PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2024
·
IF 2.9
Ruiqi Shao,Yingjie Dong,Qingqing Wu,Haiting Shi,Jinxi Bao,Feng Tian,Tianyu Li,Zhiwei Xu
The porous structure of composite nanofibers plays a key role in improving their electrochemical performance. However, the dynamic evolution of pore structures and their action during ion intercalation/extraction processes for negative electrodes are not clear. Herein, porous carbon composite nanofibers (Fe@Fe2O3/PCNFs) were prepared as negative electrode materials for potassium-ion batteries. Electrochemical test findings revealed that the composites had good electrochemical characteristics, and the porous structure endowed composite electrodes with pseudo-capacitive behaviors. After 1500 discharge/charge cycles at a current density of 1000 mA g−1, the specific capacity of the potassium-ion batteries was 144.8 mAh g−1. We innovatively used synchrotron small-angle X-ray scattering (SAXS) technique to systematically investigate the kinetic process of potassium formation in composites and showed that the kinetic process of potassium reaction in composites can be divided into four stages, and the pores with smaller average diameter distribution are more sensitive to changes in the reaction process. This work paves a new way to study the deposition kinetics of potassium in porous materials, which facilitates the design of porous structures and realizes the development of alkali metal ion-anode materials with high energies.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Jiqiong Lian,Yihui Wu,Houan Zhang,Siyong Gu,Zhiwei Zeng,Xiaoyun Ye
Design of inexpensive and highly efficient bifunctional electrocatalyst is paramount for overall water splitting . In this study, amorphous Ni–Fe–P alloy was successfully synthesized by one-step direct-current electrodeposition method. The performance of Ni–Fe–P alloy as a bifunctional electrocatalyst toward both hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) was evaluated in 30 wt% KOH solution. It was found that Ni–Fe–P alloy exhibits excellent HER and OER performances, which delivers a current density of 10 mA cm −2 at overpotential of ∼335 mV for HER and ∼309 mV for OER with Tafel slopes of 63.7 and 79.4 mV dec −1 , respectively. Moreover, the electrolyzer only needs a cell voltage of ∼1.62 V to achieve 10 mA cm −2 for overall water splitting. The excellent electrocatalytic performance of Ni–Fe–P alloy is attributed to its electrochemically active constituents, amorphous structure, and the conductive Cu Foil.
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DYES AND PIGMENTS
·
2021
·
IF 4.889
Yu Kuai,Tao Yang,Feiya Yuan,Yujie Dong,Qingbao Song,Cheng Zhang,Wai-Yeung Wong
A new metallo-supramolecular film was prepared by a liquid–liquid interface self-assembly method based on the metal ion Fe(II) in water solution and a star-shaped ligand of triphenylamine-substituted alkyl terpyridine in organic solvents . The film obtained exhibited excellent flexibility due to the presence of flexible alkyl arms, and could tightly adhere to the surface of ITO glass with very smooth surface morphology via SEM characterization. Spectroelectrochemical experiments demonstrated that the film displayed the electrochromism with purplish color in the neutralized state at 0 V vs Ag/AgCl turning to yellow-green color in the oxidized state at 1.2 V vs Ag/AgCl. This work further indicates that the liquid–liquid interfaciad self-assembly method is a promising strategy to prepare the metallo-supramolecular film towards electrochromic applications.
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ACS Applied Energy Materials
·
2022
·
IF 6.959
Shiwei Song,Yanhui Wang,Shuyu Zhou,Hongwei Gao,Xueqing Tian,Yungang Yuan,Wei Li,Jianbing Zang
Seawater is more favorable than freshwater in large-scale hydrogen production by electrolysis as it is considered to be the most plentiful natural resource. However, chloride ions with high concentrations in the electrolyte may easily cause corrosion to electrodes or undesirable side reactions during the implementation of seawater electrolysis, thereby degrading the overall system’s efficiency. Therefore, it is necessary to develop an electrocatalyst with excellent catalytic activity and corrosion resistance in order to achieve high-efficiency seawater electrolysis. In this study, a three-dimensional heterogeneous architecture of (FeNi)9S8 nanosheets uniformly decorated with an amorphous MoS2 layer on Ni-Fe foam (MoS2-(FeNi)9S8/NFF) was successfully prepared via one-step hydrothermal vulcanization. Benefiting from the strong interaction at the heterogeneous interface, effective charge transfer, and the enhanced corrosion resistance by MoS2-(FeNi)9S8 coupling, the self-supported MoS2-(FeNi)9S8/NFF electrocatalyst exhibited superior catalytic activity and stability toward overall fresh/seawater splitting. Moreover, it required a low battery voltage of 1.57 and 1.62 V to reach 50 and 100 mA cm–2 in an alkaline natural seawater electrolyte, respectively, and possessed impressive durability up to 72 h, exceeding the pair of Pt/C||IrO2. Accordingly, this study provides a route for the preparation of corrosion-resistant electrocatalysts of hydrogen production by seawater electrolysis.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2024
·Vol. 28
·期 8
·2547-2560
·
IF 2.6
Wan Huan,Wang Wei,Bu Lu-xia
In this study, Al-Fe and Al-Fe-Mn alloy anodes are prepared and examined. The influence of impurity Fe on the microstructure and properties of Al alloy anodes is investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD), and electrochemical testing techniques. The results reveal that the presence of impurity Fe in Al alloys significantly shifts the open-circuit potential of the Al anode towards the positive side and reduces its discharge efficiency. However, the adverse impact of impurity Fe is mitigated by alloying with Mn. Specifically, the open-circuit potential of Al-0.20%Fe-0.20%Mn anodes is observed to shift negatively by 70 mV when compared to that of Al-0.20%Fe in a 3 M KOH solution. Furthermore, the anode utilization of Al-0.20%Fe-0.20%Mn anodes, following continuous discharge at 30 mA·cm −2 and 100 mA·cm −2 for 30 min, is found to be 70% and 52% higher, respectively, than that of Al-0.20%Fe anodes. This highlights the effectiveness of Mn modification as a preferable approach to ameliorate the detrimental effects of impurity Fe.
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ELECTROANALYSIS
·
2023
·Vol. 36
·期 2
·e202300237
·
IF 3
Toleshi Teshome,Shimeles Addisu Kitte,Abera Gure,Guta Gonfa
The co-precipitation approach was employed in this study to create Fe doped ZnO (Fe-ZnO) nanoparticles (NPs). To characterize the synthesized NPs, Ultra violet-Visible (UV-Vis) spectroscopy, X-ray diffraction (XRD), fourier transform infrared (FT-IR), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET) were used. Here, a novel electrochemical approach for the detection of tryptophan (Trp) using a glassy carbon electrode modified with Fe-ZnO NPs (Fe-ZnO/GCE) is demonstrated. The research findings revealed that Fe-ZnO/GCE enhanced the electron transfer rate of Trp oxidation. The sensitivity of Trp detection using Fe-ZnO/GCE in phosphate buffer solution (PBS) at pH 64.0 was significantly improved compared to bare GCE due to the electrocatalytic activity of Fe-ZnO NPs. Fe-ZnO/GCE exhibited a linear response with Trp concentrations ranging from 0.1 to 150 μM with the limit of detection (LOD) is 0.089 μM (3σ /m ) and limit of quantification (LOQ) about 0.3 μM (10σ /m ) using linear sweep voltammetry (LSV). The Fe-ZnO/GCE sensor was also effectively used to detect Trp in African catfish and multivitamin tablets. Trp analysis in real samples exhibited good recovery values of 89.60 to 99.15 %, demonstrating the accuracy and practicality of the method.
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Journal of CO2 Utilization
·
2020
·
IF 5.993
Chengyi Dai,Xiao Zhao,Borui Hu,Xinbao Zhang,Qunxing Luo,Xinwen Guo,Xiaoxun Ma
Capturing and utilization of carbon dioxide (CO 2 ) not only leads to effective use of carbon resources, but also alleviates environmental pollution caused by increasing concentration of CO 2 , thus making it a hot research topic in recent years. In this study, a series of highly dispersed iron-cobalt (Fe-Co) catalysts was prepared by ethylenediaminetetraacetic acid disodium salt (EDTA-2Na) modification, which could efficiently convert CO 2 into high value-added chemicals (C 2 -C 4 = and C 5 -C 11 ). X-ray diffraction (XRD) analysis showed that the addition of a small amount of Co and EDTA-2Na contributed to enhance the sintering resistance of Fe species. During the calcination process, EDTA 4− can be decomposed into small organic molecules with reducibility, thus promoting the reduction of iron species. The CO temperature-programmed desorption (CO-TPD) results showed that cobalt enhanced the adsorption and activation of intermediate CO on Na x Fe-Co catalyst, thereby promoting the catalytic conversion of CO 2 . The complexation of EDTA promotes the synergistic effect of Fe-Co bimetals, enhances the chemical adsorption of CO 2 . Sodium in EDTA-2Na promotes the surface basicity of the catalysts, which is favored for improving the product distribution of hydrocarbons. At lower H 2 /CO 2 (1/1) ratio, the EDTA-2Na modified Fe-Co/Al 2 O 3 catalyst exhibited high conversion of CO 2 (32.8 %) and excellent selectivity toward high value-added chemicals. The selectivity of by-product CO was only 8.1 %; and C 2 -C 4 = (32.5 %) and C 5 -C 11 (46.3 %) accounted for ∼79 % selectivity among the hydrocarbons generated.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2021
·Vol. 97
·期 5
·1200-1206
·
IF 3.174
Xiaoyuan Ma,Xia Zhang,Jingchao Wang,Siyi Li,Tianyong Zhang,Shuang Jiang,Bin Li
BACKGROUND Dihydroxybenzene (DHB) is a common feedstock in the pharmaceutical and dyestuff industries, which can be prepared by hydroxylation of phenol. It has great potential to find a highly selective catalyst to promote this process. RESULTS Two novel model complexes, FeI 2 (CO) 2 DPPE ( 1 ) and FeI 2 (CO) 2 DPPP ( 2 ), were designed and synthesized, which mimic the active site of [Fe]-hydrogenase. IR and UV–vis spectroscopies and single-crystal X-ray diffraction were used to characterize the structures of complexes 1 and 2 . According to the IR spectra, complexes 1 and 2 have two cis -CO ligands, which is similar to the Fe-GP cofactor isolated from the enzyme. The single-crystal X-ray diffraction analysis of complex 1 revealed an angle of 93.7° between the two cis -CO ligands, confirming the structural similarity to the active site of natural [Fe]-H 2 ase. Complex 1 exhibits excellent catalytic properties in phenol hydroxylation, achieving 19.6% phenol conversion and 82.5% DHB selectivity under optimal conditions. CONCLUSIONS Complex 1 is an excellent candidate for mild phenol hydroxylation catalysis. Additionally, a proposed mechanism for hydroxylation catalyzed by complex 1 is presented. © 2021 Society of Chemical Industry (SCI).
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 37
·19757-19768
·
IF 14.511
Min Lu,Li An,Jie Yin,Jing Jin,Rui Yang,Bolong Huang,Yang Hu,Yong-Qing Zhao,Pinxian Xi
The electrochemical oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are key electrochemical processes in metal–air batteries and water splitting devices. Aluminium–air batteries, as an important type of metal–air battery, have been considered to be promising power candidates for flexible electronics. Here, we describe electronically engineered amorphous Fe–Co–S sites embedded in Prussian blue analogue (FeCoSx-PBA) hetero-nanoframes. The experimental results and DFT calculations reveal the critical role of the introduced FeCoSx layer to PBA, which enhances the electron transfer and alleviates the overbinding effect of OH* during the OER. The FeCoSx-PBA hybrid system supplies an optimized electronic structure for the alkaline OER, which is also confirmed by the much-lowered overpotential (266 mV at 10 mA cm−2) for the alkaline OER. Furthermore, a flexible Al–air battery based on an FeCoSx-PBA cathode catalyst exhibits a high peak power density (58.3 mW cm−2) and energy density (1483 W h kgAl−1), and outstanding stability for more than 50 h of operation under bending or stretching conditions, demonstrating its potential in the practical application of flexible electronic devices. Our results may provide a new strategy of modulating the electronic structure of air electrode catalysts to efficiently promote the reactivity of alkaline OER and Al–air battery processes.
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Materials Today Energy
·
2021
·
IF 7.311
Xingpeng Gao,Yingying Hu,Wenping Zha,Yanpei Li,Jingyi Wang,Hongjian Lai,Xiangwei Wu,Jianhua Yang,Chunhua Chen,Zhaoyin Wen
Na-metal halide batteries are regarded as one of the most promising candidates for large-scale energy storage systems owing to their high energy density and high safety. However, the problems of low kinetics and poor stability caused by the low-conductive chlorides have restricted the development of Na-metal halide batteries. Here, we design a facile approach that combines electrospinning and electrodeposition to prepare electrodes with a nanostructured composite containing carbon nanofibers and Ni-Fe alloy (CNF@Ni-Fe alloy). It is confirmed that the Ni-Fe alloy can stably be oxidized and reformed when discharges from 2.36 V to 2.32 V. Benefiting from the unique nanoscale arrangement of Ni-Fe, the heterogeneous distribution of FeCl 2 and NiCl 2 effectively overcomes the block of low-conductive chlorides. Furthermore, the coreaction of Ni 2+ and Fe 2+ directly decreases the polarization potential, resulting in the improvement of reaction kinetics. Notably, batteries with the CNF@Ni-Fe alloy display a high specific capacity of 199.7 mAh g −1 and a capacity retention rate of 99% after 50 cycles at 0.6 C. The CNF@Ni-Fe alloy cathodes also deliver long-term stability with 104.5 mAh g −1 capacity retention after 600 cycles at 2 C and a good rate capability of 5 C.
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CARBON
·
2018
·
IF 7.082
Yican Wang,Wenlong Wang,Jing Sun,Chenggong Sun,Yukun Feng,Zhe Li
Microwave-metal discharge was proposed as a facile methodology to prepare unique Fe-cored carbon nanocapsules (Fe@CNCs) with high purity, novel stability and extraordinary electromagnetic wave (EMW) absorption performance . The effect of microwave power, irradiation time and cyclohexane/ferrocene ratio on the production of Fe@CNCs was examined and the properties of the nanocapsules, such as their Fe content , phase, yield, degree of graphitization and associated microstructures were investigated in detail. It was found that the prepared Fe@CNCs, which can easily be separated from the reaction system, displayed exceedingly high electromagnetic wave (EMW) absorption performance over the 2–18 GHz range. At the minimal reflection loss (RL) values over −10 dB, the EMW absorption bandwidth can reach up to 13.8 GHz with an absorber thickness of 1.5–5 mm. In addition, novel thermo-oxidative stability and super anti-corrosion property were also obtained for the Fe@CNCs as no signs of any corrosion or oxidative degradation loss were observed from the accelerated degradation tests in air and acid at temperatures up to 420 °C. The exceedingly high EMW absorption performance coupled with the superior anti-degradation and anti-corrosion properties of the prepared nanocomposite microcapsules highlights the novel capability of microwave-metal discharge in synthesizing advanced metal-cored nanocarbon microcapsules with promising application potentials in diverse fields, such as but not limited to microwave absorption, EM shielding and advanced separations etc.
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TETRAHEDRON
·
2024
·
IF 2.1
Zixu Li,Fei Wang,Kai Ma,Chao Fang,Qiang Jia,Changhu Chu
Aryl triflate is a type of facile and readily available compounds, which could be used as an alternative substrate for Suzuki cross coupling. In this manuscript, a novel ppm-Pd-Fe/C catalyst has been developed by reduction of palladium acetate and iron trichloride with aqueous hydrazine in situ and supported on activated charcoal. In combined with Sphos, and metal zinc as additives, this catalyst, with 300 ppm palladium loading, could be applied in the Suzuki cross coupling between aryl triflates with aryl neopentylglycolboronates.
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危险品化学品经营许可证（带存储）