Journal of Energy Storage
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2023
·
IF 9.4
Xing Chen,Haijun Tao,Yinhua Jiang,Shishi Li,Yuxin Liu,Kun Xie,Yuqiao Wang
P-doped S vacancy-rich NiCo 2 S 4 hollow microspheres (P-NiCo 2 S 4-x HMSs) were prepared by hydrothermal, sulfuration, and phosphorization methods. P doping and S vacancy dual defects can be simultaneously obtained during the phosphorization process. The dual defects can modulate the electron structure and create abundant electrochemical sites, boosting electron transfer and reaction kinetics. Theoretical calculations illustrated that the dual defects could reduce the adsorption energy of OH − and Mulliken charges of Ni atoms, in favor of OH − adsorption. The hollow construction can increase the specific surface area, promote ion diffusion, and alleviate the volume variation during charge/discharge processes. The specific capacity and rate capability of the P-NiCo 2 S 4-x HMSs electrode can reach up to 1146.0 C g −1 at 1 A g −1 and 61.8 % at 30 A g −1 , respectively. The P-NiCo 2 S 4-x HMSs electrode exhibited remarkable cycling stability with a 79.5 % capacity retention after 20,000 consecutive charge/discharge cycles. The assembled P-NiCo 2 S 4-x //AC hybrid supercapacitor manifested an infusive energy density of 62.7 Wh kg −1 at 867 W kg −1 .
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2023
·
IF 6.8
Wenjuan Zhang,Xuerui Ma,Yijia Zhang,Wanjing Tong,Xing Zhang,Yong Liang,Maoyong Song
Bisphenol P (BPP), structurally similar to bisphenol A, is commonly identified in the samples of environment, food, and humans. Unfortunately, very little information is currently available on adverse effects of BPP. The obesogenic effects and underlying mechanisms of BPP on mice were investigated in this study. Compared with the control, high-resolution microcomputed tomography (micro-CT) scans displayed that the visceral fat volume of mice was significantly increased at a dose of 5 mg/kg/day after BPP exposure for 14 days, whereas the subcutaneous fat volume remained unchanged. Nontargeted metabolomic analysis revealed that BPP significantly perturbed the metabolic pathways of mouse livers, and acetyl-CoA was identified as the potential key metabolite responsible for the visceral fat induced by BPP. These findings recommend that a great deal of attention should be paid to the obesogenic properties of BPP as a result of its widely utilized and persistence in the environment.
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JOURNAL OF MOLECULAR LIQUIDS
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2023
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IF 6
Ying Han,Peng Yang,Yu Liu,Songgu Wu,Junbo Gong
This study focuses on how polymers regulate the crystal habit of p -aminobenzoic acid (PABA) from long rodlike to blocklike. To propose the regulation mechanism of polymers on the crystal habit of PABA, experiments include cooling crystallization and single crystal growth as well as molecular simulation have been carried out. Firstly, crystal form of PABA from cooling crystallization was determined as α form. Secondly, among four 1.0 wt% polymers, polyvinylpyrrolidone (PVP) played a more significant role in regulating crystal habit, which inhibited the growth of long axis resulting the growth rates of the long axis from 92.1 μm/h down to 6.7 μm/h. Furthermore, the effect of PVP chain length and concentration on crystal habit has also been studied, 0.2 wt% PVP-K17 regulated the crystal habit of PABA from long rodlike to blocklike but the effect of PVP was weakened with increasing chain length and decreasing concentration. Molecular simulation results show that the interaction between PVP-K17 and (1 1 0)/(0 1 1) face, which determines the axial growth rate, is stronger compared with other crystal faces. The mechanism of PVP-K17 regulating crystal habit was that it can be selectively adsorbed on (1 1 0) and (0 1 1) faces, hindering the diffusion and adsorption of solute molecules, inhibiting the growth of the long axis of PABA crystals, so the crystal habit of obtained crystal is blocklike.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2023
·
IF 4.5
Fanshu Xiang,Baokang Jin
The direct carboxylation of organic halides under CO 2 atmosphere by electrochemical reduction is an effective way to realize the value utilization of waste (CO 2 ), and has great potential in green organic synthesis. P-nitrophenylacetic acid is a chemical raw material in great demand, which can be used not only in medicine and other organic synthesis intermediates but also in biochemical research. In this paper, the electrochemical reduction mechanism of p-nitrobenzyl bromide (PNBB) in N 2 and CO 2 atmosphere was investigated by cyclic voltammetry (CV), in-situ FT-IR spectroelectrochemistry, and bulk electrolysis experiments. Under N 2 conditions, the electrochemical behavior of PNBB in aprotic acetonitrile solvent is a 1-electron irreversible transfer process. However, in the presence of CO 2 , it is a completely irreversible 2-electron transfer process. The electrolytic products were analyzed by 1 H NMR, 13 C NMR and MS. The results showed that the electrolytic products were 1,2-bis(4-nitrophenyl) ethane and p-nitrophenylacetic acid under N 2 and CO 2 conditions, respectively. The successful preparation of p-nitrophenylacetic acid provides more possibilities for the “green” synthesis of helpful chemical products from organic halides.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Abdul Basit,Junyou Yang,Qinghui Jiang,Zhiwei Zhou,Jiwu Xin,Xin Li,Sihui Li
Here, the intellectual challenges for thermoelectric materials revolves around the strategy of point defect engineering to regulate the electrical and thermal transport nature of Mn 1.06- x Sn x Te ( x = 0, 0.03, 0.035, 0.04, 0.045) materials. The power factor increases with substitution of Sn into the lattice of Mn 1.06 Te leading to enhance the carrier concentrations due to reduction of the band gap. Meanwhile, the thermal conductivity has also been remarkably reduced due to diverse phonon scattering and mass fluctuation by Sn substitution. As a result, a maximum ZT ∼0.93 for Mn 1.06- x Sn x Te ( x = 0.04) sample has been achieved at 873 K, which increases by 56% in comparison with the un-doped sample.
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CHEMOSPHERE
·
2018
·
IF 4.427
Yuliya E. Tyutereva,Petr S. Sherin,Marina V. Parkhats,Zizheng Liu,Jing Xu,Feng Wu,Victor F. Plyusnin,Ivan P. Pozdnyakov
The mechanism of direct UV photolysis of p-arsanilic acid (p-ASA), a widely used veterinary drug, was revised by means of laser flash photolysis coupled with high resolution liquid chromatography – mass spectrometry (LC-MS). None of p-ASA triplet state or singlet oxygen was found to directly participate in the photodegradation of p-ASA as it was assumed in previous works. Here we demonstrate that the main primary photoprocess is a monophotonic ionization (ϕ ion 266nm = 0.032) leading to the formation of hydrated electron and corresponding anilinyl cation radical. These primary species react with dissolved oxygen yielding secondary reactive oxygen species . The final organic photoproducts, such as aminophenol and different dimeric products, originate from various reactions between these secondary species. The generation of inorganic arsenic, both As(V) and As(III), was also observed in agreement with previous works. For the first time we report the quantum yield of p-ASA photodegradation, which decreases from 0.058 to 0.035 with the excitation wavelength from 222 to 308 nm.
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ACS Applied Electronic Materials
·
2019
·
IF 0
Weihao Wang,Qiufan Liao,Xiaoli Peng,Qiaoqi Lu,Zhao Li,Tao Zhang,Fengzhi Wang,Xinhua Pan,Yu-Jia Zeng,Zhizhen Ye
Tin monoxide (SnO) is a p-type semiconductor which is promising in field effect transistors (FETs) applications. However, nanostructure SnO has hardly been applied in FETs due to its stability issue. Herein, oleylamine protected Ag@SnO core–shell nanostructures have been synthesized by a hydrothermal method and configured as FETs. X-ray diffraction, Raman spectroscopy and X-ray photoelectron spectroscopy measurements are carried out to confirm the formation of pure phase SnO. The Ag@SnO core–shell single nanostructure FETs and thin film transistors are successfully fabricated on Si/SiO2 substrates. The doping of Ag in SnO and the formation of Schottky junction between SnO and Ag effectively improve the performance of FETs. The Ag nanowire (NW) core provides the unhindered carrier transport route, and the Schottky junction formed between Ag NW and SnO effectively constrains the leakage current. The nanostructure FETs show typical p-type characteristics with a premium on/off ratio (Ion/Ioff) of 3.3 × 105, a subthreshold swing of 0.09 V dec–1 and a high p-type field effect mobility (μFE) of 1.93 cm2 V –1 s –1. The excellent properties of Ag@SnO NWs FETs promise to be important for the next-generation p-type FETs.
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Advanced Materials Interfaces
·
2019
·Vol. 6
·期 12
·1900367
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IF 4.713
Lun Cai,Wenxian Wang,Lei Jin,Zhirong Yao,Wenjie Lin,Lanxiang Meng,Bin Ai,Zongcun Liang,Yuelong Huang,Fuqin Zhang,Pietro P. Altermatt,Hui Shen
Most crystalline silicon (c-Si) solar cells are based on high temperature–processed p-n junctions or highly doped heterojunctions. The concept of dopant-free carrier selective contact has become a research hotspot and been successfully demonstrated with n-type Si wafers, showing the great potential of simplified fabrication process and lower thermal-consuming. However, there are few successful cases on p-Si, dopant-free p-Si/CdS (cadmium sulfide)/ITO (indium tin oxide) solar cells with champion efficiency of 12.29% (device area 4 cm 2 ) have been demonstrated with DC magnetron sputtered CdS thin films working as electron-selective contact. A proper annealing treatment is found essential in improving the p-Si/CdS/ITO heterocontact and device performance. The author's preliminary results confirm the feasibility of preparation of efficient p-Si wafer–based dopant-free solar cells.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2018
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IF 5.667
Meng-Ya Zhu,Le-Xi Zhang,Jing Yin,Jing-Jing Chen,Li-Jian Bie,Bradley D. Fahlman
A novel organic-inorganic layered perovskite compound (C 4 H 9 NH 3 ) 2 PbI 4 has been synthesized through a simple and high-yield solution method. For the first time, this layered perovskite was used as a candidate material for gas sensors. Gas sensors based on (C 4 H 9 NH 3 ) 2 PbI 4 provided unique gas-sensing properties toward 1–800 ppm p -xylene (p-C 8 H 10 ) at the working temperature of 140 °C, including fast response, quick response-recovery, good selectivity and repeatability. The as-prepared (C 4 H 9 NH 3 ) 2 PbI 4 gas sensor can detect as low as 1 ppm concentration of p -xylene with a response of 11.8 at 140 °C. In situ diffuse reflectance Fourier transform infrared (DRFTIR) measurement shows that the p -xylene sensing mechanism can be mainly attributed to physical adsorption, which is different from other common gas-sensing metal oxides that are based on adsorption-redox-desorption mechanism.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 4
·H87
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IF 3.12
Jinnan Wu,Yuhan Zhu,Kai Yan,Jingdong Zhang
Redox active hexacyanoferrate (HCF) was immobilized on CdS-graphene (CdS-G) electrode to study the photovoltammetric behavior of p-phenylenediamine (PPD). Under visible light illumination, the immobilized HCF could quickly consume photogenerated carriers on CdS-G electrode and mediate the photoelectrocatalytic oxidation of PPD, leading to an enhanced anodic limiting current response. The HCF/CdS-G electrode fabricated with 1% graphene content in CdS-G composites and 0.3 mmol·L−1 K4[Fe(CN)6] was found to show the optimum photovoltammetric response to PPD. The fabricated HCF/CdS-G electrode was explored for photovoltammetric determination of PPD, which showed a current response linearly proportional to PPD concentration from 1.0 × 10−7 to 1.0 × 10−5 mol·L−1. The detection limit (3S/N) was 4.7 × 10−8 mol·L−1. Moreover, the HCF/CdS-G electrode displayed good reproducibility and high stability. The developed photovoltammetric method was successfully applied to the determination of PPD in environmental water samples.
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DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 12
·4015-4025
·
IF 4.052
Haiyu Wang,Zhiliang Jin,Xuqiang Hao
The development of a highly active and stable non-noble-metal hydrogen-producing catalyst for renewable energy reserves and conversion remains a serious challenge. In this work, we described a novel binary solution (DETA/H2O) reaction for preparing a composite catalyst composed of CdS nanoparticles grown on CoSe2 nanobelts. The composite catalyst (CoSe2/CdSDETA) exhibits excellent catalytic activity for a hydrogen evolution reaction in an EY sensitized 15% (v/v) TEOA aqueous solution under visible light irradiation (λ ≥ 420 nm). Moreover, the catalytic activity of the P-doped sample (CoSe2/CdSDETA|P) was further improved. The excellent performance is ascribed to the synergy among DETA and atomic-level P-doping. Some essential characterization methods such as XRD, SEM, TEM, UV-vis diffuse spectroscopy, XPS, photoelectrochemistry, PL, etc. were carried out to support the related results and a possible reaction mechanism was put forward.
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Jing Chen,Huanming Wei,Haijun Chen,Wenhao Yao,Hualin Lin,Sheng Han
The N/P co-doped hierarchical porous carbon materials are synthesized by SiO 2 -template approach following potassium phosphate activation. Polyvinylidene fluoride is used as the carbon source, melamine as the nitrogen source and potassium phosphate as the phosphorus source and activator. The obtained porous carbon materials exhibit a hierarchical pore structure (∼0.6 and ∼4 nm), a large specific surface area (1431 m 2 g −1 ) and a high nitrogen and phosphorus content. These predominant characteristics enable the CNP-5-800 sample to exhibit a superior specific capacitance of 337 F g -1 at 0.5 A g −1 and outstanding cycling stability of 97.8% retention after 10000 cycles in a three-electrode system. Even in the two-electrode system (an all-solid-state symmetric capacitor), this kind of materials still can deliver an energy density of 23.1 W h kg −1 to 12.4 W h kg −1 at power densities of 720.4 W kg −1 to 13950 W kg −1 , respectively, and a cycling property of 98.7% maintenance after 5000 cycles. Therefore, the practicable synthetic method and excellent electrochemical performance make CNP- x - y materials a potential candidate in supercapacitor application.
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