Sol-gel preparation and characterization of Er3+ doped TiO2 luminescent nanoparticles

Talane, T.E.; Mbule, Pontsho; Noto, L.L.; Shingange, Katekani; Mhlongo, G.H.; Mothudi, B.M.; Dhlamini, M.S.

doi:10.1016/j.materresbull.2018.09.007

Cited by 27 publications

(16 citation statements)

References 52 publications

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“…Photoluminescence (PL) spectroscopy was carried out at RT using 220 nm excitation wavelength to further confirm the successful fabrication of O V s (Figure S3). Compared with MXene, O V ‐TiO 2 /MXene exhibited an exponentially lower emission intensity because O V s in O V ‐TiO 2 /MXene lowered recombination rate of the photogenerated holes with the single‐electron‐trapped O V s [44–46] . All above results confirmed the co‐existence of Ti 3 C 2 T x MXene and defectively anatase TiO 2 in the as‐treated samples.…”

Section: Resultssupporting

confidence: 58%

Promoting the Electrocatalytic Activity of Ti₃C₂T_x MXene by Modulating CO₂ Adsorption through Oxygen Vacancies for High‐Performance Lithium‐Carbon Dioxide Batteries

et al. 2020

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Lithium‐carbon dioxide (Li‐CO2) batteries are considered as a most auspicious energy storage systems owing to their high capacity and the ability of capturing CO2. However, there are still some critical issues needed to be addressed before their practical application, such as high charge potential and poor cyclability. Herein, oxygen vacancy‐enriched TiO2 nanoparticles grown in situ on Ti3C2Tx MXene (OV‐TiO2/MXene) are synthesized as catalysts for Li‐CO2 batteries by facile one‐step ethanol heat treatment of the MXene nanosheets. The thermodynamically metastable Ti atom on the surface of MXenes serves as nucleating sites, which play a critical role in generating the relatively stable vacancy‐rich TiO2 nanoparticles. The spontaneously generated oxygen vacancies can enhance CO2 adsorption, which is beneficial to CO2 involved electrode reactions. The Li‐CO2 batteries with OV‐TiO2/MXene electrodes deliver noteworthily reduced charge voltage of 3.37 V at 100 mA g−1, and a superb cycling performance of 158 cycles. This work highlights the significant role of oxygen vacancies in activating CO2 in Li‐CO2 batteries, instrumental to the development of high‐performance electrocatalysts for Li‐CO2 batteries and beyond.

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Section: Resultssupporting

confidence: 58%

Promoting the Electrocatalytic Activity of Ti₃C₂T_x MXene by Modulating CO₂ Adsorption through Oxygen Vacancies for High‐Performance Lithium‐Carbon Dioxide Batteries

et al. 2020

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“…This was because most of the photoexcited electrons could be trapped in those V o , resulting in nonradiative centers and subsequently the decreased emission intensity. Accordingly, the PL test again confirmed the abundant V o presenting in the TiO 2 /Ti 3 C 2 T x (Figure S1, Supporting Information). As shown in Figure S2 in the Supporting Information, the binding energies at 530.78, 532.03, and 533.49 eV in the XPS spectrum of O 1s correspond to the lattice oxygen (O L ), V o , and chemisorbed oxygen (O C ), respectively .…”

mentioning

confidence: 53%

“…. Accordingly, the PL test again confirmed the abundant V o presenting in the TiO 2 /Ti 3 C 2 T x [53,54] ( Figure S1, Supporting Information). [31] Meanwhile, the treated sample exhibited a new emerging peak at 154 cm −1 ( Figure 1C), indicating the formation of the anatase.…”

mentioning

confidence: 54%

High‐Performance Electrocatalytic Conversion of N₂ to NH₃ Using Oxygen‐Vacancy‐Rich TiO₂ In Situ Grown on Ti₃C₂T_x MXene

Fang

Liu

Han

et al. 2019

Advanced Energy Materials

365

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To achieve the energy‐effective ammonia (NH3) production via the ambient‐condition electrochemical N2 reduction reaction (NRR), it is vital to ingeniously design an efficient electrocatalyst assembling the features of abundant surface deficiency, good dispersibility, high conductivity, and large surface specific area (SSA) via a simple way. Inspired by the fact that the MXene contains thermodynamically metastable marginal transition metal atoms, the oxygen‐vacancy‐rich TiO2 nanoparticles (NPs) in situ grown on the Ti3C2Tx nanosheets (TiO2/Ti3C2Tx) are prepared via a one‐step ethanol‐thermal treatment of the Ti3C2Tx MXene. The oxygen vacancies act as the main active sites for the NH3 synthesis. The highly conductive interior untreated Ti3C2Tx nanosheets could not only facilitate the electron transport but also avoid the self‐aggregation of the TiO2 NPs. Meanwhile, the TiO2 NPs generation could enhance the SSA of the Ti3C2Tx in return. Accordingly, the as‐prepared electrocatalyst exhibits an NH3 yield of 32.17 µg h−1 mg−1cat. at −0.55 V versus reversible hydrogen electrode (RHE) and a remarkable Faradaic efficiency of 16.07% at −0.45 V versus RHE in 0.1 m HCl, placing it as one of the most promising NRR electrocatalysts. Moreover, the density functional theory calculations confirm the lowest NRR energy barrier (0.40 eV) of TiO2 (101)/Ti3C2Tx compared with Ti3C2Tx or TiO2 (101) alone.

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“…(b), TiO 2 –Yb 0.15 Er 0.15 Ce 0.14 sample exhibited low emission intensity because of the existence of oxygen vacancy in TiO 2 . The combination of high charge separation and low electron–hole recombination rate could result in high reaction chance of photogenerated charge carriers …”

Section: Resultsmentioning

confidence: 99%

“…For example, new absorption peaks appeared in the range 453–654 nm by doping erbium ion (Er 3+ ) into TiO 2 . The appearance of these peaks resulted from the intermediate energy levels in the band gap of the TiO 2 host to make them visible light absorbable . Cerium (Ce) doping brings in the special catalytic and optical properties because its electronic structure consists of Ce 3+ with 4f 1 5d 0 and Ce 4+ with 4f 0 5d 0 .…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic activity of Yb, Er, Ce‐codoped TiO₂ for degradation of Rhodamine B and 4‐chlorophenol

Paeng

Phượng

Dao

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Photodegradation through an advanced oxidation process gives promising prospects for environmental protection. Although titanium dioxide (TiO2) is considered as an excellent photonic material candidate, however, the band gap of TiO2 is 3.2 eV which limits its effective applications. Various approaches have been developed for enhancing the utilization of TiO2 such as coupling with other narrow bandgap semiconductors and metal ions. We developed a novel ytterbium (Yb), erbium (Er), cerium (Ce)‐codoped TiO2 material as a high‐performance photocatalyst for efficient degradation of Rhodamine B (RhB) and 4‐chlorophenol (4‐CP) by hydrothermal technique. Yb, Er, and Ce ions served as electron collectors for the interfacial electrons transferred from TiO2, thus enhancing the separation of the photo‐induced electron–hole pairs. RESULTS The photocatalytic activity of the prepared TiO2–Er0.15Yb0.15Ce0.14 sample is higher than those of undoped TiO2, TiO2–Ce0.3 and TiO2–Er0.15Yb0.15 samples under optimal condition. Our developed catalyst degraded 98% of 0.04 mM RhB and 95% of 0.6 mM 4‐CP under white light irradiation for 60 and 240 min, respectively. Moreover, a probable photodegradation mechanism is proposed. CONCLUSION TiO2–Er0.15Yb0.15Ce0.14 with high photocatalytic degradation efficiency under white light irradiation was synthesized by a hydrothermal method. Yb3+, Er3+, Ce4+ played a role as photo‐induced electron collectors to suppress the recombination of photo‐induced electron–hole pairs. The synthesized material has a high potential as an efficient photocatalyst for toxic pollutants in aqueous media. © 2019 Society of Chemical Industry

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Sol-gel preparation and characterization of Er3+ doped TiO2 luminescent nanoparticles

Cited by 27 publications

References 52 publications

Promoting the Electrocatalytic Activity of Ti₃C₂T_x MXene by Modulating CO₂ Adsorption through Oxygen Vacancies for High‐Performance Lithium‐Carbon Dioxide Batteries

Promoting the Electrocatalytic Activity of Ti₃C₂T_x MXene by Modulating CO₂ Adsorption through Oxygen Vacancies for High‐Performance Lithium‐Carbon Dioxide Batteries

High‐Performance Electrocatalytic Conversion of N₂ to NH₃ Using Oxygen‐Vacancy‐Rich TiO₂ In Situ Grown on Ti₃C₂T_x MXene

Photocatalytic activity of Yb, Er, Ce‐codoped TiO₂ for degradation of Rhodamine B and 4‐chlorophenol

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Sol-gel preparation and characterization of Er3+ doped TiO2 luminescent nanoparticles

Cited by 27 publications

References 52 publications

Promoting the Electrocatalytic Activity of Ti3C2Tx MXene by Modulating CO2 Adsorption through Oxygen Vacancies for High‐Performance Lithium‐Carbon Dioxide Batteries

Promoting the Electrocatalytic Activity of Ti3C2Tx MXene by Modulating CO2 Adsorption through Oxygen Vacancies for High‐Performance Lithium‐Carbon Dioxide Batteries

High‐Performance Electrocatalytic Conversion of N2 to NH3 Using Oxygen‐Vacancy‐Rich TiO2 In Situ Grown on Ti3C2Tx MXene

Photocatalytic activity of Yb, Er, Ce‐codoped TiO2 for degradation of Rhodamine B and 4‐chlorophenol

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Promoting the Electrocatalytic Activity of Ti₃C₂T_x MXene by Modulating CO₂ Adsorption through Oxygen Vacancies for High‐Performance Lithium‐Carbon Dioxide Batteries

Promoting the Electrocatalytic Activity of Ti₃C₂T_x MXene by Modulating CO₂ Adsorption through Oxygen Vacancies for High‐Performance Lithium‐Carbon Dioxide Batteries

High‐Performance Electrocatalytic Conversion of N₂ to NH₃ Using Oxygen‐Vacancy‐Rich TiO₂ In Situ Grown on Ti₃C₂T_x MXene

Photocatalytic activity of Yb, Er, Ce‐codoped TiO₂ for degradation of Rhodamine B and 4‐chlorophenol