Constructing Hierarchical Interfaces: TiO2-Supported PtFe–FeOx Nanowires for Room Temperature CO Oxidation

Zhu, Huiyuan; Wu, Zili; Su, Dong; Veith, Gabriel M.; Lu, Hanfeng; Zhang, Pengfei; Chai, Song‐Hai; Dai, Sheng

doi:10.1021/jacs.5b07011

Cited by 91 publications

(61 citation statements)

References 29 publications

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“…It is shown recently [37] that by using iron-containing platinum nanowires deposited on TiO 2 as a catalyst for the reaction of CO oxidation by air, the complete 100 % conversion is achieved already at room temperature. In combination with the results of [38] where 100 % conversion at room temperature for the same reaction has been achieved by using Au nanoparticles on γ-Fe 2 O 3 support as a catalyst, this indicates that for the oxidation of CO by air, the successful catalysis by gold nanoweb can be carried out just at room temperature, when the gold nanowires are quite stable against their decay into a chain of nanoclusters.…”

Section: Resultsmentioning

confidence: 99%

Application of Au–Cu nanowires fabricated by laser ablation in superfluid helium as catalysts for CO oxidation

et al. 2015

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The copper-doped gold nanowires (4 nm in diameter) were produced by the novel technique based of laser ablation of Au-Cu alloy inside superfluid helium. The principle of the method is using the quantized vortices as the 1D template for the condensation of the ablation products into thin threads. The nanowires were applied as the catalyst in СО oxidation with oxygen. The activity of Au-Cu nanowires deposited on glass filters was compared with that for monometallic and bimetallic Au and Cu particles (3-8 nm in diameter) deposited on alumina by traditional deposition-precipitation and impregnation techniques. The apparent activation energies of the reaction (Еа) were 95 and 98, 150, and 147 kJ/ mol for Au-Cu nanowires and Au-Cu, Au, and Cu particles, respectively. During running-in of the Au-Cu nanowirebased catalyst, Еа decreased to 20 kJ/mol and retained at this level in the subsequent cycles of lowering and raising the reactor temperature.

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Section: Resultsmentioning

confidence: 99%

Application of Au–Cu nanowires fabricated by laser ablation in superfluid helium as catalysts for CO oxidation

et al. 2015

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“…Taking CO oxidation as an example—on a Pt surface, owing to the strong binding of CO, the O 2 activation is usually blocked; therefore a redox-active support (TiO 2 (ref. 29), CeO 2 (refs 30, 31), FeO x (ref. 32)) that can transfer its lattice oxygen to the Pt catalyst's surface is a prerequisite for efficient CO oxidation.…”

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confidence: 99%

Taming interfacial electronic properties of platinum nanoparticles on vacancy-abundant boron nitride nanosheets for enhanced catalysis

et al. 2017

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Taming interfacial electronic effects on Pt nanoparticles modulated by their concomitants has emerged as an intriguing approach to optimize Pt catalytic performance. Here, we report Pt nanoparticles assembled on vacancy-abundant hexagonal boron nitride nanosheets and their use as a model catalyst to embrace an interfacial electronic effect on Pt induced by the nanosheets with N-vacancies and B-vacancies for superior CO oxidation catalysis. Experimental results indicate that strong interaction exists between Pt and the vacancies. Bader charge analysis shows that with Pt on B-vacancies, the nanosheets serve as a Lewis acid to accept electrons from Pt, and on the contrary, when Pt sits on N-vacancies, the nanosheets act as a Lewis base for donating electrons to Pt. The overall-electronic effect demonstrates an electron-rich feature of Pt after assembling on hexagonal boron nitride nanosheets. Such an interfacial electronic effect makes Pt favour the adsorption of O2, alleviating CO poisoning and promoting the catalysis.

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“…In Figure 2a,the evident Fourier-transform infrared (FTIR) absorptions (1460, 1646, 2854, and 2923 cm À1 )o bserved on Au/TiO 2 were caused by the ligands bound on the Au NPs.A fter being subjected to 500 8 8Cannealing in an N 2 flow,these absorptions disappeared completely.W hat happened to the surfactants during this procedure:W ere they completely removed by annealing treatment, or still there but just thermally transformed to carbonaceous coatings?T obetter study this question, further characterizations such as optical properties,Raman spectroscopy,T EM imaging,a nd in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) were performed. [12,17] In Figure 2b,the sample color of Au/TiO 2 has turned dark after annealing in an N 2 flow,visually demonstrating that the surfactants were carbonized at an elevated temperature. Correspondingly,t wo evident Raman peaks (1580 and 1355 cm À1 )a ssigned to the characteristic G-and D-bands of the carbon species were observed on Au/TiO 2 -500-N 2 (Figure 2c).…”

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confidence: 99%

Surfactant‐Assisted Stabilization of Au Colloids on Solids for Heterogeneous Catalysis

et al. 2017

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The stabilization of surfactant-assisted synthesized colloidal noble metal nanoparticles (NPs, such as Au NPs) on solids is a promising strategy for preparing supported nanocatalysts for heterogeneous catalysis because of their uniform particle sizes, controllable shapes, and tunable compositions. However, surfactant removal to obtain clean surfaces for catalysis through traditional approaches (such as solvent extraction and thermal decomposition) can easily induce the sintering of NPs, greatly hampering their use in synthesis of novel catalysts. Such unwanted surfactants have now been utilized to stabilize NPs on solids by a simple yet efficient thermal annealing strategy. After being annealed in N flow, the surface-bound surfactants are carbonized in situ as sacrificial architectures that form a conformal coating on NPs and assist in creating an enhanced metal-support interaction between NPs and substrate, thus slowing down the Ostwald ripening process during post-oxidative calcination to remove surface covers.

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Constructing Hierarchical Interfaces: TiO₂-Supported PtFe–FeO_x Nanowires for Room Temperature CO Oxidation

Cited by 91 publications

References 29 publications

Application of Au–Cu nanowires fabricated by laser ablation in superfluid helium as catalysts for CO oxidation

Application of Au–Cu nanowires fabricated by laser ablation in superfluid helium as catalysts for CO oxidation

Taming interfacial electronic properties of platinum nanoparticles on vacancy-abundant boron nitride nanosheets for enhanced catalysis

Surfactant‐Assisted Stabilization of Au Colloids on Solids for Heterogeneous Catalysis

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