APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
·
IF 11.698
Hongwen Zhang,Lei Ma,Jintao Ming,Bingqian Liu,Yibo Zhao,Yidong Hou,Zhengxin Ding,Chao Xu,Zizhong Zhang,Jinlin Long
This work demonstrated the 12 fold-enhanced solar water splitting over the type-II core-shell nanostructured TiO 2 rutile photoanodes by orienting the charge flow and accelerating the hole transport to water-oxidation sites. Such nanoheterostructured photoanodes were designed rationally and prepared by a facile strategy to enwrapping an amorphous Ta 2 O x N y layer on surface of TiO 2 nanorods grown on the FTO glass substrates, consequently the incident photon-to-current conversion efficiency was increased from 2.2% to 22.6% in a two-electrode system under 390 nm light irradiation. The activity results showed that under AM 1.5 G illumination, the photocurrent output of TiO 2 @Ta 2 O x N y photoanodes reached a stable density of 1.32 mA cm −2 at 1.23 V vs RHE, and which is 12 times and ca. 4.3 times than that of the pristine TiO 2 and TiO 2 @Ta 2 O 5 counterparts, respectively. Correspondingly, the oxygen evolution rate was improved from 20.3 to 112.7 mmol m −2 h −1 . A solar-to-chemical energy conversion efficiency of ca. 1.49% was achieved at 1.23 V vs RHE.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2015
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IF 2.999
Mingxuan Sun,Yalin Fang,Ying Wang,Shanfu Sun,Jia He,Zhi Yan
A ternary composite of Cu 2 O, graphene and rutile TiO 2 nanorods was prepared using Cu(CH 3 COO) 2 ·H 2 O, graphene oxide and TiCl 4 as the starting materials and its enhanced photocatalytic performance was demonstrated. Graphene/TiO 2 nanorod composites (GT) were obtained by a simple hydrothermal method and then, Cu 2 O was coupled onto the surface of graphene/rutile TiO 2 to form Cu 2 O/graphene/rutile TiO 2 nanorod (CGT) composites via a chemical bath deposition process. The as-prepared sample was characterized by X-ray diffraction (XRD), emission field scanning electron microscope (FE-SEM), transmission electron microscopy (TEM), specific surface area analyzer (BET), Raman spectroscopy and ultraviolet–visible diffuse reflectance spectroscopy (UV–vis DRS). It is found that the introduction of graphene and Cu 2 O has little effect on the morphology of TiO 2 nanorods with average dimensions of 140 nm (length) × 30 nm (diameter) (L/D ratio ≈5). A red shift of light absorption edge and more absorption in the visible light region were observed for the resulted ternary samples compared with TiO 2 and graphene/TiO 2 composites. The photocatalytic activity was evaluated by the photodegradation of methylene blue under visible light irradiation, which showed 2.8 times corresponding enhancement of the degradation efficiency for the ternary composites compared with TiO 2 . This work provides a new strategy to improve the visible light response of TiO 2 and facilitate its application in environmental remediation.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
N’dri Dieudonné Diby,Yueqin Duan,Patrick Atheba Grah,Fengshi Cai,Zhihao Yuan
In the photoelectrochemical (PEC) water splitting for the hydrogen production, the fabrication of a stable and efficient photocatalyst semiconductor remains a challenge. CdS, which is one of most used chalcogenide materials, coupled with metal oxide semiconductor exhibit a generally low durability. TiO 2 nanorods arrays (TNR) sensitized with CdS were synthesized via hydrothermal method and denoted as TNR-CdS. CdS deposition on TNR surface was controlled by regulating the hydrothermal reaction time. The samples were characterized by X-ray diffraction, Raman spectroscopy , scanning electronmicroscopy, X-ray photoelectron spectroscopy, and UV-visible absorption. A high PEC performance as well as a great CdS sensitized TNR photoanodes stability were exhibited. These results could be due to the intimate contact between CdS and TNR, favoring a fast separation of photogenerated charge carriers. The optimal PEC performance was achieved when CdS was deposited on TNR for 10 h. Under AM 1.5G illumination at applied potential of 0 V vs Ag/AgCl, TNR-CdS (10 h) is found to have a photocurrent density of 6.5 mA/cm 2 against 2.25 mA/cm 2 for TNR. Additionally, TNR-CdS (10 h) presented a photoconversion efficiency of 2.5% at −0.4 V vs Ag/AgCl, while that of TNR was 0.9% at-0.35 V vs Ag/AgCl. TNR-CdS showed great stability with and without sacrificial reagent. These results were confirmed by electrochemical impedance spectroscopy measurements, where the rapid transfer/transport and separation of photogenerated charge carriers were highlighted.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2015
·Vol. 8
·期 12
·4061-4071
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IF 7.01
Zhao Zhao,Zhang Xiaoyan,Zhang Guoqiang,Liu Zhenyu,Qu Dan,Miao Xiang,Feng Pingyun,Sun Zaicheng
To further understand the effect of structural defects on the electrochemical and photocatalytic properties of TiO 2 , two synthetic approaches based on hydrothermal synthesis and post-synthetic chemical reduction to achieve oxygen defectimplantation were developed herein. These approaches led to the formation of TiO 2 nanorods with uniformly distributed defects in either the bulk or on the surface, or the combination of both, in the formed TiO 2 nanorods (NRs). Both approaches utilize unique TiN nanoparticles as the reaction precursor. Electron microscopy and Brunauer-Emmett-Teller (BET) analyses indicate that all the studied samples exhibit similar morphology and similar specific surface areas. X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) data confirm the existence of oxygen defects (VO). The photocatalytic properties of TiO 2 with different types of implanted VO were evaluated based on photocatalytic H 2 production. By optimizing the concentration of VO among the TiO 2 NRs subjected to different treatments, significantly higher photocatalytic activities than that of the stoichiometric TiO 2 NRs was achieved. The incident photon-to-current efficiency (IPCE) data indicate that the enhanced photocatalytic activity arises mainly from defect-assisted charge separation, which implies that photo-generated electrons or holes can be captured by VO and suppress the charge recombination process. The results show that the defective TiO 2 obtained by combining the two approaches exhibits the greatest photocatalytic activity enhancement among all the samples.
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
MATERIALS LETTERS
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2021
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IF 3.423
Hong Wang,Zhongying Liu,Yihai Zhou,Renchun Yang
In this paper, P O was grafted on the surface of rutile TiO 2 by one-step hydrothermal method . Due to the presence of the highly electronegative oxygen element, the surface of TiO 2 often presented an electron-deficient state, which limited its application in reduction reactions. Herein, the low electronegativity element P from the phosphate was grafted on the surface of TiO 2 to form a P O structure, which changes the electronic equilibrium state of the TiO 2 and provide a new channel for electron migration. The surface of TiO 2 presented an electron-enrich structure, which promoted the best hydrogen production performance around 28 mmol·g −1 ·h −1 on TiO 2 -P-0.01.
研究领域:
材料科学
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纳米技术
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光催化
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
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2024
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IF 5.4
Huan Liu,Ziyue Wang,Yicheng Peng,Jiyang Xie,Wanbiao Hu
Introducing high dielectric-constant inorganic fillers into a high-broaden-strength polymer matrix is a crucial strategy to achieve a high-performance energy storage polymer composite. However, the interfacial coupling between the inorganic fillers and polymer matrix has always been a predicament for optimal performance. Herein, a multilayer interface structure, i.e., TiO2/SiO2, SiO2/polydopamine (PDA), and PDA/PVDF, are developed to resist the applied high electric field and improve the interfacial polarization simultaneously. TiO2 nanorods (NRs) with [001]-oriented rutile polymorph are synthesized by sodium dodecyl sulfate (SDS) assisted hydrothermal reaction, which is further decorated with a SiO2 layer and a subsequent PDA layer in order to incorporate well into the PVDF matrix using a solution casting process, finally forming the TiO2@SiO2@PDA/PVDF composite film. The optimal composite film incorporating [001]-TiO2 NRs exhibits an ultrahigh energy density (Ue) of 29.8 J/cm3 at a high Eb of 532 MV/m, sharply superior to the TiO2 counterpart-based films (e.g., TiO2 nanoparticle (NPs) based, and with or without the SiO2/PDA layer, which only gives a maximum Ue of 16 J/cm3 in TiO2@SiO2@PDA NPs/PVDF), and also the similarly inorganic-polymer systems previously reported. This work not only demonstrates an inorganic-polymer hybrid composite film with high electrostatic storage density but also highlights a multilayer interface structure route to alter interfacial microstructures and achieve superior energy storage performance.
研究领域:
材料科学
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能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2019
·Vol. 23
·期 11
·3031-3041
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IF 2.531
Deng Yafeng,Ma Zhanhong,Ren Fengzhang,Wang Guangxin
In spite of the TiO 2 compact layer (TCL) being widely used, it still needs more study. This paper took Ni-doped TCLs as the research target, using an innovative two-step method perfectly prepared Ni-doped TCLs with different thicknesses. And then on the basis of Ni-doped TCLs, the TiO 2 nanorod array (TNA) films were successfully prepared. The effects of Ni-doped TCLs with different thicknesses on the morphology, structure, and photoelectric performance of TNA films were investigated. The results indicated that Ni-doped TCLs with appropriate thickness can significantly improve performance of TNA films and obtain satisfactory PCE stability with time. Compared with the TNA films based on Ni:TCL5, Ni:TCL10, and Ni:TCL30, the TNA film with Ni:TCL20 exhibited better comprehensive photoelectric performance, the DSSCs based on this TNA film achieved the highest J sc (10.191 mA cm −2 ), V oc (0.574 V), PCE (4.42%), and the most excellent PCE stability with time.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 5
·2049
·
IF 3.4
Zhanjun Chen,Tao Wang,Xianglin Yang,Yangxi Peng,Hongbin Zhong,Chuanyue Hu
The thermal stability of the polyethylene (PE) separator is of utmost importance for the safety of lithium-ion batteries. Although the surface coating of PE separator with oxide nanoparticles can improve thermal stability, some serious problems still exist, such as micropore blockage, easy detaching, and introduction of excessive inert substances, which negatively affects the power density, energy density, and safety performance of the battery. In this paper, TiO2nanorods are used to modify the surface of the PE separator, and multiple analytical techniques (e.g., SEM, DSC, EIS, and LSV) are utilized to investigate the effect of coating amount on the physicochemical properties of the PE separator. The results show that the thermal stability, mechanical properties, and electrochemical properties of the PE separator can be effectively improved via surface coating with TiO2nanorods, but the degree of improvement is not directly proportional to the coating amount due to the fact that the forces inhibiting micropore deformation (mechanical stretching or thermal contraction) are derived from the interaction of TiO2nanorods directly “bridging” with the microporous skeleton rather than those indirectly “glued” with the microporous skeleton. Conversely, the introduction of excessive inert coating material could reduce the ionic conductivity, increase the interfacial impedance, and lower the energy density of the battery. The experimental results show that the ceramic separator with a coating amount of ~0.6 mg/cm2TiO2nanorods has well-balanced performances: its thermal shrinkage rate is 4.5%, the capacity retention assembled with this separator was 57.1% under 7 C/0.2 C and 82.6% after 100 cycles, respectively. This research may provide a novel approach to overcoming the common disadvantages of current surface-coated separators.Keywords:TiO2nanorods;polyethylene;ceramic separator;lithium ion batteries;thermal stability
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
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2015
·Vol. 5
·期 124
·102868-102876
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IF 3.84
Xiaodong Gu,Nuo Yu,Lisha Zhang,Jianmao Yang,Junqing Hu,Zhigang Chen
Semiconductor photocatalysis technology has great potential to become one of the most promising solutions for energy shortages and environmental pollution, and a prerequisite for the photocatalytic application is to obtain efficient, easily recyclable and large-area photocatalysts with nanostructures. In the present work, we have prepared TiO2 nanorod bundles on carbon fibers as flexible and weaveable photocatalyst/photoelectrode. The growth of TiO2 nanorod bundles is realized by using a dip-coating and hydrothermal growth method. TiO2 nanorod-bundles exhibit square-column appearance with size of about 340–400 nm and length of ∼6 μm, and they are in fact composed of small nanorods with diameters of ∼30 nm. Subsequently, 16 bunches of CFs with TiO2 nanorod bundles can be weaved to be a macroscale CFs/TiO2 cloth (weight: 0.2 g, total area: ∼35 cm2) with excellent conductivity and flexibility. With CFs/TiO2 cloth as the working electrode, photoelectrochemical measurements demonstrate that the separation of photo-induced charge carriers can be improved by increasing the applied voltage bias. Furthermore, under the illumination of simulated solar light, CFs/TiO2 cloth can degrade 94.0% Rhodamine B (RhB) in 100 min by photoelectrocatalytic degradation process (bias: 0.6 V vs. SCE), which is higher than the efficiency from single photocatalysis (60.8% RhB) or electrocatalysis (5.6% RhB) process. In addition, CFs/TiO2 cloth can be easily recycled with good performance stability. Therefore, this kind of CFs/TiO2 cloth can be used as a promising, easily recyclable and large-area photocatalyst/photoelectrode in practical application (such as degrading organic pollutants in lake and/or river). More importantly, this work provides some insights into the design of efficient and macroscale photocatalyst/photoelectrode with other nanosized semiconductor for enhancing visible-light-driven photocatalytic activity.
研究领域:
材料科学
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环境科学
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能源科学
✓ 已验证
DOI
高影响因子
Journal of Nanomaterials
·
2012
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IF 1.376
Yitan Li,Lin Wei,Ruizi Zhang,Yanxue Chen,Jun Jiao
Large area rutile TiO2 nanorod arrays were grown on F:SnO2 (FTO) conductive glass using a hydrothermal method at low temperature. CdSe quantum dots (QDs) were deposited onto single-crystalline TiO2 nanorod arrays by a chemical bath deposition (CBD) method to make a photoelectrode. The solar cell was assembled using a CdSe-TiO2 nanostructure as the photoanode and polysulfide solution as the electrolyte. The annealing effect on optical and photovoltaic properties of CdSe quantum-dots-sensitized TiO2 nanorod solar cells was studied systematically. A significant change of the morphology and a regular red shift of band gap of CdSe nanoparticles were observed after annealing treatment. At the same time, an improved photovoltaic performance was obtained for quantum-dots-sensitized solar cell using the annealed CdSe-TiO2 nanostructure electrode. The power conversion efficiency improved from 0.59% to 1.45% as a consequence of the annealing effect. This improvement can be explained by considering the changes in the morphology, the crystalline quality, and the optical properties caused by annealing treatment.
研究领域:
材料科学
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光伏技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2024
·
IF 8.1
Jianglin Tu,Jinwang Li,Zhefei Pan,Xun Zhu,Dingding Ye,Yang Yang,Hong Wang,Liang An,Rong Chen,Qiang Liao
Photoelectrochemical water splitting represents a promising route for converting solar energy into hydrogen, but sluggish reaction kinetics associated with inefficient charge separation and migration, and poor stability limit solar-to-hydrogen conversion. In this work, we develop a N-doped-CdS/TiO 2 -nanorods heterojunction photoanode for photoelectrochemical water splitting by anchoring CdS on TiO 2 nanorods followed by nitrogen doping. The light harvesting is significantly enhanced and the charge separation and migration are promoted due to the formed heterojunction and nitrogen doping, which greatly enhances the water oxidation reaction. As a result, the photoelectrochemical cell with the optimized N-doped-CdS/TiO 2 -nanorods heterojunction photoanode yields a hydrogen production rate of 42.6 μmol cm −2 h −1 , which is 2.51 times higher than that of the TiO 2 -nanorods photoanode. In particular, doping nitrogen atoms into CdS greatly alleviates the photocorrosion problem. Therefore, the newly-developed photoanode exhibits excellent stability under a continuous 10-h running.
研究领域:
材料科学
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能源转换技术
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2012
·
IF 0
Chenbo Wang,Zifei Jiang,Lin Wei,Yanxue Chen,Jun Jiao,Micah Eastman,Hong Liu
We combine CdS semiconductor quantum dots and single-crystalline rutile TiO 2 nanorod arrays to produce a practical quantum dot sensitized solar cell . A facile wet-chemical approach was implemented for growth of this CdS@TiO 2 architecture. Rutile TiO 2 nanorod arrays with lengths of 1–2 μm and diameters of 40–60 nm were synthesized on fluorine-doped tin oxide glass by a hydrothermal process in a titanium tetrachloride precursor solution . CdS quantum dots with a size of 5–10 nm were deposited onto a TiO 2 nanorod surface using an ultrasonic-assisted chemical bath deposition method . The resulting CdS quantum dots and TiO 2 nanorods formed a type-II heterojunction and showed increased absorption over visible light range. Incident photon-to-current conversion efficiencies (IPCE) as high as 85% and power conversion efficiencies of 2.54% were obtained using a polysulfide electrolyte.
研究领域:
材料科学
·
纳米技术
·
光伏技术
✓ 已验证
DOI
危险品化学品经营许可证（带存储）