JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Yong Zuo,Jinjun Chen,Haocheng Yang,Miao Zhang,Yanfen Wang,Gang He,Zhaoqi Sun
In this paper, highly ordered titanium dioxide nanorod (TNR) arrays decorated with Ag-Ag 2 S quantum-dots (QDs) were synthesized on FTO substrate through hydrothermal treatment and in-situ vulcanization . The content of Ag 2 S QDs on Ag/TNR was controlled by changing the immersion time of Ag/TNR in the N-N-dimethyl formamide (DMF) solution containing dissolved sulfur element. The morphology, structure, composition and optical, photoelectric and photocatalytic properties of QDs/TNR arrays were studied in detail. In the visible range, the QDs/TNR array with a soaking time of 12 h exhibits the maximal photocurrent density (0.082 mA/cm 2 ) and photodegradation rate (62.2%), which is 5.5 and 1.85 times higher than that of pure TNR. The improvement of these properties could be attributed to synergy effect between Ag and Ag 2 S materials. That is, Ag QDs can stably capture and transmit photo-generated electrons from the TNR surface, whereas the Ag 2 S promoter is regarded as the interface active sites to enhance photocatalytic reactions. Therefore, the synergistic effect of Ag-Ag 2 S can significantly enhance the photoelectrochemical and photocatalytic properties of the TNR arrays.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 38
·21777-21785
·
IF 3.049
Yafeng Deng,Zhanhong Ma,Fengzhang Ren,Guangxin Wang
An innovative two-step method perfectly prepared TCLs with different thicknesses, and then the TNA films based on TCLs were successfully prepared. The effects of different thicknesses of TCLs on the morphology and photoelectrochemical performance of TNA films were investigated. The results indicated that TCLs with appropriate thickness could effectively improve the morphology and photoelectrochemical performance of TNA films. Compared with the TNA films based on TCL5, TCL10 and TCL30, the TNA film based on TCL20 exhibited more ideal and comprehensive photoelectrochemical performance. Moreover, dye-sensitized solar cells (DSSCs) based on this TNA film achieved the highest Jsc (10.2054 mA cm−2), Voc (0.5737 V), PCE (3.3%) and Pout (3.31 mW cm−2).
研究领域:
材料科学
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能源科学
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光化学
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DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2022
·Vol. 169
·期 5
·056513
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IF 4.386
Jiale Deng,Juan Gao,Mei Liu,Yanfen Wang,Lingcheng Zheng,Yang Li,Yin Liu
TiO2/SnS/MoS2 ternary nanorod arrays were synthesized on a fluorine-doped tin oxide (FTO) conductive glass by a successive hydrothermal method. The morphology, microstructure, optical properties, photodegradation activity, photoelectrochemical performance, and charge transport mechanism of TiO2/SnS/MoS2 were systematically studied. It was found that SnS and MoS2 with a narrow bandgap can facilitate light absorbance of TiO2/SnS/MoS2 heterostructures across the visible range, improving the utilization of sunlight. TiO2/SnS/MoS2 exhibits the maximum photodegradation rate (61.54%) for Rhodamine B (RhB) in 60 min with a pseudo-first-order rate constant (0.0122 min−1), which is about 5.16 times better than that of TiO2. As a photoanode, TiO2/SnS/MoS2 has the highest photocurrent (0.841 mA cm−2), which is approximately 8.32 times better than those of TiO2. The enhanced photocatalytic and photoelectrochemical performance of TiO2/SnS/MoS2 is ascribed to the Z-scheme mechanism determined by the detection of active species and the synergistic effect of SnS and MoS2 co-decoration.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
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IF 3.83
Ling Wang,Koucheng Chen,Hui Tong,Ke Wang,Lu Tao,Yinxi Zhang,Xingfu Zhou
In this study, a Yb 3+ , Er 3+ co-doped TiO 2 inverted pyramid nanorod (NR) array and a compact TiO 2 film are simultaneously fabricated as the mesoporous support layer and electron-blocking layer, respectively, by a one-pot hydrothermal method . The scanning electron microscopy results show that the incorporation of Er 3+ and Yb 3+ causes changes not only in the growth rate of the NRs, but also in the TiO 2 NR morphology. The Er 3+ , Yb 3+ co-doped TiO 2 NRs exhibit an inverted pyramidal morphology, which is beneficial for perovskite permeation and light utilization. Notably, the Er 3+ , Yb 3+ co-doping causes changes in the band gap of TiO 2 and leads to 25% increase in the current density. The electrochemical impedance spectroscopy results show that the device based on the doped TiO 2 NRs has a higher recombination resistance and a lower transfer resistance than those of the undoped device, and thereby, the doped device exhibits a lower electron recombination rate. In addition, the upconversion Er and Yb co-doped device exhibits 25% higher current density and 17% higher photon-to-electron conversion efficiency, as revealed by the J-V test results. Moreover, the optimized efficiency of the TiO 2 NR array-based perovskite solar cell is determined to be 10.02%. Furthermore, the Er and Yb co-doped device exhibits a near-infrared response, an efficiency of 0.1% is achieved under infrared light (800–1100 nm) irradiation. This upconversion material can widen the photovoltaic responses of solar cells into the near-infrared region and improve the utilization of sunlight.
研究领域:
材料科学
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能源技术
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光电转换
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DOI
高影响因子
Journal of Materials Chemistry A
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2015
·Vol. 3
·期 38
·19476-19482
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IF 7.443
Jun-Feng Li,Zhen-Long Zhang,Hui-Ping Gao,Yang Zhang,Yan-Li Mao
TiO2 nanorods were synthesized by hydrothermal methods with ethanol–HCl and water–HCl solutions, respectively, and CH3NH3PbI3−xClx perovskite solar cells based on them were fabricated. The power conversion efficiency (PCE) of the best solar cells based on TiO2 nanorods with water–HCl solution is higher than that with ethanol–HCl solution. The dimensions, morphology, optical properties, and photogenerated charge behavior of the two kinds of samples were investigated. The results indicate that the better performance of solar cells based on TiO2 nanorods with water–HCl solution than those with ethanol–HCl solution could be attributed to their special orientation, high conductivity, improved morphology, good optical properties, fast charge transfer and reduced charge recombination. A PCE of 11.8% was achieved using TiO2 nanorods with water–HCl solution, which is the highest among the reported TiO2 nanorod based cells.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 25
·12944-12949
·
IF 3.708
Yamin Feng,Jianhui Zhu,Jian Jiang,Wenwu Wang,Gaoxiang Meng,Fei Wu,Yongli Gao,Xintang Huang
We herein present a useful and novel strategy to redesign photoanodes by building smart TiO2 nanorod networks in and on a film of P25 nanoparticles (NPs) to optimize the comprehensive performance of dye-sensitized solar cells (DSSCs). By using a doctor-blade method followed by a facile hydrothermal treatment, an interesting hierarchical double-layered film consisting of P25 NPs and TiO2 nanorods (NRs) was fabricated on a fluorine-doped tin oxide (FTO) substrate. In our strategy, P25 NPs (underlayer) with a large surface area can potentially enable a large amount of dye absorption while TiO2 NRs (overlayer) as the scattering part would effectively strengthen the light harvesting ability. Moreover, TiO2 NRs inserted into the P25 NP film also provide conducting networks for fast photogenerated electron transport. As demonstrated in photoanodes for DSSCs, this hierarchical double-layered photoanode indeed exhibits superior DSSC performance to that of a pure P25 NP film; the photovoltaic conversion efficiency increases up to 8.62% under illumination of one sun (AM 1.5 G, 100 mW cm−2), which is significantly better than 6.12% for the pure P25 NP photoanode. This work highlights the significance of the rational design of photoanode electrodes for enhanced energy conversion applications.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2017
·Vol. 164
·期 12
·H707
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IF 3.259
Xingzhi Wang,Zhuang Wang,Miao Zhang,Xishun Jiang,Yanfen Wang,Jianguo Lv,Gang He,Zhaoqi Sun
TiO2 nanorod (TNR) arrays have been sensitized by CdS, PbS, CdS/PbS, and PbS/CdS quantum-dots (QDs). The TNR arrays were synthesized by a hydrothermal treatment, and QDs were deposited on the arrays by a successive ionic layer adsorption and reaction (SILAR) technique. The morphology, structure, composition, optical, photoelectrochemical (PEC), and photocatalytic (PC) properties were systematically investigated. The results demonstrate that TNR/QDs can effectively facilitate photoinduced carrier transport, suppress the recombination rate of electron-hole pairs, and improve the visible light absorption, PEC, and PC properties. The TNR/CdS(7)/PbS(3) sample shows the maximal photocurrent density (0.91 mA/cm2) and photodegradation efficiency (97.3%), which is nearly 37.9 and 2.89 times higher than those of bare TNR, respectively. The enhanced properties are attributed to the narrow band gaps and high absorption coefficients of QDs, and the type-II nanoheterostructures with a staggered alignment of band edges at the hetero-interface that can facilitate the spatial separation of electron-hole pairs.
研究领域:
材料科学
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纳米技术
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光化学
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DOI
高影响因子
JOURNAL OF POWER SOURCES
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2020
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IF 8.247
Xuran Sun,Chang Liu,Peili Zhang,Lunlun Gong,Mei Wang
To assemble efficient photoelectrochemical (PEC) cells for total water splitting, the inexpensive photocathodes that are active and stable in alkaline solutions are strongly desired, as the known earth abundant catalyst-decorated photoanodes display high activity and good stability for water oxidation mostly in basic media. Herein, we report a Si-based composite photocathode with its front surface coated orderly by an N-doped graphene nanolayer (C N ) and a TiO 2 nanorod array (TiO 2(ALD/NR) ), which is loaded with Ni/Co phosphide catalyst (NiCoP) nanoparticles . The optimized Si/C N /TiO 2(ALD/NR) /NiCoP electrode exhibits a photocurrent density of −19.87 mA cm −2 at 0 V, an onset potential at 0.42 V vs RHE , and an applied bias photon-to-current efficiency of 1.28% for H 2 production in 1.0 M KOH under simulated 1 sun illumination . The impacts of TiO 2 NR array outlayer and surface-loaded NiCoP catalyst on interfacial energetics , charge transfer kinetics, and PEC performance of photocathodes are comparatively studied by using a series of reference electrodes. The results indicate that the TiO 2 NR array makes a major contribution to the evidently improved PEC activity of Si/C N /TiO 2(ALD/NR) , and that the NiCoP loaded on the surface of TiO 2 NR array greatly enhances the charge transfer efficiency and boosts HER kinetics of the photocathode.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
MICROCHIMICA ACTA
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2018
·Vol. 185
·期 3
·1-10
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IF 5.705
Wang Yan,Bian Feng,Qin Xiaofei,Wang Qianqian
A visible-light driven photoelectrochemical (PEC) aptasensor is described that is capable of detecting chloramphenicol (CAP). It is based on the use of a TiO 2 based nanorod array (NRA) sensitized with Eu(III)-doped CdS quantum dots. The NRA absorbs visible-light and while strongly depressing the recombination of photogenerated charges, thereby improving photo-to-current conversion efficiency. The introduction of Eu(III) ions promotes the charge transformation and utilization, and this results in a further increase of photocurrent. The NRA was employed as the photoactive material for the fabrication of a PEC aptasensor. CAP-binding aptamers were immobilized on a fluorine-doped tin oxide (FTO) electrode that was modified with the NRA. The aptasensor was applied to the determination of CAP by monitoring the decrease in photocurrent (at a typical voltage of 0 V) that is caused by the formation of the aptamer-CAP complex. Under optimal conditions, the response is linear in the 1.0 pM to 3.0 nM CAP concentration range, with a detection limit of 0.36 pM (at S/ N = 3). The method was applied to the determination of CAP in spiked milk samples where it gave satisfactory results.
Schematic presentation of the fabrication of a visible-light driven photoelectrochemical aptasensor based on the use of a TiO 2 nanorod array sensitized with Eu(III)-doped CdS quantum dots. It was applied to the determination of chloramphenicol with good selectivity and high sensitivity. TiO 2 NRA: TiO 2 nanorod array; FTO: fluorine-doped tin oxide; CdS:Eu 3+ QDs: Eu(III)-doped CdS quantum dots; BSA: bovine serum albumin; CAP: chloramphenicol
研究领域:
分析化学
·
生物医学工程
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DOI
PubMed
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 40
·28299-28306
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IF 3.9
Jun Guo,Wei Gan,Ruixin Chen,Miao Zhang,Zhaoqi Sun
TiO2 nanorod arrays have been widely used in photocatalytic processes, but their poor visible light absorption and rapid carrier recombination limit their application. Both introducing oxygen vacancies and using precious metals as surface plasmon resonance (SPR) stimulators are effective strategies to enhance their photocatalytic performance. Herein, Au nanoparticle sensitized blue TiO2 nanorod arrays (Au/B-TiO2) were successfully fabricated for efficient Gatifloxacin photodegradation. The degradation efficiency of Gatifloxacin was up to 95.0%. Moreover, the corresponding reaction rate constant (Ka) was up to 0.02007 min−1. Additionally, it was suggested that Gatifloxacin could be subject to three different degradation pathways. The superior catalytic activity of Au/B-TiO2 is a result of the combined effect of the two components. Firstly, TiO2 nanorod arrays provide a larger surface area for Au deposition and act as efficient transfer channels. Secondly, the presence of oxygen vacancies in blue TiO2 nanorod arrays enhances the catalytic activity. Thirdly, Au acts as a SPR activator, providing a large number of high-energy electrons in the photocatalysis process. Lastly, the improved light capture capabilities are essential for efficient removal of Gatifloxacin. This work provides a new approach for the construction of a high-performance heterojunction photocatalyst in advanced oxidation processes.
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
Nanoscale Research Letters
·
2013
·Vol. 8
·期 1
·1-7
·
IF 2.524
Hu Hongwei,Ding Jianning,Zhang Shuai,Li Yan,Bai Li,Yuan Ningyi
Ag 2 S quantum dots were deposited on the surface of TiO 2 nanorod arrays by a two-step photodeposition. The prepared TiO 2 nanorod arrays as well as the Ag 2 S deposited electrodes were characterized by X-ray diffraction, scanning electron microscope, and transmission electron microscope, suggesting a large coverage of Ag 2 S quantum dots on the ordered TiO 2 nanorod arrays. UV–vis absorption spectra of Ag 2 S deposited electrodes show a broad absorption range of the visible light. The quantum dot-sensitized solar cells (QDSSCs) based on these electrodes were fabricated, and the photoelectrochemical properties were examined. A high photocurrent density of 10.25 mA/cm 2 with a conversion efficiency of 0.98% at AM 1.5 solar light of 100 mW/cm 2 was obtained with an optimal photodeposition time. The performance of the QDSSC at different incident light intensities was also investigated. The results display a better performance at a lower incident light level with a conversion efficiency of 1.25% at 47 mW/cm 2 .
研究领域:
材料科学
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能源科学
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纳米技术
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 85
·54068-54077
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IF 3.108
Wenhan Chen,Qi Luo,Xueshuang Deng,Jianfeng Zheng,Chenxi Zhang,Xiaohong Chen,Sumei Huang
The morphology of electron transport layers has a significant impact on the device architecture and electronic processes of mesoscopic perovskite solar cells (PSCs). In this study, ultrathin MgO is coated on the surface of compact TiO2 (c-TiO2). The MgO-coated c-TiO2 is first used as seeds to hydrothermally grow one-dimensional (1D) TiO2 nanorod (NR) arrays for PSC devices. Rutile nanorod arrays are fabricated via a facile solvothermal method using tetrabutyl titanate (TBT) as the Ti precursor. The microstructures and morphologies, including nanorod diameter, length, and areal density, of the TiO2 NR arrays are varied by controlling the concentration of TBT from 0.3 M to 0.7 M. Furthermore, the profound effects of the MgO modification and titania nanorod morphology on the pore-filling of perovskite CH3NH3PbI3, charge separation and recombination at the perovskite/titania nanorod interface are investigated. Our results reveal that the Ti precursor concentration strongly affects the open-circuit voltage (VOC), short-circuit current density (JSC), and fill factor (FF) of the 1D TiO2 NR array-based device. Under optimized conditions with MgO coating and at 0.4 M TBT, our champion cell with 1D TiO2 NRs demonstrates a power conversion efficiency (PCE) of 17.03% with JSC = 22.01 mA cm−2, VOC = 1.06 V, and FF = 0.73. Under the same fabrication conditions, MgO modification enhances the average PCE to 16.24% for the PSCs with the MgO coating from 13.38% for the PSCs without the MgO coating. The devices show an approximately 18% improvement in performance, which mainly results from the open-circuit voltage and fill factor enhancements. Moreover, advantageously, the MgO modification is found to reduce the current density–voltage (J–V) hysteresis with respect to the scan direction and improve the UV stability of the non-encapsulated cells. Therefore, this study presents a promising approach to fabricate efficient and stable one-dimensional TiO2 nanorod array-based perovskite solar cells.
研究领域:
材料科学
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光电子学
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能源研究
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DOI
高影响因子
危险品化学品经营许可证（带存储）