JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2014
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IF 2.063
Jianhong Tan,Lei Guo,Shenying Xu
Corrosion inhibition of indole-3-carboxylic acid (ICA) on mild steel in 0.1 M H 2 SO 4 solution has been studied through weight loss, potentiodynamic polarization , electrochemical impedance spectroscopy (EIS), and scanning electron microscope (SEM) experiments. Plots from polarization and EIS techniques show ICA acts as a mixed type inhibitor and its high inhibition effectiveness is assumed to occur via the adsorption of the inhibitor molecules on steel surface. It is then found that this adsorption behavior obeys the Langmuir adsorption isotherm . Theoretical techniques incorporating molecular mechanics and molecular dynamics were used to simulate the adsorption of ICA molecule on Fe(1 1 0) surface.
研究领域:
材料科学
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腐蚀科学
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电化学
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表面工程
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Yurong Ren,Xiaofang Lai,Minhao Guo,Ruiqi Wang,Jun Deng,Jikang Jian
Three layered quaternary sulfides, NaLi M S 2 ( M = Mn, Fe, Co) were synthesized by solid-state reactions. They adopt a trigonal CaAl 2 Si 2 -type structure (S.G. P -3 m 1) with Li and M randomly distributed at the tetrahedral metal site. Magnetic measurements reveal spin-glass ground states for these compounds, in contrast to the long-range antiferromagnetic order in the ternary counterpart NaFe 1.6 S 2 . As evidenced by electrical resistivity and optical measurements , all these three compounds show semiconducting nature, consistent with the results of first-principles calculations. The measured band gaps are 3.4 eV and 1.25 eV for NaLiMnS 2 and NaLiCoS 2 , respectively. Photoelectric measurements on NaLiCoS 2 demonstrate its potential application in photovoltaic devices .
研究领域:
材料科学
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固体化学
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凝聚态物理
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无机化学
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功能材料
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高影响因子
ENERGY
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2023
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IF 9
Wei Lu,Ao Gao,Yuntao Liang,Zhenglong He,Jinliang Li,Yong Sun,Shuanglin Song,Shaocong Meng
A stable and highly efficient 1, 1, 3, 3, 3-hexamethyldisilazane (HMDS) terminated m-Cresol inhibitor was synthesized based on the protection-deprotection strategy. The inhibitory effect of HMDS terminated m-Cresol inhibitor on spontaneous combustion of lignite was explored through temperature-programmed oxidation tests, in-situ infrared analysis and thermogravimetric analysis. Results show that, the oxidation of active phenolic hydroxyl groups in the m-Cresol inhibitor can be hindered by the protection of HMDS. After encountering coal, the HMDS terminated inhibitor can be gradually deprotected to regenerate the m-Cresol inhibitor that contains massive active phenolic hydroxyl groups, thus improving the chemical inhibition efficiency of coal spontaneous combustion. For the coal sample inhibited with HMDS terminated m-Cresol inhibitor, the initial contents of the active functional groups are lower and more stable during heating, and the inhibition rate reaches 70% at 130 °C. Moreover, the crossing-point temperature rises by 32.4 °C–181.2 °C. The activation energy increases by 11 kJ/mol and 18 kJ/mol at below and above 130 °C respectively. The peak temperature at maximum weight loss rate rises by 65 °C–431.2 °C, and the corresponding residual carbon rate increased by 31.3%–61.6%. The inhibition mechanism of the HMDS terminated m-Cresol inhibitor on coal spontaneous combustion was deduced.
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International Journal of Electrochemical Science
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2023
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IF 1.5
Fengshuang Han,Zhili Gong,Rui Wang,Sufang Dang
In this manuscript, the ability of (5-Benzoyl-1H-benzimidazol-2-yl) carbamicacidmethylester (mebendazole, MBD) as an inhibitor of corrosion on 5Cr pipeline steel in HCl medium was explored. Corresponding electrochemical tests, immersion tests and other experiments were designed, and at the same time, the ability of mebendazole to inhibit corrosion of 5Cr steel in HCl medium was screened and proved by means of molecular weight simulation calculation analysis process, and its possible anticorrosion mechanism was also revealed. Electrochemical test results show that mebendazole can successfully prevent 5Cr steel from dissolving in HCl medium, and the inhibition efficiency is particularly significant with the increase of mebendazole content. According to the electrochemical impedance test, the highest corrosion inhibition efficiency ( η ) can reach 94.4 %. The results of immersion weight loss experiment are highly consistent with the electrochemical test data and SEM electron microscope morphology. From the theoretical calculation results, it can be found that under neutral conditions and protonated mebendazole molecules have lower energy gaps and higher dipole moments in solvated and unsolvated environments, and can Parallel adsorption on the metal surface, which also corresponds to its efficient corrosion inhibition performance. In addition, through comparison, it is found that the protonated mebendazole molecule under solvation conditions has the highest binding energy, that is, it is the easiest to interact with 5Cr steel and presents the best anti-corrosion performance.
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JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Jingbao Wang,Jingmao Zhao,Mohammad Tabish,Fan Shi,Qi Cheng,Lijun Peng
The application of inhibitor as an efficient method to protect Zn Mg Al (ZMA) coated steel is first reported in this work. The inhibition performances of newly synthesized cerium gluconate (CG) for ZMA coated steel in 0.05 M NaCl solution were investigated by scanning electron microscopy (SEM), X-ray photoelectron spectroscope (XPS), electrochemical impedance spectroscopy (EIS) measurements, potentiodynamic polarization (PDP) measurements and neutral salt spray (NSS). The synthesized CG exhibits excellent inhibition efficiency of 98.4% at 200 ppm, which is much better than the individual or combined use of sodium gluconate (SG) and cerium (III) nitrate hexahydrate (CNH). Additionally, CG shows long-term protection for ZMA coated steel. A synergistic inhibition model between Ce oxide/hydroxide precipitation with CG adsorption film is proposed based on the obtained results. This work offers a promising option for the corrosion protection of ZMA coated steel.
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JOURNAL OF SOLID STATE CHEMISTRY
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2022
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IF 3.656
Tao Zhang,Qinggang Li
NH 4 VO 3 is an important vanadium source for the preparation of VO 2 . In the previous studies, the extra gas or solid reagents consumption is necessary for the preparation of VO 2 by using NH 4 VO 3 as vanadium source. The current work proposed a facile way for the fabrication of VO 2 (M) by the thermolysis of NH 4 VO 3 under the sealed atmosphere without extra gas or solid reagents consumption. The VO 2 (M) could be successfully synthesized by two step—thermolysis of NH 4 VO 3 at 400 °C under the sealed condition and heat treatment of VO 2 (B) at 500 °C under the N 2 condition. The dosage of NH 4 VO 3 and decomposition temperature had significant influences on the thermolysis process under the sealed condition. The NH 3 produced by the thermolysis provided a protective atmosphere that prevented the oxidization of VO 2 (B) by residual O 2 in the sealed reactor. Furthermore, the VO 2 (M) could be prepared directly under the sealed atmosphere by increasing reaction temperature to 700 °C. In this process, NH 4 VO 3 underwent a phase transition as the follows: NH 4 VO 3 →ammonium vanadium bronze→VO 2 (B)→VO 2 (M). The directly synthesized VO 2 (M) at 700 °C by the thermolysis of NH 4 VO 3 under the sealed condition showed great environmental stability and phase transition performance.
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IONICS
·
2023
·Vol. 29
·期 11
·4825-4833
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IF 2.8
Yu Dan,Dong Seng,Liu Qian,Jia Weiyi,Gao Faming,Wang Yatao
The preparation of platinum-free electrocatalysts with ideal oxygen reduction reaction (ORR) activity is of great significance for cost-effective fuel cells. Herein, we synthesize a series of Pd-based (PdFe, PdCo, PdNi, and Pd) nanowires (PdM NWs). Their diameters are about 10 nm. And the lengths are up to even micrometers. The mass activity of the series of Pd-based catalysts followed the descending order: PdNi NWs/C > commercial Pt/C > PdCo NWs/C > PdFe NWs/C > pure Pd NWs/C. The optimal half-wave (E 1/2 ) of PdNi NWs/C (839 mV) is positive shift 138 and 25 mV compared with pure Pd NWs/C (701 mV) and commercial Pt/C (814 mV), respectively. The mass activity (MA) of PdNi NWs/C only dropped 28% after 10,000 potential cycles between 0.6 and 1.1 V versus RHE in acid medium. This work provides a promising and reliable strategy to synthesize high performance Pd-based electrocatalyst, which is promising alternative to expensive Pt-based electrocatalysts for fuel cells. Graphical Abstract TOC: We prepared bimetallic PdNi nanowires, which ORR mass activity higher than pure Pd nanowires and commercial Pt/C in acidic medium.
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CHEMISTRY-A EUROPEAN JOURNAL
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2021
·Vol. 27
·期 21
·6538-6544
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IF 5.236
Yi Huang,Le Gao,HaoHai Yu,Zhihua Yang,Junjie Li,Shilie Pan
Graphical Laser damage limitation : Promising ternary infrared nonlinear optical (NLO) materials, Na 6 MQ 4 (M=Zn, Cd; Q=S, Se), with unique [NaQ 4 ] NLO-active groups, are successfully prepared. Theoretical calculations and statistical analyses indicate that the second-harmonic generation effect and band gap in the compounds originate mainly from the distorted NaQ 4 NLO-active units with a short Na−S bond length. Four sodium-based ternary IR nonlinear optical (NLO) materials, Na 6 MQ 4 (M=Zn, Cd; Q=S, Se), were prepared through a high-temperature flux method. The crystal structure of the compounds is built up of isolated [MQ 4 ] tetrahedra and a 3D framework formed by the NaQ n ( n =4, 5) units. The two selenides, Na 6 MSe 4 (M=Zn, Cd), as promising IR NLO materials, show moderate second-harmonic generation (SHG) responses (0.9 and 0.5×AgGaS 2 ) with good phase-matching behavior, as well as high laser damage thresholds (2 and 1.9×AgGaS 2 ). The two sulfides, Na 6 MS 4 (M=Zn, Cd), exhibit higher laser damage thresholds (13 and 4×AgGaS 2 ), but smaller SHG responses (0.3 and 0.2×AgGaS 2 ). Theoretical calculations and statistical analyses indicate that the SHG effect and band gap in the compounds originate mainly from the distorted NaQ 4 NLO-active units with a short Na−S bond length, which provides a new insight into the design of novel IR NLO materials.
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PubMed
高影响因子
COMBUSTION AND FLAME
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2020
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IF 4.57
De-Yun Tang,Zhi-Min Fan,Guangcheng Yang,Yinglei Wang,Pei-Jin Liu,Qi-Long Yan
Aluminum (Al) has been widely used in solid composite propellants (SCPs) to increase the specific impulse. However, Al always subjects to coalescence , sintering to large agglomerations during combustion of SCPs resulting in larger two-phase flow losses. Herein, core-shell μ-Al@M(IO 3 ) x composites have designed and synthesized as a replacement for micron-sized Al (μ-Al) in the Al/AP/RDX/HTPB propellant with tunable combustion behavior. The results show the thermal reactivity and heat releases of SCP are largely enhanced by using these novel metal-based composites. With the inclusion of μ-Al@EGCG@Fe(IO 3 ) 3 (EGCG: Epigallocatechin gallate), the major exothermic peak is reduced by 29.1 °C compared to the reference propellant with a heat release increase up to 5475 J g −1 , exceeding that of the reference sample (86 J g −1 higher). The burn rates are increased with the inclusion of μ-Al@(MIO 3 ) x , while the pressure exponent is higher. The SCP-1 (0.3), SCP-2 (0.18) and SCP-4 (0.25) that have relatively low pressure exponent and high burn rates are good candidates for future applications. The major condensed combustion products (CCPs) of these SCPs are Al 2 O 3 , Al 2.81 O 3.56 N 0.44 , Al 4 C 3 , Al 2 OC, AlN and C 7 H 18 ClN. The agglomeration can be reduced with a minor inclusion of μ-Al@M(IO 3 ) x due to the enhanced interfacial reactions, and the average CCP sizes (0.5 μm for SCP-1 and SCP-4) are even smaller than that of initial μ-Al (1.2 μm).
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ChemCatChem
·
2021
·Vol. 13
·期 22
·4814-4823
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IF 5.686
Desen Fu,Xiaoxia Wu,Beilei Cui,Yonghua Guo,Hua Wang,Jinyu Han,Qingfeng Ge,Xinli Zhu
Graphical Solid solution : In contrast to unselective Ru/SiO 2 , solid solution derived Ru 0.05 Ce 0.95 O 2 selectively catalyzes deoxygenation reaction to toluene with significantly inhibited C−C hydrogenolysis and hydrogenation reactions. The Ru−O V −Ce sites are the active sites for deoxygenation, and the inhibition of C−C hydrogenolysis and hydrogenation is due to the reduced Ru ensemble size in the solid solution. Selective hydrodeoxygenation (HDO) of biomass lignin-derived phenolic compounds to aromatics is a demanding reaction. Oxophilic Ru based catalysts can catalyze direct deoxygenation but suffer from competing C−C hydrogenolysis to CH 4 at 350 °C and hydrogenation of phenyl ring at 250 °C under atmospheric pressure. In this work, a solid solution Ru 0.05 Ce 0.95 O 2 catalyst was hydrothermally synthesized, characterized and tested for HDO of m-cresol. The Ru species is highly dispersed in the solid solution as isolated atoms and/or subnanometer clusters as a result of strong Ru−O−Ce interaction, and the catalyst shows high concentration of oxygen vacancies. In contrast to nonselective Ru/SiO 2 , Ru 0.05 Ce 0.95 O 2 selectively catalyzes deoxygenation to toluene while significantly inhibits C−C hydrogenolysis and hydrogenation. Moreover, the overall intrinsic HDO rate on Ru 0.05 Ce 0.95 O 2 is 2.2 and 8.8 times higher than those on Ru/CeO 2 and Ru/SiO 2 , respectively. The Ru−O V −Ce sites were proposed to be the active sites for deoxygenation. Inhibition of C−C hydrogenolysis and phenyl hydrogenation can be ascribed to the reduced size of the Ru ensembles due to the strong interaction in the solid solution.
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SENSORS AND ACTUATORS B-CHEMICAL
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2019
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IF 6.393
Chunsong Lu,Jie Liu,Lanlan Gan,Xiaoming Yang
Distinguishing the isomers is considered to be challenging, and shows the great importance in the biochemical and pharmaceutical fields. Herein, the blue carbon dots (CDs) were successfully raised on the basis of a facile hydrothermal way, since Cryptococcus served as the carbon source. Importantly, the as-prepared CDs were employed to achieve the differentiation and detection of two benzenediols. To be specific, the fluorescence of CDs was enhanced once m -benzenediol (resorcinol) was added, while introducing p -benzenediol (hydroquinone) lead to their fluorescence quenching. Towards the mechanism, the addition of m -benzenediol promoted the formation of hydrogen bonds between m -benzenediol and CDs, and thus resulting in their enhanced fluorescence. In contrast, the fluorescence quenching occurred due to the electron transferring from the rich-electrons of CDs to p -benzoquinone, when p -benzenediol was oxidized to be p -benzoquinone. Therefore, a differentiating strategy of two isomers has been proposed, and also contributed to detecting m -benzenediol and p -benzenediol concentrations in the ranges of 2 × 10 −3 to 1 × 10 −7 M and 2 × 10 -5 to 2 × 10 -9 M, respectively. Although there already existed the high performance liquid chromatography and other chemical methods for determining benzenediols, the current strategy provided a new way of distinguishing and assaying the isomers of benzenediols.
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JOURNAL OF MOLECULAR STRUCTURE
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2019
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IF 2.12
Lijuan Huang,Xin Zhang,Zhuoyong Zhang
Terahertz time-domain spectroscopy (THz-TDS) provides a novel approach for the coordination compounds characterization. In this paper, the THz absorption spectra of iron complexes and M-EDTA (M = Cd 2+ , Cu 2+ , Ni 2+ , Co 2+ , Fe 2+ , Fe 3+ , Mn 2+ , Cr 3+ ) complexes were investigated. Comparing to the infrared (IR) spectra of those compounds, the THz spectra can provide unique chemical and intermolecular vibrational information. The M − O and M − N vibrational modes in the THz-TDS spectra of M-EDTA complexes reveal the vibrational information of intermolecular interactions . Characteristic absorption bands in the THz spectra of various complexes and ligands are observed. THz absorption spectra of iron complexes and different ligands exhibited characteristic absorption bands in 0–2.2 THz region. These characteristic bands can be used to characterize and identify different complexes and ligands. The molecular vibrational information in the THz spectral band provides the unique fingerprint for further study of coordination compounds identification and structure characterization.
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