MoO<sub>3−x</sub>-deposited TiO<sub>2</sub> nanotubes for stable and high-capacitance supercapacitor electrodes

Sun, Shupei; Sun, Yiwen; Jiang, Wen; Zhang, Bo; Liao, Xiaoming; Yin, Guangfu; Huang, Zhongbing; Pu, Ximing

doi:10.1039/c8ra02744g

Cited by 25 publications

(5 citation statements)

References 53 publications

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“…The MoO 3 /TiO 2 material is of interest in chemical sensors, photonics, and energy storage. , It is also a precursor of hydrodesulfuration (HDS) catalysts used to remove sulfur from petroleum refined products, , as well as a heterogeneous catalyst widely used for the oxidation of hydrocarbons and alcohols and the etherification of alcohols in the presence of water. , The catalytic activity of MoO 3 /TiO 2 is notably related to its Brønsted acidity due to the presence of surface OH groups . However, the local environment of these OH functionalities remains elusive.…”

Section: Introductionmentioning

confidence: 99%

Observation of Low-γ Quadrupolar Nuclei by Surface-Enhanced NMR Spectroscopy

et al. 2020

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We introduce a novel NMR approach that extends the capabilities of indirect dynamic nuclear polarization (DNP) under magic-angle spinning to probe the local environment of half-integer spin quadrupolar nuclei. Compared to cross-polarization, this novel method based on the refocused INEPT scheme with adiabatic dipolar recoupling is easier to optimize and does not distort the quadrupolar line shapes. Furthermore, the use of this technique, instead of the PRESTO (Phase-shifted Recoupling Effects a Smooth Transfer of Order) scheme or direct DNP, greatly improves the sensitivity of DNP-NMR for the detection of quadrupolar isotopes with small dipolar couplings to protons, including notably those located in the subsurface of inorganic materials or with low gyromagnetic ratio (γ). This technique has been applied to identify the atomic-level structure of Brønsted acid sites of hydrated titania-supported MoO3, MoO3/TiO2, a widely used heterogeneous catalyst. The spectra of protonated and unprotonated 17O sites, acquired in natural abundance, indicate the presence of various oxomolybdate species as well as HOMo2 and HOMo3 Brønsted acid sites. The enhanced sensitivity of this new method has also enabled the acquisition of the first DNP-enhanced spectra of 95Mo and 47,49Ti low-γ quadrupolar isotopes. This possibility has been demonstrated by detecting the signals of these nuclei near the surface of MoO3/TiO2. This technique has allowed the observation of 49Ti surface sites, which are absent from the bulk region of TiO2. Furthermore, both 95Mo and 47,49Ti DNP spectra have shown an increased structural disorder of TiO2 and MoO3 phases near the surface of the particles and notably the preferential location of the amorphous TiO2 phase at the surface of the particles. The proposed polarization transfer is also employed to acquire the first DNP-enhanced spectrum of 67Zn, another low-γ quadrupolar isotope. This possibility is demonstrated for Al-doped ZnO nanoparticles used in optoelectronic devices. The obtained 17O, 27Al, and 67Zn DNP-NMR data prove that the surface region of these nanoparticles contains ZnO phase as well as secondary phases, such as α-Al2O3 and partially inverse ZnAl2O4 spinel.

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Section: Introductionmentioning

confidence: 99%

Observation of Low-γ Quadrupolar Nuclei by Surface-Enhanced NMR Spectroscopy

et al. 2020

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“…Supercapacitors (SCs) make their appearance as one of the most promising energy storage devices due to their high power density, excellent stability, being lightweight, and ease of handling. There are plenty of pseudocapacitive behavior based electrode materials such as RuO 2 , − MnO 2 , , MoO 3 , − etc. that have been extensively studied.…”

Section: Introductionmentioning

confidence: 99%

Robust, Flexible, and Binder Free Highly Crystalline V₂O₅ Thin Film Electrodes and Their Superior Supercapacitor Performances

Ramachandran

Jayaraman

Ragupathy

et al. 2019

ACS Sustainable Chem. Eng.

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Modern wearable technologies require highly efficient energy storage devices for improving their performance attributing a controlled shape and flexibility. Here, the present study is focused on the fabrication of a highly improved V2O5 thin film based supercapacitor. Symmetric device of V2O5||PVA-KOH||V2O5 was fabricated using thin flexible electrodes prepared by a thermal evaporation technique. The symmetric supercapacitor devices were fabricated using both annealed and as-prepared films separately, and their performance characteristics were compared. The V2O5 symmetric device having pseudocapacitive behavior delivered a maximum specific areal capacitance of 9.7 mF cm–2 at a scan rate of 10 mV s–1. The symmetric microcapacitor also showed promising performance even after being bent at 60 and 120°. This indicates the reliability of the fabricated devices for flexible electronic applications. Moreover, the symmetric capacitor showed excellent capacitance retention (95%) even after 30 000 cycles with the coulombic efficiency of 99%. Furthermore, practical feasibility of the as fabricated devices was demonstrated by lighting blue light-emitting diodes by connecting them in series. On the other hand, characteristics of the V2O5 thin films were also studied using X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, field emission scanning electron microscopy, and atomic force microscopy analysis.

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“…Based on the results of studying the morphology of the coating ( Figure 2 , Figure 3 , Figure 4 and Figure 5 ) of samples S1–S5 and the dependence of the phase angle on frequency ( Figure 9 c), it was established that the coating has a two-layer structure. To describe the obtained spectra, a double chain of components R-CPE was used ( Figure 10 ), where the element R 2 -CPE 2 [ 41 ] characterizes the barrier non-porous layer of the coating (low-frequency region, Figure 9 c), and R 1 -CPE 1 characterizes the outer nanotubular layer (mid-frequency region, Figure 9 c). The electrolyte resistance was designated R s and was 37 ± 2 Ohms.…”

Section: Resultsmentioning

confidence: 99%

Surface Properties of Ti65Zr Alloy Modified with TiZr Oxide and Hydroxyapatite

Nahum,

Lugovskoy,

Lugovskoy

et al. 2023

Nanomaterials

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Titanium-zirconium dioxide nanostructures loaded by hydroxyapatite were produced on the surface of Ti65Zr alloy. The alloy was treated by anodization with the subsequent immersion in calcium glycerophosphate (CG) solutions. The resulting surfaces present TiO2-ZrO2 nanotubular (TiZr-NT) structures enriched with hydroxyapatite (HAP). The nanotube texture is expected to enhance the surface’s corrosion resistance and promote integration with bone tissue in dental implants. The TiZr-NT structure had a diameter of 73 ± 2.2 nm and a length of 10.1 ± 0.5 μm. The most favorable result for the growth of HAP in Hanks’ balanced salt solution (Hanks’ BSS) was obtained at a CG concentration of 0.5 g/L. Samples soaked in CG at a concentration of 0.5 g/L demonstrated in a decrease of the contact angles to 25.2°; after 3 days of exposure to Hanks’ BSS, the contact angles further reduced to 18.5°. The corrosion studies also showed that the TiZr-NT structure soaked in the CG = 0.5 g/L solution exhibited the best corrosion stability.

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MoO_3−x-deposited TiO₂ nanotubes for stable and high-capacitance supercapacitor electrodes

Abstract: Here we report the supercapacitive properties of a novel MoO3−x/TiO2 nanotube composite prepared by a facile galvanostatic deposition technique and subsequently thermal treatment in an argon atmosphere between 350 °C and 550 °C.

Cited by 25 publications

References 53 publications

Observation of Low-γ Quadrupolar Nuclei by Surface-Enhanced NMR Spectroscopy

Observation of Low-γ Quadrupolar Nuclei by Surface-Enhanced NMR Spectroscopy

Robust, Flexible, and Binder Free Highly Crystalline V₂O₅ Thin Film Electrodes and Their Superior Supercapacitor Performances

Surface Properties of Ti65Zr Alloy Modified with TiZr Oxide and Hydroxyapatite

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MoO3−x-deposited TiO2 nanotubes for stable and high-capacitance supercapacitor electrodes

Abstract: Here we report the supercapacitive properties of a novel MoO3−x/TiO2 nanotube composite prepared by a facile galvanostatic deposition technique and subsequently thermal treatment in an argon atmosphere between 350 °C and 550 °C.

Cited by 25 publications

References 53 publications

Observation of Low-γ Quadrupolar Nuclei by Surface-Enhanced NMR Spectroscopy

Observation of Low-γ Quadrupolar Nuclei by Surface-Enhanced NMR Spectroscopy

Robust, Flexible, and Binder Free Highly Crystalline V2O5 Thin Film Electrodes and Their Superior Supercapacitor Performances

Surface Properties of Ti65Zr Alloy Modified with TiZr Oxide and Hydroxyapatite

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Product

Resources

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MoO_3−x-deposited TiO₂ nanotubes for stable and high-capacitance supercapacitor electrodes

Robust, Flexible, and Binder Free Highly Crystalline V₂O₅ Thin Film Electrodes and Their Superior Supercapacitor Performances