Photoconductivity studies on amorphous and crystalline TiO2and TiO2:Eu3+thin films synthesized by sol-gel

Francisco-Santiago, P.; García-Macedo, Jorge A.; Valverde-Aguilar, Guadalupe

doi:10.1117/12.929891

Cited by 6 publications

(8 citation statements)

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“…The TiO 2 scaffold, featuring a mixture of rutile and anatase phases, contributed the remainder of the visible peaks. The broad peak at 20°–25° may correspond to a fraction of TiO 2 that is amorphous or poorly crystalline, as previous works have seem similar peaks in amorphous TiO 2 , , or alternatively from the π–π stacking of the porphyrin species …”

Section: Results and Discussionmentioning

confidence: 50%

Electrochemically Triggered Dynamics within a Hybrid Metal–Organic Electrocatalyst

et al. 2020

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A wide array of systems, ranging from enzymes to synthetic catalysts, exert adaptive motifs to maximize their functionality. In a related manner, select metal-organic frameworks (MOFs) and related systems exhibit structural modulations under stimuli such as the infiltration of guest species. Probing their responsive behavior in-situ is a challenging but important step towards understanding their function and subsequently building from there. In this report, we investigate the dynamic behavior of an electrocatalytic Mn-porphyrin containing MOF system (Mn-MOF). We discover, using a combination of electrochemistry and in-situ probes of UV-Vis absorption, resonance Raman and infrared spectroscopy, a restructuration of this system via a reversible cleavage of the porphyrin carboxylate ligands under an applied voltage. We further show, by combining experimental data and DFT calculations, as a proof of concept, the capacity to utilize the Mn-MOF for electrochemical CO2 fixation and to spectroscopically capture the reaction intermediates in its catalytic cycle. The findings of this work and methodology developed opens opportunities in the application of MOFs as dynamic, enzyme-inspired electrocatalytic systems.

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Section: Results and Discussionmentioning

confidence: 50%

Electrochemically Triggered Dynamics within a Hybrid Metal–Organic Electrocatalyst

et al. 2020

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“…The anatase phase is identified by the diffraction peak at 2θ = 25.45, which can be indexed as (101), as shown in Figure 1c. 33 The TNCM600 exhibits a stronger peak, demonstrating better crystallization, corresponding to the anatase phase. However, TNCM500 has a slightly weaker peak, indicating that it corresponds to the mixture of the anatase and amorphous phases, as shown in Figure 1d.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Thus, we can imply that Ti ions affect the crystal structure of pristine NCM. The anatase phase is identified by the diffraction peak at 2θ = 25.45, which can be indexed as (101), as shown in Figure c . The TNCM600 exhibits a stronger peak, demonstrating better crystallization, corresponding to the anatase phase.…”

Section: Resultsmentioning

confidence: 99%

Suppressed Microcracking and F Penetration of Ni-Rich Layered Cathode via the Combined Effects of Titanium Dioxide Doping and Coating

Hwang

Sim

Jin

et al. 2021

ACS Appl. Energy Mater.

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To understand the effect of heat treatment of TiO 2 modification for Ni-rich LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode, the TiO 2 coating layer is formed on the surface of LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode by heat treatment at 500 and 600 °C. The electrochemical results show that TiO 2 -modified LiNi 0.8 Co 0.1 Mn 0.1 O 2 shows higher electrochemical performances compared to pristine sample. Among them, the TiO 2 -modified LiNi 0.8 Co 0.1 Mn 0.1 O 2 heat-treated at 500 °C delivers not only the highest initial discharge capacity of 201.3 mAh g −1 but also the extraordinary rate capability (86.4% at 6.0C). Moreover, TiO 2 -modified LiNi 0.8 Co 0.1 Mn 0.1 O 2 can effectively stabilize the cycling performance at 25 °C (79.4% after 100 cycles at 0.5C). Consequently, the TiO 2 -modified LiNi 0.8 Co 0.1 Mn 0.1 O 2 by heat treatment at 500 °C can significantly improve the electrochemical performances due to facilitating Li-ion migration, working as a protective layer and inhibiting the irreversible phase transition. KEYWORDS: heat treatment, TiO 2 modification, Ni-rich LiNi 0.8 Co 0.1 Mn 0.1 O 2 , rate capability, cycling performance

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“…phase. 21,22 After 10 days of aging, the diffraction peaks of BaTiO3 almost disappear leaving only the characteristic diffraction spectrum of amorphous hydrated titania, which does not reveal any crystal characteristics; it only shows two wide bands, one centred at ~32° 2θ and the other at ~50° 2θ. 23 According to the previous studies, [24][25][26][27] the amorphous phase of peroxo-titanium hydrate with a unknown structure is generated when the spontaneous hydrolysis at room temperature of the peroxo-titanium solution occurs.…”

Section: Resultsmentioning

confidence: 99%

Revealing the Role of the Intermediates during the Synthesis of BaTi₅O₁₁

et al. 2019

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BaTi5O11 has been extensively studied because of their microwave dielectrics properties. Traditionally, it is difficult to achieve this material as single-phase. Here, we report an effective method to obtain BaTi5O11 powder with nanometerscale crystals, by solid-state reaction at moderate temperatures and using as precursors nanostructured particles consisting of BaTiO3 and TiO2. The main advantage is the intimate contact between the BaTiO3 and TiO2 that ensure, when the solid-state reaction takes place, the formation of complex solid compounds from three or more constituents. The formation mechanism of BaTi5O11 has been studied as a function of both the thermal treatment and the time reaction. The reaction was monitored by Raman spectroscopy combined with Confocal microscopy, the aim of this characterization technique is to provide the description of the general strategy and design principles to obtain BaTi5O11 powder. Consequently, this work is a challenging task for the compositional and structural study of complex inorganic nanoparticles.

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Photoconductivity studies on amorphous and crystalline TiO₂and TiO₂:Eu³⁺thin films synthesized by sol-gel

Cited by 6 publications

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Electrochemically Triggered Dynamics within a Hybrid Metal–Organic Electrocatalyst

Electrochemically Triggered Dynamics within a Hybrid Metal–Organic Electrocatalyst

Suppressed Microcracking and F Penetration of Ni-Rich Layered Cathode via the Combined Effects of Titanium Dioxide Doping and Coating

Revealing the Role of the Intermediates during the Synthesis of BaTi₅O₁₁

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Photoconductivity studies on amorphous and crystalline TiO2and TiO2:Eu3+thin films synthesized by sol-gel

Cited by 6 publications

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Electrochemically Triggered Dynamics within a Hybrid Metal–Organic Electrocatalyst

Electrochemically Triggered Dynamics within a Hybrid Metal–Organic Electrocatalyst

Suppressed Microcracking and F Penetration of Ni-Rich Layered Cathode via the Combined Effects of Titanium Dioxide Doping and Coating

Revealing the Role of the Intermediates during the Synthesis of BaTi5O11

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Photoconductivity studies on amorphous and crystalline TiO₂and TiO₂:Eu³⁺thin films synthesized by sol-gel

Revealing the Role of the Intermediates during the Synthesis of BaTi₅O₁₁