Controlled hydrothermal synthesis of triangular CeO2 nanosheets and their formation mechanism and optical properties

Gong, Jinfeng; Meng, Fanning; Yang, Xin; Fan, Zhenghua; Li, Huijie

doi:10.1016/j.jallcom.2016.08.030

Cited by 88 publications

(41 citation statements)

References 52 publications

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“…Peaks located at 916.83, 903.80, and 899.29 eV are attributed to Ce 3+ 3d 3/2 final states, indicating that the main valence of cerium in the sample is Ce 3+ (54.9%), regardless of the valences of starting ceria27. Furthermore, two strong peaks at 885.57 and 881.37 eV assigned to Ce 3d 5/2 for Ce 4+ final states indicate a handful of Ce 4+ ions (45.1%) existed in the devices28. Therefore, it can be reasonably concluded that there are sufficient number of defects existing in the device reflecting the concentration of oxygen vacancies.…”

Section: Resultsmentioning

confidence: 93%

Endurance and Cycle-to-cycle Uniformity Improvement in Tri-Layered CeO2/Ti/CeO2 Resistive Switching Devices by Changing Top Electrode Material

Rana

Akbar

Ismail

et al. 2017

Sci Rep

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Resistance switching characteristics of CeO2/Ti/CeO2 tri-layered films sandwiched between Pt bottom electrode and two different top electrodes (Ti and TaN) with different work functions have been investigated. RRAM memory cells composed of TaN/CeO2/Ti/CeO2/Pt reveal better resistive switching performance instead of Ti/CeO2/Ti/CeO2/Pt memory stacks. As compared to the Ti/CeO2 interface, much better ability of TaN/CeO2 interface to store and exchange plays a key role in the RS performance improvement, including lower forming/SET voltages, large memory window (~102) and no significant data degradation during endurance test of >104 switching cycles. The formation of TaON thinner interfacial layer between TaN TE and CeO2 film is found to be accountable for improved resistance switching behavior. Partial charge density of states is analyzed using density functional theory. It is found that the conductive filaments formed in CeO2 based devices is assisted by interstitial Ti dopant. Better stability and reproducibility in cycle-to-cycle (C2C) resistance distribution and Vset/Vreset uniformity were achieved due to the modulation of current conduction mechanism from Ohmic in low field region to Schottky emission in high field region.

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Section: Resultsmentioning

confidence: 93%

Endurance and Cycle-to-cycle Uniformity Improvement in Tri-Layered CeO2/Ti/CeO2 Resistive Switching Devices by Changing Top Electrode Material

Rana

Akbar

Ismail

et al. 2017

Sci Rep

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“…CeCO 3 OH was synthesized in a typical hydrothermal process, 1.4903 g CeCl 3 ⋅7H 2 O was dissolved in 10 mL DI water and 3.1622 g NH 4 HCO 3 was dissolved in 15 mL DI water, respectively. Then, the two solutions were mixed and stirred for 1 h. Then, 10 mL ethylenediamine was dropped into the above solution and stirred for 0.5 h. Finally, the solution was transferred into a 50 ml Teflon‐lined autoclave and heated at 200 °C for 48 h. After cooling down, the white precipitates were washed with DI water and dried at 60 °C for 12 h.…”

Section: Methodsmentioning

confidence: 99%

Enhancement of Visible‐Light Photocatalytic Hydrogen Production by CeCO₃OH in g‐C₃N₄/CeO₂ System

et al. 2019

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Promoting the separation of photo-generated carriers is significantly important to improve the efficiency of photocatalytic hydrogen production. Therefore, we prepared g-C 3 N 4 /CeCO 3 OH/ CeO 2 (CeCeCN) ternary nanocomposite via an easy synthetic way using g-C 3 N 4 and CeO 2 as reactants. A CeCO 3 OH layer was formed and resulted in the novel ternary photocatalyst. The CeCeCN composite shows superior photocatalytic (PC) H 2 generation performance in sunlight excitation. The H 2 evolution rate is about 764 μmol h À 1 g À 1 , which is over 11 times larger than those of g-C 3 N 4 and CeO 2 . Compared with g-C 3 N 4 and CeO 2 , CeCeCN further shows a larger photo-response current density and a lower charge-transfer resistance. The remarkably increased photocatalytic property of CeCeCN is because of the efficient charge migration induced by the formed heterojunction. Our findings demonstrate that building multi-heterostructures can liberate more excited electrons for efficient hydrogen production under sunlight.

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“…In fact, the crystal defect of CeO 2 is greatly related to its crystal structure and morphologies. Various microstructures of CeO 2 have been fabricated for practical applications via different approaches in previous works, including bowknot-like crystallites, nanocubes, X-architecture, nanopolyhedra, square-like nanoparticles, nanosheets, nano-octahedrons, ribbon-like nanofibers, urchin-like hierarchical structures, flower-like microspheres, and well-aligned nanorod arrays [24,25,26,27,28,29,30,31,32,33]. Unfortunately, CeO 2 with indirect band gap energy (3.2 eV) is strictly limited in the photocatalytic system of the UV-light region.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Visible-Light Photocatalytic Activity of Ag QDs Anchored on CeO2 Nanosheets with a Carbon Coating

Zheng

Chen

et al. 2019

Nanomaterials

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Ag quantum dots (QDs) anchored on CeO2 nanosheets with a carbon coating (Ag/CeO2@C) (composites) were prepared via an in situ reduction approach for the photocatalytic degradation of Cr(VI) and tetracycline hydrochloride (TCH) in the visible-light region. The photocatalytic activity of Ag/CeO2@C was greatly affected by carbon content, Ag-doping content, Cr(VI) concentration, pH value, and inorganic ions. Enhanced photocatalytic activity was obtained by Ag/CeO2@C (compared to CeO2 and CeO2@C), of which 3-Ag/CeO2@C-2 with an Ag-doping content of 5.41% presented the best removal efficiency and the most superior stability after five cycles. ·O2− and ·OH radicals were crucial for the photocatalytic capacity of 3-Ag/CeO2@C-2. The combined effect of the surface plasma resonance (SPR) of Ag QDs, an electron trapper of carbon shells, and the redox activity of the Ce(III)/Ce(IV) coupling induced efficient charge transfer and separation, suppressing the recombination of electron–hole pairs.

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Controlled hydrothermal synthesis of triangular CeO2 nanosheets and their formation mechanism and optical properties

Cited by 88 publications

References 52 publications

Endurance and Cycle-to-cycle Uniformity Improvement in Tri-Layered CeO2/Ti/CeO2 Resistive Switching Devices by Changing Top Electrode Material

Endurance and Cycle-to-cycle Uniformity Improvement in Tri-Layered CeO2/Ti/CeO2 Resistive Switching Devices by Changing Top Electrode Material

Enhancement of Visible‐Light Photocatalytic Hydrogen Production by CeCO₃OH in g‐C₃N₄/CeO₂ System

Enhanced Visible-Light Photocatalytic Activity of Ag QDs Anchored on CeO2 Nanosheets with a Carbon Coating

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Controlled hydrothermal synthesis of triangular CeO2 nanosheets and their formation mechanism and optical properties

Cited by 88 publications

References 52 publications

Endurance and Cycle-to-cycle Uniformity Improvement in Tri-Layered CeO2/Ti/CeO2 Resistive Switching Devices by Changing Top Electrode Material

Endurance and Cycle-to-cycle Uniformity Improvement in Tri-Layered CeO2/Ti/CeO2 Resistive Switching Devices by Changing Top Electrode Material

Enhancement of Visible‐Light Photocatalytic Hydrogen Production by CeCO3OH in g‐C3N4/CeO2 System

Enhanced Visible-Light Photocatalytic Activity of Ag QDs Anchored on CeO2 Nanosheets with a Carbon Coating

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Enhancement of Visible‐Light Photocatalytic Hydrogen Production by CeCO₃OH in g‐C₃N₄/CeO₂ System