Soft Matter
·
2018
·Vol. 14
·期 8
·1427-1433
·
IF 3.709
Zhichao Xu,Yaying Hong,Mengying Zhang,Jinbo Wu,Weijia Wen
Giant electrorheological (GER) fluids exhibit a high yield stress due to saturation surface polarization from contact between neighboring particles. To fine-tune the competitive performance of GER fluids, we modified the surface of the GER particles by adding silicone polyether, which strongly adsorbed at the solid–liquid interface and significantly influenced the dispersion, GER effect and electrical current density of the GER fluid. We discovered that a small amount of silicone polyether could improve the dispersion and reduce the electrical current density of the fluid. However, the steric hindrance effect suppressed the GER performance. Ultimately, an optimal solution was obtained by making tradeoffs among the dispersion, current density, viscosity, anti-sedimentation and ER effect. These tradeoffs were effective because they provided repetitive stability and wide opportunities for industrial usage.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
PubMed
高影响因子
ANALYST
·
2013
·Vol. 139
·期 5
·1016-1022
·
IF 3.969
Jiarun Tu,Wensheng Cai,Xueguang Shao
Enhancing the sensitivity of analytical methods by improving the signal quality is a universal goal in analytical chemistry. In analytical electrochemistry systems, the double layer charging current has been an obstacle to the accurate measurement of the faradaic current despite theoretical and experimental efforts. In this study, a method for sensitivity enhancement for potential step voltammetry is developed using chemometric resolution. Trilinear decomposition is used to extract the net faradaic current and double layer charging current directly from the data matrix of the decaying curves measured at different potentials. The feasibility of the method is proven using simulated data and further validated by two experimental datasets of diffusion and adsorption control reactions. Compared with the conventional approach that records the current data at a later pulse time, the voltammogram of the extracted net faradaic current is an ideal sigmoid curve with a horizontal baseline, even for the samples of very low concentration. More importantly, the analytical sensitivity can be greatly improved when the net faradaic current is used for quantitative determination.
研究领域:
分析化学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2014
·
IF 2.726
Pin Lv,Wuyou Fu,Yannan Mu,Hairui Sun,Shi Su,Yanli Chen,Huizhen Yao,Dong Ding,Tie Liu,Jun Wang,Haibin Yang
TiO 2 film materials have very wide applications in photovoltaic conversion techniques. And, TiO 2 nanotubes array film with nanowires directly formed on top (denoted as TiO 2 NTWs) was prepared by the anodization method. CdS and PbS quantum dots (QDs) were firstly cosensitized on the TiO 2 NTWs array (denoted as (CdS + PbS)/TiO 2 NTWs) by novel successive ionic layer adsorption and reaction (N-SILAR), which only needed a cation mixed solution containing Cd 2+ and Pb 2+ and an anionic solution containing S 2− . This N-SILAR method can not only effectively shorten the experimental time, simplify the experiment procedure and reduce the experiment cost, but also make the material of (CdS + PbS)/TiO 2 NTWs possess the advantages of improving electron transport and reducing chemical erosion. Moreover, the photocurrent of (CdS + PbS)/TiO 2 NTWs was 4.1 mA/cm 2 under an illumination of 100 mW/cm 2 . The most eye-popping part was that the result was 8 times higher than that of the bare TiO 2 NTWs array. The result of photoelectrochemical measurements indicated that this novel material had a potential application in photovoltaic devices.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 51
·1904461
·
IF 15.621
Junpeng Zeng,Cuifang Meng,Xiaoming Li,Ye Wu,Shuting Liu,Hai Zhou,Hao Wang,Haibo Zeng
Inorganic halide perovskite (HP)-based photodetectors (PDs) have exhibited fast response speed and high responsivity, but with low detectivity due to the high dark current of devices. Additionally, the intrinsic instability of HPs and interface deterioration originating from ion migration inhibit their practical applications severely. A tunneling organic layer is introduced to solve both these problems. Light-induced charge carriers can flow across the interfacial (poly(methyl methacrylate), PMMA) layer with appropriate thickness via the Fowler–Nordheim tunneling effect. Due to the effective control of dark current, the photo-/dark-current ratio reaches a giant value of 2.13 × 10 8 , and the peak detectivity is as high as 1.24 × 10 13 Jones. With such superiority, light signal as weak as 244 pW is accurately imaged by a PD array. Additionally, the hydrophobic organic layer inhibits the destruction of HPs caused by moisture and ion migration induced interface reaction, and negligible response attenuation is observed during continuous work in a humid environment for 48 h. This heterojunction structure design provides a new strategy to enhance the performance and stability of perovskite-based photoelectric and photovoltaic devices.
研究领域:
材料科学
·
光电技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Neway Belachew,Qitao Liu,Weilong Qin,Muhammad Bilal Akbar,Jing Gao,Hao Wang,Jiabo Le,Qinglu Liu,Yongbo Kuang
Photoelectrochemical (PEC) water splitting holds promise as a major source of sustainable energy production in the future. However, stable photoelectrodes for long-term use, particularly in harsh environments, remain challenging for large-scale PEC applications. Herein, this study reports facile, rapid, and scalable deposition of two-dimensional (2D) In2Se3 protection layers to improve the photoelectrochemical performance and stability at pH 12.3 and pH 13, where bismuth vanadate (BiVO4) is typically unstable. BiVO4/In2Se3 achieves a photocurrent density of 12.38 mA cm−2 at 1.23 V vs. reverse hydrogen electrode (RHE) under 455 nm (39 mW cm−2) LED light illumination at pH 12.3. The suitable energy alignment of In2Se3 boosts hole extraction from BiVO4 and prolongs the lifetime of holes before recombination. The photoelectrochemical stability tests reveal that the In2Se3-protected BiVO4 achieved over 40 h stability at pH 12.3. Studies on the corrosion mechanism of BiVO4/In2Se3 show that the oxidation of In2Se3 by the hole accumulation at the surface destabilizes its lattice structure, which impedes the formation of chemically stable In2Se3 in the given chemical environment. Therefore, a catalyst layer or a fast-kinetics reaction medium is required to utilize the accumulated holes at the surface, which enables the long-term use of protective layers in alkaline environments.
研究领域:
材料科学
·
能源科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nature Synthesis
·
2025
·
IF 20
Chen Hao,Zhao Yumeng,Zhang Xinyue,Li Rui,Wang Aoxuan,Zhang Haiming,Liu Junxiang,Wen Bohua,Zhang Lan,Hua Qingsong,Liu Tongchao,Wu Kai,Amine Khalil,Luo Jiayan
Lithium metal is the Holy Grail anode material for high-energy-density batteries. Unfortunately, applications of Li metal anodes are restricted by their inherent propensity to form dendrites at practical current densities. Here we present an approach that directly converts commercial polycrystalline Li (poly-Li) into various monocrystalline Li metal anodes with single facets via a recrystallization technique. By elucidating the diffusive kinetic and mechanical characteristics of different Li facets, we reveal that monocrystalline Li(110) exhibits the lowest diffusion barrier of 0.02 eV, an order of magnitude lower than poly-Li’s 0.2 eV, and a 71% reduction in Young’s modulus from 9.42 GPa to 2.71 GPa. The critical current density can be raised by an order of magnitude in solid-state batteries using monocrystalline Li(110), and the cycling stability of Li metal batteries is extended fivefold. We envision that the manipulation of the crystal plane will effectively tackle the pivotal challenges in achieving high-energy-density batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Yuli Xiong,Lin Yang,Huichao He,Jing Wan,Peng Xiao,Wenlong Guo
The successive ionic layer absorption and reaction (SILAR) method has been successfully used for the thin film preparation of metal oxides. In this work, we firstly fabricate the hybrid Bi 2 MoO 6 @Bi 2 Mo 2 O 9 photoanode by a one-step SILAR method. The optimized Bi 2 MoO 6 @Bi 2 Mo 2 O 9 demonstrates a photocurrent about 0.160 mA cm −2 at 1.23 V vs. RHE, which is 3.6 and 8.0 times enhancement compared with pristine Bi 2 MoO 6 and Bi 2 Mo 2 O 9 for water oxidation . The enhanced efficiencies of charge separation and oxidation kinetics by Bi 2 MoO 6 @Bi 2 Mo 2 O 9 are 20.5% and 54.6% at 1.23 V vs. RHE, which is higher than Bi 2 Mo 2 O 9 (9.2% and 15.4%) and Bi 2 MoO 6 (10.7% and 29.2%). Moreover, the electron transport time of Bi 2 MoO 6 @Bi 2 Mo 2 O 9 is 0.038 ms at 300 W m −2 through the controlled intensity modulated photocurrent spectrometer analysis, which is lower than Bi 2 Mo 2 O 9 (0.087 ms) and Bi 2 MoO 6 (0.052 ms). The enhanced photoelectrochemical activities of Bi 2 MoO 6 @Bi 2 Mo 2 O 9 can be attributed to the matched energy band between Bi 2 Mo 2 O 9 and Bi 2 MoO 6 , which could not only improve the charge separation, but also accelerate the charge migration. Therefore, our research indicates an effective technique for fabricating Bi 2 MoO 6 @Bi 2 Mo 2 O 9 by one step process, and thus may provide a new idea for the preparation of other hybrid ternary metal oxides.
研究领域:
材料科学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
Processes
·
2024
·Vol. 12
·期 8
·1765
·
IF 2.8
Ping Lu,Zihan Zhang,Zixing Gu,Zhuo Li,Huaneng Su,Xiaozhong Shen,Qian Xu
To address the problem of suboptimal performance in deep eutectic solvents displayed by traditional TiO2photoelectrodes and Cu2O photoelectrodes that have undergone simplistic modifications that result in a mismatch with battery discharge capacity, a method combining hydrothermal and dip-coating techniques was developed to create a Fe2O3-CuO heterojunction structure on the FTO surface. Then, the impact of the heterojunction structure on the performance of solar flow batteries was investigate in this study. The experimental findings reveal that the formation of the heterojunction structure effectively mitigates the recombination rate of photogenerated carriers within the photoelectrode. Furthermore, by meticulously adjusting the CuO loading, the harmonious balance between charging and discharging currents was achieved, thereby enhancing the overall performance of the solar redox flow batteries. In comparison to standalone Fe2O3photoelectrodes, this innovative approach significantly broadens the spectrum of sunlight utilization. Notably, the fabricated Fe2O3/CuO-2 photoelectrode demonstrates a remarkable photocharging performance, far surpassing both Fe2O3photoelectrodes and commercial TiO2photoelectrodes. Specifically, the Fe2O3/CuO-2 photoelectrode boosts an average current density of 598.68 μA∙cm−2, with its charging current density being 2.74 and 5.15 larger, respectively, than that of the Fe2O3and commercial TiO2photoelectrodes.
研究领域:
材料科学
·
电化学
·
可再生能源
·
太阳能
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2024
·
IF 5.8
Guo He,Dezhi Yang,Sizhe Tao,Liqing Yang,Dechao Guo,Jingbo Zheng,Ji Li,Jiangshan Chen,Dongge Ma
Perovskite photodetectors (PPDs) offer a promising solution with low cost and high responsivity, addressing the limitations of traditional inorganic photodetectors. However, there’s still room for improvement in terms of dark current and stability of air-processed PPDs. In this study, 4',4"-Tris(carbazl-9-yl)-triphenylamine (TCTA) is utilized as nucleation agent to enhance the quality of perovskite film. The synergistic effect of TCTA and moisture promotes rapid nucleation of PbI2-PbCl2, resulting in an increased nucleation rate and the elimination of pinholes in the film. By employing additive engineering, we obtain a PbI2-PbCl2 layer with high coverage, leading to a lower density of traps in the corresponding perovskite film. Consequently, the modified PPD exhibits a remarkable reduction in dark current density by over one order of magnitude, reaching 2.4×10-10 A cm-2 at -10 mV, along with a large linear dynamic range (LDR) of 183 dB. Furthermore, the resulting PPD demonstrates remarkable stability, retaining 90% of the initial external quantum efficiency (EQE) value even after continuous operation for over 3200 hours. Due to a fast response time in nanosecond range, the PPD can convert modulated light signals into electrical signals at a speed of 588 Kbit s-1, highlighting great potential in the field of optical communication.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Fangzhou Zhou,Fangqin Zeng,Xu Liu,Fangyang Liu,Ning Song,Chang Yan,Aobo Pu,Jongsung Park,Kaiwen Sun,Xiaojing Hao
Back contact modification plays an important role in improving energy conversion efficiency of Cu2ZnSnS4 (CZTS) thin film solar cells. In this paper, an ultrathin carbon layer is introduced on molybdenum (Mo)-coated soda lime glass (SLG) prior to the deposition of CZTS precursor to improve the back contact and therefore enhance CZTS solar cell efficiency. By introducing this layer, the short circuit current (Jsc) and device conversion efficiency increase for both nonvacuum (sol–gel) and vacuum (sputtering) methods. Specifically, for the sol–gel based process, Jsc increases from 13.60 to 16.96 mA/cm2 and efficiency from 4.47% to 5.52%, while for the sputtering based process, Jsc increases from 17.50 to 20.50 mA/cm2 and efficiency from 4.10% to 5.20%. Furthermore, introduction of this layer does not lead to any deterioration of either open circuit voltage (Voc) or fill factor (FF).
研究领域:
材料科学
·
太阳能技术
·
薄膜电池研究
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 6
·3437-3446
·
IF 1.093
Niu Yakun,Zhou Yi,Niu Ping,Shen Haiyan,Ma Ying
Ti doped hematite photoanodes have been intensively investigated due to their excellent activity for photoelectrochemical water oxidation. However, little attention has been paid to the doping effect on the photocurrent onset potential of hematite and the underlying mechanism. In this
paper, Ti doped hematite nanorod arrays were successfully prepared through a facile treatment of hematite with TiCl3 solution. The photocurrent of the Ti doped hematite photoanode increases by three times, and its onset potential shifts more positively as compared with that of the
undoped one. Electrochemical analyses were employed to unravel the mechanism of anodic shift of the onset potential. Cyclic voltammograms and electrochemical impedance spectra confirmed that more surface states were formed in Ti doped hematite than the undoped one. As a result, lower activity
towards oxygen evolution reaction (OER) and increased electron–hole recombination after light on/off in low potential region were observed in Ti doped hematite. It is concluded that these doping induced surface states may be a hindrance to charge transfer and the onset potential of Ti
doped hematite shifts anodically.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SENSORS
·
2025
·Vol. 25
·期 9
·2740
·
IF 3.5
Xuefeng Huangfu,Junyu Chen,Gaohui Ge,Jianyu Li,Jiazhen Zhang,Qinhao Lin,Hao Xu,Shu Min Wang
Due to high responsivity and wide spectral sensitivity, metal halide perovskite photodiodes have a wide range of applications in the fields of visible light and near-infrared photodetection. Specific detectivity is an important quality factor for high-performance perovskite-based photodiodes, while one of the keys to achieving high detectivity is to reduce dark current. Here, 3-fluoro phenethylammonium iodide (3F-PEAI) was used to passivate the perovskite surface and form the two-dimensional (2D) perovskite on the three-dimensional (3D) perovskite surface. The as-fabricated passivated perovskite photodiodes with 2D/3D hybrid-dimensional perovskite heterojunctions showed two orders of magnitude smaller dark current, larger open circuit voltage and faster photoresponse, when compared to the control perovskite photodiodes. Meanwhile, it maintained almost identical photocurrent, achieving a high specific detectivity up to 2.4 × 1012Jones and over the visible-near-infrared broadband photodetection. Notably, the champion photoresponsivity value of 0.45 A W−1was achieved at 760 nm. It was verified that the 2D capping layers were able to suppress trap states and accelerate photocarrier collection. This work demonstrates strategic passivation of surface iodine vacancies, offering a promising pathway for developing ultrasensitive and low-power consumption photodetectors based on metal halide perovskites.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）