Journal of Nano Research
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2023
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IF 1.7
Bi Wu,Jian Wei Zhao,Li Rong Qin,Yuan Ji Xiang
Transition metal phosphides (TMPs) are potential candidates for supercapacitors. To improve their performance by adjusting their morphology and composition, hierarchical CoP@NiMn-P nanocomposites were successfully prepared by the hydrothermal method, electrodeposition, and low-temperature phosphorization. NiMn-P nanosheets were coated on CoP nanowires to form a hierarchical structure. Electrochemical analysis results indicated that the specific capacitance reached 2162.2 F g-1 at 1 A g-1 with a high capacitance retention ratio of 83.3% after 5000 cycles at a current density of 10 A g-1. This excellent electrochemical performance was attributed to the large specific surface area and enhanced conductivity. Furthermore, an asymmetric supercapacitor, CoP@NiMn-P//AC, was prepared using CoP@NiMn-P as the positive electrode and AC as the negative electrode. A large voltage window of 1.6 V and high energy density of 21.1 Wh kg-1 at 804.3 W kg-1 with a good capacity retention rate were achieved. The results confirm that CoP@NiMn-P has good potential for application in high-performance energy storage devices and provide a reference for the design of phosphide with morphology/composition optimization.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
FLUID PHASE EQUILIBRIA
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2014
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IF 2.241
Guo-Min Yu,Li-Sheng Wang,Chao-Jun Du,Jian Sun
A phosphorous flame retardant of phosphoric acid , P , P ′-1,4-phenylene P , P , P ′, P ′-tetraphenyl ester (PAPTE) was synthesized by diphenyl chlorophosphate and hydroquinone . The structural features of PAPTE were investigated with mass spectra (MS), infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR) and high-performance liquid chromatograph (HPLC) methods. The thermal behavior of PAPTE was analyzed with differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA) instruments. A static analytic method was used to measure the solubilities of PAPTE in the several selected pure solvents, which are methanol, ethanol, acetone, ethyl acetate , acetonitrile , methyl acetate , toluene, ether, n -propanol, i -propanol, where the temperatures range is from 288.25 to 333.45 K. The experiments were also performed in the binary mixed solvents of acetone and methanol. Several thermodynamic models were used to correlate the experimental solubility data, such as Wilson, nonrandom two-liquid (NRTL), UNIQUAC equations. The solubility data of PAPTE in binary solvents were correlated with the modified Wilson model. The calculated results showed that those models can excellently reproduce the experimental data and the UNIQUAC equation reveals the better ability in correlation. Using the Scatchard–Hildebrand methodology, the activity coefficients, solubility parameter of the solute and the partial molar excess enthalpies at infinite dilution were calculated.
研究领域:
化学工程
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材料科学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
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2024
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IF 5.5
Minglan Dai,Ting Zhang,Juan Huang,Xiaomin Lang,Qing Li,Jian Zou,Chunmei Li,Jianfeng Tang,Hua Lin
Building p-p heterojunctions with Fermi level difference, due to the motion of energy levels, band bending, and internal electric field generation, can effectively improve the electronic structure of the interface, enrich the active sites of heterojunctions, and promote the adsorption of reaction intermediates, which is an effective approach to constructing high-performance electrocatalysts . In this study, a Co 3 O 4 /MoS 2 p-p heterojunction catalyst with nano-particle/nano-flower structure was designed, inducing charge transfer from Co 3 O 4 to MoS 2 , thereby increasing the negative charge of MoS 2 , improving *H adsorption through electrostatic interaction , enhancing electrocatalytic kinetics, and reducing reaction overpotential. The catalytic performance of MoS 2 for hydrogen evolution reaction was effectively enhanced. In 1 M KOH solution, the current density was 10 mA cm −2 , and the overpotential was 156 mV, with good stability after 40 h of operation. This work provides a new direction for the design of p-p heterojunction electrocatalysts and offers more choices for promoting the development of high-performance non-noble metal catalysts.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Huan Su,Chao Shan,Xiaolin Zhang,Bingcai Pan
Chemical oxidation is essential in treating P(I)/P(III)-bearing wastewater, while conventional oxidation processes suffer from low selectivity and high cost induced by oxidant reagents. Herein, a low-cost catalyst PdNi 10 was developed to rival the noble metal Pd, which had been known as the only catalyst enabling chemical-free oxidation of P(I)/P(III) into P(V) by ambient O 2 . The PdNi 10 fabricated via optimized method even outperformed Pd in catalytic activity at identical dosage (0.10 g L −1 ), achieving efficient conversion of 1.00 mM of P(I) into P(V) (>94% in 30 min) with wide applicable pH range from 3.0 to 9.0. The aerobic oxidation of P(I) and P(III) over PdNi 10 was confirmed via scavenging experiments to be both dominated by non-radical pathways with apparent activation energies of 44.5 and 21.3 kJ mol −1 , respectively. Interestingly, the individual roles of Ni components of PdNi 10 in the catalytic oxidation were found negligible. The H 2 O-methanol binary solvent experiment suggested that H 2 O mediated the catalytic reaction and the interfacial OH groups as a result of H 2 O dissociation served as the main reactive oxidant species for P(I)/P(III) oxidation. Furthermore, synergistic mechanism was proposed for the Ni and Pd sites with favorable roles in the essential reaction steps of dehydrogenation and hydroxylation, respectively. This study is believed to advance the treatment strategy of P(I)/P(III)-rich wastewater and to shed new light on the development of low-cost catalysts enabling chemical-free aerobic oxidation processes under facile condition.
研究领域:
环境科学
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催化
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化学工程
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材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
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2024
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IF 5.4
Bo Pei,Yinmei Li,Shenhui Ma,Yuyu Bu
The photoelectrochemical (PEC) water splitting performance of Si-based PEC devices is usually restricted by low stability and weak photogenerated carrier transport ability. Herein, a micropyramid array structure (p-SiMPs)/p-Cu2O/PhC2Cu/Pt photocathode device with a p-p-n heterojunction structure is developed. In this tandem PEC device, a p-p heterojunction of p-SiMPs/p-Cu2O is achieved, endowing a higher interface electric field and stronger energy of photoinduced electrons for PEC water reduction. In addition, a stable n-type PhC2Cu protective layer is prepared on the surface of the PEC device by the photoassisted polymerization method, which can improve the stability of PEC water reduction largely. After Pt cocatalytic layer deposition, the p-SiMPs/p-Cu2O/PhC2Cu/Pt tandem photocathode can achieve a saturation photocurrent density of −30 mA/cm2 at −0.9 V (vs RHE) and a photocurrent threshold voltage of −0.1 V for water reduction. This work provides a silicon-based p-p-n heterojunction tandem structure for the PEC water splitting; meanwhile, it indicates that PhC2Cu is a potential material to improve the stability of silicon-based PEC devices.
研究领域:
材料科学
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能源转换技术
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半导体物理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2021
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IF 2.694
Xu Jie,Chen Mengqi,Wei Yan,Hao Shuanghong
In this article, we propose a method of recovering p-MePhSO3K from the industrial by-product of quizalofop-p-ethyl. The phase diagram of the solid–liquid equilibrium system of p-MePhSO3K2CO3–H2O at the temperatures of 15, 25, 35, 45, and 55 °C was determined and plotted. Based on the phase diagram of 25 °C, the separation and recovery process of p-MePhSO3K from the p-MePhSO3K2CO3–H2O system was designed by analyzing the crystallization fields. First, p-MePhSO3K and K2CO3 were crystallized from wastewater in turn through evaporation separation. Then, the crystallized p-MePhSO3K was purified further by washing with ethanol. Finally, the pure p-MePhSO3K was transformed into the intermediate p-toluenesulfonyl chloride and then the intermediate l-p-toluenesulfonate ethyl lactate for quizalofop-p-ethyl production.
研究领域:
化学工程
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工业化学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE REVIEW AND LETTERS
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2019
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IF 0.748
XIANGRUI MENG,MEIFENG HAO,YIWEI JIANG,XIANGZHENYUE SUN,YAN WANG,YUQING MIAO
A simple wet-explosion method was employed to synthesize the Ni–Bi–P composite microspheres. The hollow structure was obtained possibly due to the violent evolution of gas bubbles when the reaction reagents were mixed. The hollow microspheres of Ni–Bi–P exhibited outstanding high catalytic activity for the reduction of p -nitrophenol ( p -NP) to form p -aminophenol in the presence of NaBH 4 within only 1 s. Due to the space limitation, the hollow structure of Ni–Bi–P microspheres helps to accommodate and confine the molecules of NaBH 4 and p -NP within the small space where NaBH 4 and p -NP contact closely at Ni–Bi–P catalysts. The synergetic action of Ni, Bi and P elements also contributes the enhanced catalytic activity.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
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2020
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IF 4.231
Abdul Haleem,Jun Chen,Xiao-Xiao Guo,Jia-Yun Wang,Hui-Juan Li,Peng-Yun Li,Sheng-Qi Chen,Wei-Dong He
Temperature-responsive macro-porous cryogels of poly( N -iospropylacryamide- co -acrylamido-2-methylpropane sulfonic acid) [P(NIPAM- co -AMPS)] were prepared through redox-initiated cryo-polymerization at −12, −18 and −24 °C. Silver or gold nanoparticles (AgNPs or AuNPs) were formed inside P(NIPAM- co -AMPS) cryogels through the thermal reduction of absorbed AgNO 3 or HAuCl 4 , resulting in hybrid cryogels immobilized with AgNPs or AuNPs. Fourier transform infrared spectroscopy , thermal gravimetric analysis and X-ray diffraction confirmed the chemical composition . Cryogel morphology and nanoparticle distribution were investigated through scanning and transmission electron microscopies . By checking swelling ratio in neutral water, the temperature response of cryogels was identified. The hybrid cryogels were used as the catalysts to reduce p -nitrophenol with NaBH 4 at different temperatures and pHs. The hybrid cryogel with AuNPs had the higher catalytic activity than the counterpart hybrid cryogel with AgNPs. The catalytic activity of hybrid cryogels increased with temperature and pH. The temperature response of cryogels facilitated their isolation from the reaction mixture. Since AuNPs were fixed tightly onto the cryogel pore-wall and hardly lost, hybrid cryogels with AuNPs demonstrated no decrease in catalytic activity for 5 cycles of p -nitrophenol reduction.
研究领域:
材料科学
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催化化学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
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IF 4.598
Zhiyang Zhong,Aijuan Xie,Jie Pan,Menglu Li,Jiaojie Wang,Shixin Jiang,Jiaqi Lin,Shichao Zhu,Shiping Luo
A novel core–shell p-p homotype heterojunction based on NiO@LaMnO 3 and multi-walled carbon nanotubes (NiO@LaMnO 3 /MWCNTs) has been designed and synthesized via electrostatic self-assembly method. The phase compositions and morphology were verified by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM). A series of electrochemical tests showed that NiO@LaMnO 3 /MWCNTs modified electrode had a magnifying effect on the electrochemical response signal of ascorbic acid (AA) detection. The current response is linearly increased in the range of 2.60–36.44 μmol/L with the linear regression equation being I (μA) = 0.5902 C (μmol/L) + 1.4407 (R 2 = 0.9909), and the detection limit (S/N = 3) being 2.41 μmol/L. Moreover, NiO@LaMnO 3 /MWCNTs/GCE electrochemical sensor presented satisfying selectivity, stability, repeatability, and can be used to analyze the AA concentration in real daily drinks. The relatively excellent electrocatalytic activity should be attributed to high electroactive surface area, well-matched core–shell structure and synergetic effect of p-p homotype heterojunction. This work offer applicable guidelines for the design of core–shell p-p heterojunction electrode materials for the application of electrochemical sensor.
研究领域:
材料科学
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分析化学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2015
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IF 4.321
Fei Wang,Jing Ren,Yunliang Cai,Long Sun,Chuanling Chen,Shuai Liang,Xingmao Jiang
High dispersed palladium nanoparticles with the size of about 3.8 nm confined within ZSM-5 zeolite catalyst (Pd/ZSM-5-IS) was successfully synthesized by in situ synthesis method based on azeotropic distillation assisted fabrication. Liquid phase selective hydrogenation of p -nitrophenol (PNP) to p -aminophenol (PAP) was chosen as model reactions to evaluate the catalytic behavior of the Pd/ZSM-5 catalysts. Thiophene and 4,6-dimethyldibenzothiophene were used as poisons to test their anti-poisoning ability. Pd/ZSM-5-IS catalyst exhibited higher catalytic activity in hydrogenation of PNP to PAP than sample prepared by impregnation method (Pd/ZSM-5-IM), which was mainly attributed to entering of Pd nanoparticles into the intracrystalline mesovoids of the ZSM-5 support for in situ method efficiently prevent active sites from loss and aggregation. In addition, Pd/ZSM-5-IS catalyst not only maintained high activity for five consecutive runs, but also showed high sulfur tolerance for the hydrogenation reactions. This simple and versatile method also can be extended to cover many kinds of other supported catalysts for broad applications in many other catalytic reactions in the future.
研究领域:
催化化学
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材料科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
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2017
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IF 4.339
Miaomiao Liu,Weiqiang Tang,Yisheng Xu,Hongbo Yu,Hongfeng Yin,Shuangliang Zhao,Shenghu Zhou
Pd-SnO 2 heteroaggregate nanocatalysts were synthesized by in-situ transformation of PdSn bimetallic nanoparticles on alumina. The PdSn bimetallic nanoparticles were prepared by co-reduction of Pd and Sn precursors. The obtained PdSn nanoparticles possibly have a core-shell like structure with Pd cores and Sn-rich shells due to the fast reduction of Pd precursors. The Pd-SnO 2 /Al 2 O 3 heteroaggreagte nanocatalysts were synthesized by calcination of PdSn/Al 2 O 3 in air followed by H 2 reduction. Various characterization techniques, such as HRTEM, XRD and XPS, were used to characterize the PdSn and Pd-SnO 2 . The Pd 3 -(SnO 2 ) 1 /Al 2 O 3 heteroaggreagte nanocatalysts with a ratio of Pd/Sn of 3/1 illustrated enhanced catalytic performances for p -nitroacetophenone and p -nitrobenzaldehyde hydrogenations relative to monometallic Pd nanocatalysts. Theoretical calculations using density functional theory suggested that Pd-SnO 2 facilitates the adsorption of reactants in a higher degree than that of products, thus enhancing the catalytic activity even with partial coverage of Pd surfaces with SnO 2 . The blockage effect of SnO 2 on Pd surfaces is speculated to enhance the catalytic selectivity for p -nitroacetophenone and p -nitrobenzaldehyde hydrogenations over Pd-SnO 2 heteroaggregate nanocatalysts.
研究领域:
催化化学
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材料科学
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理论计算
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2020
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IF 6.182
Yi Zhang,Qi Wang,Dongming Liu,Qian Wang,Tong Li,Zhou Wang
A novel isotype (p-p) heterojunction, on the basis of Cu 2 O coupled with BiOI, has been designed and synthesized via a facile two-step electro-deposition approach at room temperature. The morphology, phase compositions and chemical bonding state were verified by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction measurements (XRD) and X-ray photoelectron spectra (XPS). The optimized Cu 2 O/BiOI hybrid electrode exhibited boosted photoelectrochemical (PEC) H 2 O 2 non-enzymatic sensing performance under visible light illumination, with a phenomenally broad linear range (1.99 µM ~ 17.54 mM), a high sensitivity of 213.87 µA mM −1 cm −2 , as well as a low detection limit of 0.44 µM (S/N = 3). Additionally, the sensor presented satisfying selectivity, repeatability, stability and its feasibility in real samples was corroborated. The photoelectrochemical sensing mechanism was clarified in the view of band structure and p-p heterojunction. Our work would enlighten the perspective research on the application of isotype heterojunction in PEC bio-sensing and provide a promising non-enzymatic biosensor platform for effective detection of H 2 O 2 in food, biomedical and environment analysis.
研究领域:
材料科学
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生物医学工程
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）