Small
·
2020
·Vol. 16
·期 26
·2000030
·
IF 11.459
Yaru Liang,Xiang Xiong,Zhuijun Xu,Qingbing Xia,Liyang Wan,Rutie Liu,Guoxin Chen,Shu-Lei Chou
Lithium-ion batteries (LIBs) have been widely applied and studied as an effective energy supplement for a variety of electronic devices. Titanium dioxide (TiO 2 ), with a high theoretical capacity (335 mAh g −1 ) and low volume expansion ratio upon lithiation, has been considered as one of the most promising anode materials for LIBs. However, the application of TiO 2 is hindered by its low electrical conductivity and slow ionic diffusion rate. Herein, a 2D ultrathin mesoporous TiO 2 /reduced graphene (rGO) heterostructure is fabricated via a layer-by-layer assembly process. The synergistic effect of ultrathin mesoporous TiO 2 and the rGO nanosheets significantly enhances the ionic diffusion and electron conductivity of the composite. The introduced 2D mesoporous heterostructure delivers a significantly improved capacity of 350 mAh g −1 at a current density of 200 mA g −1 and excellent cycling stability, with a capacity of 245 mAh g −1 maintained over 1000 cycles at a high current density of 1 A g −1 . The in situ transmission electron microscopy analysis indicates that the volume of the as-prepared 2D heterostructures changes slightly upon the insertion and extraction of Li + , thus contributing to the enhanced long-cycle performance.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
NANO
·
2016
·
IF 0.951
Dewang Kong,Min Zhao,Shikuo Li,Fangzhi Huang,Jiming Song,Yupeng Yuan,Yuhua Shen,Anjian Xie
In this paper, a facile and efficient method combined sol–gel method with hydrothermal process was employed for preparing titanium dioxide (TiO 2 ) /reduced graphene oxide (rGO) nanocomposites without using any reductants or surfactants. This approach leads to the reduction of graphene oxide (GO) and the growth of TiO 2 nanorods simultaneously. The results reveal that the TiO 2 short nanorods with average size of 15 nm in length and 10 nm in diameter were uniformly grown on the rGO sheets with high dispersion. Compared with the pure TiO 2 nanoparticles, the TiO 2 /rGO composites exhibit strong absorption in the visible light range. The photocurrent density of nanocomposites reached 0.826 mA/cm 2 under the simulated sunlight illumination, which is 3.5 times than that of pure TiO 2 . An enhancement of photocatalytic hydrogen formation rate for the water splitting was observed over the TiO 2 /rGO composite photocatalysts, the fastest formation rate can reach 889.28 μ mol ⋅ g − 1 ⋅ h − 1 when TiO 2 coupling with 1wt.% rGO. Also the hydrogen production rate is about 3.27 times larger than pure TiO 2 and 2.23 times than P25 due to the excellent electron trapping and transportation properties of rGO and the synergistic effect between TiO 2 and rGO.
研究领域:
材料科学
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纳米技术
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Chengxue Li,Xiaojian Jiang,Jianhong Liu,Chunhui Zhang,Chunxiu Liu,Huikai Nan,Yubing Dong
To extend the service life of shape memory ethylene-vinyl acetate (EVA), the titanium dioxide/reduced graphene oxide/EVA composites (TiO 2 -P/rGO/EVA and TiO 2 -PF/rGO/EVA) were prepared by an impregnation method and modified with triethoxy-1H,1H,2H,2H-tridecafluoro-n-octylsilane and 1H, 1H, 2H, 2H-perfluorooctyltrichlorosilane as hydrophobic agents, respectively. The hydrophobic/anti-icing properties, surface durabilities, shape memory properties, and UV-aging resistance of the composites were systematically investigated. The TiO 2 /rGO/EVA composites exhibit exceptional hydrophobic and anti-icing performance. The TiO 2 -P/rGO/EVA composites and TiO 2 -PF/rGO/EVA composites displayed water contact angles of 150.7° and 152.2°, respectively, with sliding angles of 6.4° and 4.9°, and both retained these values after durability tests. Frozen droplets on the TiO 2 -P/rGO/EVA composites could melt and slide off after 36 s of NIR irradiation. The composite displayed outstanding two-way shape memory behavior with multi-stimuli responsiveness, achieving reversible deformation under either 40 V electrical stimulation or NIR irradiation. It also possessed near-complete UV shielding (≈ 100%) and remarkable UV resistance: after 14 days UV exposure, it maintains 22.10% reversible strain and 99.35% shape recovery ratio; after 28 days, relative electrical conductivity remains at 87.5%. Hydrophobicity persists for over 48 h under UV irradiation in N 2 atmosphere. Furthermore, the TiO 2 /rGO/EVA composites surface wettability can be modulated through UV irradiation-washing-recoating cycles.
研究领域:
材料科学
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智能材料
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聚合物复合材料
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刺激响应材料
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表面工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xin Jiang,Di Yin,Ming Yang,Juan Du,Weie Wang,Lei Zhang,Libin Yang,Xiaoxia Han,Bing Zhao
The strong interface interaction, especially interfacial charge transfer (CT) behavior, in TiO 2 /reduced graphene oxide (TiO 2 /rGO) nanocomposite endows the advanced hybrid material with extensive availability in dye-sensitized solar cells, photocatalysis , etc. Thus, revealing and understanding of the interfacial CT process are a crucial and interesting issue, owing to its vital contributions to optoelectronic and electronic properties. In this work, the TiO 2 /rGO nanocomposites with anchoring of TiO 2 nanoparticles on rGO nanosheets have been fabricated, and a surface-enhanced Raman scattering (SERS) strategy with 4-mercaptobenzoic acid (4-MBA) as probe was performed to reveal the interfacial CT in the nanocomposites. There are obvious enhancements in the SERS intensity and the degree of CT (ρ CT ) in the 4-MBA/TiO 2 /rGO/4-MBA system compared with those of 4-MBA/TiO 2 and 4-MBA/TiO 2 + rGO/4-MBA (TiO 2 + rGO is a physical mixture of TiO 2 and rGO) due to the chemical interaction and the interfacial CT between TiO 2 and rGO in the nanocomposite. It is indicated that the interfacial chemical interaction in the nanocomposite is an essential requirement for occurrence of the interfacial CT. The interfacial CT process can be evaluated quantitatively by the ρ CT in SERS spectrum. The ρ CT shows an obvious increasing trend with the increase of rGO amount in TiO 2 /rGO nanocomposites, and then reaches a saturation when the amount of rGO is 1.0%. And also, to further understanding of this CT progress, the model of the CT mechanism has been proposed. Furthermore, as-prepared TiO 2 /rGO nanocomposite can also be served as an effective SERS-active substrate for the ultrasensitive detection of analytes. The minimum detectable concentration of 4-MBA on the TiO 2 /rGO substrate can reach to 1 × 10 −7 mol/L, which is comparable to a noble metal substrate. Even, for p -aminothiophenol target molecule whose SERS signals cannot almost be observed on the ordinary TiO 2 substrate, the minimum detectable concentration can reach to a value as low as 1 × 10 −8 mol/L on the TiO 2 /rGO substrate.
研究领域:
材料科学
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物理化学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 68
·36040-36045
·
IF 3.708
Yan Liu
Composites of titanium dioxide–reduced graphene oxide (TiO2–RGO) have been prepared via an efficient and facile hydrothermal reaction of graphene oxide and Ti(OH)4 in a ethanol–water solvent. The structure and composition of the composites have been characterized by X-ray diffraction, Scanning electron microscopy, Brunauer–Emmett–Teller specific area analysis, X-ray photoelectron spectroscopy and ultraviolet-visible diffuse reflectance spectroscopy. The results showed that the TiO2–RGO composites exhibited a layered structure with well-dispersed anatase TiO2 on the surface of the reduced graphene oxide. Compared with the pure TiO2 nanoparticles, the composites had larger surface area, and extended the photoresponse range to the visible light region. The photocatalytic activity of the composites was much higher than that of TiO2 in the photodegradation of methyl orange (MO) under visible light irradiation.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SUPERLATTICES AND MICROSTRUCTURES
·
2018
·
IF 2.099
Ni Sun,Jing Ma,Chao Wang,Juanqin Xue,Liangsheng Qiang,Jieli Tang
A facile and efficient one-step hydrothermal method was performed to prepare the TiO 2 /reduced graphene oxide (TiO 2 /rGO). The obtained materials were characterized by X-ray diffraction (XRD), Raman spectra , transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS) and UV–vis diffuse reflectance spectra. The results showed that the well dispersed TiO 2 nanoparticles with anatase were found uniformly distributed throughout the surface of rGO sheets. The as-prepared composite was used to photocatalytic degradation of Methylene blue (MB), and the experiment results show that TiO 2 /rGO exhibited an enhanced photocatalytic activity for MB degradation under visible-light irradiation compared to Degussa P25, which was attributed to extended light absorption and increased charge separation efficiency due to excellent electrical properties of GO and the chemical bond between rGO and TiO 2 nanoparticles. The composite maintained a higher level of activity after five recycles without any significant loss of photo-catalytic activity. The results manifested that the facile synthesis via a one-pot hydrothermal treatment can provide an effective approach to enhance the performance of TiO 2 /rGO, which is a promising candidate in wastewater treatment application.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2018
·Vol. 24
·期 3
·272-281
·
IF 0
Xu Fengyun,Na Ping
Novel three-dimensional string and ball-like titanium dioxide/reduced graphene oxide, TiO 2 /rGO (STG) composites were prepared using a one-step hydrolysis process followed by a low-temperature hydrothermal treatment. The STG composites exhibited excellent photo-catalytic degradation performance for methylene blue owing to a good synergistic effect between TiO 2 and rGO. The STG composites with 1.0 wt% of rGO loading exhibited the highest removal rate of 86.0% for methylene blue and its reaction rate constant (5.27 × 10 −3 min −1 ) was much higher than those of pure string and ball-like TiO 2 (ST). In addition, the STG composites also showed an outstanding capability for the photo-catalysis degradation of other cationic dyes. In addition, a possible photo-catalytic degradation mechanism for the STG composite was postulated, in which \(^{ \bullet } {\text{O}}_{2}^{ - }\) and • OH were the main oxidizing groups. This work offers new insights into a better design and preparation of novel composite materials for the removal of organic dyes.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Wen-Bei Yu,Heng-Rui Zhang,Hong-Wei Zhang,Yao Liu,Yu Li,Bao-Lian Su
Carbon materials are commonly integrated with TiO 2 to achieve high carrier mobility and excellent photocatalytic performance, and the chemical bond between TiO 2 − C is considered as a significant strategy to enhance efficiency. Nevertheless, few analyses have elucidated the formation mechanism of Ti 3 + − C bonds and the underlying reasons for the performance enhancement. To address these issues, this study conducts an in-depth investigation into the electronic structure of TiO 2 − C and demonstrates that the charge in the nonbonding molecular orbital t 2 g of Ti 3 + is transferred to the unoccupied 2 p energy level of C through the formation of 1π and 2π bonds, i.e., (Ti 3 d xz - C 2 p y ) and (Ti 3 d xy - C 2 p x ). The hybridization of t 2 g -2 p orbitals endows the Ti 3 + − C bond with higher carrier mobility and a stronger binding force, thereby contributing to stable photocatalytic H 2 production. Inspired by this scenario, the NSTiO 2 /rGO hybrid architecture, featuring the {101}/{001} surface heterojunction and the Ti 3 + − C interfacial chemical bond, has been constructed. As a result, the hybrid catalyst exhibited excellent photocatalytic cycling stability of 92.9 % $92.9 \,\%$ and an H 2 evolution rate of 33.4 mmolh −1 g −1 . This work proposes a strategy for designing efficient photocatalyst by regulating orbitals to achieve high-performance photocatalytic methanol splitting.
研究领域:
材料科学
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化学工程
·
能源科学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Liguo Wei,Xiaohu Xu,Lishuang Zhao,Junyun Liu,Run Wang,Xindan Zhang
To improve the photovoltaic performance of the traditional TiO 2 photoanode for dye-sensitized solar cells (DSSCs), a series of layered TiO 2 /rGO composited DSSCs photoanode was assembled by changing the morphologies of the TiO 2 and introducing reduced graphene oxide (rGO) into different areas of the photoanode films. Firstly, TiO 2 nanoflowers (TiO 2 -NFs), TiO 2 nanorods (TiO 2 -NRs) were prepared employing the hydrothermal method and used as photoanode materials to explore the synergistic effect of TiO 2 with different morphologies in layered photoanode. Then, TiO 2 -NFs/rGO composited photoanode (TNF/rGO) were fabricated to research the mechanism of rGO on improving electron transmission in the layered photoanode. The effect of adding rGO at different parts of the layered photoanode on the performance of DSSCs was also investigated. Attributing to the enhancement of light absorption and charge transfer, a champion power conversion efficiency ( η ) of 9.21 % ( J sc = 23.36 mA cm −2 , V oc = 0.74 V, FF = 0.53) was achieved with the layered TiO 2 /rGO composited photoanode containing two consecutive layers of TiO 2 -NFs/rGO and P25/rGO, which exhibited an 82.01 % increase than traditional TiO 2 (pure P25) photoanode ( η = 5.06 %, J sc = 12.09 mA cm −2 , V oc = 0.73 V, FF = 0.58). It is an effective way to design and fabrication of layered TiO 2 /rGO composited photoanode to regulate the photovoltaic performance of traditional TiO 2 photoanode for DSSCs based on the synergistic effect of its multi-layer structure, TiO 2 morphologies and introduction of rGO.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2019
·Vol. 25
·期 10
·4675-4684
·
IF 2.289
Zhang Peng,Ru Qiang,Gao Yuqing,Yan Honglin,Hou Xinhua,Chen Fuming,Hu Shejun,Zhao Lingzhi
Novel porous nano-silicon/TiO 2 /rGO@carbon anodes with superior lifespan and desirable cycling stability are prepared by a step-wise synthetic procedure. The hybrid exhibits a high specific capacity of 1073.43 mAh g −1 at a current density of 500 mA g −1 . Additionally, it delivers a reversible capacity of 724.08 mAh g −1 at 1000 mA g −1 even after 1000 long-term cycles. Simultaneously, a large average capacity is reinstated after cycling at high rates, such as 994.76, 743.33, and 599.70 mAh g −1 at 1000, 2000, and 3000 mA g −1 , respectively. The greatly ameliorative electrochemical characteristics could be attributed to the abundant buffering space of hierarchical architecture, good separation of mechanically robust anatase-TiO 2 , sustainable confinement of elastic carbon skeletons, as well as improved electrical conductivity of rGO, which could suppress drastic volume variations and promote multiple Li + /electron transport without distinct pulverization.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2019
·
IF 3.834
Yaqi Hou,Shengyan Pu,Qingqing Shi,Sandip Mandal,Hui Ma,Shengyang Xue,Guojun Cai,Yingchen Bai
New approaches and practices to improve photocatalytic efficiency of materials for remediation of organic and inorganic pollutant has become a top priority. We have developed a graphene-oxide based ternary composite Ag/TiO 2 /rGO as a green catalyst, and the photocatalytic oxidation and reduction efficiency of the catalyst was thoroughly evaluated for Cr(VI) and tetracycline (TC) remediation in water as potential contaminants. The results suggested that the electronic coupleing system exhibits excellent photocatalytic activity, mainly due to affecting light absorption and higher e − / h + separation efficiency. The photocatalytic activity of the silver-deposited graphene-supported silver and titanium dioxide was 4.3 and 2.5 times for Cr (VI) and TC remediation, respectively. Furthermore, the service life of the photocatalyst was also evaluated within five recycling studies, indicating that the efficiency of the obtained photocatalyst was maintained above 80%. Electron paramagnetic resonance spectroscopy and the addition of free radical scavengers confirmed that e − act as reducing agents and may be the key (O 2 ·− ) to the degradation process. The photocatalytic mechanism was proposed based on the studies obtained. Green catalysts based on graphene-based ternary composites developed in this work can provide effective and economic remediation at higher scale and offer practical application of photo catalysis technology.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·123675
·
IF 7.5
Bicai Li,Hongrui Zhao,Chenxi Li,Hui Fu,Yuanping Li,Yi Huang,Guowen He
Biorefractory protein-like dissolved organic matter (DOM) in swine wastewater presents a formidable challenge for photocatalytic degradation, whereas binary photocatalysts suffer from intrinsic limitations of inefficient charge separation and poor selective DOM adsorption. To mitigate these critical drawbacks, we designed ZnO/TiO 2 -rGO ternary photocatalysts with tunable oxygen vacancy (O V ) concentrations and a Type Ⅱ heterojunction by regulating rGO dosages via a two-step hydrothermal method, achieving dual optimization of charge transfer dynamics and selective DOM adsorption. The optimal ZTR-4 catalyst (O V concentration 45.32%) achieved 69.40% protein-like DOM removal, with a rate constant 3.4 and 2.3 times higher than binary composites (ZR and TR). Excitation-emission matrix (EEM) and UV–visible spectral analyses confirmed the conversion of labile protein-like DOM to refractory humic-like and fulvic-like substances via oxidative condensation and Maillard reactions, with superoxide anion radicals (·O 2 - ) and photogenerated holes ( h + ) serving as the dominant reactive species. The enhanced performance stemmed from the synergy of heterojunction-mediated charge separation, rGO-facilitated electron transport, π-π adsorption, and O V -induced photogenerated carrier recombination suppression. This work not only verifies the application potential of the as-prepared materials in real livestock wastewater, but also clarifies the intrinsic degradation and humification mechanisms of complex DOM.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）