查找使用阿拉丁产品的科研文献

Interface optimization of hole-conductor free perovskite solar cells using porous carbon materials derived from biomass soybean dregs as a cathode

Haichao Liu,Yahong Xie,Peng Wei,Wei Wang,Huamei Chen,Cong Geng,Yue Qiang

Hole transporting material (HTM)-free carbon-based perovskite solar cells (C–PSCs) have attracted widespread attention for their notable characteristics of excellent long-term stability and low cost. However, the power conversion efficiency (PCE) of C–PSCs is significantly lower than that of HTM-based PSCs. This is mostly due to the unexpected electron recombination happening at the interface of perovskite/carbon. In this study, biomass-based carbon materials were obtained from discarded soybean dregs with sufficient pore size and good conductivity through programmed temperature carbonization and KOH activation processes. Composites of KOH-activated soybean dregs carbon and conductive carbon were used as the counter electrodes (CEs) of C–PSCs, the electrode interface performance was significantly improved and a PCE of 12.05% was obtained, which was 50% higher than that of pure carbon-based C–PSCs. Through long-term stability tests, it was found that the efficiency of the unpackaged cell did not decrease in after 960 h in the air.

Alcohol solvent treatment of PEDOT:PSS hole transport layer for optimized inverted perovskite solar cells

Liu Yue,Cai Hongkun,Chu Yinhuan,Su Jian,Ye Xiaofang,Ni Jian,Li Juan,Zhang Jianjun

Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is widely used as a hole transport materials in perovskite solar cells, due to a variety of suitable properties. However, the existence of the insulated PSS chain leads to the low electrical conductivity, which should be improved for the further development of inverted perovskite solar cells. In this study, three alcohol solvents were proposed for post-treatment of PEDOT:PSS thin films, which utilized the electrostatic shielding effect of alcohol molecules to promote phase separation of the PEDOT chain and the PSS chain. At the same time, The insulated PSS chain was removed by dissolving in highly hydrophilic alcohols. In the end, we successfully improved the conductivity of PEDOT:PSS thin films. By ethanol solvent treatment, the short-circuit current density of the perovskite solar cell based on glass/ITO/PEDOT:PSS was increased from 15.64 to 17.45 mA/cm 2 , the power conversion efficiency (PCE) reached 11.36%, which was 25% higher than the traditional structure. For flexible devices, a preliminary PCE of 9.20% was achieved.

Fabrication of robust superhydrophobic filter paper for oil/water separation based on the combined octadecanoyl chain bonding and polymer grafting via surface-initiated ATRP

Zhang Kangmin,Wang Miaomiao,Wu Mingyuan,Wu Qingyun,Liu Jiuyi,Yang Jianjun,Zhang Jianan

Abstract Effective separation of oil and water has always been a long-term challenge. Here we introduce a facile and fluorine-free method to fabricate superhydrophobic and superoleophilic filter paper without the decoration of solid particles for robust oil/water separation. After chemically bonding octadecanoyl and α-bromoisobutyryl groups on the surface of filter paper through simultaneous esterification with stearoyl chloride and α-bromoisobutyryl bromide (BiBB) to obtain C18-FP-g-Br, superhydrophobic poly(styrene-co-acrylonitrile) (SAN) grafted filter paper (C18-FP-g-SAN) was fabricated via surface-initiated atom transfer radical polymerization. The obtained C18-FP-g-SAN showed a water contact angle of 153° and achieved a separation efficiency exceeding 98.5% after ten different typical oil/water separation processes due to the synergistically combined contributions of bonded octadecanoyl chain and grafted SAN. C18-FP-g-SAN remained high separation efficiency after 10 cycles of use and treatment with strong acidic or basic solution. The excellent reusability and chemical stability of C18-FP-g-SAN promise its practical applications of continuous oil/water separation and oil spillage cleanup. Graphic abstract

Morphology control of organic halide perovskites by adding BiFeO3 nanostructures for efficient solar cell

Xu Haowen,Zhang Heyi,Ma Yuhui,Jiang Mao,Zhang Yewei,Wu Yinan,Zhang Haoran,Xia Ruidong,Niu Qiaoli,Li Xing’ao,Huang Wei

The morphology of perovskite light-absorption layer plays an important role in the performance of perovskite solar cells (PSCs). In this work, BiFeO 3 (BFO) nanostructures were used as additive for CH 3 NH 3 PbI 3 (MAPbI 3 ) via anti-solvent method. The addition of BFO nanostructures greatly enhanced the crystallinity, grain size and film uniformity of MAPbI 3 . As a result, the charge carrier mobility and electron diffusion length increased, leading to the increase of the short circuit current (J SC ) of PSCs. This work provides a very simple but effective approach to improve the morphology of perovskite layer for efficient PSCs.

A modified QuEChERS/GC–MS for simultaneous determination of 16 pesticide adjuvant residues in fruits and vegetables

Li Genrong,Yu Wenqin,Xiao Zhaojing,Long Mei,Tong Lanyan,Qiu Yue

A rapid, sensitive, and practical QuEChERS method coupled with gas chromatography–mass spectrometry was developed for the simultaneous determination of 16 chemical adjuvant residues in samples of fruits (apple, nectarine, grape) and vegetables (tomato, cucumber, spinach). All target compounds were separated in less than 16 min. Samples were extracted with acetonitrile, and the types of extraction salt and cleanup sorbent were optimized. The optimized method was validated by evaluating the linearity, accuracy, precision, and matrix effect. The recoveries of the 16 pesticides adjuvants ranged from 61.2 to 116.3% with relative standard deviations lower than 11.6%. Limits of detection ranged from 0.21 to 3.02 μg/kg, and limits of quantification ranged from 0.71 to 10.07 μg/kg. Finally, the developed method was successfully employed to identify and quantify pesticide adjuvant residues in the analysis of 30 real fruit and vegetable samples.

Improvement of CsPbBr3 photodetector performance by tuning the morphology with PMMA additive

Zhenghai Ou,Yongsheng Yi,Ziting Hu,Jiajie Zhu,Wenzhen Wang,Hua Meng,Xiaozheng Zhang,Shengqi Jing,Shanhu Xu,Feng Hong,Jian Huang,Juan Qin,Fei Xu,Run Xu,Yanyan Zhu,Linjun Wang

The optoelectrical properties of semiconductor devices are strongly related to the film morphology. Here, we found that, for CsPbBr 3 thin films prepared by spray coating, the addition of polymethyl methacrylate (PMMA) can completely eliminate voids and greatly reduce the surface roughness of the as-deposited films. As a consequence, the optoelectronic properties of the photodetectors fabricated as a simple vertical structure of Au/CsPbBr 3 (PMMA)/ITO can be improved. With the addition of PMMA, the dark current of the photodetector is reduced at least four times, and the photodetector exhibits a favourable optical response. With the illumination ranging from 400 to 510 nm, the calculated responsivity varies from 3.70 to 5.20 A/W. A good response speed with a rise time of 6.6 ms and a decay time of 11.3 ms can be achieved. Moreover, unlike the inorganic-organic hybrid perovskite detectors, this inorganic perovskite photodetector without encapsulation shows a favourable stability with a decay of 20% after 40 days under ambient air at 20% humidity.

Improved air stability and low voltage resistive switching behaviors of NiO-buffered CH3NH3PbI3 films prepared by a solution method

Y Y Wang,L T Li,X Jiang,J B Wang,R L Lai,X Y Qiu

Electric field-induced drift of ions or charged defects in organic–inorganic hybrid perovskite materials generally results in distinct current–voltage hysteresis, opening up a new era in the development of low-cost resistive switching memory and neural synapse devices. Here, a new type of resistive switching memory cell based on NiO-buffered CH3NH3PbI3 films is prepared by a solution method. It exhibits stable and low voltage bipolar resistive switching behaviors: switching voltages lower than  ±0.5 V, an ON/OFF ratio higher than 103, and a reversible current–voltage loop of more than 400 cycles in air ambient. Both 'iodine-vacancy conductive filaments' and the 'interfacial p–n junction effect' are responsible for the improved resistive switching properties. This work establishes the potential for application in low operation voltage organic–inorganic hybrid perovskite resistive switching devices.

Efficient and stable perovskite solar cells thanks to dual functions of oleyl amine-coated PbSO4(PbO)4 quantum dots: Defect passivation and moisture/oxygen blocking

Chong Chen,Fumin Li,Liangxin Zhu,Zhitao Shen,Yujuan Weng,Qiang Lou,Furui Tan,Gentian Yue,Qingsong Huang,Mingtai Wang

The defects in perovskite crystals and the penetration of moisture/oxygen into the perovskite layer are major problems for perovskite solar cells (PSCs) to achieve long-term stability and high power conversion efficiency (PCE). However, there is still a lack of multifunctional passivation materials to solve these problems. Herein, for the first time, we report oleyl amine-coated PbSO 4 (PbO) 4 quantum-dots (QDs), as a passivation material with dual functions to simultaneously passivate the surface defects and block the penetration of moisture/oxygen into the perovskite layer for stable and efficient PSCs. The PbSO 4 (PbO) 4 QDs significantly reduce the defect density of the as-prepared CH 3 NH 3 PbI 3 films by passivating under-coordinated Pb ions and I anions and effectively enhance charge extraction efficiency at the TiO 2 /CH 3 NH 3 PbI 3 and CH 3 NH 3 PbI 3 /spiro-OMeTAD interfaces. Moreover, the hydrogen bond between H atoms of the OA and I atoms of the perovskite and the interface electric field at CH 3 NH 3 PbI 3 /OA interface also contribute to the improvement of efficiency and stability of PSCs. Finally, higher PCE (20.02%) is achieved by the PSCs with OA-coated PbSO 4 (PbO) 4 QDs compared to that (16.86%) of the PSCs without OA-coated PbSO 4 (PbO) 4 , corresponding to a 18.7% enhancement. Moreover, the PSCs with OA-coated PbSO 4 (PbO) 4 QDs maintain 90% of initial efficiency after operation for 280 h, indicating better stability than the PSCs without PbSO 4 (PbO) 4 QDs.

Phosphorene nanocomposite with high environmental stability and antifouling capability for simultaneous sensing of clenbuterol and ractopamine

Ge Yu,Qu Mingren,Xu Lanjiao,Wang Xiaoqiang,Xin Junping,Liao Xiaoning,Li Meifa,Li Mingfang,Wen Yangping

A series of phosphorene (BP) nanocomposites was prepared to realize simultaneous electrochemical determination of clenbuterol (CLB) and ractopamine (RAC). CLB and RAC are the most commonly used β-agonists in animal-derived food. The BP nanohybrid was obtained by co-decoration with both mono(6-mercapto-6-deoxy)-β-cyclodextrin and poly(3,4-ethylenedioxythiophene) nanoparticles. It displays high stability, antifouling capability, a large electrochemical active surface and good electrochemical response. The electrochemical assisted antifouling strategy was selected by further eliminating the fouling of the electrode surface using continuous cyclic voltammetry. The electrode was employed for electrochemical sensing of CLB and RAC at typical peak voltages of 0.8 and 1.0 V (vs. SCE). Responses are linear in the 0.3–90 μM concentration range for CLB, and from 0.3 to 9.4 μM for RAC under optimal conditions. The limit of detection are 0.14 and 0.12 μM, respectively. The sensor was employed for simultaneous determination of CLB and RAC in (spiked) beef, feed and bovine serum samples with acceptable recoveries. An electrochemically assisted anti-fouling method for simultaneous voltammetric nanosensing of clenbuterol (CLB) and ractopamine (RAC) in edible cattle product samples using high-stable and anti-foul phosphorene (BP) co-decorated with mono(6-mercapto-6-deoxy)-β-cyclodextrin (S-β-CD) and poly(3,4-ethylenedioxythiophene) (PEDOTNPs).

All-Inorganic Perovskite Solar Cells Based on CsPbIBr2 and Metal Oxide Transport Layers with Improved Stability

Jien Yang,Qiong Zhang,Jinjin Xu,Hairui Liu,Ruiping Qin,Haifa Zhai,Songhua Chen,Mingjian Yuan

Despite the successful improvement in the power conversion efficiency (PCE) of perovskite solar cells (PSCs), the issue of instability is still a serious challenge for their commercial application. The issue of the PSCs mainly originates from the decomposition of the organic–inorganic hybrid perovskite materials, which will degrade upon humidity and suffer from the thermal environment. In addition, the charge transport layers also influence the stability of the whole devices. In this study, inorganic transport layers are utilized in an inverted structure of PSCs employing CsPbIBr2as light absorbent layer, in which nickel oxide (NiOx) and cerium oxide (CeOx) films are applied as the hole transport layer (HTL) and the electron transport layer (ETL), respectively. The inorganic transport layers are expected to protect the CsPbIBr2film from the contact of moisture and react with the metal electrode, thus preventing degradation. The PSC with all inorganic components, inorganic perovskite and inorganic transport layers demonstrates an initial PCE of 5.60% and retains 5.56% after 600 s in ambient air at maximum power point tracking.Keywords:inorganic perovskite;CsPbIBr2;metal oxide transport layers

Design of Prussian Blue Analogue-Derived Magnetic Binary Ce–Fe Oxide Catalysts for the Selective Oxidation of Cyclohexane

Shuang Wei,Hao Li,Kexin Li,Ruirui Zhang,Guosheng Wang,Ruixia Liu

We report the fabrication of Ce–Fe oxides (CFOs) derived from Prussian blue analogues (PBAs) with different shapes of sphere (CFO-S), bipyramid (CFO-B), and flower (CFO-F), which are prepared by controlling the volume ratio of water and ethanol and the addition of deep eutectic solvents (DESs) to control the solvent environment using a modified coprecipitation method. The structure, morphology, and the surface properties of Ce–Fe oxides were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). The catalytic performance of PBA-derived Ce–Fe oxides was evaluated for the oxidation of cyclohexane, which positively correlated with surface oxygen vacancy and the amount ratio of Ce/Fe. The conversion for cyclohexane of CFO-S and CFO-B was 9.03 and 9.25%, respectively. However, CFO-S had a higher selectivity for K/A-oil (cyclohexanone and cyclohexanol) of 81.8%, resulting from the exposed crystal plane (100) compared to CFO-B (75%). Besides, CFO-F was rich in the Fe2O3 crystal phase, which is beneficial for KA selectivity. It was found that Ce3+, Fe3+, and OV had an important influence on the activation of C–H bonds, which provides a reference for the design of efficient alkane oxidation catalysts.

Simple Molecules as Hole Transport Materials Enabled by Solvothermal Technology: Towards Solution-Processable Carbon Electrode Perovskite Solar Cells

Yuntao He,Xin Ke,Wenying Shi