Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 9
·4513-4526
·
IF 8.867
Hongmei Li,Xing Qian,Changli Zhu,Xiancai Jiang,Li Shao,Linxi Hou
Tubular-structured nanomaterials with tailorable crystal structures and shell architectures whose properties can be tuned without changing their chemical compositions are attractive in electrochemical energy conversion and storage fields. Herein, we report the fabrication of tubular-structured orthorhombic CoSe2 (o-CoSe2) and cubic CoSe2 (c-CoSe2) by calcining monoclinic Co3Se4 nanotubes (Co3Se4 NTs) prepared by a facile precursor transformation method. Benefiting from advantageous structural features, including functional shells and well-defined interior voids, the tubular-structured o-CoSe2 showed a high power conversion efficiency of 9.34% as a counter electrode catalyst for dye-sensitized solar cells (DSSCs), superior to that of a Pt counter electrode (8.15%), under AM 1.5 G irradiation. In addition, the o-CoSe2 nanotubes also demonstrated excellent electrocatalytic activity in terms of low onset overpotential (∼54 mV) and small Tafel slope (∼65.9 mV per decade) as a hydrogen evolution reaction (HER) catalyst in alkaline medium. Hence, this work provides a promising strategy to selectively design and synthesize highly active electrocatalysts for energy conversion.
研究领域:
材料科学
·
电化学
·
能源转换与存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Saudi Chemical Society
·
2015
·
IF 2.523
Lijie Wang,Xi Zhang,Peng Zhang,Zetan Cao,Junhua Hu
Mn doped TiO 2 was synthesized by hydrothermal treatment of titanium boride and manganese chloride. The doped nano powders were fabricated by adding ammonium water into the mother solution which was obtained hydrothermally. The calcination of precursory powders took place at the temperature of 400–600 °C which resulted in the formation of anatase with a small amount of rutile phase. The shift of valence band maximum (VBM) toward the lower binding energies was observed by measuring the position of VBM with reference to the Fermi level, which contributed to the significant red-shift of absorption edges. X-ray photoelectron spectroscopy (XPS) measurement shows that manganese exists in both 4+ and 3+ valance states, which may have a temperate replacing of Ti 4+ because of the charge compensation compared with 2+ and 3+ valence states. The property of photoelectric conversion was detected by evaluating the photocurrent under visible light (>420 nm), and the fluorescence spectra also proved that 6%-Mn doped TiO 2 (DM6) shows a better photoelectric conversion performance.
研究领域:
材料科学
·
光催化
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Xiaoqing Yang,Huimin Xiang,Jianying Huang,Chuan Zhou,Ran Ran,Wei Wang,Wei Zhou,Zongping Shao
Lead-free inorganic Cs 2 AgBiBr 6 double perovskites have emerged as promising materials in perovskite solar cells (PSCs) to tackle the inferior stability and toxicity issues of organic–inorganic hybrid PSCs. However, the power conversion efficiencies (PCEs) of Cs 2 AgBiBr 6 solar cells are remarkably restricted by the intrinsic and extrinsic defects of Cs 2 AgBiBr 6 films. More specifically, the fast crystallization process in the formation of Cs 2 AgBiBr 6 films strongly prevents the homogeneous growth of perovskite crystals, leading to inferior Cs 2 AgBiBr 6 film quality. This work introduces a facile strategy to retard the crystallization of Cs 2 AgBiBr 6 perovskites by introducing Lewis base additives into the precursor solution. The incorporation of a strongly coordinated thiourea additive with a sulfur donor leads to the generation of a Lewis acid base adduct, which retards the crystallization process for Cs 2 AgBiBr 6 crystals, improves the quality of the Cs 2 AgBiBr 6 film, decreases the defect density and inhibits charge carrier recombination. After optimization, the cell delivers a superior PCE of 3.07%, surpassing that reported for most Cs 2 AgBiBr 6 -based solar cells in the literature, and exhibits outstanding stability with a PCE retention rate of 95% after 20 days of storage in air. This work provides an effective strategy for further improvements in the performance of inorganic lead-free Cs 2 AgBiBr 6 -based photovoltaic cells .
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 2
·1008-1012
·
IF 1.134
Zhao Xiao-Chong,Wu Dong-Xue,Yang Li-Jun,Tang Jun,Yue Guo-Zong,Yang Pan
Institute of Materials, Chinese Academy of Engineering Physics, Jiangyou 621908, P. R. China To improve the stability of organic–inorganic hybrid perovskite, cesium-containing methylammonium lead iodide perovskite have been synthesized by one-step solution deposition. With the
increasing of Cs+ doping concentration, direct optical band gap of perovskite was increases, while defects and roughness of perovskite thin films were gradually augmented. A certain amount of Cs+ incorporated in perovskite absorb layer could improve power conversion efficiency
through the enhancing of open circuit voltage and fill factor. However, excessive Cs+ doping concentration results in the reduced of short-circuit current and fill factor, which reduced power conversion efficiency. The optimized ratio 10% Cs+ doping achieved the highest
power conversion efficiency (16.84%).
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Huajing Fang,Liangliang Wu,Hailong Ma,Wenting Wu,Lingqi Wu,Yue Zhang,Hong Wang
Biomimetic devices as a game changer offer unprecedented possibilities in modern optical system, artificial intelligence and other frontier fields. So far, the integrated devices with both quantitative environmental perception and self-regulation abilities are still the challenges for improving the intelligent level of optoelectronic technology. Herein, we present a dual-function biomimetic eye based on the photoelectrochemical device for the first time. The rational design of the interfaces and organohydrogel electrolyte has revolutionized the functional integration of optoelectronic device. Anions and cations in the organohydrogel electrolyte are involved in photoelectric conversion and electrodeposition process respectively in different working modes. Hence, the obtained biomimetic eye can not only detect the light intensity in self-powered mode but also adjust its own light transmission according to the illumination conditions, adapting to the environment just like human eyes. Moreover, the organohydrogel electrolyte shows excellent thermal stability (−40 °C ∼ 60 °C) and a relatively wide operating voltage range, which enables the biomimetic eye to operate in harsh environments. This work possesses potential application prospects in bionic devices and provides a new route for developing multifunctional and durable photoelectrochemical devices.
研究领域:
材料科学
·
仿生学
·
光电子技术
✓ 已验证
DOI
高影响因子
ACS Nano
·
2021
·
IF 15.881
Sisi Liu,Kao Xiong,Kang Wang,Guijie Liang,Ming-Yu Li,Haodong Tang,Xiaokun Yang,Zhen Huang,Linyuan Lian,Manlin Tan,Kai Wang,Liang Gao,Haisheng Song,Daoli Zhang,Jianbo Gao,Xinzheng Lan,Jiang Tang,Jianbing Zhang
Infrared (IR) solar cells are promising devices for significantly improving the power conversion efficiency of common solar cells by harvesting the low-energy IR photons. PbSe quantum dots (QDs) are superior IR photon absorbing materials due to their strong quantum confinement and thus strong interdot electronic coupling. However, the high chemical activity of PbSe QDs leads to etching and poor passivation in ligand exchange, resulting in a high trap-state density and a high open circuit voltage (VOC) deficit. Here we develop a hybrid ligand co-passivation strategy to simultaneously passivate the Pb and Se sites; that is, halide anions passivate the Pb sites and Cd cations passivate the Se sites. The cation and anion hybrid passivation substantially improves the quality of PbSe QD solids, giving rise to an excellent trap-state control and prolonged carrier lifetime. A high VOC and a high short circuit current density (JSC) are achieved simultaneously in the IR QD solar cells based on this hybrid ligand treatment. Finally, a IR-PCE of 1.31% under the 1100-nm-filtered solar illumination is achieved in the PbSe QD solar cells, which is the highest IR-PCE for PbSe QD IR solar cells at present. Additionally, the PbSe QD devices show a high external quantum efficiency of 80% at ∼1295 nm.
研究领域:
材料科学
·
太阳能技术
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Yueli Liu,Qitao Li,Wenchao Zhang,Zifan Yang,Sijie Zhao,Wen Chen
All-inorganic CsPbI3 perovskite quantum dots (QDs) have attracted great attention since emerging as a new class of materials with superior light-harvesting properties and enhanced thermal stability compared to organic–inorganic hybrid perovskites. However, poor phase stability remains a bottleneck for practical applications. In the present work, CsPb(I1–xBrx)3 perovskite QDs are synthesized by Br doping to increase the tolerance factor for the improvement of phase stability, and the balance between the stability of solar cells and the power conversion efficiency (PCE) is considered by adjusting the Br doping content. It is found that the phase stability of CsPb(I1–xBrx)3 QDs is much improved, while their band gap increases from 1.77 to 1.89 eV when the Br doping content increases from 0 to 30%. CsPbI2.4Br0.6 QD-based perovskite solar cells (PSCs) achieve a proper balance between high PCE and stability; the PCE is 12.31%, approaching that of the CsPbI3-based PSCs (14.13%), and may retain 87% of the initial efficiency after 15 days of storage in ambient air.
研究领域:
材料科学
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 22
·13203-13211
·
IF 2.599
Zhang Li-Ying,Zhang Yong,Guan Wei-Bao,Wang Ke-Fan,Cheng Zhen-Xiang,Wang Yuan-Xu
Perovskite solar cells single-doped with Br − or Cs + ions have been proved to be an effective approach to improve their efficiency and stability. In our work, we took advantage of co-doping with Br − and Cs + . At our studied doping levels from CH 3 NH 3 I:PbI 2 :CsBr = 1:1:0 ( x = 0) to 0.85:1:0.15 ( x = 0.15), CsBr doping does not introduce any detectable impurity, and the crystal grains grow larger with increasing CsBr doping level. Furthermore, when the CsBr doping level is less than x = 0.1, it can progressively enhance the optical absorption of the perovskite film, although the absorption begins to decrease when the doping level rises above x = 0.1. X-ray photoelectron spectroscopy measurements show that Br − has successfully replaced I − and bonds with Pb 2+ after CsBr doping. At the optimized doping level of x = 0.1, the incorporation of CsBr in the reaction system can improve the morphology of perovskite films and greatly enhance the efficiency from 9.8% for undoped sample to 13.6%, better than single Br − or Cs + doping. Our result shows that CsBr doping is an effective method to enhance the efficiency of perovskite solar cells.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Huiren Zheng,Jize Wang,Junye Pan,Chunyang Zheng,Yuxin Zhang,Ankang Shu,Bin Li,Shaowen Cao,Yong Peng
Underwater photovoltaics plays a pivotal role in photovoltaic applications. However, the underwater solar spectrum differs significantly from that in air, and as water depth increases, solar spectra across various wavebands exhibit distinct attenuation rates. Specifically, the attenuation rate of the red component of sunlight is considerably higher than that of green and blue light (400–600 nm). Thus, under these unique spectral conditions, there is an urgent need to develop stable devices that minimize power conversion efficiency (PCE) loss with increasing water depth. The 4-terminal (4T) structure tandem cell, designed with 2.35 eV CsPbBr3 and 1.63 eV Cs0.05(FA0.83MA0.17)0.95Pb(I0.83Br0.17)3, is prioritized due to its suitable optical response range and low PCE loss with increasing water depth. As CsPbBr3 utilized blue and green light in tandem, which has the highest light intensity underneath water, this study employed doping of SrBr2 into the CsPbBr3 film. This approach reduced the defect density of the film, enhanced carrier transport efficiency, and improved the photoelectric responsivity of the device in the 425–500 nm band. The CsPbBr3 perovskite solar cells that were fabricated demonstrated a high open-circuit voltage of 1.46 V and an exceptional PCE of 7.62%. Additionally, these devices exhibited excellent stability. Consequently, the 4T tandem device achieved PCEs of 15.28, 11.79, and 10.33% at 0, 0.5, and 0.7 m underwater depths respectively, with a variation rate of only 32%. Furthermore, the device demonstrated remarkable stability under working conditions, with an efficiency decay of less than 13% after continuous irradiation for 30 days. These findings suggest that the 4T tandem solar cell holds considerable potential for application in underwater photovoltaics.
研究领域:
材料科学
·
能源技术
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2024
·Vol. 16
·期 18
·2563
·
IF 4.7
Ningbo Yi,Xue Guan,Xiaoting Chen,Luojia Xie,Nan Zhang,Jinfeng Liao,Long Su,Yancheng Wu,Feng Gan,Guoqiang Chang,Liyong Tian,Yangfan Zhang
Perovskite is an advanced optoelectronic semiconductor material that has garnered significant attention in recent years. However, its drawback lies in its environmental instability, limiting its practical applications. To tackle this issue, this research delved into the idea of creating a space-confined structure and used electrospinning to produce a film of perovskite nanocomposite fibers. By effectively encapsulating perovskite nanocrystals into a polymer matrix, the perovskite could be shielded from water and oxygen in the environment, thereby reducing the likelihood of perovskite decomposition and enhancing the stability of its structure and properties. This study examined the influence of material composition and the spinning process on the nanofiber structure to create good spatial confinement. This strategy resulted in a high photoluminescence quantum yield of over 80% and a long-term environmental stability of as long as 1000 h over 90% of the original PLQY. By harnessing the flexibility of the composite fibers, this study demonstrated the potential applications and performance of this nanocomposite film in flexible quantum fluorescence conversion for LED applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
·
IF 6.3
Yunjie Bai,Yiming Wang,Ruijian Liu,Yu He,Yuhao Zhang,Chu Liu,Hongmei Luan,Yanchun Yang,Chengjun Zhu
The CZTSSe absorber layer prepared with DMSO exhibits extensive cavities at its bottom, and a prominent double-layer structure is frequently observed within the CZTSSe absorber synthesized using DMF , both of which have a detrimental impact on the device performance. In this paper, an alternate spin-coating process using DMSO and DMF solvent systems is proposed, which eliminates the double-layer structure of CZTSSe and reduces the number of cavities at the bottom of the absorber layer, thereby enhancing its overall quality. This method outperforms the traditional single-solution spin-coating technique by combining the advantages of two solvent systems, allowing for the preparation of an ideal CZTSSe film without disturbing the elemental ratio, ultimately resulting in a single-layer absorber composed of large grains. After three repetitions of an identical alternate spin-coating process, the average grain size of the absorber layer increased from 0.83 to 1.21 μm. This innovative process leads to a reduction in carrier recombination and an improvement in the short-circuit current density, ultimately raising the photoelectric conversion efficiency from 7.40% to 8.88%.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Chong Dong,Meng Li,Yue Zhang,Kai-Li Wang,Shuai Yuan,Femi Igbari,Yingguo Yang,Xingyu Gao,Zhao-Kui Wang,Liang-Sheng Liao
Perovskite solar cells have attracted worldwide attention as one of the key research areas in the field of thin-film photovoltaics. Although they exhibit easy solution processability, it is important to effectively control the crystallization of the light-absorbing layer, which affects the performance and stability of devices. Here, we present lead oxalate (PbC2O4) as a nonhalide lead constituent of the perovskite precursor solution, which contributes to anion replacement during thin film annealing. This strategy limits the perovskite nucleation rate and retards crystallization. As a result, we achieved excellent perovskite films with larger grains and fewer defects. The open-circuit voltage of the optimal device under 1 sun illumination rose to 1.12 V with a power conversion efficiency (PCE) of 20.20%. In addition, the indoor PCE at 1000 lux can reach 34.86%. This nonhalide lead compound dopant provides a guide for the crystallization of perovskite materials and paves a way for the fabrication of nonhalide perovskite solar cells.
研究领域:
材料科学
·
能源科学
✓ 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）