Advanced Materials Interfaces
·
2021
·Vol. 8
·期 20
·2100801
·
IF 6.147
Yi Li,Hongde Luo,Longmei Mao,Longxin Yu,Xifeng Li,Libo Jin,Jianhua Zhang
In this study, p-type delafossite CuCrO 2 nanomaterials are synthesized via a one-step hydrothermal reaction. An organic photodiode (OPD) with an inverted stack is fabricated by utilizing such CuCrO 2 as the hole-transporting layer. The single OPD device shows the dark current density of 6.48 × 10 −8 A cm −2 , and an external quantum efficiency of 16.2% at a 525 nm illumination, and a −5 V bias. Its responsivity and detectivity are 68.5 mA W− 1 and 4.75 × 10 11 cm Hz 1/2 W −1 , respectively. A large-area, flat-panel image sensor is also realized similarly by applying the materials and structure onto a thin-film transistor backplane. The active area and pitch of flat-panel sensor are 75.0 mm × 81.0 mm and 150 µm, respectively and its resolution is 510 × 470. The performance of the organic image sensor is evaluated. The results indicate the materials and device have potential applications for the flat-panel detector.
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高影响因子
Molecular Catalysis
·
2021
·
IF 5.062
Jian He,Zhaozhuo Yu,Hongguo Wu,Hu Li,Song Yang
Effective synthesis of aromatic compounds from renewable biomass is highly important yet challenging. p -Cymene is an attractive aromatic compound with various promising applications in the manufacture of fine chemicals. In this study, a novel and effective catalytic system based on mesoporous tin phosphate (M-SnPO) with Lewis-Brønsted dual acidity was developed for the fast synthesis of p -cymene from the cyclodehydration of bio-based citral. Up to 78.5% yield of p -cymene was achieved from the cyclodehydration of citral at 180 °C within only 0.5 h, superior to the results reported for benchmark homogeneous acid catalysts. Characterization of as-prepared M-SnPO catalyst via various techniques indicates that the synergic effect of Lewis and Brønsted acidic sites, large pore-sized structure, and high surface area are responsible for its remarkable catalytic performance. In addition, the effectiveness of the M-SnPO catalyst could be almost sustained over multiple cycles without significant loss. The work herein is the first example of developing a Lewis-Brønsted dual acidic heterogeneous catalyst for the fast synthesis of p -cymene from the cyclodehydration of citral.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Tao Li,Lin Dai,Yixin Huang,Siwen Pan,Zijun Pang,Jing Zou
Nowadays, a number of spectrophotometric methods for Cr(VI) determination have been developed. Whereas most of them are sensitive to pH, metallic ions, temperature, etc, which render them out of feasibility and may result in erroneous measurement. Therefore, to overcome these drawbacks, a new spectrophotometric method with rapid detection, high accuracy and strong anti-interference ability was established. This method is based on the oxidative coloration of N,N -diethyl- p -phenylenediamine (DPD) and Cr(VI) to generate pink-colored DPD •+ radicals which showed maximum absorbance at 551 nm. Accordingly, different reaction parameters were optimized, the calibration curves (linear range 0.85–60 µM) were established with a high sensibility of (3.05 ± 0.02) × 10 4 M −1 cm −1 . The LOD and LOQ were determined to be 0.26 µM and 0.85 µM respectively, accompanied with a stoichiometric coefficient of near 1:3 (1:2.78). The DPD method exerted a satisfactory accuracy in natural water samples and a pretty good anti-interference performance towards various common co-existing metallic ions. Moreover, this method was successfully applied in the Cr(VI)-sulfite and Cr(VI)-hydroxylamine systems. Overall, the study highlights the DPD method as a promising approach for the Cr(VI) determination and provides a new perspective for the practices of spectrophotometry .
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2021
·Vol. 25
·期 5
·1503-1512
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IF 2.647
Zhang Aiqin,Xiao Yuanhua,Cao Yang,Fang Hua,Zhang Yong,Das Paramita,Zhang Huan
Transition metal–based catalysts are considered to be promising materials to replace noble metal catalysts for electrocatalytic water splitting. Herein, a flexible electrode composed of Co-Ni-P ternary catalysts and carbon fiber paper substrate (Co-Ni-P/CFP) was successfully fabricated and applied in water electrolysis. The Co-Ni-P coatings were deposited on CFP by a one-step cyclic voltammetric electrodeposition method and the surface of the composite material exhibits nano-reticular structure. The formation mechanism was also discussed according to the results of material characterization. Notably, the Co-Ni-P/CFP flexible electrode exhibited superior catalytic performance for both hydrogen and oxygen evolution reactions in alkaline media, which could achieve 10 mA/cm 2 current density with overpotential of 89 mV for HER and 320 mV for OER. Moreover, the Co-Ni-P/CFP electrode could also be used as both anode and cathode electrode to drive overall water splitting and required only 1.64 V to achieve a current density of 10 mA/cm 2 , which was very close to that of the commercial combination of Pt/C and IrO 2 . This affordable and easily obtained electrode offers a new avenue to develop earth-abundant resource catalysts for water electrolysis system.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Huanan Zhao,Zipeng Xing,Siyi Su,Sijia Song,Zhenzi Li,Wei Zhou
NH 2 -MIL-53(Al)/CdS p-n heterojunctions are fabricated via facile two-step hydrothermal method. The formation of p-n heterojunctions could form built-in field, which favors spatial charge separation. The resultant NH 2 -MIL-53(Al)/CdS p-n heterojunctions with narrowed band gap extend the photoresponse, and have a high specific surface area of 417.7 m 2 g −1 , and a narrow pore size of 8.8 nm. Under visible light irradiation, the photocatalytic efficiency for reduction of Cr(VI) and removal of refractory pesticide trichlorophenol is up to 99.23 and 98.85 %, respectively. The photocatalytic oxygen evolution is also as high as 563.6 μmol g −1 h −1 . The excellent photocatalytic activity can be ascribed to the efficient p-n heterojunctions accelerating charge transfer and favoring spatial charge separation, and the special mesoporous structure supplying adequate surface-active sites and facilitating mass transfer. This facile strategy opens up new insights for fabricating other p-n heterojunctions photocatalysts with efficient solar energy conversion.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Fenyang Tian,Shuo Geng,Lin He,Yarong Huang,Akhmat Fauzi,Weiwei Yang,Yequn Liu,Yongsheng Yu
Transition metal phosphides have shown Pt-like hydrogen evolution reaction (HER) activity in acid and alkaline solution, while their HER performance in neutral-pH is really poor owing to the high resistance and inefficient mass transfer in neutral-pH electrolyte. In this work, the well-arranged core/shell PSS-PPy/Ni-Co-P growing on Cu foil, in which Ni-Co-P is the core and the mixed polymer of pyrrole and sodium polystyrene sulfonate is the shell, has been demonstrated to be a highly efficient electrocatalyst for HER in neutral-pH electrolyte. The PSS-PPy/Ni-Co-P/CF self-supporting electrode was easily synthesized by electrodeposition and chemical deposition at room temperature. According to the experiment and DFT calculation results, PSS-PPy not only improves the conductivity and hydrophilicity of Ni-Co-P, but also optimizes the electronic structure of Ni-Co-P. Thus, the PSS-PPy/Ni-Co-P shows remarkable HER activity with only overpotential of 106 and 67 mV at the current density of 10 mA cm −2 in neutral-pH and alkaline electrolytes, respectively. Furthermore, PSS-PPy/Ni-Co-P has excellent stability in neutral-pH, alkaline electrolytes and even seawater. The current surface modification method directs us to design more low-cost, high-efficiency and stable electrocatalysts for HER in neutral-pH electrolyte.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2021
·
IF 7.267
Chenhong Xiao,Zhongyuan Zhou,Liujing Li,Zhenhai Yang,Shaolong Wu,Xiaofeng Li
Solar water splitting based on photoelectrochemical (PEC) cells has been intensively demonstrated to be promising for hydrogen energy , but it is usually difficult for one pure PEC system to achieve overall solar-driven water splitting. To solve this problem, integrating one PEC cell with one photovoltaic (PV) cell is widely employed, however, the preparation of an unabridged PV cell and the electrical connection between them are complicated. Herein, we directly synthesized hematite (α-Fe 2 O 3 ) film on the as-prepared p + n-Si micro-pyramid arrays with the modifications of SnO 2 interlayer and Co-Pi catalyst overlayer, and the turn-on potential achieved a substantial decrease, which is 0.34 V smaller than the Sn-doped hematite film grown on the FTO substrate (FTO/Sn@α-Fe 2 O 3 ). The influences of interlayer, overlayer and α-Fe 2 O 3 preparation conditions are systemically investigated. Besides, we comparatively studied the FTO/Sn@α-Fe 2 O 3 photoanode in tandem with the complete p + n-Si micro-pyramid PV cell, and observed the turn-on potential as low as 0.32 V vs. RHE. The performance improvement is ascribed to a combination of the additional photovoltage from the embedded p + n-Si junction, the enhancement both in optical absorption and surface area of α-Fe 2 O 3 film, and the promoted collection efficiency of photogenerated carriers from the interface and surface modifications. This work fills the gap of combining α-Fe 2 O 3 photoanode and p + n-Si junction with the aim of overall solar-driven water splitting, and provides a new route to simplify the PEC/PV tandem system.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 29
·期 4
·5043-5051
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IF 4.223
Xu
Jing,Wu Yi,Ma Mengling,Luo Tao,Xia Jun,Zhang Xiang
Iron species that occur in natural surface water could affect the photochemical behavior of pollutants. Complexation between iron species and polycarboxylate or heavy metals has been widely reported, where the ligands could be oxidized via ligand-to-metal charge transfer (LMCT) by light inducement. Such complexation and photochemical reactions might also occur for low valance metal-containing organic compounds, which is worthy of investigation. This work studied the phototransformation of p -arsanilic acid (ASA), an organic arsenic compound that is widely used as a feed additive in the poultry industry, by colloidal ferric hydroxide (CFH) using black light lamps ( λ = 365 nm) as the light source. The results revealed the contribution to ASA transformation at circumneutral conditions by CFH through an LMCT process, which is the same as that for As(III). The complexation between ASA and CFH was investigated using UV–vis spectroscopy. The estimated equilibrium constant for the CFH–ASA complex was log K f271 = 4.22. The analysis of the photoproducts found the generation of both inorganic and organic arsenic. Our findings confirmed the similarities in the photochemical mechanisms of ASA and As(III) in the presence of CFH. The results help in further understanding the fate of organoarsenicals in the surface water environment.
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PubMed
高影响因子
Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 3
·562-573
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IF 5.693
Cheng Xi Quan,Li Songwei,Bao Hongfei,Yang Xiaobin,Li Zhixing,Zhang Yingjie,Wang Kai,Ma Jun,Ullah Asmat,Shao Lu
The lack of highly permeable and selective separation membranes hampers the application of the energy-efficient membrane separation process for water remediation and CO 2 capture in molecular scale. Nanoparticles have been widely applied for tailoring pore structures and surface properties of the molecular separation membranes, thereby enhancing separation performance. However, limited by non-ideal nanoparticle aggregation, it remains a big challenge to fabricate such membranes on a large scale. Herein, we designed a kind of highly dispersed nanoparticles through grafting poly(sodium-p-styrenesulfonate) (PSS) on metal organic frameworks UiO-66 and deployed them for tailoring structure of polyelectrolyte membrane (PEM) for water remediation and Pebax (PEBA) symmetrical membranes for CO 2 capture, respectively. Because of electrostatic interaction, the PSS-grafted-UiO-66 (UiO-66-PSS) demonstrated nearly 100% dispersion in water and had an average particle size around 200 nm. Most interestingly, the introduction of the UiO-66-PSS finely tailored the affinity between membranes and target molecules, and the molecular structure of both PEM and PEBA membranes, thereby tripling the permeances of the membranes and slightly improving the selectivity of the membranes meanwhile. The PEM/UiO-66-PSS membranes demonstrated pure water permeance as high as 27.3 L m −2 h −1 bar −1 with MgSO 4 rejection above 98.7%. For CO 2 capture, the PEBA/UiO-66-PSS membranes exhibited 414.5 barrer with selectivity about 53.8. Taken together, the highly dispersed UiO-66-PSS shows strong promise in constructing molecular separation membranes with high separation performance for environmental remediation. Graphical abstract The highly dispersed PSS-grafted-UiO-66 finely tailored membrane structures of PEM membranes and the PEBA membranes and enhanced affinity between the target molecules and the aforementioned membranes, thereby tripling membrane permeances and improving the membrane selectivity slightly. The obtained PEM/UiO-66-PSS membranes and PEBA/UiO-66-PSS membranes show strong promise in water remediation and CO 2 capture, respectively.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yuxiao Gong,Lian-Hua Xu,Junji Li,Dan Shan
Research of highly dispersed transition metal phosphides (TMPs)-based catalysts for electrocatalytic hydrogen evolution is of great significance in the area of renewable energy. Herein, the high dispersion of FeNiP nanoparticles on N, P-doped electrospun carbon fibers was realized via the confinement effect induced by phytic acid (PA) and polyacrylonitrile (PAN), as well as electrospinning technique. PA and PAN were used as ligand for coordinating transition metal (TM) ions and carbon sources, respectively. In addition, the nucleophilic addition reaction between PA and PAN resulted in the cyclization of PAN and the further formation of a supramolecular network. Besides, the chelating ability of PA to TM ions was also modulated. Benefitting from the confinement effect, the optimized FeNiP/NPC800 exhibit good hydrogen evolution reaction (HER) activities for achieving a current density of 10 mA cm −2 at an overpotential of 277 mV in 0.5 M H 2 SO 4 .
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高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 3
·1781-1793
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IF 5.044
Chen Yu,Wan Caiyan,Liu Shidong,Wang Peng,Zhang Guangxian
Abstract A novel flame retardant with high P content and multi-reactive ammonium phosphorus acid groups Bis(2-hydroxyethyl) imino tris-(hydroxymethyl)-methane methylphosphonic acid (ABTMPA) was synthesized for treatment of cotton fabrics. The ABTMPA treated cotton fabrics were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction and fourier transform infrared spectroscopy (FTIR). The structure of the ABTMPA was analyzed by the nuclear magnetic resonance. The limiting oxygen index (LOI) was used to evaluate the flame retardancy and durability of the treated cotton fabrics. The LOI value of cotton fabric treated with 31% ABTMPA was 50.2%, and an LOI of 41.2% was retained after 50 laundering cycles. Micro-burning calorimetry showed that total heat of combustion of the treated cotton fabric was reduced, and the char residual was much higher than that of pure cotton. Thermogravimetric (TG) and TG-FTIR analyses indicated that the flame retardant ABTMPA changed the thermal decomposition pathway of cellulose, and the combustible gases generated at high temperature was much lower than that of pure cotton. Flame retardant treated cotton fabric had excellent flame retardancy and durability. In addition, whiteness and breaking strength are well maintained. Therefore the ABTMPA shows the potential of flame retardants in future commercial applications. Graphic abstract
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高影响因子
TRANSITION METAL CHEMISTRY
·
2020
·Vol. 46
·期 1
·37-47
·
IF 1.366
Guo Leilei,Wang Quanxiu,Shi Qingqing,Guan Ruolin,Zhao Liping,Yang Hanmin
In this study, the shape-controlled synthesis of ruthenium (Ru) nanostructures was examined using microwave irradiation. Dendritic Ru nanostructures, with an average diameter of about 34.7 nm, were successfully synthesized when ruthenium chloride (RuCl 3 ) was reduced using a reducing agent of benzyl alcohol, in the presence of polyvinylpyrrolidone (PVP) under microwave irradiation for 360 s. By examining selected parameters affecting the shape-controlled synthesis of dendritic Ru nanostructures, i.e., the concentration of the RuCl 3 precursor, different reducing agents, molecular weight of PVP and the molar ratio of RuCl 3 /PVP, were identified as key factors affecting the successful synthesis of dendritic Ru nanostructures. The catalytic performance of obtained dendritic Ru nanostructures was evaluated for hydrogenation of p-chloronitrobenzene (p-CNB). High selectivity to p-chloroaniline (p-CAN) of about 99.58% was obtained using dendritic Ru nanostructure catalysts at 80 °C under 1 MPa hydrogen pressure, having a 72.81% conversion rate of p-CNB. The selectivity to p-CAN with a dendritic Ru nanostructure catalyst is notably higher than that of conventional 5% ruthenium/carbon catalysts (62.12%). Here in we demonstrate that synthesized dendritic Ru nanostructures present a promising catalytic performance in the hydrogenation of p-CNB, having potential applicability to a wide range of catalytic reactions.
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