文献检索
检索与阿拉丁产品相关的同行评审论文、DOI、PubMed 编号、期刊、作者、CAS 号及研究领域。
科研影响力快照
在搜索之前,这些指标可帮助访客快速了解产品关联科研的规模与质量。
参考指标 指标基于阿拉丁文献引用数据库及期刊影响因子记录。文献关联仅供科研参考,请以原始文献为准。
The zinc–air battery is a promising energy device because of its high energy density and high safety. Developing efficient electrocatalysts for the oxygen reduction reaction (ORR) in air electrode is of great importance for high-performance zinc–air batteries. Herein, we first report N, P and Fe-tridoped nanoporous carbon ORR electrocatalysts derived from plant biomass corn silk. It is a cheap, accessible and recyclable biomass, which can offer a good basis for developing catalysts with low-cost and high yield production. The electrocatalysts were prepared by a hydrothermal process and a two step heat treatment process. The Fe element doped in the catalyst mainly came from FeCl3 and the P element came from corn silks. The N was from NH3 and corn silks. The biomass-derived catalyst exhibited a remarkably higher ORR activity, superior stability and tolerance to methanol poisoning effects in alkaline media than Pt/C catalyst. The catalyst also showed higher voltage and higher specific capacity than the Pt/C in a zinc–air battery and it may be an alternative to Pt/C in the practical application of the zinc–air battery. This study showed the possibility for rational design and preparation of high-performance electrocatalysts with a low-cost from a highly available and recyclable plant biomass.
α-Fe/FeTiO 3 /TiO 2 was synthesized through the reduction of Fe 3 O 4 @TiO 2 at 800 °C, and subsequently nitrided in NH 3 atmosphere at the nitridation temperature T N = 400, 600, 800 and 1000 °C. In the crystal lattice of TiO 2 , with increasing T N , the N element itself exhibits the chemical states of TiO 2-x N x , TiN and interstitial N, and simultaneously it induces the complex variation of the chemical state of the Ti and O elements. The photocatalytic performance of the nitrided samples is not determined only by the chemical states of the N element but by the synergistic effects of chemical states of the N, Ti and O elements.
Electrochemical hydrogen production through water splitting is one of the most promising methods for the storage and utilization of renewable energy. However, it is hindered by the sluggish oxygen evolution reaction (OER). Therefore, there is an urgent need to develop an efficient and robust OER catalyst through a simple and low-cost method. Herein, we report the in situ fabrication of amorphous Fe–NiSe/NF without a polymeric binder as a three-dimensional (3D) nanowire electrode for efficient water oxidation. It shows good durability in 1 M KOH. This catalyst requires overpotentials of only 233 and 275 mV to drive current densities of 10 and 100 mA cm−2, and it shows a low Tafel slope of 48 mV dec−1. The faradaic efficiency of Fe–NiSe/NF for oxygen evolution was determined to be close to 96.8%.
In this work, a novel catalyst in form of Fe, Co bimetallic alloy activated N-doped graphitic carbon layers (NC/Fe 10-x Co x ) without metal core is rationally fabricated through a simple pyrolysis method and applied for efficient oxygen reduction reaction (ORR) catalysis. The NC/Fe 10-x Co x catalysts have exhibited superior electrocatalytic ORR performance comparable to commercial Pt/C via a four-electron pathway under the same loading in alkaline media with outstanding durability and complete methanol tolerance. The improvement of ORR performance can be attributed to the synergistic effect of Fe, Co bimetallic activation on nitrogen-doped graphitic carbon layers, rich pore structure and uniformly dispersed dopants in the carbon matrix.
The baseline separation of divinylbenzene (DVB) and ethylvinylbenzene (EVB) isomers was achieved using HPLC with MIL-53(Fe) and MIL-100(Fe) packed columns respectively when hexane/dichloromethane (100:0) used as mobile phase, at flow rate of 0.5 mL min −1 , room temperature, and monitored with a UV detector at 254 nm. The two Fe-based MILs packed columns showed different separated performances, analytes had short retention time on MIL-100(Fe) compared to MIL-53(Fe), but selectivity of DVB isomers (m-DVB and p-DVB) was lower, which was mainly due to the differences of the pore size and structure of MILs. Moreover, the results of calculated thermodynamic parameters showed that the separation of DVB and EVB isomers was not only controlled by enthalpy change (ΔH), but also controlled by entropy change (ΔS). The head-to-tail stacking was the main reason for the separation according to the mechanism of the DVB and EVB isomers on Fe-based MILs packed columns.
Photocatalysis based on metal-organic frameworks (MOFs) is being actively investigated as a potential technology in visible light harvesting and utilizing processes. Herein we report that MIL-53(Fe), an earth-abundant Fe-containing MOF material, shows photocatalytic activity for the degradation of Acid Orange 7 (AO7) from aqueous solution under visible LED light irradiation, yet the photocatalytic performance of bare MIL-53(Fe) was not satisfactory due to the fast recombination of photoinduced electron-hole pairs. This can be effectively overcome by adding the external electron acceptor (e.g., persulfate, PS) to the catalytic process. The accelerated photocatalytic degradation of AO7 is demonstrated by the result that the degradation efficiency of AO7 in the MIL-53(Fe)/PS/Vis process reached almost 100% within 90 min as compared to only 24% under the identical experimental conditions for the MIL-53(Fe)/Vis process. To investigate the mechanism of the MIL-53(Fe)/PS/Vis process, photoluminescence (PL) spectra, electrochemical measurements and electron paramagnetic resonance (EPR) analysis were performed. It was concluded that the efficient separation of photogenerated electrons and holes by the introduced PS and the subsequent formation of reactive radicals resulting from the activation of PS by photogenerated electrons accounted for the accelerated photocatalytic degradation of AO7 in the MIL-53(Fe)/PS/Vis process. Furthermore, the applicability of MIL-53(Fe) used in the persulfate-mediated photocatalytic process was systematically investigated in terms of the identification of reactive radicals, the reusability and stability of the photocatalyst, as well as the effect of operating parameters. The findings of this work highlighted the great potential of MOFs as photocatalysts and elucidated a new opportunity for persulfate remediation of contaminated water.
The development of non-noble metal catalysts is of great interest due to their significant potential application in both fuel cell system and metal-air batteries, particularly when considering long term commercial deployment. Fe/N/C is a promising non-Pt electrocatalyst for the oxygen reduction reaction (ORR), but its catalytic activity is considerably inferior to that of Pt in acidic medium. In this paper, an improved Fe/N/S/C catalyst (denoted as Fe–N–S/C) is presented. Nitrogen-sulfur-iron-doped porous carbon material is synthesized by the pyrolysis of dicyandiamide, a kind of abundant and inexpensive compound, with thiourea as additional sulfur source in argon atmosphere. The Fe–N–S/C shows excellent performance for the ORR with the onset and half-wave potential at 0.89 and 0.78 V (vs.RHE) in 0.1 M H 2 SO 4 solution, respectively, which are significantly higher compared to those of the catalysts derived from only dicyandiamide (0.85 and 0.75 V). Our results indicate that as compared to the commercial 20 % Pt/C catalyst, the synthesized catalyst exhibits not only higher current density and long-term durability but also higher tolerance to methanol poisoning. More importantly, the synthetic method is simple and inexpensive.
Here, the cathodic electrochemiluminescence (ECL) behavior of 3,4,9,10-perylenetetracar-boxylic acid (PTCA) coreacted with hydrogen peroxide was firstly reported. The quenching effect of Fe-MIL-88 MOFs (iron based metal-organic framework) on the ECL of PTCA was found, and the ECL quenching mechanism was investigated, which was speculated to be via the resonance energy transfer from PTCA to Fe-MIL-88 MOFs and steric hindrance effect from Fe-MIL-88 MOFs. Combining with dual molecular recognition strategy and the quenching effect of Fe-MIL-88 MOFs on the ECL of PTCA-H 2 O 2 system, an “on-off” ECL sensor was designed to detect dopamine (DA) with a broad linear range (five orders of magnitude). The detection limit was low to 2.9 × 10 −13 M. The PTCA-H 2 O 2 system would provide a new ECL platform, especially for constructing enzyme based ECL sensor with H 2 O 2 as product in enzymatic reaction. Furthermore, the electrochemiluminescence resonance energy transfer between Fe-MIL-88 metal–organic framework and PTCA would expand a new application of Fe-MIL-88 MOFs in ECL field. The dual molecular recognition strategy ensured the selectivity of the sensor for DA detection.
In this paper, three kinds of HZSM-5-supported transition metal (Cr, Fe, and Cu) oxide catalysts were prepared by the wet impregnation method, and their stability performances for catalytic combustion of dichloromethane (DCM) were investigated. Different behaviors were observed for these three catalysts during a 300 min catalytic reaction running at 320 °C. It was found that the Cr–O/HZSM-5 catalyst showed good catalytic stability, while both Fe–O/HZSM-5 and Cu–O/HZSM-5 suffered obvious deactivation. Characterizations using XRD, BET, XPS, O2-TG, O2-TP-MS, NH3–IR, and temperature-programmed surface reaction (TPSR) techniques were then carried out to disclose the deactivation mechanisms. The results revealed that the main cause of the deactivation over the Fe–O/HZSM-5 catalyst was coke formation, which could be mainly attributed to its lower deep oxidation capacity of the intermediate products, i.e., the methoxy groups, and it could also be obtained that the Cu–O/HZSM-5 catalyst was severely poisoned by chlorine species owing to the formation of stable Cu(OH)Cl species. Based on the results above, it could be concluded that the close proximity and synergy between acidic sites and active oxygen species were crucial to avoid coke deposition during the chlorinated volatile organic compound catalytic oxidation process.
The unreasonable use of organophosphorus pesticides leads to excessive pesticide residues in food, seriously threatening public health, and the potential of surface-enhanced Raman spectroscopy (SERS) technology, incorporating a metal–organic framework, is substantial for the rapid detection of trace pesticide residues. Here, a novel Fe 3 O 4 @NH 2 -MIL-101(Fe)@Ag (FNMA) SERS nanosensor was developed. Results indicated that the FNMA had a high enhancement factor of 1.53 × 10 8 , a low limit of detection (LOD) of 4.55 × 10 −12 M, and a relative standard deviation of 7.73 % for 4-nitrothiophenol, demonstrating its good SERS sensitivity and uniformity, and also possessed good storage stability for one month. In quantifying fenthion and methyl parathion in standard solutions and apple juice in the range of 0.05/0.02–20 mg/L, it showed LODs of 3.02 × 10 −3 mg/L and 1.43 × 10 −3 mg/L, and 0.0407 and 0.0075 mg/L, respectively, demonstrating potentials in ultrasensitive trace detection of pesticides in food.
A novel porous Fe-Mn chitosan bead (PFMB) was fabricated through the freeze-drying technique for the enhanced oxidation and adsorption of arsenite (As(Ⅲ)) from aqueous solution. The porous internal structure of PFMB provided a significantly higher As(Ⅲ) oxidation and adsorption rate than solid Fe-Mn chitosan bead (FMB). The experimental results showed that FMB and PFMB exhibited the theoretical maximum As(Ⅲ) adsorption capacities of 27.42 and 49.80 mg/g, respectively. The real-time oxidation and adsorption progress of As(Ⅲ) onto PFMB was deeply evaluated: PFMB effectively oxidized As(Ⅲ) to As(Ⅴ) and the generated As(Ⅴ) was subsequently adsorbed. The operational parameters (initial pH, adsorbent dosage, ionic strength, and HA concentration) were thoroughly investigated and had no significant influence on As(Ⅲ) removal by PFMB. Finally, the regeneration experiment showed that PFMB can be easily regenerated and the recycled PFMB can successfully remove As(Ⅲ) in the following 5 cycles. Column experiments suggested that the column device could effectively remove the As(Ⅲ) in more than 3830 bed volume with the influent velocity at 0.5 mL/min before effluent concentration reached 0.05 mg/L. These results revealed the enhanced oxidation and adsorption performance of As(Ⅲ) onto PFMB and provided a reference for the future application of PFMB in arsenic-contaminated water treatment.
文献关联基于可获得的产品、CAS、DOI 及引用记录。收录不代表作者或出版方对阿拉丁产品的背书,请以原始文献为准。
危险品化学品经营许可证（带存储）