ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Dongyang Li,Weiguang Kong,Haichao Zhang,Deng Wang,Wang Li,Changwen Liu,Hong Chen,Weidong Song,Fangliang Gao,Abbas Amini,Baomin Xu,Shuti Li,Chun Cheng
Inverted perovskite solar cells (PSCs) with a C60 framework are known for their common drawback of low power conversion efficiency (PCE) of <20% because of nonradiative recombination and inefficient charge transport at their perovskite interfaces. Here, we report an ultrathin [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) as a cap layer on perovskite films to overcome this issue. Such a functional cap layer efficiently passivates trap states and establishes a gradient energy level alignment onto perovskite, facilitating the efficient charge transfer and extraction. The as-fabricated inverted PSCs capped with such ultrathin PCBM exhibit a record PCE of 20.07%. After the storage under a N2 atmosphere for more than 500 h, the PCE of PSCs retains over 85% of its initial level. Our work provides an effective method to upgrade inverted PSCs with the C60 framework with improved efficiency and stability.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
PubMed
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
·
IF 4.2
Wen-Rong Fu,Jian Yang,Zong-Yan Zhao
This investigation sought to improve the photoelectrochemical performance of CuFeO 2 -based photocathodes by integrating copper foam (CF) substrate to leverage enhanced light trapping and electrical conductivity. CuFeO 2 powders, synthesized via a hydrothermal method, were deposited onto various substrates including fluorine-doped tin oxide (FTO), smooth copper foil, rough copper foil, and CF, to construct the photocathodes. The CF substrate, characterized by its rough surface and three-dimensional porous architecture, demonstrated a superior capacity for light trapping, substantially augmenting light absorption efficiency. Concurrently, the inherent conductivity of copper facilitated improved carrier collection and transfer rates. Consequently, the CF/CuFeO 2 photocathode achieved the highest carrier concentration and the most rapid interfacial electron transport rate among the tested configurations. This resulted in the CF/CuFeO 2 photocathode achieving the highest photocurrent density, approximately 3.64 μA/cm 2 , which represents a tenfold increase compared to the FTO/CuFeO 2 photocathode. Furthermore, the CF/CuFeO 2 photocathode showcased notable mechanical and chemical stability, underscoring its potential for enhanced photoelectrochemical applications.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2020
·
IF 9.567
Chenghao Bi,Xuejiao Sun,Xin Huang,Shixun Wang,Jifeng Yuan,Jun Xi Wang,Tönu Pullerits,Jianjun Tian
All inorganic halide perovskites in the form of colloidal quantum dots (QDs) have come into people’s view as one of the potential materials for the high-efficiency solar cells; nevertheless, the high surface trap density and poor stability of QDs restrict the performance improvement and application. Here, we obtain colloidal inorganic perovskite CsPb1–xZnxI3 QDs by the hot-injection synthesis process with the addition of ZnCl2. Synchrotron-based X-ray absorption fine structures demonstrate that the guest Zn2+ ions are doped into the CsPbI3 structure to improve the local ordering of the lattice of the perovskite, reducing the octahedral distortions. The increase of the Goldschmidt tolerance factor and the Pb–I bond energy also enhance the stability of the perovskite structure. Furthermore, the Cl– ions from ZnCl2 occupy the iodide vacancies of the perovskite to decrease the nonradiative recombination. The synergistic effect of doping and defect passivation makes for stable colloidal CsPb0.97Zn0.03I3 QDs with ultralow density of trap states. The champion solar cell based on the QDs shows a power conversion efficiency of 14.8% and a largely improved stability under ambient conditions.
研究领域:
材料科学
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纳米技术
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太阳能
·
化学
✓ 已验证
产品关联
DOI
高影响因子
REVIEW OF SCIENTIFIC INSTRUMENTS
·
2016
·Vol. 87
·期 10
·
IF 1.336
Huo Xinming,Tang Fei,Zhang Xiaohua,Chen Jin,Zhang Yan,Guo Cheng’an,Wang Xiaohao
The rectilinear ion trap (RIT) has gradually become one of the preferred mass analyzers for portable mass spectrometers because of its simple configuration. In order to enhance the performance, including sensitivity, quantitation capability, throughput, and resolution, a novel RIT mass spectrometer with dual pressure chambers was designed and characterized. The studied system constituted a quadrupole linear ion trap (QLIT) in the first chamber and a RIT in the second chamber. Two control modes are hereby proposed: Storage Quadrupole Linear Ion Trap-Rectilinear Ion Trap (SQLIT-RIT) mode, in which the QLIT was used at high pressure for ion storage and isolation, and the RIT was used for analysis; and Analysis Quadrupole Linear Ion Trap-Rectilinear Ion Trap (AQLIT-RIT) mode, in which the QLIT was used for ion storage and cooling. Subsequently, synchronous scanning and analysis were carried out by QLIT and RIT. In SQLIT-RIT mode, signal intensity was improved by a factor of 30; the limit of quantitation was reduced more than tenfold to 50 ng mL −1 , and an optimal duty cycle of 96.4% was achieved. In AQLIT-RIT mode, the number of ions coexisting in the RIT was reduced, which weakened the space-charge effect and reduced the mass shift. Furthermore, the mass resolution was enhanced by a factor of 3. The results indicate that the novel control modes achieve satisfactory performance without adding any system complexity, which provides a viable pathway to guarantee good analytical performance in miniaturization of the mass spectrometer.
研究领域:
分析化学
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仪器科学与技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
·
2018
·
IF 2.869
Xiaoyu Zhou,Xinwei Liu,Spencer Chiang,Wenbo Cao,Ming Li,Zheng Ouyang
Ion trap is an excellent platform to perform tandem mass spectrometry (MS/MS), but has an intrinsic drawback in resolving power. Using ion resonant ejection as an example, the resolution degradation can be largely attributed to the broadening of the resonant frequency band (RFB) between ion motion and driving alternative-current (AC). To solve this problem, stimulated motion suppression (STMS) was developed. The key idea of STMS is the use of two suppression alternative-current (SAC) signals, which both have reversed initial phases to the main AC. The SACs can block the unexpected sideband ion resonances (or ejections), therefore playing a key role in sharpening the RFB. The proof-of-concept has been demonstrated through ion trajectory simulations and validated experimentally. STMS provides a new and versatile means for the improvement of the ion trap resolution, which for a long time has reached the bottleneck through conventional methods, e.g., increasing the radio-frequency (RF) voltage and decreasing the mass scan rate. At the end, it is worth noting that the idea of STMS is very general and principally can be applied in any RF device for the purposes of high-resolution mass analysis and ion isolation.
研究领域:
分析化学
·
质谱学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2019
·
IF 4.309
Lin Guan,Nan Jiao,Yiping Guo
Trap-state passivation has been validated to efficiently improve the performance of perovskite solar cells. Small volatile molecules and polymers both have the ability to reduce the trap states in perovskite. Herein, we demonstrate the feasibility of passivation by nonvolatile small molecules with carboxylic acid groups such as benzoic acid, p-phthalic acid, and trimesic acid. They can obviously increase the fill factor of the photocurrent density–voltage curves. Furthermore, the relationship between the molecular structure and passivation effect is proposed by fixing the concentration of carboxylic acid groups. Trimesic-acid-doped perovskite solar cells significantly increase the power conversion efficiency from 12.52 ± 0.67 to 14.51 ± 0.81 (champion efficiency, 15.81%) under standard AM 1.5G illumination. Our work expands the chemical additives in perovskite and further demonstrates how the additive molecular structure influences the performance of solar cells.
研究领域:
材料科学
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太阳能
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光伏技术
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2022
·
IF 8.008
Fuxing Xu,Weimin Wang,Li Ding,Xiang Fang,Chuan-Fan Ding
Development of fragment ion detection methods is of great importance for mass spectrometer advancement or substance identification. To date, collision induced dissociation (CID) remains the most commonly used ion activation method in MS/MS experiments, and the effectiveness of CID in an ion trap mass spectrometer is limited by low mass cutoff and weak fragmentation yields. Theoretically, controlling the q value is the key to maintain the fragment efficiency and trapping efficiency of MS/MS, thus improving the detection of fragment ion, while currently reported techniques usually require complex circuitry and often produce different CID patterns. In this paper, with the developed synchronized reversed scanning–collision induced dissociation (SRS-CID) technique, we demonstrate its effective improvement in fragment ion detection. The SRS-CID is implemented on a digital ion trap mass spectrometer (DITMS) by reverse scanning the q values during CID process, or specifically, the frequency is increased during the CID process. With the SRS-CID technique, the fragmentation efficiency of precursor ions can be slightly improved. For reserpine analyte, the trapping efficiency for low-mass fragment ions is improved at least 3 times, and for YGGFL, the trapping efficiency for low-mass fragment ions is improved at least 9 times. These experimental results can also be validated by simulations, and the kinetic energy variation plot suggests consecutive fragmentation occurs. In any case, the SRS-CID provides a solution to the low efficiency of fragment ion detection during tandem MS analysis, which will certainly be useful in the future.
研究领域:
分析化学
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质谱学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
·
2014
·Vol. 28
·期 15
·1764-1768
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IF 2.642
Zhong-yao Zhang,Cuiping Li,Chuan-fan Ding,Fuxing Xu,Baoqiang Li,Qibin Huang,Hengxin Xia
RATIONALE The pivotal challenge associated with miniature mass analyzers is their proper design and construction without sacrificing performance. In order to analyze and improve the performance of a miniature linear ion trap with odd and even multipole fields, we designed a novel asymmetrical arc-shaped electrode ion trap (AAEIT), and tested the properties of AAEITs with different dimensions. METHODS A series of asymmetrical ion traps using arc-shaped electrodes were designed to optimize the properties (resolutions and intensity) of the coupling effects between odd and even multipole fields. Using arginine and reserpine, we evaluated the performance of mass resolution, ion intensity ratio and deduced the collision-induced dissociation (CID) efficiency using a self-constructed electrospray ionization mass spectrometry (ESI-MS) platform. RESULTS An AAEIT with field radius dimensions of 5 mm × 5.75 mm exhibits a good performance: its maximum resolution of 833 (FWHM) at m/z 175 was achieved for the side of small electrode. With this AAEIT, a tandem mass (MS/MS) capability with 91.0% CID efficiency was obtained with reserpine ( m/z 609). CONCLUSIONS The results indicated that the AAEIT, comprising both odd and even multipole fields, could act as a qualified linear ion trap mass analyzer with compact structure, high resolution, and high tandem mass analysis efficiency. It has a great potential in miniature mass spectrometry. Copyright © 2014 John Wiley & Sons, Ltd.
研究领域:
分析化学
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质谱技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Science China-Chemistry
·
2018
·Vol. 61
·期 4
·490-496
·
IF 4.448
Liu Zexi,Zou Hongyan,Wang Ni,Yang Tong,Peng Zhewei,Wang Jian,Li Na,Huang Chengzhi
Photoluminescence (PL) mechanism of carbon quantum dots (CQDs) remains controversial up to now even though a lot of approaches have been made. In order to do that, herein a PL color ladder from blue to near infrared of CQDs with the absolute quantum yields higher than 70% were prepared via a one-pot hydrothermal synthesis route and separated by silica gel column. Time-correlated single photon counting measurements suggest that the electron transition takes in effect in the PL progress of the crystalline core-shell structured CQDs, and the PL properties could be coarsely adjusted by tuning the size of the crystalline carbon core owing to quantum confinement effects, and finely adjusted by changing the surface functional groups consisted shell owing to surface trap states, respectively. Both coarse and fine adjustments of PL, as optical and photoelectrical characterizations and density-functional theory (DFT) calculations have demonstrated, make it possible for top-level design and precise synthesis of new CQDs with specific optical properties.
研究领域:
材料科学
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纳米技术
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光学
·
物理化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Peng Liu,Yuchi Zhang,Bohan Li,Le Han,Yan Xu
Anti-counterfeiting and encryption are key technologies for information transmission in modern society. Whereas, most optical materials reported only provide single luminous color and fixed response mode, which limits their safety in advanced anti-counterfeiting applications. In this work, we reported a Bi 3+ -assisted trap depth engineering strategy to achieve a dual-mode dynamic photoluminescence response of MgGa 2 O 4 : Bi 3+ with intriguing anti-counterfeiting and encryption performances. Upon the ultraviolet (UV) of 254 nm irradiation for 20 s, the color of MgGa 2 O 4 : x% Bi 3+ (x = 0, 1.0, 2.0, 3.0, 5.0) samples showed dynamic transformation from green or near-infrared to bluish-white emission. Combined with the dynamic photoluminescent (PL) behavior of MgGa 2 O 4 : 2.0% Bi 3+ , high-level dynamic anti-counterfeiting and encryption properties of MgGa 2 O 4 : Bi 3+ for tagging spies were investigated through powder filling followed by a masked screen printing method. On the other hand, the fluorescence intensity ratios (FIR) of I 430 nm /I 500 nm and I 430 nm /I 709 nm for MgGa 2 O 4 : 2.0% Bi 3+ showed excellent temperature-dependent quenching behaviors in the temperature range of 283 to 393 K, and the relative temperature sensitivities for FIR of I 430 nm /I 500 nm and I 430 nm /I 709 nm are 2.18% and 2.98% K −1 at 283 K, respectively. These results inspired more flexible designs to safeguard information security and develop novel high-efficiency optical temperature detectors.
研究领域:
材料科学
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光学
·
信息安全
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温度传感
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Yuan Zhou,Yang Yang,Xun Zhu,Ding-ding Ye,Rong Chen,Qiang Liao
The power generation property of direct liquid fuel cells at high current densities is plagued by gas bubbles generation. Herein, we propose a bubble-trap layer to help mitigate the problem and improve the power generation stability performance. A novel chip-based liquid fuel cell with the bubble-trap layer is fabricated as a facile visualization and fast test platform, validating that most of CO 2 bubble releases from the bubble-trap layer in situ rather than at the microchannel outlet. The dynamic behaviors of gas bubbles are visualized and their impact on the power generation performance is discussed. It suggests the fuel cell equipped with the bubble-trap layer has superior power generation stability, power density (29 mW cm −2 ) and current density (163 mA cm −2 ), which are 10% and 27% higher than that without the bubble-trap layer. And a maximum power density of 35 mW cm −2 is achieved. The bubble growth and gas emission mechanisms are analyzed according to the mechanical model, providing a guidance for the channel design and operation condition determination of cells. These results demonstrate the viability of applying the bubble-trap layer for stabilizing power generation and cast new light on the structure design of direct liquid fuel cells.
研究领域:
能源科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2023
·Vol. 56
·期 38
·384002
·
IF 3.4
Yushun Zhao,Yufan Xu,Gilbert Teyssèdre,Jianyi Xue,Yanning Zhao,Bin Du
Epoxy insulators in gas insulated switchgear and gas insulated transmission lines tend to accumulate surface charges, leading to insulation flashover. Improving the surface trap characteristics of epoxy materials, which can accelerate the surface charge dissipation of epoxy insulators, is a promising method to improve the surface insulation performance. The surface trap characteristics of epoxy materials are strongly influenced by the chemical groups in the acid anhydride molecules. In this work, by quantum chemical calculations and isothermal surface potential decay tests, taking six organic anhydrides that differ only in the methyl and carbon–carbon double bonds, we find the modulation laws of methyl and carbon–carbon double bonds on the charge trap depth within and between molecular chains. The regulation mechanism is revealed from the microscopic perspectives of electron energy structure and electron cloud offset. The changes of surface charge trap depth of epoxy materials are primarily attributed to the changes in the spatial distribution of the electron cloud density between and on the valence bonds caused by the interaction between the electron-donating methyl group and the electron-absorbing carbon–carbon double bond.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）