1/FeOx for CO Oxidation

Liang, Jin Xia; Lin, Jian; Yang, Xiao Feng; Wang, Aiqin; Qiao, Botao; Liu, Jingyue; Zhang, Tao; Li, Jun

doi:10.1021/jp503769d

Cited by 154 publications

(168 citation statements)

References 45 publications

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“…[104] An independent study later found that Pd 1 /FeO x should be more active. [108] Thep erformance of many of the systems identified has yet to be confirmed experimentally, and in some cases the synthesis has still not been reported. [108] Thep erformance of many of the systems identified has yet to be confirmed experimentally, and in some cases the synthesis has still not been reported.…”

Section: Methodsmentioning

confidence: 99%

The Multifaceted Reactivity of Single‐Atom Heterogeneous Catalysts

2018

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Single-atom heterogeneous catalysts (SACs) attached to carefully chosen hosts are attracting considerable interest; principally because they offer maximum utilization per metal atom and are usually readily recyclable. However, diminution of the atomic population of nanoparticles or nanoclusters to single atoms can significantly alter reactivity because of the consequent changes in the active-site structure. By examining various diverse applications, we ascertain whether the performance of SACs is enhanced or suppressed. We also note that SACs generally display unique kinds of catalytic cycles. The choice of host is crucial since it influences both the electronic and steric environment of the metal center. Moreover, it may function as a cocatalyst. All these aspects impact upon the design of new SACs, which exhibit similarities to hetero- and homogeneous predecessors. Additionally, SACs offer a viable replacement of soluble metal complexes in processes that remain difficult to heterogenize.

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Section: Methodsmentioning

confidence: 99%

The Multifaceted Reactivity of Single‐Atom Heterogeneous Catalysts

2018

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“…Activity for various reactions has so far been demonstrated for metals including Ir [483], Au [484], Pt [485][486][487][488], and this has motivated theoretical studies aimed at understanding how it is that a single atom can function as a catalyst [489]. Unfortunately, the complexity of the "FeO x " support, usually a reduced α-Fe 2 O 3 , means that the termination of the oxide is not known.…”

Section: Metalsmentioning

confidence: 99%

Iron oxide surfaces

Parkinson

2016

Surface Science Reports

487

463

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The current status of knowledge regarding the surfaces of the iron oxides, magnetite (Fe 3 O 4 ), maghemite (γ-Fe 2 O 3 ), hematite (α-Fe 2 O 3 ), and wüstite (Fe 1-x O) is reviewed. The paper starts with a summary of applications where iron oxide surfaces play a major role, including corrosion, catalysis, spintronics, magnetic nanoparticles (MNPs), biomedicine, photoelectrochemical water splitting and groundwater remediation. The bulk structure and properties are then briefly presented; each compound is based on a close-packed anion lattice, with a different distribution and oxidation state of the Fe cations in interstitial sites. The bulk defect chemistry is dominated by cation vacancies and interstitials (not oxygen vacancies) and this provides the context to understand iron oxide surfaces, which represent the front line in reduction and oxidation processes. The atomic-scale structure of the low-index surfaces of iron oxides is the major focus of this review. Fe 3 O 4 is the most studied iron oxide in surface science, primarily because its stability range corresponds nicely to the ultra-high vacuum environment, and because it is an electrical conductor, which makes it straightforward to study with the most commonly used surface science methods such as photoemission spectroscopies (XPS, UPS) and scanning tunneling microscopy (STM). The impact of the surfaces on the measurement of bulk properties such as magnetism, the Verwey transition and the (predicted) half-metallicity is discussed.The best understood iron oxide surface at present is probably Fe 3 O 4 (100); the structure is known with a high degree of precision and the major defects and properties are well characterised. A major factor in this is that a termination at the Fe oct -O plane can be reproducibly prepared by a variety of methods, as long as the surface is annealed in 10 Such straightforward preparation of a monophase termination is generally not the case for other iron oxide surfaces. All available evidence suggests the oft-studied (√2×√2)R45° reconstruction results from a rearrangement of the cation lattice in the outermost unit cell in which two octahedral cations are replaced by one tetrahedral interstitial, a motif conceptually similar to well-known Koch-Cohen defects in Fe (0001) is the most studied hematite surface, but 2 difficulties preparing stoichiometric surfaces under UHV conditions have hampered a definitive determination of the structure. There is evidence for at least three terminations: a bulk-like termination at the oxygen plane, a termination with half of the cation layer, and a termination with ferryl groups. When the surface is reduced the so-called "bi-phase" structure is formed, which eventually transforms to a Fe 3 O 4 (111)-like termination. The structure of the bi-phase surface is controversial; a largely accepted model of coexisting Fe 1-x O and α-Fe 2 O 3 (0001) islands was recently challenged and a new structure based on a thin film of Fe 3 O 4 (111) on α-Fe 2 O 3 (0001) was proposed. The merits of the compet...

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“…10–16 Pt 1 /FeO x was firstly synthesized and utilized as a single atom catalyst for CO oxidation with extremely high activity and stability. 17 Recently, a single Ni atom was successfully doped at lattice defects of graphene and showed exceptional activity for electrochemical hydrogen production 12 due to electronic interactions 18 between the metal and graphene.…”

Section: Introductionmentioning

confidence: 99%

Single-atom catalysts for CO₂ electroreduction with significant activity and selectivity improvements

et al. 2017

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Theoretical and Experimental Investigations on Single-Atom Catalysis: Ir₁/FeO_x for CO Oxidation

Cited by 154 publications

References 45 publications

The Multifaceted Reactivity of Single‐Atom Heterogeneous Catalysts

The Multifaceted Reactivity of Single‐Atom Heterogeneous Catalysts

Iron oxide surfaces

Single-atom catalysts for CO₂ electroreduction with significant activity and selectivity improvements

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Theoretical and Experimental Investigations on Single-Atom Catalysis: Ir1/FeOx for CO Oxidation

Cited by 154 publications

References 45 publications

The Multifaceted Reactivity of Single‐Atom Heterogeneous Catalysts

The Multifaceted Reactivity of Single‐Atom Heterogeneous Catalysts

Iron oxide surfaces

Single-atom catalysts for CO2 electroreduction with significant activity and selectivity improvements

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Product

Resources

About

Theoretical and Experimental Investigations on Single-Atom Catalysis: Ir₁/FeO_x for CO Oxidation

Single-atom catalysts for CO₂ electroreduction with significant activity and selectivity improvements