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
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）