Co3O4 nanoparticles characterized by XPS and UPS

Cole, Kevin M.; Kirk, Donald W.; Thorpe, Steven J.

doi:10.1116/6.0000477

Cited by 45 publications

(25 citation statements)

References 14 publications

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“…[29] In addition, two sets of sharp peaks located at 779.2/794.3 eV and 780.7/796.3 eV, respectively, belong to Co 2p in Co 3 O 4 NFs (Figure 3d). [30] Their shift to larger binding energy in the Mo-Co 3 O 4 NFs manifests the likely electron transfer from Mo to adjacent Co, [11] matching well with Mo 3d XPS results. In Co 2p of Co 3 O 4 -Mo 2 N NFs, it is noted that the shift of binding energy to a higher value becomes more obvious, suggesting more extra charges at the Co side.…”

Section: Resultssupporting

confidence: 72%

Nanoframes of Co₃O₄–Mo₂N Heterointerfaces Enable High‐Performance Bifunctionality toward Both Electrocatalytic HER and OER

Wang

Zang

et al. 2021

Adv Funct Materials

201

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Interfacial engineering of heterostructured catalysts has attracted great interest in enabling both hydrogen and oxygen evolution reactions (HER and OER), by fine tuning of the interfacial geometry and electronic structures. However, they are not well structured for high-performing bifunctionalities, largely due to the confined single particle morphologies, where the exposed surfaces and interfaces are limited. Herein, a hollow nanoframing strategy is purposely devised for interconnected Co 3 O 4 -Mo 2 N heterostructures that are designed with interfacial charge transfer from Mo 2 N to Co 3 O 4 , as rationalized by theoretical calculations and confirmed by X-ray photoelectron spectroscopy analyses. It is shown that by the controllable pyrolysis of bimetallic Mo-Co Prussian blue analogue nanoframes (NFs) with an optimal Mo/Co ratio, the desired nanoframes of Co 3 O 4 -Mo 2 N heterostructure are successfully formed. The as-synthesized Co 3 O 4 -Mo 2 N NFs not only inherit the functionalities of individual components and the electrolyte-accessible nanoframe structure, and they also give an ideal heterointerface with strong electron interaction and favorable H 2 O/H* adsorption energies, leading to a remarkable enhancement in bifunctional catalytic activities (i.e., 12.9-fold and 20-fold higher current density under the 300 mV overpotential, as compared to the single-phased Co 3 O 4 NFs alone toward HER and OER, respectively), while remaining a robust stability.

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Section: Resultssupporting

confidence: 72%

Nanoframes of Co₃O₄–Mo₂N Heterointerfaces Enable High‐Performance Bifunctionality toward Both Electrocatalytic HER and OER

Wang

Zang

et al. 2021

Adv Funct Materials

201

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“…The main signal due to lattice oxygen (O 2-) is observed at 529.4 eV that is in agreement with the previous report[40]. Besides, shoulder signals at a higher binding energy of 530.9 eV and 532.3 eV come from surface hydroxyl groups and chemisorbed oxygen[41].…”

supporting

confidence: 92%

Using ZnCo2O4 Nanoparticles as the Hole Transport Layer to Improve Long-Term Stability of Perovskite Solar Cells

Jheng

Chiu

Yang

et al. 2021

Preprint

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Inorganic metal oxides with the merits of high carrier transport capability, low cost and superior chemical stability have largely served as the hole transport layer (HTL) in perovskite solar cells (PSCs) in recent years. Among them, ternary metal oxides gradually attract attention because of the wide tenability of the two inequivalent cations in the lattice sites that offer interesting physicochemical perperties. In this work, ZnCo2O4 nanoparticles (NPs) were prepared by a chemical precipitation method and served as the HTL in inverted PSCs. The device based on the ZnCo2O4 NPs HTL showed better efficiency of 12.31% and negligible hysteresis compared with the one using PEDOT:PSS film as the HTL. Moreover, the device sustained 85% of its initial efficiency after 240 hours storage under a halogen lamps matrix exposure with an illumination intensity of 1000 W/m2, providing a powerful strategy to design long-term stable PSCs for future production.

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“…Finally, the signals located at 785.5 and 789.5 eV were identified as the shake-up satellite signals from the Co 2+ and Co 3+ ions, respectively [26]. On the other hand, the O1s spectra of the samples was deconvoluted into four signals located at 529.5, 530.6, 531.5 and 532.6 eV, which were identified as lattice oxygen species, adsorbed oxygen species, oxygen from carbonate and hydroxyl groups and oxygen from adsorbed water, respectively [27,28].…”

Section: Physico-chemical Characterisation Of the Catalystsmentioning

confidence: 99%

“…lattice oxygen species, adsorbed oxygen species, oxygen from carbonate and hydroxyl groups and oxygen from adsorbed water, respectively [27,28]. The surface composition in terms of Co 3+ /Co 2+ and Oads/Olatt molar ratios estimated from the aforementioned deconvolutions is summarized in Table 2.…”

Section: Physico-chemical Characterisation Of the Catalystsmentioning

confidence: 99%

Bulk Co3O4 for Methane Oxidation: Effect of the Synthesis Route on Physico-Chemical Properties and Catalytic Performance

et al. 2022

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The synthesis of bulk pure Co3O4 catalysts by different routes has been examined in order to obtain highly active catalysts for lean methane combustion. Thus, eight synthesis methodologies, which were selected based on their relatively low complexity and easiness for scale-up, were evaluated. The investigated procedures were direct calcination of two different cobalt precursors (cobalt nitrate and cobalt hydroxycarbonate), basic grinding route, two basic precipitation routes with ammonium carbonate and sodium carbonate, precipitation-oxidation, solution combustion synthesis and sol-gel complexation. A commercial Co3O4 was also used as a reference. Among the several examined methodologies, direct calcination of cobalt hydroxycarbonate (HC sample), basic grinding (GB sample) and basic precipitation employing sodium carbonate as the precipitating agent (CC sample) produced bulk catalysts with fairly good textural and structural properties, and remarkable redox properties, which were found to be crucial for their good performance in the oxidation of methane. All catalysts attained full conversion and 100% selectivity towards CO2 formation at a temperature of 600 °C while operating at 60,000 h−1. Among these, the CC catalyst was the only one that achieved a specific reaction rate higher than that of the reference commercial Co3O4 catalyst.

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Co3O4 nanoparticles characterized by XPS and UPS

Cited by 45 publications

References 14 publications

Nanoframes of Co₃O₄–Mo₂N Heterointerfaces Enable High‐Performance Bifunctionality toward Both Electrocatalytic HER and OER

Nanoframes of Co₃O₄–Mo₂N Heterointerfaces Enable High‐Performance Bifunctionality toward Both Electrocatalytic HER and OER

Using ZnCo2O4 Nanoparticles as the Hole Transport Layer to Improve Long-Term Stability of Perovskite Solar Cells

Bulk Co3O4 for Methane Oxidation: Effect of the Synthesis Route on Physico-Chemical Properties and Catalytic Performance

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Co3O4 nanoparticles characterized by XPS and UPS

Cited by 45 publications

References 14 publications

Nanoframes of Co3O4–Mo2N Heterointerfaces Enable High‐Performance Bifunctionality toward Both Electrocatalytic HER and OER

Nanoframes of Co3O4–Mo2N Heterointerfaces Enable High‐Performance Bifunctionality toward Both Electrocatalytic HER and OER

Using ZnCo2O4 Nanoparticles as the Hole Transport Layer to Improve Long-Term Stability of Perovskite Solar Cells

Bulk Co3O4 for Methane Oxidation: Effect of the Synthesis Route on Physico-Chemical Properties and Catalytic Performance

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Nanoframes of Co₃O₄–Mo₂N Heterointerfaces Enable High‐Performance Bifunctionality toward Both Electrocatalytic HER and OER

Nanoframes of Co₃O₄–Mo₂N Heterointerfaces Enable High‐Performance Bifunctionality toward Both Electrocatalytic HER and OER