MATERIALS CHEMISTRY AND PHYSICS
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2023
·
IF 4.6
Yao Liu,Ning Jiang,Mingjie Lyu,Jinwei Wei,Gongxiang Wei,Xin Han,Qiaoyan Shang,Qian Zhang,Yunyan Liu,Huiqiang Liu,Xifeng Shi
How to improve photon absorption , photoelectric conversion efficiency, and carrier separation and transfer efficiency is a huge challenge for promoting the efficiency of photoelectrochemical (PEC) water splitting. Herein, the black phosphorus nanosheets (BPNs) was assembled on the surface of TiO 2 nanorods arrays (TiO 2 NAs) through electrostatic attraction to form TiO 2 /BP heterojunction material. Meanwhile, Ag nanoparticles were successfully loaded on the surface of TiO 2 /BP heterojunction material to form Ag nanoparticles modified TiO 2 /BP heterojunction composite material. The TiO 2 /BP heterojunction modified by Ag nanoparticles nanostructures exhibited a remarkable enhancement in the PEC water splitting in comparison with the pristine TiO 2 . Photoelectrochemical performance at 1.23 V vs. RHE bias-potential under 100 mW cm −2 solar light illumination shows that synthesized Ag–TiO 2 /BP photoanode displaying the highest photocurrent density of 1.74 mA cm −2 , which is practically 3.34 times higher than that of pristine TiO 2 (0.52 mA cm −2 ), presenting a significantly improved PEC performance for water splitting. After 18 months, the photocurrent of synthesized Ag–TiO 2 /BP photoanode can still reach 1.63 mA cm −2 , and the performance is stable. It demonstrated that the formation of heterojunction by electrostatic attraction of TiO 2 and BP and then modification with Ag nanoparticles is an effective strategy for improving the PEC water splitting.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2014
·Vol. 73
·期 2
·314-321
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IF 1.547
Jiang Bo,Jiang Liangliang,Shi Xuewei,Wang Wenchao,Li Guisheng,Zhu Fengxia,Zhang Dieqing
Ag 2 O/TiO 2 nanorods heterojunctions were synthesized by an environmentally benign approach, including hydrothermal treating TiCl 4 aqueous solution for the formation of rutile TiO 2 nanorods and precipitating Ag 2 O quantum dots on the surface of rutile TiO 2 nanorods. The as-obtained Ag 2 O quantum dots were highly uniformly deposited on the surface of rutile TiO 2 rods for the formation Ag 2 O/TiO 2 heterojunctions photocatalyst. Such photocatalyst was characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, N 2 adsorption desorption, UV–Vis diffuse reflectance spectroscopy. The photocatalytic activities of the samples were evaluated by phenol under visible-light irradiation. It was found that the optimal Ag:Ti molar ratio (4:10) contributed the highest photocatalytic performance for removing phenol (10 mg/L) with a degradation rate of 66 %, about 11 and 5 times of that of the pure rutile TiO 2 nanorods and N-doped TiO 2 , respectively, after 40 min of reaction under visible light irradiation (λ > 420 nm). Such greatly enhanced photocatalytic performance of the as-prepared photocatalysts was attributed to the strong Ag 2 O/TiO 2 heterojunctions, 1D rutile TiO 2 architecture, and high visible light absorption capability.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Minji Yang,Huichao He,Hongping Zhang,Xiaohui Zhong,Faqin Dong,Gaili Ke,Yaqi Chen,Jinyan Du,Yong Zhou
High surface states induced photoelectrochemical (PEC) activity and stability issue is the major performance bottleneck for nanostructured WO 3 photoanode. Here we report that amorphous TiO 2 ( α -TiO 2 ) be used as passivator to modify the surface states of WO 3 nanoflakes film for improving its PEC water oxidation performance. In comparison with bare WO 3 film, the α -TiO 2 -coupled WO 3 ( α -TiO 2 /WO 3 ) film is of higher PEC water oxidation activity and stability. The photocurrent on α -TiO 2 /WO 3 film photoanode is improved by 2 times that reached 1.4 mA/cm 2 in 0.1 M Na 2 SO 4 solution at 0.8 V ( vs. SCE). After α -TiO 2 coupling, the UV–vis absorption edge and intensity of WO 3 film do not change obviously, but the formation and oxidation kinetics of H 2 O 2 on WO 3 photoanode are modified. The density functional theory calculations indicate the monoclinic WO 3 (002) has a surface energy of 1.17 J/m 2 , whereas the α -TiO 2 /WO 3 (002) with a much lower surface energy of 0.3 J/m 2 . Additionally, the length of Ti O bond of α -TiO 2 is changed from the initial 1.929 Å to a shorter length of 1.886 Å and a longer length of 2.290 Å in α -TiO 2 /WO 3 (002) through the O 2- -W 6+ bonding effect at α -TiO 2 /WO 3 interface. Therefore, the enhanced PEC water oxidation performance on α -TiO 2 /WO 3 film can be attributed to that α -TiO 2 passivates the surface states of WO 3 nanoflakes film, and the formation of H 2 O 2 from the photoexcited-electrons/dissolved-oxygen route is depressed and the PEC oxidation of H 2 O 2 is accelerated.
研究领域:
材料科学
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能源化学
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计算化学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2016
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IF 7.145
Meng He,Xiaoyi Chen,Kui Cheng,Wenjian Weng,Huiming Wang
The topography at the micro-/nanoscale level and bioactive composition of material surfaces have been thought to play vital roles in their interactions with cells. However, it is still a challenge to further modify special topography with biodegradable composition or vice versa. In this study, TiO2 nanorod films covered with microscale-distributed Zn-containing calcium phosphate (Zn-CaP) were prepared, trying to create a micro-/nanoscale topography and Zn2+ release capability. MC3T3-E1 cells cultured on TiO2 nanorod film with sparsely distributed Zn-CaP (TiO2/S-ZCP) had significantly higher biological responses than those on the films with densely distributed Zn-CaP (TiO2/D-ZCP) and fully covered Zn-CaP (F-ZCP). TiO2/S-ZCP film was demonstrated to facilitate osteogenic differentiation much more strongly than F-ZCP and TiO2/D-ZCP films based on evaluations of ALP, related gene expressions, and extracellular matrix mineralization. The higher osteogenic differentiation on TiO2/S-ZCP film is ascribed to the micro-/nanoscale topography from Zn-CaP coverage promoting cell adhesion and filopodia extension, and inducing differentiation-orientation in the initial stage. And consequently Zn2+ release results in enhancement of differentiation. Therefore, we believe that better organization of the micro-/nanotopography and bioactive ion release on the surface would be a promising way to enhance osteogenic activity for orthopedic and dental implants.
研究领域:
生物材料学
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组织工程学
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细胞生物学
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产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2017
·
IF 2.084
Sumin Li,Hui Jiang,Tao Tang,Yijing Nie,Zhao Zhang,Qin Zhou
As a potential electrolyte for energy storage devices, mesoporous TiO 2 -doped epoxy-based composite electrolytes were fabricated. The presence of mesoporous TiO 2 in the composites promotes the cross-linking reaction of epoxy resin , as well as reduces the charge transfer resistance and favors the ionic transport, providing the composite electrolytes with enhanced electrochemical performance , mechanical strength and thermal stability. The highest ionic conductivity (11 × 10 −5 S cm −1 ), ionic transference number (0.661) and compression strength (5.06 MPa) were obtained for a composite electrolyte with 6 wt% doped mesoporous TiO 2 . The nano-structured reinforcing phase is beneficial to the enhancement in the electrochemical and mechanical performances of electrolyte simultaneously.
研究领域:
材料科学
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能源存储
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产品关联
DOI
高影响因子
Reaction Chemistry & Engineering
·
2022
·Vol. 7
·期 4
·917-928
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IF 5.2
Tongxin Xiao,Ying Chen,Yuning Liang
The conversion of CO2 and water into valuable chemicals under sunlight irradiation is of great significance for solving the widespread problems of both limited energy sources and global warming. In this work, new artificial photosynthesis was established through a photocatalysis process of reducing CO2 to CH4. A photocatalyst compounded from a porphyrin (metalloporphyrin) and TiO2 nanotube arrays (TiO2NTs) was prepared, and its photocatalytic performance for CO2 reduction under Xe lamp irradiation was studied. Compared with the pure TiO2NTs, the photocatalytic CO2 reduction activity of metalloporphyrin-sensitized TiO2NTs is significantly enhanced. The amount of methane produced with the cobalt tetra(4-carboxyphenyl)porphyrin/TiO2NTs (CoTCPP/TiO2NTs) photocatalyst is about 5.5 times higher than that produced with TiO2NTs alone. The improvement of photocatalytic activity can be ascribed to the enhancement of light absorption ability of CoTCPP/TiO2NTs and the inhibition of electron–hole recombination. Furthermore, according to the results of the photocatalytic and photo(electro)chemical experiments, a probable mechanism for the photoreduction of CO2 over CoTCPP/TiO2NTs is presented.
研究领域:
化学
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环境科学
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材料科学
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产品关联
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
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2022
·Vol. 24
·期 8
·2101603
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IF 4.122
Jianhong Dong,Yongshuai Xie,Lixin Liu,Zhezhe Deng,Wei Liu,Luyi Zhu,Xinqiang Wang,Dong Xu,Guanghui Zhang
Low density, heat-resistant sponge-like fiber assembly materials are considered as promising high-temperature insulation materials. However, the poor structural stability, infrared radiation heat transfer, and complex preparation process limit its further application. Herein, a facile method to create ultralow-density ZrO 2 –TiO 2 fiber sponges by the electrospinning method followed by heat treatment is presented. The layered structure sponges treated at 1200 °C have a low density of 9.5 mg cm −3 . Moreover, the sponges possess high compressibility and good compression resistance over a wide temperature range from −196 to 1200 °C. In addition, the sponges exhibit low thermal conductivity of 27 mW m −1 K −1 , robust fire resistance, and high near-infrared reflectance, making them an ideal alternative for high-temperature thermal insulation materials.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
Frontiers in Chemistry
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2022
·
IF 5.545
Zhao Jun,Deng Nengmei
The thermal decomposition performance of an oxidizer directly determines the thrust and specific impulse properties of the solid propellant. Hexagonal boron nitride (h-BN) has the characteristics of high catalytic activity and good stability, which can improve the heat release and decomposition temperature of the oxidant, and then improve the energy performance of the propellant. In this study, a novel hybrid material TiO2 NPs/h-BN was successfully prepared by in situ growth, and it was found that when 5 wt.% TiO2 NPs/h-BN was added, the initial decomposition temperature of ammonium perchlorate (AP) decreased by 67.6°C. Due to the addition of TiO2, the gap between the h-BN layers as well as the specific surface increased, which optimized its thermocatalytic performance, and it also proposed a catalytic mechanism for the thermal decomposition process of AP.
研究领域:
材料科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
MRS Communications
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2023
·Vol. 13
·期 4
·538-545
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IF 1.9
Yin Jinkun,Chu Yaoqing,Tan Lianjiang
Cu/N co-doped TiO 2 nanopowder was prepared with a facile sol–gel method. In the absence of stabilizing agents, the co-doped nanopowder with nanoscaled particle sizes was obtained. Doping didn’t change the anatase crystal structure of TiO 2 . Cuprite Cu 2 Cl(OH) 3 formed in the co-doped nanopowder. Based on ultraviolet–visible (UV–vis) spectroscopy and X-ray photoelectron spectroscopy (XPS) data, the mechanisms of significantly improved photocatalytic activity of the co-doped nanopowder were discussed. The antibacterial evaluation and cytotoxicity test suggested the nanopowder inhibited bacteria significantly under visible light and had ultralow cytotoxicity. This work provided a promising antibacterial agent with potential biomedical applications.
Graphical abstract
研究领域:
材料科学
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生物医学
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产品关联
DOI
高影响因子
International Journal of Electrochemical Science
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2023
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IF 1.5
Kang Li,Mingfang Zhu,Hongwu Zhang,Jie Zhao
A novel voltammetric sensor based on TiO 2 nanoparticles and graphene composite (GR/TiO 2 ) was developed. The nanocomposite modified glassy carbon electrode was characterized using scanning electron microscope (SEM). The electrochemical behavior of phenylephrine hydrochloride (PHE) was investigated on this sensor. The results indicated that the GR/TiO 2 modified electrode exhibited efficient electrocatalytic oxidation for PHE with about 2.87 times higher current response. Using differential pulse voltammetry (DPV), the GR/TiO2 modified electrode exhibited a linear voltammetric response for PHE in the concentration range of 5.0×10 -7 -2.0×10 -5 mol L -1 , with the limit of detection (LOD) of 2.0 × 10 -7 mol L -1 (S/N=3). The sensor was applied to determine PHE in urine and human serum samples were studied.
研究领域:
分析化学
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药物分析
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纳米材料科学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2023
·
IF 13.6
Yu Tu,Sijia Sun,Hao Ding,Xuan Wang,Zewei Wu
Photocatalytic activation of persulfate has exhibited tremendous potential in water purification because of its green and environmentally friendly process. However, this process often exhibits low activation efficiencies and difficult recovery of the photocatalyst. Herein, schorl-supported nano-TiO 2 composite photocatalysts (S/TiO 2 ) were prepared by a mechanical grinding method for efficient activation of potassium monopersulfate (PMS). The anatase TiO 2 nanoparticles with particle size of approximately 30 nm was uniformly loaded on the surface of schorl via forming Si-O-Ti bonds. The S/TiO 2 assisted with PMS (S/TiO 2 -PMS) exhibited remarkable degradation performance and stability. In this system (S/TiO 2 -PMS), the C/C 0 value of phenol solution (10 ppm) were decreased to 0.070 and 0 after 30 min and 90 min of irradiation, where the degradation extent were 93.0% and 100% respectively. The rate of phenol degradation with S/TiO 2 -PMS was 12.6 times that seen with TiO 2 -PMS. The oxidation active species were holes and SO 4 •− in S/TiO 2 -PMS system subjected to simulated sunlight. It was demonstrated that the polarization electric field of the schorl enhanced the separation efficiency of the photoinduced electrons and holes for improving the performance of the S/TiO 2 -PMS. On the other hand, the transformations of Fe 3+ and Fe 2+ on the schorl surface further promotes the activation of PMS. This work provides a new choice for designing TiO 2 -based photocatalytic persulfate activation system targeting the field of advanced oxidation water treatment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 149
·期 7
·2004-2014
·
IF 2.372
Wang Jian,Zhao Hainan,Liu Xiaolong,Xu Wenqing,Guo Yangyang,Song Jianfei,Zhu Tingyu
In this work, we presented a detailed evaluation of Ru/TiO 2 (P25) catalysts for the catalytic oxidation of (chloro)-aromatics. The model catalysts were synthesized through wet impregnation. Catalytic evaluations, as well as ICP, BET, XRD and TEM analyses, were conducted. The results indicated that RuO 2 tended to be distributed on the rutile phase of TiO 2 , leading to an inhomogeneous distribution. These Ru/TiO 2 catalysts were very active, especially for chlorobenzene oxidation. The conversions of benzene and chlorobenzene were both suppressed by the introduction of additional water. But the amount of polychlorinated benzenes as by-products was also reduced. However, the activity of the catalyst significantly decreased with an increase in calcination temperature, suggesting that the thermal stability of the catalyst still needed to be improved. Graphical Abstract
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）