APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Meijiao Qu,Yimin Jiang,Miao Yang,Shu Liu,Qifei Guo,Wei Shen,Ming Li,Rongxing He
Highly active and stable catalysts toward hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is extremely important but challenging for overall water splitting. Herein, a strategy by modulating surface electron densities is adopted to design new catalyst: the Ru-NiFe-P nanosheets on 3D self-supported nickel foam was developed by doping a small quantity of Ru into transition metals phosphates. The designed catalyst displays excellent electrocatalytic performance in 1.0 M KOH, with low overpotentials of 44 mV at 10 mA cm −2 for HER and 242 mV at 100 mA cm −2 for OER. Particularly, it only needs 1.47 V to yield 10 mA cm −2 for overall water splitting. Density functional theory calculations reveal that Ru-incorporated NiFe-P can generate new active sites on Ru atoms and increase the catalytic activity of original P sites leading to an optimal Gibbs free-energy on catalysts surface. This work offers a new perspective for designing admirable electrocatalysts.
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高影响因子
JOURNAL OF ELECTROCERAMICS
·
2019
·Vol. 43
·期 1
·96-105
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IF 1.966
Wang Ziyang,Chen Peng,Shi Wenjing,Li Yang,Li Dequan,Zhang Leiyang,Yan Yan,Wang Yifei,Peng He,Li Quan,Liu Gang
In the current investigation, the CuO modified BaTiO 3 ceramics were prepared through the conventional electroceramic processing. XRD, XPS, and SEM have been employed to characterize the phases, valences of ions and the microstructures. The sintering behaviors of the prepared samples were performed using a dilatometer, and ceramics could be fabricated at lower temperature. The electric field and temperature dependent energy storage performance have been studied. The introducing of CuO is very effective to improve the energy storage density and the efficiency due to the formed double P-E loops. 0.5 wt.% CuO modified ceramic exhibited an energy density of 0.52 J/cm 3 , which is nearly twice of pure BaTiO 3 ceramic. The J-E loops of CuO modified samples indicated double domain switches, consistent with the double P-E loops.
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高影响因子
TALANTA
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2019
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IF 4.916
Yujuan Cao,Song Wang,Wei Wu,Hong Peng,Ying Yu,Debin Zhu
An efficient fluorescent probe based on cucurbit[6]uril modified CdTe quantum dots (CB[6]@QDs) was prepared. This novel probe showed significant and selective fluorescence quenching and complexation capacity to p-nitroaniline, its interaction mechanism was studied by both experimental and theoretical methods. Furthermore, a fluorescent method was developed for the determination of p-nitroaniline in different environmental samples. The fluorescence intensity of CB[6]@QDs showed a good linearity response to p-nitroaniline in the concentration range of 2.5 × 10 −7 -3.0 × 10 −6 mol/L with a correlation coefficient (R 2 ) of 0.9976, the limit of detection (LOD) was 6 × 10 −8 mol/L and the limit of quantification (LOQ) was 2 × 10 −7 mol/L. Moreover, about 0–1.5 × 10 −6 mol/L p-nitroaniline were determined in environmental samples, the recoveries were in the range of 88–109% with the relative standard deviations (n = 3) of 1.2–4.5%. Compared with previous fluorescent methods, the present method shortened and simplified the sample pretreatment as well as enhanced the sensitivity and selectivity of analytical method. No further sample pretreatment procedure is needed and the LOD of present method was one order of magnitude less than previous fluorescent methods, showed it is a simple, selective and sensitive method.
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高影响因子
Science China-Chemistry
·
2019
·Vol. 62
·期 6
·767-774
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IF 6.085
Li Erpeng,Li Wenqin,Li Linchang,Zhang Hao,Shen Chao,Wu Zihua,Zhang Weiwei,Xu Xiaojia,Tian He,Zhu Wei-Hong,Wu Yongzhen
The development of p-i-n structured perovskite solar cells (PSCs) requires more extensive explorations on seeking efficient, low cost and stable hole transporting materials (HTMs). Small molecular HTMs are superior to polymeric ones in terms of synthetic reproducibility as well as purity. However, thin films composed of small molecules are usually labile during the solution-based perovskite deposition. Herein, we propose a molecular engineering strategy of incorporating oligothiophene as conjugation bridge to develop robust oligomer HTMs for p-i-n type PSCs. Upon increasing the oligothiophene chain length from α-bithiophene to α-quaterthiophene and α-hexathiophene, their HOMO energy levels remain unchanged, but their solubility in common organic solvents decreased remarkably, thus greatly enhancing their tolerance to the perovskite deposition. The rational design of oligothiophene chain length can effectively tune their optoelectronic properties as well as thin film stability under polar solvent soaking. The best performance is achieved by an α-quaterthiophene based HTM (QT), showing a high efficiency of 17.69% with fill factor of 0.81, which are comparable to those of a commercially available benchmark polymer HTM (poly[bis (4-phenyl)(2,4-dimethylphenyl) amine], PTAA) based devices fabricated under the same conditions. Our developed oligomer system not only provides the definite molecular structures like small molecule-type HTMs, but also exhibits the excellent film-forming like polymer-type HTMs, thus achieving the well-balanced parameters among solvent tolerance, thin film conductivity, and interfacial charge transfer efficiency, especially building up a platform to develop low cost and reproducible efficient HTMs in p-i-n structured perovskite solar cells.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
·
IF 3.218
Lanlan Tian,Mengkun Wang,Lian Xiong,Chao Huang,Haijun Guo,Shimiao Yao,Hairong Zhang,Xinde Chen
Poly (methyl methacrylate) (PMMA) based gel electrolyte has excellent chemical stability and low interfacial resistance but its mechanical strength is poor. In this study, organic palygorskite modified PMMA (p(OPal-MMA)/poly(vinylidene fluoride)) (PVDF) blend based electrolyte membrane was prepared via phase inversion casting technique. The physical and electrochemical properties of the blend membrane were investigated by XRD, SEM, tensile test and electrochemistry workstation. The results showed that PVDF can significantly improve the mechanical strength. The crystal phase of PVDF disappeared after blending. The porosity and ionic conductivity of the p(OPal-MMA)/PVDF membrane was 57.73% and 4.93 × 10 −3 S/cm respectively. The electrochemical stability window of Li/gel B-PVDF electrolyte/SS cell was stable up to 4.7 V (vs. Li + /Li), and the cell of Li/gel B-PVDF 43% electrolyte/LiFePO 4 exhibited good cycling performance and the Coulombic efficiency was maintained above 98.5% during all the cycling process.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
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2019
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IF 4.067
Sai Kumar Tammina,Dezhi Yang,Sivasankar Koppala,Chunsheng Cheng,Yaling Yang
In recent times, fluorescent carbon quantum dots (CQDs) as an optical sensor have attained massive attention owing to their excellent optical properties . In current investigation, our group presented an easy and economical methodology to synthesize the nitrogen and phosphorous doped carbon quantum dots (N, P doped CQDs) for sensing dopamine (DA) and temperature in aqueous medium. The synthesized CQDs were characterized by using XRD , XPS , TEM , UV–Vis, FT-IR and fluorescence techniques. The N, P doped CQDs were synthesized via one-step microwave digestion method by using citric acid , ethylenediamine and urea phosphate as precursors. This method established the noble water solubility, good optical performances and fluorescence thermosensitivity of N, P doped CQDs. Also, N, P doped CQDs demonstrated a wide linear range of 10–500 μM (R 2 = 0.994) and offered an electrifying detection limit of 0.021 μM for quantifying the dopamine. Moreover, this sensor possessed a good sensitivity, reversibility and linearity in the range of 10–70 °C. In addition, the CQDs sensing system repel the interference from probable foreign substances in real sample analysis, and attained good recoveries, which revealed the tremendous selectivity and adequate accuracy of the carbon quantum dots for sensing dopamine. The proposed N, P doped CQDs are simple as well as effective optical nanosensor and clasps venerable potential to widen the applications in analysis of biomolecules and other areas.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 8
·7725-7732
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IF 2.195
Ullah S.,Han Z.,Zheng Guangping
The nanocomposites consisting of graphene oxide (GO) and ferroelectric copolymer poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] have been successfully synthesized by a co-evaporation method. The structural, dielectric and ferroelectric properties of the composite papers are investigated. The Raman spectroscopy analyses on the nanocomposites GO/P(VDF-TrFE) reveal that the defects in GOs are reduced significantly by the loading of ferroelectric P(VDF-TrFE). The I G /I D ratio increases from 1.02 (for pure GO) to 1.17 [for GO/P(VDF-TrFE)-10%], revealing that the defects are reduced by the introduction of the nano-fillers due to a strong interaction between GO and P(VDF-TrFE) in the nanocomposites. The permittivity of the nanocomposites is enhanced by almost 3-times as compared to that of the pristine GOs. The nanocomposites show a notably raised polarization with high applied electric field. Furthermore, due to the high dielectric constants, the electrical energy storage density of the nanocomposites is as high as ~ 39.89 J cm −3 at 2.8 MV cm −1 . The large energy density and high dielectric break down strength suggest that GO/P(VDF-TrFE) could be the promising novel materials for electrical energy storage.
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JOURNAL OF MOLECULAR LIQUIDS
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2019
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IF 4.561
Hongwei Luo,Yaoyao Zhao,Dongqin He,Qing Ji,Ying Cheng,Daoyong Zhang,Xiangliang Pan
Fe@Fe 2 O 3 core-shell nanowire is a promising heterogeneous Fenton iron catalyst to degrade organic pollutants. So far, the roles of hydroxylamine (HA) in Fe@Fe 2 O 3 /HA system for pollutant degradation still remain unknown. In this study, the HA-facilitated degradation of rhodamine B (RhB) and p-nitrophenol (PNP) by Fe@Fe 2 O 3 was reported and the underlying mechanisms were explored. Results show that addition of HA significantly enhanced degradation of organic pollutants and a higher HA dosage caused a faster degradation rate . The degradation process was completely inhibited by scavengers, indicating the hydroxyl radical (HO ) from bulk solution dominated the reactions. HA in the Fe@Fe 2 O 3 /H 2 O 2 /HA system was highly efficient to promote the generation of HO by accelerating both the Fe 3+ /Fe 2+ cycle and the H 2 O 2 decomposition. Meanwhile, HA itself was rapidly decomposed along with the pollutants degradation. About 50.5% of RhB and 46.4% of PNP were mineralized in the presence of HA. The effective pH value for degradation was expanded from 4.0 to 5.0. The EE/O calculations demonstrate that a higher energy input for PNP was required than that for RhB. This study will shed lights on the reactivity of the Fe@Fe 2 O 3 /HA system and provide an alternative pathway for removal of organic contaminants.
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JOURNAL OF ORGANOMETALLIC CHEMISTRY
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2019
·
IF 2.066
Amin Khan,Haojie Yu,Li Wang,Pavel A. Zhizhko,Dmitry N. Zarubin,Dmitry A. Lemenovskiy,Fazal Haq,Muhammad Usman,Ahsan Nazir,Kaleem-ur-Rehman Naveed
Herein, poly(2-(methacryloyloxy) ethyl ferrocene carboxylate- co -(methacrylohydroxyhexane azobenzene)s) (P(FHEMA- co -MAZOHE)s) were prepared by random copolymerization and were characterized by proton nuclear magnetic resonance ( 1 H NMR) and gel permeation chromatography (GPC) to confirm the structures and molecular weights respectively. Thermal variations were analyzed by thermogravimetric (TG), differential thermogravimetric (DTG) and differential scanning calorimetry (DSC) techniques. Finally, redox and photo stimuli-responsive properties were confirmed by cyclic voltammetry (CV) and ultraviolet–visible spectroscopy (UV–vis) respectively. The results revealed that (P(FHEMA- co -MAZOHE)s) can be useful as information storage materials.
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高影响因子
JOURNAL OF POWER SOURCES
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2019
·
IF 7.467
Junjie He,Fan Zhang,Yuren Xiang,Jiarong Lian,Xin Wang,Youming Zhang,Xiao Peng,Pengju Zeng,Junle Qu,Jun Song
As a post graphene low dimensional material developed in the last two years, antimonene has attracted much attention. In contrast to graphite based low dimensional materials, antimonene is a bandgap semiconductor material, similar to black phosphorus, but its higher stability facilitates practical applications. Till to date, extensive theoretical studies have been conducted to explore their unique properties, but there are only a few experimental studies on their properties, let alone their applications. Therefore, in this study, high-quality antimonene oxide based low dimensional materials are prepared using a liquid exfoliation method in butanol . It is found that the antimonene oxide quantum dots have proper energy level alignment with CH 3 NH 3 PbI 3 . Consequently, they are successfully applied for perovskite solar cells based on copper doped nicklus oxide hole transfer layer, providing improved power conversion efficiency from 15.7% to near 18%. Detailed investigation shows that the performance improvement arises from enhanced charge extraction between hole transfer layer and perovskite. This study surely paves the way for the application of antimonene oxide based low dimensional materials in photovoltaic devices .
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
·
IF 4.084
Zequn Chen,Hongfu Jia,Jingrun Yuan,Xi Liu,Chaohe Fang,Yunying Fan,Chuanbao Cao,Zhuo Chen
To achieve high activity and stability for both hydrogen and oxygen evolution reactions through the non-precious-metal based electrocatalysts is still facing the great challenge. Herein, we demonstrate a facile strategy to prepare CoP nanoparticles (NPs) loaded on N, P dual-doped carbon (NPC) electrocatalysts with high concentration N and P dopants through a pyrolysis-deposition-phosphidation process. The great bifunctional electrocatalytic activity for both HER (the overpotential of 98 mV and 86 mV at 10 mA cm −2 in both 0.5 M H 2 SO 4 and 1 M KOH electrolytes, respectively) and OER (the overpotential of 300 mV at 10 mA cm −2 in 1 M KOH electrolyte) were achieved. When CoP@NPC hybrid was used as two electrodes in the 1 M KOH electrolyte system for overall water splitting, the needed cell potential for achieving the current density of 10 mA cm −2 is 1.6 V, and it also showed superior stability for HER and OER after 10 h’ test with almost negligible decay. Experimental results revealed that the P atoms in CoP were the active sites for HER and the CoP@NPC hybrid showed excellent bifunctional electrocatalytic properties due to the synergistic effects between the high catalytic activity of CoP NPs and NPC, in which the doping of N and P in carbon led to a stronger polarization between Co and P in CoP, promoting the charge transfer from Co to P in CoP, enhancing the catalytic activity of P sites and Co sites in CoP for HER and OER, respectively. Specifically, the improvements could result from the changed charge state, the increased active specific surface area, and the facilitated reaction kinetics by N, P co-doping and admixture. This work provides a high-efficient, low-cost and stable electrocatalyst for overall water splitting, and throws light on rational designing high performance electrocatalysts.
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Nanoscale Advances
·
2019
·Vol. 2
·期 1
·274-285
·
IF 0
Qun Wang,Sicao Yu,Wei Qin,Xiaohong Wu
Two phase photocatalysts can be intergrown with each other, resulting in superior photocatalytic properties. Herein, methylamine lead bromide (MAPbBr3) wrapped/entrapped protonated graphitic carbon nitride (p-g-C3N4) intergrowth microcrystals were fabricated by mixing a pervoskite precursor with p-g-C3N4 colloidal sol. A highly stable isopropanol (IPA) solvent based photocatalytic system for dye degradation was demonstrated. The composite with an optimal p-g-C3N4 mass percentage of 3.3 wt% (denoted as MAPbBr3/p-g-C3N4-1.0 mg) exhibited the highest photocatalytic degradation of malachite green (99.8%) within 10 min under visible light, which was 5.3-fold and 16-fold greater than that exhibited by its constituents separately. The strong chemical interaction and fundamental photophysical processes in MAPbBr3/p-g-C3N4 were systematically evaluated by spectroscopic and electrochemical techniques, confirming the effective separation of photogenerated electron–hole pairs and faster interfacial charge transfer behavior. Furthermore, active superoxide radicals (O2˙−) played a vital role in the catalytic reaction, because of the significant photoinduced electron transfer rate (ket) in the inverted type-I core/shell MAPbBr3/p-g-C3N4 band configuration structure. In addition, MAPbBr3/p-g-C3N4 has good cycling stability for 10 cycles and versatility for other cationic (RhB) and anionic (MO) dye pollutants, indicating the great potential for solar energy conversion into chemical energy.
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