CARBON
·
2019
·
IF 7.466
Yahong Xie,Jian Cheng,Haichao Liu,Junli Liu,Buhaidiqie Maitituersun,Junhong Ma,Yue Qiang,Haokun Shi,Cong Geng,Yudong Li,Guihua Yang
Carbon-based perovskite solar cells (PSCs) have received widespread attention due to their low cost and high stability. The carbon electrode prepared by the doctor blade method easily forms defects at the interface between the perovskite layer, thereby reducing its photoelectric conversion efficiency (PCE). In this study, an easily deformable Co–Ni alloy@carbon aerogel was added between the carbon electrode and the perovskite layer via the grinding process, thereby effectively improving the interface quality and hole transporting ability. Correspondingly, the open-circuit voltage and fill factor of the hole-transport-material-free PSCs were significantly improved. A PCE of 12.71% was achieved, but it decreased to 10.77%, which remained at 86%, after 1296 h in the air. Chronoamperometry, Nyquist characterization, and capacitive effect were used to explain the cause of the hysteresis in the PSCs in detail.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Zhengdong Liu,Mengya Song,Shang Ju,Xiao Huang,Xiangjing Wang,Xiaotong Shi,Ya Zhu,Zhan Wang,Jie Chen,Hai Li,Yingchun Cheng,Linghai Xie,Juqing Liu,Wei Huang
In this work, we report a universal surface-assisted oxidative polymerization strategy for wafer-scale fabrication of ultrathin two-dimensional conjugated microporous polymers (2D CMPs) on arbitrary substrates under ambient conditions. Three kinds of 2D CMPs with average thickness of 1.5–3.6 nm were prepared on SiO2/Si substrates by using carbazole based monomers. Moreover, 2D CMPs can be grown on reduced graphene oxide (rGO) substrate to construct large-area 2D CMP/rGO heterostructure. As a proof-of-concept demonstration, an organic vertical field-effect transistor based on 2D CMP/rGO heterostructures was fabricated, which exhibited typical p-type behavior with high reproducibility and on/off current ratio. Most importantly, the direct growth of large-area 2D CMPs on arbitrary substrates is compatible with the conventional processes in the semiconductor industry, and therefore is expected to expedite the development of 2D CMPs as building blocks for construction of practical electronic devices.
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PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Ruochong Zhang,Dan Qiao,Xuqing Liu,Zhiguang Guo,Litian Hu,Lei Shi
The dispersibility of TiO2 nanoparticles in polyalphaolefin (PAO) are improved by the interaction between the chemically modified TiO2 (denoted as TTO) and 1-methyl-2,4-bis (N-octadecylurea) benzene (MOB) gelator. Tribological tests show the outstanding friction-reducing and antiwear performances of PAO10–MOB–TTO under the common friction condition and higher temperature friction condition, respectively. The lubricating property of PAO10–1% MOB–0.5% TTO is further enhanced after UV irradiation for 40 min, which might be attributed to the photocatalytic effect of TTO under UV. The physical adsorption film is enhanced by the immobilization function of MOB. The chemical reaction film including various organic oxides and nitrides are produced for the active element in TTO and MOB. The antiwear performance is further improved by the “mending effect” of TTO with the good dispersibility. The combined effects of various factors promote the excellent lubricating performances of PAO10–1% MOB–0.5% TTO.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 24
·16263-16275
·
IF 2.993
Li Jiali,Kong Xianggui,Jiang Meihong,Lei Xiaodong
Up to now, although tremendous effort has been made in exploring Pd-based catalysts for the Suzuki–Miyaura coupling reactions, there is still much room to enhance its catalytic performance by synthesis catalyst with define-designed and tailored structure. Herein, a new kind of Pd-based structured catalyst with hierarchical hollow structure (Pd/Co(OH) 2 /Cu(OH) 2 /copper foam) has been successfully synthesized by three facile steps. As framework, the hierarchical hollow nanoarray structure of Co(OH) 2 /Cu(OH) 2 /copper foam is fabricated by immersion and electrolytic deposition methods. Uniformly dispersed Pd nanoparticles with a narrow size distribution (1.5 ± 0.2 nm) are anchored on the surface of the hierarchical nanotube array through an in situ spontaneous redox reaction between Co(OH) 2 and PdCl 4 2− without any surfactant at room temperature. Compared with other synthesis approaches, it just takes less than 1 h for the whole fabrication process in our strategy, exhibiting very high efficiency. In order to evaluate the catalytic performance of the as-prepared structured catalyst, 16 kinds of reagents were chosen as substrates for Suzuki–Miyaura coupling reaction, exhibiting excellent activity and reusability under mild conditions. We hope this simple and efficient method will open a new strategy to design and prepare structured catalysts.
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Communications Chemistry
·
2018
·Vol. 1
·期 1
·1-11
·
IF 0
Li Hu,Zhao Wenfeng,Saravanamurugan Shunmugavel,Dai Wenshuai,He Jian,Meier Sebastian,Yang Song,Riisager Anders
The production of liquid fuels and fine chemicals often involves multi-step reaction processes with selective hydrogenation as one of the key steps. This step most often depends on high-pressure excess hydrogen gas, fossil resources, and newly prepared metallic catalysts. Here we describe an approach to tune activity and selectivity toward transfer hydrogenation of renewable biomass derivatives over commercially available Pd/C using liquid hydrosilane as hydrogen source. The appropriate control of water-doping content, acid type, reaction temperature, and liquid H − donor dosage permits the selective formation of four different value-added products in high yields (≥90%) from bio-based furfural under mild reaction conditions (15–100 °C). Mechanistic insights into the hydrosilane-mediated cascade reactions of furfural are obtained using isotope labeling. The catalyst is recyclable and can selectively reduce an extensive range of aromatic carbonyl compounds to the corresponding alcohols or hydrocarbons in 83–99% yield, typically at 25–40 °C.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 4
·1-10
·
IF 5.705
Ji Renyue,Chen Shuai,Xu Wei,Qin Zhen,Qiu Jing Fu,Li Chao Rui
An ultrasensitive immunosensor for the direct detection of the illegally used livestock feed clebuterol (CLB) is described. It is based on the use of a glassy carbon electrode modified with an MoS 2 -AuPt nanocomposite and on biotin-streptavidin interaction. The use of MoS 2 -AuPt accelerates electron transfer, and this leads to a sharp increase in the electrochemical signal for the electrochemical probe hydrogen peroxide. Differential pulse voltammetry was used to record the current signal at a peak potential of −0.18 V (vs SCE). Under optimal conditions, the electrode has a linear response in the 10 pg·mL −1 to 100 ng·mL −1 CLB concentration range and a 6.9 pg·mL −1 detection limit (based on the 3σ criterium). This immunosensor is sensitive, highly specific and acceptably reproducible, and thus represents a valuable tool for the determination of CLB in pork.
Schematic of a voltammetric immunosensor for the determination of clenbuterol (CLB) based on the use of a nanocomposite prepared from molybdenum disulfide and a gold-platinum alloy (MoS 2 -AuPt), and making use of the biotin-streptavidin system.
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高影响因子
Chinese Physics B
·
2018
·Vol. 27
·期 3
·038402
·
IF 1.321
Wei-Kang Xu,Feng-Xiang Chen,Gong-Hui Cao,Jia-Qi Wang,Li-Sheng Wang
To date, many efforts have been made to improve the performance of paintable carbon-based (PC-based) perovskite solar cells (PSCs). Though great progress has been achieved, their power conversion efficiencies are still relatively low compared with hole-transport-materials-based PSCs. General research on influencing factors of performance in PC-based PSCs is still insufficient. In this work, PC-based PSCs were fabricated in ambient air and four groups of controlled experiments were performed in which the PbI2 layers were prepared with or without antisolvent extraction treatment. These four groups of experiments were designed to find out the effect of different influencing factors on PC-based PSCs performance, for example, PbI2 residual, the surface morphology of the perovskite film, the surface roughness of the perovskite film, and the contact status of the perovskite/carbon electrode interface. With a systematic analysis, we demonstrated that the contact status of the perovskite/carbon electrode interface played a vital role in PC-based PSCs, and a flat, smooth perovskite surface could help to improve this contact status significantly. Besides, on the precondition of a poor contact interface, no PbI2 residual and a good surface morphology only brought limited benefits to the performances of PC-based PSCs.
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Physica Status Solidi-Rapid Research Letters
·
2018
·Vol. 12
·期 6
·1800025
·
IF 3.721
Chunfeng Lan,Guangxing Liang,Huabin Lan,Huanxin Peng,Zhenghua Su,Dongping Zhang,Huibin Sun,Jingting Luo,Ping Fan
Antimony sulfide (Sb 2 S 3 ) thin film is a promising light absorber for solar cell application due to its suitable bandgap, high absorption coefficient, and non-toxic constituents. However, thermally evaporated Sb 2 S 3 thin films experience sulfur loss during evaporation and post-annealing, which do harm to the film quality and the performance of the devices. In this work, for the first time Sb 2 S 3 thin films are prepared by thermally evaporating antimony pentasulfide (Sb 2 S 5 ) precursor. The thermal and microstructural properties of Sb 2 S 3 and Sb 2 S 5 precursors are studied and compared. The crystallization of the Sb 2 S 3 film (S-5) prepared from Sb 2 S 5 precursor is inferior to that (S-3) from Sb 2 S 3 powder. And the annealed S-5 film shows a larger bandgap of 1.69 eV than S-3. However, compared with S-3, planar S-5 thin film solar cells in the configuration of glass/(SnO 2 :F) FTO/TiO 2 /Sb 2 S 3 /Spiro-OMeTAD/Ag exhibit an apparently improved photovoltaic performance, with the best power conversion efficiency of 3.75% and high fill factor of 0.56, which is the highest efficiency of thermally evaporated planar Sb 2 S 3 solar cell. The capacitance–voltage ( C–V ) measurement indicates that this might come from the higher C–V derived space-charge density in S-5. This work offers a new method to prepare Sb 2 S 3 thin films for efficient solar cells.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Kai Fan,Feng Zhou,Changxu Chen,Ye Li,Weisong Li,Bo Xiao,Chunjian Xu
Isobaric vapor–liquid equilibria of tert-butanol + chlorobenzene and tert-butyl acetate + chlorobenzene binary systems and the tert-butanol + tert-butyl acetate + chlorobenzene ternary system at 101.33 kPa were measured using a circulation VLE still. The data of binary systems passed the thermodynamic consistency test of the Herington method and the Van Ness point test, and the experimental data of the ternary system also passed the Wisniak consistency test. These binary systems’ VLE data were fitted by the Wilson, nonrandom two-liquid (NRTL), and universal quasichemical (UNIQUAC) activity coefficient models with minor deviations. Furthermore, the obtained binary interaction parameters from the binary systems were used to predict the VLE behavior of the tert-butanol + tert-butyl acetate + chlorobenzene ternary system. The rmsd of vapor and the temperature between the experimental and predicted values for the ternary system were smaller than 0.0304 and 0.81K, respectively. The results indicated that the relative volatility between tert-butanol and tert-butyl acetate obviously increased when adding chlorobenzene as a solvent. Thus, chlorobenzene is a promising solvent for the separation of the tert-butanol and tert-butyl acetate mixture system by extractive distillation.
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ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 10
·1706276
·
IF 13.325
Liangbin Xiong,Minchao Qin,Cong Chen,Jian Wen,Guang Yang,Yaxiong Guo,Junjie Ma,Qi Zhang,Pingli Qin,Songzhan Li,Guojia Fang
Planar perovskite solar cells (PSCs) based on low-temperature-processed (LTP) SnO 2 have demonstrated excellent photovoltaic properties duo to the high electron mobility, wide bandgap, and suitable band energy alignment of LTP SnO 2 . However, planar PSCs or mesoporous (mp) PSCs based on high-temperature-processed (HTP) SnO 2 show much degraded performance. Here, a new strategy with fully HTP Mg-doped quantum dot SnO 2 as blocking layer (bl) and a quite thin SnO 2 nanoparticle as mp layer are developed. The performances of both planar and mp PSCs has been greatly improved. The use of Mg-SnO 2 in planar PSCs yields a high-stabilized power conversion efficiency (PCE) of close to 17%. The champion of mp cells exhibits hysteresis free and stable performance with a high-stabilized PCE of 19.12%. The inclusion of thin mp SnO 2 in PSCs not only plays a role of an energy bridge, facilitating electrons transfer from perovskite to SnO 2 bl, but also enhances the contact area of SnO 2 with perovskite absorber. Impedance analysis suggests that the thin mp layer is an “active scaffold” selectively collecting electrons from perovskite and can eliminate hysteresis and effectively suppress recombination. This is an inspiring advance toward high-performance PSCs with HTP mp SnO 2 .
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JOURNAL OF CHROMATOGRAPHY A
·
2018
·
IF 3.716
Rong Wang,Zhenkun Mao,Zilin Chen
A novel monolithic column based on the copolymerization of ethylene dimethacrylate and a deep eutectic solvent (DES), which composed of chlorocholine chloride and itaconic acid, was developed for capillary electrochromatography (CEC). The structure and morphology of the obtained monolithic column was characterized by Fourier transform infrared spectra and scanning electron microscopy, which showed a porous monolithic structure with good permeability. The influence of pH value and acetonitrile content on electroosmotic flow (EOF) of DES-based monolithic column was investigated. The DES-based monolithic column was used as the separation column of CEC and exhibited excellent performance for the separation of neutral compounds, phenols, toluidines, nucleosides, nucleotide bases and alkaloids. The retention mechanism might be attributed to synergistic effect of hydrophobic interaction, hydrogen bond interaction and electronic interaction. The DES-based monolithic column showed good repeatability with relative standard deviations of migration time less than 0.80%, 2.15%, 4.26% and 3.08% for intra-day, inter-day, column-to-column and batch-to-batch, respectively. Thus, organic polymer monolithic columns with DESs as functional monomers are a promising option in chromatographic separation.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Hao Zhang,Yalan Wang,Hong Wang,Meiyang Ma,Shuai Dong,Qingyu Xu
Photoelectric conversion efficiency of organic-inorganic perovskite solar cells has been rapidly raised and attracted great attention in recent years. The quality of perovskite films is vital for the performance of devices. We used the anti-solvent method to prepare CH 3 NH 3 PbI 3 thin films by spin coating and dried them at various temperature to transform adduct MAI·PbI 2 ·DMSO into CH 3 NH 3 PbI 3 . We researched in detail on the relationship between surface morphology of MAPbI3 thin films fabricated by the anti-solvent method and various drying temperature. We found that surface roughness and grain size of CH 3 NH 3 PbI 3 films together increased with increasing drying temperature. The larger grain size could efficiently reduce crystal boundaries which is advantageous for the suppression of photo-induced charge carrier recombination resulting in increase of FF. However, increase of surface roughness resulted in larger contact area at interface which might produce more tarp states and poorer wettability of HTM solution leading in decrease of J sc . Surface morphology of MAPbI3 layer on the performance of solar cell devices is also an important research issue. By optimizing the drying temperature to 60 °C, the highest efficiency of 14.4% was achieved for the CH 3 NH 3 PbI 3 -based solar cell devices.
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