ACS Applied Energy Materials
·
2020
·
IF 4.473
Weiqing Liu,Haiyan Jiang,Jing Shi,Bingjun Lu,Hongfeng Cai,Zhimin Mao,Fantai Kong
The photoanode of a dye-sensitized solar cell is composed of titanium dioxide and a dye adsorbed on the surface. Dye molecules, such as N719 dye, usually agglomerate due to H bond and other factors, forming a multilayer adsorption structure, leading to light loss and electron injection loss. Adding a co-adsorbent to the dye, such as chenodeoxycholic acid (CDCA) molecule, is an effective method to prevent the aggregation of the dye. However, the mechanism of interaction between CDCA and N719 is still unclear. Therefore, in this paper, the mechanism of interaction of CDCA and N719 was studied in detail using quartz crystal microbalance (QCM) combined with UV–vis absorption spectrum. The adsorption kinetics constant of the co-adsorbent CDCA was obtained, and it was found that the adsorption process of CDCA on the surface of TiO2 was more consistent with the Freundlich isothermal adsorption model. Under the condition of continuous adsorption and desorption, the dynamic constants of CDCA adsorption did not change obviously, but molecular rearrangement might occur. In the process of sequential competitive adsorption, pretreatment with CDCA had a small influence on the adsorption kinetic constants of N719. There is competitive adsorption between CDCA and N719 on the surface of TiO2. In the process of mixed adsorption, the interaction mechanism between CDCA and N719 is a cooperative mechanism in the solution and competitive mechanism on the TiO2 surface. In addition, the results of this experiment also showed that CDCA could accelerate the adsorption time of N719. The experimental results in this paper may be helpful for understanding the mechanism of CDCA.
研究领域:
材料科学
·
光化学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 71
·43290-43298
·
IF 3.119
Xinxin Wang,Xiuhua Hang,Altan Bolag,Wu Yun,Tana Bao,Jun Ning,Hexig Alata,Tegus Ojiyed
Aiming to explore the relationship between the molecular structure and photovoltaic performance, three pyran isomer dyes DO, DM and DP were synthesized and applied as a co-sensitizer with N719 dye in dye-sensitized solar cells (DSCs). These sensitizers were investigated by theoretical calculation, UV-vis absorption spectroscopy and cyclic voltammetry measurement to understand their structure, optical and electrochemical properties. The DSC devices based on N719 and the co-sensitizers were characterized using I–V tests, incident photon-to-current conversion efficiency and electrochemical impedance spectroscopy measurements. As compared to the standard N719-based DSCs, the co-sensitization system of N719 and DM with the most sterical structure exhibited an enhancement of the power conversion efficiency (PCE) by 18% from 7.60% to 8.96%. Both the short-circuit photocurrent density (Jsc) and open-circuit voltage (Voc) of the co-sensitized systems were increased resulting from the better maintained N719 dye loading amount on TiO2 as well as the prevention of dye aggregation. Co-sensitization of the DO molecule with less steric hindrance reduced the desorbed N719 dye amount by half leading to a decline of the photo-harvesting ability and photocurrent generation in DSCs.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xiangdong Cao,Jihua Tang,Chenchen Xu,Jiaqi Wang,Youfu Geng,Duo Yi,Xuejin Li,Yu Du,Xiaoqing Tian
Triethylamine (TEA) is a kind of flammable and pungent gas, which extensively exists in our daily life. It is paramount important to monitor ppb-level TEA rapidly and selectively at low temperatures. Herein, tungsten oxide hollow microspheres were successfully co-modified by different amount of Pd and N719, and were used to construct semiconductor gas sensor. TEA sensing properties were tested for the N719-Pd/WO 3 and Pd/WO 3 composites under various light illumination conditions. It is exciting to observe that the 0.3 wt% N719-Pd/WO 3 sensor exhibits excellent TEA detectability in terms of ultra-high response (1410, 50 ppm), low operating temperature (100 °C), fast response speed (25 s) and low detection limit (27 ppb) under white light illumination, which are superior to WO 3 sensors loaded with other Pd and N719 concentration as well as upon other light illumination conditions. This excellent sensing performance indicates that the proposed dual-effect improved sensitization by combining noble metal functionalization with visible light excitation offers an effective design for highly sensitive and efficient gas sensors based on wide-band gap semiconductors.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 61
·38506-38511
·
IF 3.108
Haiyong Guo,Zhen Hu,Li Zhao,Li Wan,Yadan Wu,Shimin Wang
A new strategy to improve the efficiency of dye-sensitized solar cells by using the external near-infrared light harvesting and light-scattering dual-functional upconversion (UC) material NaLuF4:Yb3+/Er3+ is proposed. The photoluminescence spectra of NaLuF4:Yb3+/Er3+ showed the emission of green and red light, and these luminescence bands coincided well with the absorption wavelength of N719 dye. A small amount of UC material could serve as a good scattering material in photoelectrodes. The photoelectric conversion efficiency reaches 7.58% at a concentration of 5 wt% of UC (weight ratio of UC to TiO2), which is 27.18% higher than that of P25 photoanode (5.96%) with similar thickness. This finding may be attributed to the UC luminescence and light scattering properties of the UC material.
研究领域:
材料科学
·
光伏技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Shen-wei Bai,Hui Mei,Lai-fei Cheng
In this article, we report an ultra-thin shell of MoS 2 (3–7 nm) deposited on Ag nanowires (AgNWs) to form a core-shell hybrid system by the sol-gol method. Since AgNWs is easy to be oxidized, a protection shell is necessary. Compared with commonly used hydrothermal method for MoS 2 , it could produce a more thinner and homogeneous shell with the least 3 nm thickness of MoS 2 shell, which is a breaking-through of making MoS 2 shell based on noble nanoparticles . Results show that the obtained hybrid system has great value on surface-enhanced Raman spectroscopy (SERS) due to surface plasmon resonance (SPR) effect of Ag nanowires. Ultra-thin MoS 2 shell was suitable for protecting AgNWs and simultaneously had excellent SERS signature, and this effect was rare for MoS 2 shells. By decreasing the thickness of MoS 2 film from 7 to 3 nm, the intensity of SERS signal could be enhanced. It was observed that the microstructure of this AgNWs@MoS 2 system consist of crystal AgNWs surrounded by crystal MoS 2 . AgNWs@MoS 2 showed excellent SERS effect with Rhodamine 6G (R6G) and N719 dyes, the detection limit could reach to 10 −5 M. Finally for comparison, local electromagnetic field enhancement of AgNWs@SiO 2 was also simulated to indicate AgNWs@MoS 2 better.
研究领域:
材料科学
·
纳米技术
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 23
·2001557
·
IF 16.836
Xiaoqing Yang,Yonghui Chen,Pengyun Liu,Huimin Xiang,Wei Wang,Ran Ran,Wei Zhou,Zongping Shao
Perovskite solar cells (PSCs) are highly promising next-generation photovoltaic devices because of the cheap raw materials, ideal band gap of ≈1.5 eV, broad absorption range, and high absorption coefficient. Although lead-based inorganic-organic PSC has achieved the highest power conversion efficiency (PCE) of 25.2%, the toxic nature of lead and poor stability strongly limits the commercialization. Lead-free inorganic PSCs are potential alternatives to toxic and unstable organic-inorganic PSCs. Particularly, double-perovskite Cs 2 AgBiBr 6 -based PSC has received interests for its all inorganic and lead-free features. However, the PCE is limited by the inherent and extrinsic defects of Cs 2 AgBiBr 6 films. Herein, an effective and facile strategy is reported for improving the PCE and stability by introducing an N719 dye interlayer, which plays multifunctional roles such as broadening the absorption spectrum, suppressing the charge carrier recombination, accelerating the hole extraction, and constructing an appropriate energy level alignment. Consequently, the optimizing cell delivers an outstanding PCE of 2.84%, much improved as compared with other Cs 2 AgBiBr 6 -based PSCs reported so far in the literature. Moreover, the N719 interlayer greatly enhances the stability of PSCs under ambient conditions. This work highlights a useful strategy to boost the PCE and stability of lead-free Cs 2 AgBiBr 6 -based PSCs simultaneously, accelerating the commercialization of PSC technology.
研究领域:
光伏技术
·
材料科学
·
可再生能源
·
半导体器件
·
无机化学
✓ 已验证
DOI
高影响因子
Russian Journal of Physical Chemistry A
·
2018
·Vol. 92
·期 6
·1224-1228
·
IF 0.549
Sun Yunfei,Liu Chunling,Yang Lili,Wei Maobin,Lv Shiquan,Sui Yingrui,Cao Jian,Chen Gang,Yang Jinghai
ZnO NRAs are grown on ITO substrates by a simple chemical method. CdS QDs were deposited on ZnO NRAs by SILAR. N719 was synthesized by dipping method. J–V analysis indicates that by inserting a layer of CdS QDs, the conversion efficiency of DSSCs was improved obviously. The device with CdS QDs shows the higher conversion efficiency due to the three reasons: (1) CdS QDs enhanced adsorption spectra of DSSCs in the visible region; (2) CdS QDs block the formation of Zn 2+ /dye complex, it is beneficial for electros transport from dye to ZnO photoanode. It is the key to obtain higher conversion efficiency; (3) FRET dynamics exists by the introduction of CdS QDs.
研究领域:
材料科学
·
太阳能
·
纳米技术
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Energy
·
2023
·
IF 9.3
Tianxiang Yang,Sining Yun,Chen Wang,Yongwei Zhang,Jiaoe Dang,Guangping Yang,Zan Gao,Dan Qiao,Mengmeng Zhang
Designing cost-effective counter electrode (CE) catalysts with advanced nanostructures and exploring their application in different dye-electrolyte systems is crucial for the development of dye-sensitized solar cells (DSSCs). In this work, two types of 3D network bio-based porous carbon (3D-BPC) loaded 0D niobium-based bimetallic oxide nanohybrids (CoNb 2 O 6 /3D-BPC and NiNb 2 O 6 /3D-BPC) were synthesized using a hierarchical strategy. Benefiting from the optimization of the electron transport pathways and enrichment of catalytically active sites via the hierarchical 0D/3D structure, formed by 3D-BPC and MNb 2 O 6 (M = Co, Ni), the catalytic reduction ability of MNb 2 O 6 /3D-BPC was significantly enhanced. To explore the photovoltaic performance of the MNb 2 O 6 /3D-BPC based DSSC, the I 3 − /I − electrolyte and N719 dye system and the Cu 2+ /Cu + electrolyte and Y123 dye system were simultaneously employed. The solar cells assembled with the CoNb 2 O 6 /3D-BPC and NiNb 2 O 6 /3D-BPC CE exhibited device efficiencies of 7.03% and 7.14% in the N719-I 3 − /I − system, respectively, and 1.84% and 2.42% in the Y123-Cu 2+ /Cu + system, respectively, which were almost equal to those of Pt under the same system. Additionally, MNb 2 O 6 /3D-BPC catalysts exhibited promising stability in I 3 − /I − electrolyte. This work provides guidance for the construction of low-cost and high-efficiency nanohybrid catalysts for new energy conversion devices.
研究领域:
材料科学
·
能源转换技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2023
·
IF 12.8
Xing Wang,Mengjun liang,Jiancong Zhang,Xuncai Chen,Mono Zaw,Than Zaw Oo,Nyein Wint Lwin,Su Htike Aung,Yuan Chen,Fuming Chen
High energy consumption and low salt removal rate are key barriers to realizing practical electrochemical seawater desalination processes. Here, we demonstrate a novel solar-driven redox flow desalination device with double photoelectrodes to achieve efficient desalination without electrical energy consumption. The device consists of three parts: one photoanode unit, one photocathode unit, and one redox flow desalination unit sandwiched between the two photoelectrode units. The photoelectrode units include a TiO 2 photoanode and a NiO photocathode sensitized with N719 dye, triiodide/iodide redox electrolyte, and graphite paper integrated electrodes decorated with 3,4-ethylene-dioxythiophene. Two salt feeds are located between two ferro/ferricyanide redox flow chambers. Under light illumination, high-quality freshwater is obtained from brackish water containing different concentrations of NaCl from 1000 to 12,000 ppm with a high NaCl removal rate. The device can work in multiple desalination cycles without significant performance declines. Furthermore, natural seawater with an ionic conductivity of 53.45 mS cm −1 is desalinated to freshwater. This new design opens opportunities to realize efficient and practical solar-driven desalination processes.
研究领域:
环境科学
·
材料科学
·
化学工程
·
太阳能
✓ 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）