Batteries-Basel
·
2024
·Vol. 10
·期 4
·121
·
IF 4.6
Ao Xiang,Deyou Shi,Peng Chen,Zhongjun Li,Quan Tu,Dahui Liu,Xiangguang Zhang,Jun Lu,Yan Jiang,Ze Yang,Pei Hu
Developing cost-effective cathode materials is conducive to accelerating the commercialization of sodium-ion batteries. Na4Fe3(PO4)2P2O7(NFPP) has attracted extensive attention owning to its high theoretical capacity, stable structure, and low cost of raw materials. However, its inherent low conductivity hinders its further application. Herein, carbon-coated NFPP nanospheres are anchored to crumpled MXene nanosheets by an electrostatic self-assembly; this cross-linked structure induced by CTAB not only significantly expands the contact area between particles and improves the electronic conductivity, but also effectively reduces the aggregation of NFPP nanoparticles. The as-designed Na4Fe3(PO4)2(P2O7)@C/Ti3C2Tx(NFPP@MX) cathode exhibits a high discharge capacity (106.1 mAh g−1g at 0.2 C), good rate capability (60.4 mAh g−1at 10 C), and a long-life cyclic stability (85.2% capacity retention after 1000 cycles at 1 C). This study provides an effective strategy for the massive production of high-performance NFPP cathodes and broadens the application of MXene in the modification of other cathode materials.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2019
·
IF 4.914
Hao Wang,Xiaohao Liu,Guangyue Xu,Ziwei Guo,Ying Zhang
ABSTRACT Owing to Fe being the most abundant and least expensive transition metal on the earth, the utilization of Fe-based catalysts for catalytic hydrogenation has attracted worldwide attention. In this work, a series of N-doped C supported Fe catalysts (Fe-N-C) were prepared by co-pyrolysis of cellulose and ferric chloride under ammonia atmosphere. Characterization methods such as elemental analysis, atomic absorption spectroscopy, nitrogen adsorption-desorption isotherms, transmission electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were carried out to explore the physicochemical properties of the catalysts. Using hydrogenation of nitrobenzene as a model reaction, the catalysts prepared at different pyrolysis temperatures displayed different activities. Fe-N-C-700 exhibited the best activity among these catalysts, with the yield of aniline being up to 98.0% under 5 MPa H 2 at 120 °C after 12 h. Combined with the results of catalyst characterization and comparative tests, the transformation of Fe species and the generation of N-doped C, especially graphitized N-doped C, in the catalyst may be the main factors affecting the activity. A kinetic study was carried out and the apparent activation energy was obtained as 31.53 kJ/mol. The stability of the catalyst was also tested and no significant decrease in the activity was observed after 5 runs.
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高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2022
·Vol. 17
·期 2
·e2739
·
IF 1.777
Yuan Wang,Shanshan Liu,Qirui Guo,Yidong Zhang
Conversion of biomass-derived furfural platform compound to value-added tetrahydrofurfuryl alcohol (THFL) molecule is a sustainable route, and an efficient nonnoble metallic catalyst is a key factor for this reaction. In this work, Ni@C@CNT composite as a highly effective catalyst for hydrogenation of furfural to tetrahydrofurfuryl alcohol was synthesized by one-step pyrolysis of Ni-centered metal organic framework (Ni-MOF) doping with carbon nanotube (CNT). For comparison, Ni@C catalyst derived directly from Ni-MOF was also synthesized. The characterization results show that the doping of CNT promotes high dispersion of active sites and formation of Ni 3 C phase which has Pt-like catalytic activity. Therefore, the obtained Ni@C@CNT exhibited excellent activity in furfural hydrogenation (99.1% furfural conversion and 94.7% THFL yield at 120°C, 4 h, 4-MPa initial hydrogen pressure). Ni@C@CNT also shows good stability in reuse test. Current work presents a facile method for preparation of nonnoble metallic catalysts with high efficiency.
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高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2020
·Vol. 96
·期 3
·639-649
·
IF 2.75
Shanshan Jiang,Jin Huang,Yue Wang,Shiyu Lu,Pei Li,Cuiqin Li,Feng Li
Abstact BACKGROUND Fe based metal organic frameworks (Fe-MOFs) were prepared by solvothermal method, and carbon loaded Fe 3 O 4 (Fe 3 O 4 /C) was prepared by pyrolytic carbonization and carbothermal reduction. RESULTS Various analytical techniques were used to characterize the physicochemical structure of Fe-MOFs and Fe 3 O 4 /C under different solvothermal and calcination conditions. Fe 3 O 4 /C was then employed as a catalyst for the catalytic transfer hydrogenation of furfural with alcohol as a hydrogen donor, and the effect of hydrogen donor species, reaction temperature, and reaction time were investigated. CONCLUSION The Fe 3 O 4 /C catalyst could be easily collected with a magnet and reused for four runs without significant loss of its catalytic. A possible mechanism for the catalytic transfer hydrogenation of furfural over Fe 3 O 4 /C was proposed. © 2020 Society of Chemical Industry (SCI)
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Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 23
·6067-6074
·
IF 7.779
Man Zhang,Bingbing Zhang,Daqing Yang,Ying Wang
A new birefringent crystal [C(NH2)3]2S2O8 was obtained by combining the π-conjugated [C(NH2)3] cation and the [S2O8] groups with localized O–O π-bonds. Optical measurements show that the UV cutoff wavelength of [C(NH2)3]2S2O8 is 222 nm, and its birefringence is 0.102 at 546 nm. The calculated results show that its large birefringence is attributed to the synergistic effect of the [C(NH2)3] and [S2O8] units, which is the first case among known birefringent crystals. These results provide new insights into the design of superior birefringent materials.
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高影响因子
Environmental Science-Advances
·
2023
·Vol. 2
·期 5
·731-739
·
IF 0
Wen Wen,Yina Liu,Zhongping Li,Guangming Wen,Hung-Wing Li,Li Li
In this study, we report a simple pyrolytic strategy for N–C co-doped Fe-based nanoparticles (Fe–N–C) and exhibit their oxidase-mimicking and peroxidase-mimicking activity in a chromogenic reaction with 3,3′,5,5′-tetramethylbenzidine dihydrochloride (TMB) as a substrate. Structural analysis revealed that Fe–NX and Fe3C structures were formed with Fe-Imace coordination compounds as precursors and melamine as the nitrogen source, which provided abundant active sites for the Fe–N–C nanozyme. Interestingly, owing to the blocking effect triggered by π–π stacking between the tetracycline antibiotics (TCs) tetraphenyl skeleton and Fe–N–C, the substrate affinity of the Fe–N–C was significantly blocked, resulting in the solution fading. Under the optimum conditions, the UV absorption intensity versus the concentration of TCs was found to be linear over the range of 0.08–90 μM for tetracycline (TC), 0.1–80 μM for chlortetracycline (CTC) and 0.09–100 μM for oxytetracycline (OTC). The detection limits were 62 nM for TC, 85 nM for CTC and 88 nM for OTC. The Fe–N–C displayed good storage and long-term stability when stored at 4 °C for 30 days. In addition, based on its superparamagnetism, Fe–N–C can be effectively recycled and reused through an external magnetic field, avoiding secondary pollution.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Xiang Li,Lunzhou Yu,Zhen Xiang,Erbiao Cui,Juan Xiong,Xiao Wang,Wei Lu
Core-shell structure is an effective approach to modulate the impedance matching behaviour and induce polarization relaxation at the interface for the high-performance electromagnetic wave absorption (EMWA) materials. Herein, core-shell structures of Fe 3 O 4 –Fe@C (FFC) were successfully developed by hydrothermal and thermal decomposition methods. The results showed that the phase composition, microstructure and EMWA performance were tailored by the heat treatment process. The optimized FFC hybrid exhibited a minimum reflection loss ( RL ) value of −56.3 dB with a matching thickness of 1.99 mm, and the effective bandwidth ( RL < −10 dB, 5 GHz) covers almost the whole Ku band. The enhanced EMWA properties of the reinforced olive-like composites were mainly ascribed to the magnetic loss derived from the enhanced magnetic anisotropy, and the dielectric loss originated from the multilevel interface and polarization characteristics between the core and the shell. Therefore, this work provides an approach to design core-shell nanocomposites with enhanced EMWA performance.
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高影响因子
Sustainable Energy & Fuels
·
2021
·Vol. 5
·期 23
·6170-6180
·
IF 6.367
Jijun Lu,Junhao Liu,Xuzhong Gong,Zhi Wang
Silicon is considered to be the most promising candidate for the anode of high energy density lithium-ion batteries. Nanometerization has been proven to be an effective method for improving the stress accumulation caused by the volume expansion of silicon. However, new issues such as poor initial coulombic efficiency (ICE) need to be solved because nanostructure silicon has an increased specific surface area. Here, a doping modification strategy is developed by a solvothermal combined with low-pressure gas–solid conversion reaction, and innovatively formed an Fe3C/N co-doped carbon coating on the nano-silicon surface. The doping of Fe3C in the composite material can catalyze the formation of a thin and stable solid electrolyte interphase (SEI) on the electrode surface and serve as a framework to stabilize the electrode structure during charge and discharge. As a result, Fe3C doping can significantly increase the ICE of the electrode from 66.4% to 87.1%, and the stable efficiency exhibited a rapid increase upwards of 99.5% after only 6 cycles including the first formation cycle, compared to the non-doped structure. The modified nano-silicon with Fe3C doping can provide high reversible capacity (1443.3 mA h g−1 after 200 cycles at 0.2 A g−1) and long cycle life (74% capacity retention after 1000 cycles at 0.5 A g−1).
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Ruiyang Tan,Jintang Zhou,Zhengjun Yao,Bo Wei,Jiaqi Zu,Haiyan Lin,Zhong Li
Magnetic-dielectric composites are widely used in microwave absorption applications and have been continuously concerned by researchers. The synthesis of high-performance microwave absorbers with specific structures is a hot research topic. However, the question on how to reasonably combine the magnetic and dielectric components for achieving excellent microwave absorption performance still remains unanswered. In this study, FeCo/C microspheres were synthesized by a two-step hydrothermal method . FeCo nanoparticles were embedded in carbon spheres and formed the graphite layers, which is similar to Ferrero Rocher® chocolates. The electromagnetic parameters can be effectively adjusted by controlling the hydrothermal reaction time and excellent microwave absorption properties can be achieved at a low filling ratio. The FeCo/C microspheres exhibit the maximum reflection loss of – 20.61 dB and – 51.36 dB at the thickness of 1.6 mm and 2.6 mm, respectively. The effective absorption bandwidth of these microspheres is about 4.3 GHz. The specific Ferrero Rocher® chocolates-like multi-level structure increases to a large extent the material’s conduction loss and polarization relaxation loss. At the same time, the reasonable ratio of the magnetic and dielectric components significantly improves the impedance matching. Therefore, this study is aimed at providing insights into understanding of the absorption mechanism and reliable references to the design of magnetic-dielectric composed microwave absorbers.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Yan Wang,Xiaochuang Di,Xiang Gao,Xinming Wu,Ping Wang
Lightweight and high-efficiency microwave absorbers have received considerable focus in military as well as civil fields. In this work, a unique method was employed to synthesize the Co@C polyhedrons covalently-grafted on magnetic graphene derived from MOF via amino reaction, followed by reduction and high-temperature pyrolysis processes. The results demonstrate that after a series of reaction procedures, Co@C polyhedrons are could be successfully linked to the magnetic NRGO by esterification reaction. The microwave absorption outcomes results indicate that the maximum R L of Co@C@NRGO can achieve up to −73.4 dB at 12.1 GHz with an absorber thickness of 2 mm, and the absorption bandwidth (90% absorption efficiency) is as wide as 5.3 GHz (from 9.9 to 15.2 GHz) with the content of 20 wt%. The microwave absorption mechanisms reveal that the covalent bonds between Co@C and NRGO can accelerate the electron transport and facilitate the formation of a conductive network. Meanwhile, the preferable impedance matching, strong attenuation ability, multiple interfacial polarization, and well good complementarities contribute to promoting the promotion of the EM wave absorption capacity of Co@C@NRGO hybrid. Considering the outstanding performance, the as-prepared Co@C@NRGO composite held by covalent bonding can provide an inspiration for the construction of novel microwave absorbers.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Yage Li,Shuaibing Wu,Feng Liang,Gongye Lv,Yu Tian,Haijun Zhang,Yong Liu,Guoqi Liu
Rod-like h-BN with an average diameter of 2 µm was synthesized at a relatively low temperature of 1200 °C through a catalytic pyrolysis precursor strategy using boric acid and melamine as starting materials, and Co(SO 3 NH 2 ) 2 ·4 H 2 O as a catalyst precursor. Subsequently, novel low-carbon Al 2 O 3 -C refractories were prepared via a replacement of the graphite with the as-synthesized rod-like h-BN. When 1 wt% h-BN rods were added to replace graphite, after 3 h coking at 1400 °C, the cold modulus of rupture, cold compressive strength , oxidation resistance , and thermal shock resistance of the specimen were increased by 16.4%, 24.8%, 31.2%, and 52.2%, respectively, compared with these of the control specimen. Moreover, the introduction of h-BN rods in the matrix enhanced the non-wetting ability of the refractory with molten slag, thus the rod-like h-BN modified low carbon refractory presented better slag corrosion resistance with reference to the specimen without h-BN rods.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 7
·077512
·
IF 4.386
Wenhuang Xiao,Xiaolin Zhao,Luyin Lin,Jian Luo,Haipeng Yang
Sarcosine has been discovered as a better potential biomarker for Prostate cancer (PCa). Though many high-performance amperometric sarcosine biosensors have been reported, it is still difficult to accurately detect sarcosine because of the extremely low concentration and the presence of many electroactive interferents in human serum or urine. Since most of the reported sarcosine biosensors use platinum group metals (PGM) as catalysts, it is meaningful to explore other catalysts with higher catalytic activity. Metal-nitrogen-doped carbon (M–N–C) materials are considered as alternatives to precious metals. In this study, iron doped zeolitic-imidazolate-framework-8 (ZIF-8) composites were synthesized and calcined to obtain an Iron-nitrogen-doped Carbon (Fe–N–C) material, which has excellent catalytic activity. The sensitivity of the Fe–N–C modified sarcosine biosensor is 16.5 μA mM−1, (234.2 μA mM−1 cm−2), which is the highest one in recent reported works. It has a low limit of detection (LOD, 0.7 μM, S/N = 3), and an appropriate linear detection range of 2–37 μM. This work provides a new approach to prepare high performance sarcosine biosensors by improving the catalytic activity of the modifier of the sensor. It has great potential to be used as portable devices for the rapid detection of PCa.
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