CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Boyu Liu,Tengfei Wang,Qing Pang,Jun Yang,Haidong Liu,Hongyu Wang
To improve the energy density of s ingle-crystal LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NMC523) by increasing the charging cut-off voltage presents a big challenge since the material degrades significantly at high voltage (>4.3V). A simple method to enhance the high-voltage electrochemical properties of single-crystal NMC523 was proposed by introducing a mesoporous TiO 2 coating and Ti doping. The specific discharge capacity for the modified NCM523-M-TiO 2 -0.5 sample achieves 182.81 mAh g −1 at a 0.1 C rate within the 3.0–4.5 V range. Furthermore, the capacity retention rate was 80.69 % after 200 cycles at a charge/discharge rate of 1 C, significantly higher than that of bare NCM523, which exhibited values of 181.36 mAh g −1 and 46.40 %. In detail, the mesoporous TiO 2 coating shields the cathode from the electrolyte, enhancing the stability at the interface and promoting the movement of lithium ions. Additionally, Ti doping increases lattice spacing and stabilizes the layered structure. This research will inform the design of high-performance cathode materials for Li-ion batteries.
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Journal of Energy Storage
·
2025
·
IF 9.8
Guanzheng Wang,Xiaoli Zhan,Wenjiang He,Wenshen Tang,Zhentao Yuan,Lu Li,Xiao Wang,Zhaolin Zhan
Titania (TiO 2 ) is widely recognized as an intercalation-type anode material with favorable parameters of low cost, abundant reserves, high safety, and long life. However, electrode kinetics within TiO 2 is limited, resulting in a theoretical capacity below 335 mAh g −1 . Here, CoTiO 3 was fused with anatase (A)/rutile (R) biphasic TiO 2 to construct multi-scale hybrid CoTiO 3 /A/R-TiO 2 –2 hollow microspheres with a TiO 2 content of about 90 % in this work. The average particle size of the CoTiO 3 /A/R-TiO 2 –2 anode was about 1.97 μm, with a high specific surface area of 76.67 m 2 g −1 , a pore volume of 0.16 cm 3 g −1 , and a large pore size of 8.55 nm. When deployed as an anode in a lithium-ion battery, it provided a high reversible specific capacity of 455 mAh g −1 after 500 cycles at 0.5C. After repeated charge/discharge cycles, a solid electrolyte interphase (SEI) film rich in conducting LiF was formed on the surface of the electrode. Therefore, the high capacity of the anode was mainly attributed to the stable multi-scale hybrid CoTiO 3 /A/R-TiO 2 hollow microspheres and the thin, uniform SEI film. This strategy provided a viable solution for the design of long-life, high-capacity conventional oxide semiconductor anodes.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Qian Wang,Hanyu Shi,Sihan Fang,Chengchen Wang,Jiming Zeng,Guobin Yang,Jun Li,Giuseppe Mele,Chen Wang
Photocatalytic technology, as an environmentally friendly and sustainable approach for hydrogen production, demonstrates significant market potential，where bimetallic single-atom catalysts (SACs) demonstrate superior performance compared to monometallic counterparts through heteronuclear synergistic effects, establishing them as a critical research focus in modern catalytic science. In this investigation, TiO₂ nanosheets were employed as catalytic supports, with oxygen vacancy defects being strategically introduced via H₂-Ar atmosphere thermal reduction to immobilize both monometallic Pt and bimetallic Pt-Pd single atoms. The hydrogen evolution rates were quantified as 1956.45 μmol·h⁻¹ ·g cat ⁻¹ for Pt-loaded catalysts and 3522.65 μmol·h⁻¹ ·g cat ⁻¹ for Pt-Pd-loaded systems, corresponding to 72.3-fold and 130.2-fold improvements relative to unmodified TiO₂. This performance enhancement is attributed to optimized charge carrier separation facilitated by oxygen vacancies and the complementary electronic interactions between Pt and Pd atoms in bimetallic configurations, which collectively promote efficient surface reactions and hydrogen generation kinetics. The remarkable advantages of bimetallic systems in photocatalytic hydrogen evolution are demonstrated through these findings, with Density Functional Theory (DFT) revealing that Pd incorporation not only modulates charge density and band structure through its role as a cocatalyst but also actively participates in the hydrogen evolution reaction as catalytic sites. The formation of Ti-Pt-Ti and Ti-Pd-Ti configurations is observed to effectively reduce reaction energy barriers while suppressing competitive adsorption at isolated metal sites, resulting in enhanced catalytic performance. A strategy for designing efficient photocatalysts is established through this work, supported by mechanistic insights into energy barrier reduction and adsorption regulation, which provides critical theoretical foundations with both scientific and practical significance.
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Materials Today Energy
·
2026
·
IF 8.1
Yifan Li,Hongshun Zheng,Tong Zhou,Hao Cui,Haigang Dong,Dongxia Yang,Ke Wang,Weijie Zhan,Boxue Wang,Yun Chen,Jize Li,Yuetong Cao,Zhikun Wang,Yumin Zhang,Jin Zhang,Qingju Liu
TiO 2 has emerged as one of the most extensively studied photocatalysts, because of its great stability and abundant availability. The hydrogen production efficiency of TiO 2 photocatalysts can be significantly enhanced derived from the precursors of titanium-based metal-organic frameworks (MOFs) loaded with single-atom. Although the hydrogen evolution activity of TiO 2 -based photocatalysts under ultraviolet light has been steadily enhanced in recent years, the activity under visible light remains a critical challenge to be addressed. Herein, we report a Zn single atom (Zn SA) loaded TiO 2 -based photocatalyst derived from Ti-BPDC (Ti-MOF). Under irradiation with visible light at 400 nm, the optimized sample exhibits a hydrogen evolution rate (HER) of 9.21 mmol g −1 h −1 with an apparent quantum efficiency (AQE) of 6.82%, with a HER approximately 3 times higher than that of pristine TiO 2 (3.14 mmol g −1 h −1 ), along with great stability. The results demonstrate that loading an appropriate amount of Zn SAs optimizes the band structure of the photocatalyst, activates the adjacent O atoms, and also suppresses the recombination of photogenerated electron-hole pairs, as well as modulates the adsorption-desorption equilibrium of H∗ species, thereby significantly enhancing photocatalytic activity. This work offers a strategy for designing TiO 2 -based photocatalysts with high visible-light activity.
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ChemNanoMat
·
2026
·Vol. 12
·期 1
·e202500720
·
IF 2.6
Xinbing Jiang,Xingyu Jin,Zizhuo Nie,Wenyu Cheng,Yuxi Fei,Bo Peng,Yuhang Liu,Jiuhong Wang,Libo Zhao,Shujiang Ding
Room-temperature ammonia (NH 3 ) detection is crucial for environmental safety and human health. In this study, a ternary PANI@Au-TiO 2 ammonia-sensitive composite was synthesized via in situ polymerization of polyaniline (PANI) with simultaneous reduction of chloroauric acid to form Au nanoparticles, followed by ultrasonic compounding with TiO 2 nanoparticles. The structural and morphological characterization confirmed the uniform distribution of Au and TiO 2 nanoparticles in the PANI matrix. Gas sensing experiments demonstrated that the PANI@Au-TiO 2 sensor exhibited markedly enhanced NH 3 response, achieving a high sensitivity of 0.0527/ppm compared to PANI, PANI@Au, and PANI-TiO 2 counterparts. Moreover, the PANI@Au-TiO 2 ternary composite sensor displayed excellent linearity within the NH 3 concentration range of 3–30 ppm, along with a low detection limit, good repeatability, and high selectivity toward ammonia. The enhanced performance is attributed to the synergistic effects of the p–n heterojunction, Schottky junction, and catalytic activity of Au nanoparticles, which facilitate efficient charge transfer and amplify the interaction with NH 3 molecules. These findings demonstrate that the hybrid sensing film based on PANI@Au-TiO 2 ternary composites exhibits excellent ammonia detection performance at room temperature, thereby offering a promising pathway for the development of advanced ammonia sensors.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-12
·
IF 16.6
Chen Jianjun,Xiong Shangchao,Liu Haiyan,Shi Jianqiang,Mi Jinxing,Liu Hao,Gong Zhengjun,Oliviero Laetitia,Maugé Françoise,Li Junhua
The spillover of oxygen species is fundamentally important in redox reactions, but the spillover mechanism has been less understood compared to that of hydrogen spillover. Herein Sn is doped into TiO 2 to activate low-temperature (<100 °C) reverse oxygen spillover in Pt/TiO 2 catalyst, leading to CO oxidation activity much higher than that of most oxide-supported Pt catalysts. A combination of near-ambient-pressure X-ray photoelectron spectroscopy, in situ Raman/Infrared spectroscopies, and ab initio molecular dynamics simulations reveal that the reverse oxygen spillover is triggered by CO adsorption at Pt 2+ sites, followed by bond cleavage of Ti-O-Sn moieties nearby and the appearance of Pt 4+ species. The O in the catalytically indispensable Pt-O species is energetically more favourable to be originated from Ti-O-Sn. This work clearly depicts the interfacial chemistry of reverse oxygen spillover that is triggered by CO adsorption, and the understanding is helpful for the design of platinum/titania catalysts suitable for reactions of various reactants.
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WATER SCIENCE AND TECHNOLOGY
·
2021
·Vol. 84
·期 5
·1228-1244
·
IF 1.915
Ma Shuangchen,Liu Chang,Xu Yongyi,Tan Yu,Yang Dingchang,Wang Feng,Ma Lan
A new capacitive deionization (CDI) technology was used to remove Cl − from desulfurization wastewater. TiO 2 and carbon nanotubes (CNTs) were combined with N-methyl pyrrolidone (NMP) to form composites by a solvothermal method in which it is coated onto the CDI anode to improve dechlorination efficiency (DE). The morphology, surface area, wettability, crystal structure and chemical composition of the TiO 2 /CNTs were characterized. They showed good hydrophilicity (contact angle: 85.9°), high specific surface area (96.68 m²/g) and high specific capacitance (87.6 F/g). The experimental results illustrated that the best DE was achieved by the composites (60%T/C) under 1.2 V with the maximum electrosorption capacity toward 6.5 mg/g, and the TiO 2 /CNTs composites had excellent stability. Adsorption kinetics analysis was explored and analyzed. Furthermore, TiO 2 /CNTs composites exhibited excellent DE in actual desulfurization wastewater. The catalysis and adsorption mechanisms of the TiO 2 /CNTs anode were discussed in detail. This study provides a new direction for the application of TiO 2 /CNTs composites as adsorption materials of CDI in the Cl − of desulfurization wastewater. The TiO 2 /CNTs materials were used as adsorption materials for a CDI anode to remove Cl − from desulfurization wastewater. TiO 2 /CNTs were synthesized by using a solvothermal method based on Ti 4+ combining NMP along with CNTs as precursor solution. This study will provide a new direction for the application of TiO 2 /CNTs composite material as adsorption materials for CDI in actual desulfurization wastewater.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Feng Zhang,Yingting Sun,Miao Li,Qingyao Wang,Wenqing Song,Jingui Ma,Junwei Hou
Ternary oxide semiconductor could effectively adjust the energy band gap and location by changing the elemental ratio, which remarkably benefits the electron transfer and photoelectrocatalytic H 2 generation. In this paper, hydrangea-like CuBi 2 O 4 sensitizers were prepared on TiO 2 nanotube arrays (TiO 2 NTAs) by one-pot solvothermal deposition. The alkali kind showed vital influences on the microstructure and photoelectrocatalytic performance of CuBi 2 O 4 /TiO 2 NTAs, and the excellent pollutant remediation, photoelectric conversion and photoelectrocatalytic water splitting were achieved by the sample prepared by C 6 H 12 N 4 . Under visible light irradiation, the optimized sample displayed the higher photoelectrocatalytic H 2 generation rate (87.42 μmol·cm −2 ·h −1 ) than that of samples prepared using other alkali kinds. Moreover, the CuBi 2 O 4 /TiO 2 NTAs also exhibited high organic dye and Cr(VI) removal performance, and the outstanding photoelectrocatalytic activity indicates the novel strategy for the construction of CuBi 2 O 4 /TiO 2 NTAs photocatalyst for H 2 generation by effective photocatalytic water splitting .
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JOURNAL OF HAZARDOUS MATERIALS
·
2017
·
IF 6.065
Xiulei Fan,Chao Wang,Peifang Wang,Bin Hu,Xun Wang
Most studies investigating the influence of TiO 2 NPs on heavy metal bioavailability have focused on the aqueous phase; however, few have examined the sediments containing more nanoparticles. Here, we investigated the effects of TiO 2 NPs on heavy metal bioavailability in C. fluminea in sediments. The interactions between the TiO 2 NPs and metals in sediments, the influence of TiO 2 NPs on metals levels in aqueous phase and geochemical speciation were also explored. The results indicated the large adsorption capacity of TiO 2 NPs and the strong adsorption affinity to metals caused the metals adsorbed on nanoparticles, which decreased the metals concentrations in water phase. Changes in metal speciation caused by metals in EXC, CAR, and IMO partly transported from sediments to TiO 2 NPs during the aging of sediments. Heavy metals contents in C. fluminea tissues were in the order of gill > visceral mass > mantle > foot and increased with the increasing TiO 2 NPs contents in sediments. TiO 2 NPs enhanced the bioavailability of metals in the speciation of EXC, CAR, and IMO in sediments by the Trojan horse effects. The results can facilitate a more realistic evaluation of the environmental risks of TiO 2 NPs to benthic organisms in heavy metal-contaminated sediments.
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JOURNAL OF POWER SOURCES
·
2013
·
IF 4.675
Lei Tan,Lei Pan,Chengying Cao,Baofeng Wang,Lei Li
Anatase TiO 2 has attracted much attention as a safe anode material for lithium-ion battery applications, due to its low electronic conductivity and severe aggregation during Li + insertion/extraction processes, the practical application of the anatase TiO 2 is still hindered by poor long-term cycling stability. In order to improve the cycling performance of lithium-ion batteries, a uniform thin nitrogen-doped carbon layer with a thickness of 3–6 nm is successfully coated on the surface of the anatase TiO 2 nanoparticles by using polydopamine as carbon precursor. Compared with the pristine TiO 2 electrode, the carbon coated TiO 2 nanocomposites electrodes show very good capacity retention and cycling performance.
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MATERIALS CHARACTERIZATION
·
2021
·
IF 4.342
Ning Peng,Yongzhao Li,Xiaofei Yang,Libo Liang
The porous hydrous oxide layer obtained from the hydrothermal treatment of etched aluminum foil was used for fabricating the composite TiO 2 -Al 2 O 3 oxide film during anodization of the TiO 2 -coated aluminum foil. The results indicated that the TiO 2 -coated film obtained in the etched tunnels containing hydrous oxide layer was more tightly adsorbed with a more consistent compactness. The porous hydrous oxide layer facilitates the anchoring of TiO 2 sol particle, resulting in the tight coupling of the coated-TiO 2 film and the anodized alumina . Moreover, the porous hydrous oxide layer is beneficial to the migration of the Ti element to form the composite layer. It is indicated from the performance testing that the etched aluminum foil with hydrothermal treatment, and then 2 coating cycles, can improve the specific capacitance observably.
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JOURNAL OF POWER SOURCES
·
2014
·
IF 5.211
Menghua Zhu,Xin Li,Weiwei Liu,Ying Cui
The graphene–TiO 2 nanocomposite has been prepared by mixing graphene oxide (GO) and tetra- n -butyl titanate (TBT) followed by the facile hydrothermal process when the reduction of GO to reduced graphene oxide (RGO) and the hydrolysis of TBT to TiO 2 happen. Characterization of the graphene–TiO 2 nanostructures is investigated in detail by X-ray diffraction, scanning electron microscopy, transmission electron microscopy , and Raman spectroscopy . A dye-sensitized solar cell (DSSC) based on graphene–TiO 2 composite photoelectrode exhibits a high energy conversion efficiency of 4.28%, compared with a DSSC based on pure TiO 2 photoelectrode (3.11%), accompanied by an increment in both short-circuit photocurrent density and open-circuit voltage. The significant enhancement in performance of DSSC is investigated through intensity-modulated photovoltage spectroscopy, intensity-modulated photocurrent spectroscopy, and electrochemical impedance spectroscopy . It is found that the incorporation of two-dimensional graphene nanosheets in the TiO 2 electrodes is the key factor leading to the improved photogenerated electron transfer ability and reduced charge recombination.
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