CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Jinwen Hu,Xiangbin Cai,Jiao Wu,Cuncun Xin,Jingya Guo,Ziruo Liu,Jiazhen Wei,Xusheng Cheng,Ce Hao,Haopeng Dong,Guifeng Zhang,Ning Wang,Yongpeng Lei,Wei Liu,Yantao Shi
Endowing the transition-metal-nitrogen-carbon (M-N-Cs) electrocatalysts with high oxygen reduction activity for sustainable energy conversion, is a field of intense research while remains elusive. Here we exploit the variable configuration of atomically dispersed Cu 1 centers on carbon support via rationally constructing prototypical CuN 2+2 active sites to boost the kinetically sluggish electrochemical oxygen reduction. Density functional theory reveals the modified electronic structure of active Cu site and its derived orbital overlap through right symmetry with the degenerate π* orbital of O 2 molecule, which more effectively facilitates O 2 activation compared with CuN 4 counterpart. The targeted electrocatalyst delivers superior alkaline ORR activity with a half-wave potential of 0.88 V and superior kinetics with Tafel slope of 48 mV dec −1 , outperforming those of benchmark Pt/C. Remarkably, further demonstrated excellent peak power density and long-term durability in both primary liquid and flexible solid-state Zn-air battery assemblies signify the potential for practical applications.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2016
·Vol. 163
·期 13
·F1309
·
IF 3.014
Xiaojing Chen,Wen Wen,Jing Hu,Hejia Su,Haibin Li,Xiangyang Kong,Marta Boaventura
Based on CsH5(PO4)2, sulfonated poly(ether ether ketone) (SPEEK), and phosphosilicate sol, proton-conducting CsH5(PO4)2/phosphosilicate/SPEEK composite electrolyte membranes have been prepared by a sol–gel method followed by mechanical ballmilling. The chemical structures, morphologies, thermal performances, stability, and proton conductivities of the composite electrolyte membranes were investigated. After incorporating the SPEEK polymer, these composite membranes exhibited adequate flexibility and mechanical performance; despite inorganic content of up to 80 wt%, a tensile strength of 6.2 MPa was maintained. Specifically, the composite electrolyte membrane displays a high proton conductivity of 14.6 mS cm−1 at 250°C under 47% H2O/N2 atmosphere. A fuel cell equipped with the composite electrolyte membrane showed a stable output voltage over the continuous measurement of 50 h under a constant output current density of 40 mA cm−2.
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高影响因子
JOURNAL OF RARE EARTHS
·
2018
·
IF 2.524
Yaqian Chen,Huanping Wang,Xiaoting Zhang,Zhen Xiao,Qinghua Yang,Ruoshan Lei,Degang Deng,Lihui Huang,Shiqing Xu
(Y 0.87 La 0.1 Zr 0.03 ) 2 O 3 nanopowders doped with various concentrations of Tm 3+ and Ho 3+ were prepared by the citrate method. The standard cubic Y 2 O 3 phase can be matched in the Tm 3+ /Ho 3+ co-doped (Y 0.87 La 0.1 Zr 0.03 ) 2 O 3 nanopowders. The nanopowders exhibit average particle sizes of 40, 60, 80 and 100 nm after calcinated at 900, 1000, 1100 and 1200 °C, respectively. The energy transfer from Tm 3+ to Ho 3+ and the optimum fluorescence emission around 2 μm were investigated. Results indicate that the emission bands at around 1.86 and 1.95 μm correspond to 3 F 4 → 3 H 6 transition of Tm 3+ and 5 I 7 → 5 I 8 transition of Ho 3+ , respectively. Better spectral properties were achieved in Tm 3+ /Ho 3+ co-doped (Y 0.87 La 0.1 Zr 0.03 ) 2 O 3 nanopowders with the average size of 100 nm obtained at the conditions of the treatment of precursors calcinated at 1200 °C for 2 h doped with 1.5 mol% Tm 3+ and 1 mol% Ho 3+ .
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高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2023
·
IF 3.5
Yichen Ye,Yongbao Xiao,Yao Ji,Weichao Wang
Singly Ho 3+ -doped TeO 2 –Ta 2 O 5 –ZnO (TTZ) glass and optical fiber for 2 μm fiber lasers have been investigated. The glass-forming region of the ternary TTZ glass system is determined to study its glass-forming ability and to select an appropriate glass matrix for doping Ho 3+ ions. Upon the excitation of a 1940 nm laser diode (LD), an intense emission at 2.06 μm with a full width at half maximum (FWHM) of 61 nm is observed from the Ho 3+ -doped TTZ glass. The measured lifetime of the Ho 3+ : 5 I 7 level in TTZ glass shows a gradual decrease from 3.5 to 0.98 ms as the dopant concentrations increase from 0.2 to 2 mol%. A large emission cross-section (σ e MC ∼ 4.56 × 10 −21 cm 2 ) and figure of merit (FOM, ∼ 6.83 × 10 −24 cm 2 ·s) are obtained. The Ho 3+ -doped TTZ glass is further fabricated into an optical fiber with an average transmission loss of 0.12 dB/cm at 1310 nm. The results show that singly Ho 3+ -doped TTZ glass and optical fiber are promising candidates for efficient 2 μm fiber lasers.
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高影响因子
Journal of the American Chemical Society
·
2019
·
IF 14.695
Zhong-Xia Wang,Yi Zhang,Yuan-Yuan Tang,Peng-Fei Li,Ren-Gen Xiong
Antiperovskites have developed to be one kind of important functional material over the past few decades, showing abundant physical properties such as negative thermal expansion and superconductivity, etc. However, antiperovskite ferroelectrics have scarcely been discovered in inorganic ceramics. In this article, we report a new organic–inorganic hybrid antiperovskite ferroelectric [(CH3)2(F-CH2CH2)NH]3(CdCl3)(CdCl4) based on the strategy of molecular design. The replacement of one methyl in [(CH3)3NH]CdCl3 with ethyl produces the lower symmetric [(CH3)2(CH2CH3)NH]CdCl3 with nonpolar perovskite structure, while the polar hexagonal antiperovskite structure with the formula of X3BA (where X = [(CH3)2(F-CH2CH2)NH]+, B = [CdCl3]−, and A = [CdCl4]2–) was received after further fluoridation of the ethyl group. Therefore, fluoridation successfully achieves the structural transformation from perovskite to antiperovskite, as well as the significant changes in physical properties from nonferroelectric to ferroelectric. The antiperovskite [(CH3)2(F-CH2CH2)NH]3(CdCl3)(CdCl4) exhibits typical ferroelectric phase transition above room temperature (Tc = 333 K) including thermal anomalies, dielectric transitions, and second harmonic generation (SHG) responses. Moreover, lower coercive fields and easy polarization switching are observed by the measurements of hysteresis loops and ferroelectric domains. The saturated polarization (Ps) of 4.0 μC/cm2 is almost 10 times as large as those recently discovered antiperovskite molecular ferroelectrics. This finding provides a novel strategy to design and explore more antiperovskite organic–inorganic hybrid ferroelectric materials.
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高影响因子
TEXTILE RESEARCH JOURNAL
·
2022
·
IF 2.455
Xun Zhang,Sarkodie Bismark,Zhifeng Zhu
Tertiary amine groups can exhibit and lose cationic properties at different pH levels, and this group can be introduced to starch chains to satisfy the demand for sizing and desizing. However, the effect of pH on tertiary amine groups in toughening starch film and improving adhesion is still unclear. Therefore, 2-dimethylaminoethyl starch (DMAES) was prepared via tertiary aminated starch with 2-dimethylaminoethyl chloride hydrochloride. The influences of pH on the mechanical properties of DMAES films and the adhesion to cotton fiber were investigated. In addition, the desizability and biodegradability of DMAES were measured. It was found that introducing the group of 2-dimethylaminoethyl could toughen the starch film and increase the adhesion to cotton fiber. DMAES has a higher zeta potential and the adhesion to cotton fibers in acidic conditions than in alkaline conditions. In addition, it is easy to remove the DMAES from the yarns and obtain higher desizing efficiency with alkali desizing. Tertiary amination of starch with the 2-dimethylaminoethyl group was a good way for starch to improve adhesion and obtain a higher desizing efficiency.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Lanxingyu Liu,Xingtao Zuo,Jiajie He,Yun Zhou,Juan Xiong,Cong Ma,Zhongbing Chen,Shuili Yu
The preparation of high-performance nanofiltration membranes with high permeability and selectivity is a great challenge. Herein, we proposed 2-Aminophenol-4-sulfonic acid (APS) and piperazine (PIP) co-deposition for the first time through the interfacial polymerization (IP) with trimesoyl chloride (TMC) to form a polyamide (PA) layer. APS-incorporated membrane had a thinner active layer (20–60 nm), larger pore size and smoother membrane surface as well as strengthened electronegative feature. The pure water permeability of the membranes reached 5.8 times that of the control membrane, up to 70.8 LMH/bar with 96.4% rejection for RB, 99.0% rejection for BSA and SA , respectively. More importantly, the optimal membrane showed pure water flux of 22.9 LMH/bar as well as 95.9% Na 2 SO 4 rejection. The retention performance of the membrane also exhibited high dye rejections towards MB, NR, MO above 93.6%, especially 98.0%, 98.3% and 99.1% for CV, CR and RB, respectively. Almost complete removal was achieved for natural organic matters (≥99.7%) in the meanwhile. Significantly, long-term performance stability of the APS-integrated membrane was demonstrated during the 120-h continuous filtration of dye, NOM, and salt solution, respectively. This work provides a loose nanofiltration membrane with regulatable structural morphology for water desalination, surface water and wastewater treatment .
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高影响因子
Energy Science & Engineering
·
2019
·Vol. 7
·期 3
·881-889
·
IF 2.893
Yanjie Zhu,Yang Yang,Xiaoguang Wang,Heng Zhong,Fangming Jin
Conversion of CO 2 into useful chemicals has been regarded as one promising method to mitigate the problem of global warming. However, developing an efficient method for CO 2 reduction with facile hydrogen source is still a great challenge. In this study, a new and straightforward method to convert NaHCO 3 , a model compound of CO 2 in basic solution, into formate with 2-pyrrolidone, a model compound of protein-containing biomass, as the reductant on a Pd/C catalyst in water was proposed. Results showed that a formate yield up to 30% from bicarbonate was successfully obtained over the Pd/C catalyst, and the Pd/C catalyst exhibited good catalytic activity and stability. Detailed studies revealed that the propanol generated from the decomposition of 2-pyrrolidone under hydrothermal conditions acted as the actual reductant and hydrogen source for the bicarbonate reduction to formate. Since 2-pyrrolidone can be readily generated from the proteins contained in biomass, the present research provides a promising technology of NaHCO 3 reduction with biomass as the hydrogen source and the renewable energy input, thus it is green, sustainable, and promising for practical application.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 6
·062504
·
IF 4.386
Fangzhao Pang,Peng Li,Zhuqing Zhao,Lei Guo,Kaifa Du,Bowen Deng,Dihua Wang,Huayi Yin
Electrolysis of solid oxides in molten CaCl2 has been proven a straightforward process to extract various metals thanks to the wide electrochemical window of CaCl2 and CaO which is soluble in molten CaCl2. However, the CaO produced during the cathodic reduction of oxides not only shuttles O2−, but also captures CO2 to generate CO32− that can be reduced to carbon at the cathode, resulting in decreasing current efficiency and contaminating the cathodic products by carbon. To solve this problem, we employed CaSiO3 to replace CaO to suppress/avoid the formation of CO32− and thereafter prevent the carbon deposition. The suppression of CO32− formation is because SiO32− is thermodynamically more stable than CO32−, i.e., the CO2 generated on the graphite anode can not be captured by SiO32−. In molten CaCl2−8.0 wt% CaSiO3, Cr2O3 and SiO2 are reduced to Cr and Si with much less carbon deposition than in molten CaCl2. As a result, the current efficiency increases from 21.4% to 51.9% for the reduction of Cr2O3 and 37.1% to 72.2% for the reduction of SiO2. Although introducing SiO32− will slightly decrease the electrochemical window of CaCl2, it will be a promising method to avoid carbon contamination and increase current efficiency especially for Si production.
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高影响因子
RSC Advances
·
2021
·Vol. 11
·期 52
·32654-32670
·
IF 3.361
Chang Yu,Min Liang,Su-Yi Dai,Hai-Jun Cheng,Li Ma,Fang Lai,Xiong-Min Liu,Wei-Guang Li
Cinnamaldehyde, cinnamyl alcohol, β-methylstyrene and cinnamic acid are four important biomass 3-phenyl-2-propene compounds. In the field of perfume and organic synthesis, their thermal stability and oxidation pathways deserve attention. This paper reports a new attempt to investigate the thermal stability and reactivity by a custom-designed mini closed pressure vessel test (MCPVT). The pressure and temperature behaviors were measured by MCPVT under nitrogen and oxygen atmosphere. The temperature of initial oxygen absorption (Ta) and rapid oxidation (TR) were calculated. The results showed that four 3-phenyl-2-propene compounds were stable under nitrogen atmosphere. The Ta of cinnamaldehyde, cinnamyl alcohol, β-methylstyrene, and cinnamic acid was 271.25 K, 292.375 K, 323.125 K, and 363.875 K, and their TR was 301.125 K, 332.75 K, 357.91 K, and 385.375 K, respectively. The oxidation reactivity order was derived to be cinnamaldehyde > cinnamyl alcohol > β-methylstyrene > cinnamic acid. The oxidation kinetics were determined using n versus time (n–t) plots, which showed a second-order reaction. Peroxide was determined by iodimetry, and the oxidation products were analyzed by gas chromatography-mass spectrometry (GC-MS). The results showed that the peroxide value of cinnamaldehyde, cinnamyl alcohol, β-methylstyrene, and cinnamic acid reached 18.88, 15.07, 9.62, and 4.24 mmol kg−1 at 373 K for 6 h, respectively. The common oxidation products of four 3-phenyl-2-propene compounds were benzaldehyde, benzoic acid, and epoxide, which resulted from the carbon–carbon double bond oxidation. The substituents' oxidation products were obtained from the oxidation of cinnamaldehyde, cinnamyl alcohol, and β-methylstyrene. In particular, the difference is that no oxidation products of the carboxyl group of cinnamic acid were detected. The common oxidation products of the four 3-phenyl-2-propene compounds were benzaldehyde, benzoic acid, and epoxide, which resulted from the carbon–carbon double bond oxidation. The substituents' oxidation products were caught in the oxidation of cinnamaldehyde, cinnamyl alcohol, and β-methylstyrene. In particular, the difference is that no oxidation products of the carboxyl group of cinnamic acid were detected. According to the complex oxidation products, important insights into the oxidation pathways were provided.
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高影响因子
Chemistry-An Asian Journal
·
2015
·Vol. 10
·期 11
·2452-2459
·
IF 4.587
Yuepeng Pang,Yongfeng Liu,Xin Zhang,Qian Li,Mingxia Gao,Hongge Pan
Herein, an initial attempt to understand the relationships between hydrogen storage properties, reaction pathways, and material compositions in LiBH 4 – x Mg(AlH 4 ) 2 composites is demonstrated. The hydrogen storage properties and the reaction pathways for hydrogen release from LiBH 4 – x Mg(AlH 4 ) 2 composites with x =1/6, 1/4, and 1/2 were systematically investigated. All of the composites exhibit a four-step dehydrogenation event upon heating, but the pathways for hydrogen desorption/absorption are varied with decreasing LiBH 4 /Mg(AlH 4 ) 2 molar ratios. Thermodynamic and kinetic investigations reveal that different x values lead to different enthalpy changes for the third and fourth dehydrogenation steps and varied apparent activation energies for the first, second, and third dehydrogenation steps. Thermodynamic and kinetic destabilization caused by the presence of Mg(AlH 4 ) 2 is likely to be responsible for the different hydrogen desorption/absorption performances of the LiBH 4 – x Mg(AlH 4 ) 2 composites.
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高影响因子
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Zonghua Pu,Qian Liu,Abdullah H. Qusti,Abdullah M. Asiri,Abdulrahman O. Al-Youbi,Xuping Sun
The present communication reports on the first electrodeposition of Ni(OH) 2 on ZnO array supported on Ni foam. When applied as a binder-free electrode material for pseudocapacitive energy storage, the resulting ZnO@Ni(OH) 2 array exhibits a high specific capacitance of 2028 F g −1 at a current density of 10 A g −1 with good cycling stability. Meanwhile, the array exhibits a superb rate capability. Even at an extremely high current density of 100 A g −1 , the array still shows a very high specific capacitance of 1059 F g −1 .
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高影响因子
危险品化学品经营许可证（带存储）