The effect of oxygen vacancies in ZnO at an Au/ZnO interface on its catalytic selective oxidation of glycerol

Wu, Guandong; Zhao, Gengqiang; Sun, Jianhua; Cao, Xingzhong; He, Yufei; Feng, Junting; Li, Dianqing

doi:10.1016/j.jcat.2019.06.030

Cited by 73 publications

(43 citation statements)

References 63 publications

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“…32 The oxygen vacancy region of PdO x /NiO NFs accounts for a higher proportion (59.54%) of the O 1s peak compared to that (56.80%) of Pd/NiO NFs, meaning that the in situ introduction of Pd can generate more oxygen vacancies due to the metal−support interfacial interaction. 33 Moreover, the O 1s peaks of PdO x /NiO NFs shift toward the higher binding energies, compared to the corresponding ones of Pd/NiO NFs, meaning that the electron transfer from NiO to PdO x readily occurs in PdO x /NiO NFs. The Pd 3d spectrum of Pd/NiO NFs can be deconvoluted into four peaks (Figure 3d).…”

Section: ■ Results and Discussionmentioning

confidence: 68%

“…O 1s spectra of both PdO x /NiO NFs and Pd/NiO NFs consist of two obvious peaks, where the sharp peak at ∼529 eV is the characteristic peak of lattice oxygen in metal oxides, while the broad peak centered at ∼531 eV is related to O 2– in the oxygen vacancy regions . The oxygen vacancy region of PdO x /NiO NFs accounts for a higher proportion (59.54%) of the O 1s peak compared to that (56.80%) of Pd/NiO NFs, meaning that the in situ introduction of Pd can generate more oxygen vacancies due to the metal–support interfacial interaction . Moreover, the O 1s peaks of PdO x /NiO NFs shift toward the higher binding energies, compared to the corresponding ones of Pd/NiO NFs, meaning that the electron transfer from NiO to PdO x readily occurs in PdO x /NiO NFs.…”

Section: Resultsmentioning

confidence: 98%

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High Activity and Stability of PdO_x Anchored in Porous NiO Nanofibers for Catalyzing Suzuki Coupling Reactions

Wang

Tao

et al. 2020

J. Phys. Chem. C

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Heterogeneous Pd-based catalysts are receiving great attention in cross-coupling reactions due to their distinct advantages of relatively low cost, high stability, easy separation, and recycling. Nonetheless, great challenges still remain in developing heterogeneous catalysts with excellent performance and revealing the origin for efficient catalysis. Herein, we have synthesized a PdO x /NiO NFs catalyst consisting of porous NiO nanofibers and in situ anchored PdO x species by a facile electrospinning−pyrolysis strategy. The electron transfer from NiO to PdO created during the calcination step results in the formation of Pd δ+ (δ < 2) in the PdO x /NiO NFs, validated by both spectroscopic analyses and computational modeling. The PdO x /NiO NFs catalyst exhibits much higher activity than the commercial 5.0 wt % Pd/C and other as-prepared Pd-based catalysts in Suzuki coupling reactions. The turnover frequency (TOF) values for the conversions of iodo-, bromo-, and chlorobenzenes over the PdO x /NiO NFs catalyst are 6.6−7.3 times those over the commercial 5 wt % Pd/C catalyst. Theoretical calculations demonstrate that the configuration of PdO(101)/NiO(111) surface is more propitious to the adsorption and activation of arylhalide and phenylboronic acid than that of Pd(111)/NiO(111) surface. The compelling performance of PdO x /NiO NFs is mainly attributed to the special surface configuration of PdO x and unique electronic state of Pd δ+ species. These traits can be well retained in a long-term reaction owing to the strong metal−support interaction, ensuring the good durability of the catalyst. This study not only develops a promising heterogeneous catalyst with high performance for green synthesis of fine chemicals but also provides insights into the enhancement of catalytic activity achieved by modulating the active centers.

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Section: ■ Results and Discussionmentioning

confidence: 68%

Section: Resultsmentioning

confidence: 98%

High Activity and Stability of PdO_x Anchored in Porous NiO Nanofibers for Catalyzing Suzuki Coupling Reactions

Wang

Tao

et al. 2020

J. Phys. Chem. C

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“…The peak of C-C is significantly higher than the other peaks, indicating that rGO had been successfully prepared. The O 1s spectrum is shown in Figure 5 c. The three characteristic peaks of 531.59 eV, 532.07 eV, and 530.8 eV respectively correspond to the area of oxygen vacancies (O V ), the surface-adsorbed oxygen components (O C ), and the crystal oxygen substances (O L ) [ 43 , 44 , 45 ]. The characteristic peak area of O C is much higher than those of O V and O L , indicating that the sensitive material has a strong ability to absorb and ionize oxygen, which is conducive to improving the gas sensing performance.…”

Section: Resultsmentioning

confidence: 99%

A Flexible and Wearable Nylon Fiber Sensor Modified by Reduced Graphene Oxide and ZnO Quantum Dots for Wide-Range NO2 Gas Detection at Room Temperature

et al. 2022

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Reduced graphene oxide (rGO) fiber as a carbon-based fiber sensor has aroused widespread interest in the field of gas sensing. However, the low response value and poor flexibility of the rGO fiber sensor severely limit its application in the field of flexible wearable electronics. In this paper, a flexible and wearable nylon fiber sensor modified by rGO and ZnO quantum dots (QDs) is proposed for wide-range NO2 gas detection at room temperature. The response value of the nylon fiber sensor to 100 ppm NO2 gas is as high as 0.4958, and the response time and recovery time are 216.2 s and 667.9 s, respectively. The relationship between the sensor’s response value and the NO2 concentration value is linear in the range of 20–100 ppm, and the fitting coefficient is 0.998. In addition, the test results show that the sensor also has good repeatability, flexibility, and selectivity. Moreover, an early warning module was also designed and is proposed in this paper to realize the over-limit monitoring of NO2 gas, and the flexible sensor was embedded in a mask, demonstrating its great application potential and value in the field of wearable electronics.

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“…The peaks at around 529.8, 531.0, and 532.6 eV can be assigned to lattice oxygen (denoted as O latt ), oxide defect sites or oxygen vacancy (denoted as V O ), and surface carbonate or hydroxyl species, respectively. 44,45 As summarized in Table 2 (entries 1 and 2), the introduction of Ce species in the support obviously causes the loss of O latt concentration but the increase in V O concentration (Figure 8A,B). As reported, the increase in V O could be ascribed to the introduction of Ce, which inhibits the crystal growth of the support (Figure 3D,E).…”

Section: Methodsmentioning

confidence: 99%

Pd Nanoparticles Loaded on CoAlCe Layered Double Oxide Nanosheets for Phenol Hydrogenation

Xue

Liu

et al. 2021

ACS Appl. Nano Mater.

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The catalytic upgrading of phenolic derivatives is vital for the efficient utilization of biomass resources. Herein, we construct a reductive layered double oxide material (CoAlCe-LDO) with the Ce−Co interface and abundant oxygen vacancy (V O ) via heat-treating layered double hydroxide (LDH) precursors. The support spontaneous in situ redox method is employed to prepare the supported catalyst using CoAlCe-LDO as a support and reductant. Interestingly, highly dispersed Pd nanoparticles prefer to distribute at the contact edge of the Ce− Co interface. Pd 2+ is successfully reduced to Pd 0 by the reductive Co/Ce sites. Due to the redox reaction between the support and Pd species, a strong metal−support interaction is introduced. The Pd/CoAlCe-LDO catalyst shows high activity for phenol hydrogenation under mild conditions and a low molar ratio of Pd to phenol. The kinetic study suggests that the highly dispersed Pd sites could preferably activate H 2 molecules, thereby boosting the rapid phenol hydrogenation.

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The effect of oxygen vacancies in ZnO at an Au/ZnO interface on its catalytic selective oxidation of glycerol

Cited by 73 publications

References 63 publications

High Activity and Stability of PdO_x Anchored in Porous NiO Nanofibers for Catalyzing Suzuki Coupling Reactions

High Activity and Stability of PdO_x Anchored in Porous NiO Nanofibers for Catalyzing Suzuki Coupling Reactions

A Flexible and Wearable Nylon Fiber Sensor Modified by Reduced Graphene Oxide and ZnO Quantum Dots for Wide-Range NO2 Gas Detection at Room Temperature

Pd Nanoparticles Loaded on CoAlCe Layered Double Oxide Nanosheets for Phenol Hydrogenation

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The effect of oxygen vacancies in ZnO at an Au/ZnO interface on its catalytic selective oxidation of glycerol

Cited by 73 publications

References 63 publications

High Activity and Stability of PdOx Anchored in Porous NiO Nanofibers for Catalyzing Suzuki Coupling Reactions

High Activity and Stability of PdOx Anchored in Porous NiO Nanofibers for Catalyzing Suzuki Coupling Reactions

A Flexible and Wearable Nylon Fiber Sensor Modified by Reduced Graphene Oxide and ZnO Quantum Dots for Wide-Range NO2 Gas Detection at Room Temperature

Pd Nanoparticles Loaded on CoAlCe Layered Double Oxide Nanosheets for Phenol Hydrogenation

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Product

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High Activity and Stability of PdO_x Anchored in Porous NiO Nanofibers for Catalyzing Suzuki Coupling Reactions

High Activity and Stability of PdO_x Anchored in Porous NiO Nanofibers for Catalyzing Suzuki Coupling Reactions