MOLECULES
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2023
·Vol. 29
·期 1
·146
·
IF 4.6
Zitao Yang,Cunhao Luo,Ning Wang,Junshao Liu,Menglong Zhang,Jing Xu,Yongnan Zhao
The high power density and long cyclic stability of N-doped carbon make it an attractive material for supercapacitor electrodes. Nevertheless, its low energy density limits its practical application. To solve the above issues, Fe2O3embedded in N-doped porous carbon (Fe2O3/N-PC) was designed by pyrolyzing Hemin/activated carbon (Hemin/AC) composites. A porous structure allows rapid diffusion of electrons and ions during charge–discharge due to its large surface area and conductive channels. The redox reactions of Fe2O3particles and N heteroatoms contribute to pseudocapacitance, which greatly enhances the supercapacitive performance. Fe2O3/N-PC showed a superior capacitance of 290.3 F g−1at 1 A g−1with 93.1% capacity retention after 10,000 charge–discharge cycles. Eventually, a high energy density of 37.6 Wh kg−1at a power density of 1.6 kW kg−1could be delivered with a solid symmetric device.Keywords:Hemin/AC;Fe2O3/N-PC;pseudocapacitance;quasi-solid-state supercapacitor
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高影响因子
ACS Sensors
·
2023
·
IF 8.9
Fan Zhao,Wei Cao,Pu-Hong Wang,Jingfeng Wang,Lingmin Yu,Zhihong Qiao,Zhi-Jun Ding
In2O3 is an optimal material for sensitive detection of carbon monoxide (CO) gas due to its low resistivity and high catalytic activity. Yet, the gas response dynamics between the CO gas molecules and the surface of In2O3 is limited by its solid structure, resulting in a weak gas response value and sluggish electron transport. Herein, we report a strategy to synthesize porous In2O3/Fe2O3 core–shell nanotubes derived from In/Fe bimetallic organic frameworks. The fabricated porous In2O3/Fe2O3-4 core–shell nanotubes present outstanding gas sensitivities, including a response value 3.8 times (33.7 to 200 ppm CO at 260 °C) higher than that of monometallic-derived In2O3 (8.7), ultrashort response and recovery times (23/76 s) to 200 ppm CO, low detection limit (1 ppm), promising selectivity, and long-term stability. The enhanced sensing mechanisms are clarified by the combination of experiment and first-principles calculations, showing that the synergetic strategy of higher adsorption energy, increased electrical conductivity, higher electron transfer numbers, and larger specific surface area of porous core–shell structures promotes the surface activity and charge transfer efficiency. The present work paves a way to tune gas-sensing materials with special morphologies for the development of high-performance CO sensors.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Jie Hu,Xueqing Xiong,Wangwang Guan,Yong Chen,Haizhu Long
In this study, a hierarchical Fe 2 O 3 -Co 3 O 4 heterojunction with abundant oxygen vacancies was fabricated by a MOF-assisted strategy combing with a thermal treatment process. The morphology, nanostructure and other properties of the synthesized samples were comprehensively investigated by related characterizations. The results display that the Co 3 O 4 modified with Fe 2 O 3 nanorod exhibits an admirable mesoporous structure and abundant oxygen vacancies. In addition, the gas sensing devices were constructed by as-prepared samples and demonstrated that the gas sensor based on Fe 2 O 3 -Co 3 O 4 composites shows excellent gas sensitivity of 91.5 towards 100 ppm acetone at a working temperature of 200 °C, with a short response-recovery time of 20/21 s. Meanwhile, the sensor possesses good reproducibility and long-term stability (over 30 days), and outstanding selectivity towards acetone gas. Exploration into a convincing gas sensing mechanism confirms that fabricating of p-n heterojunction architecture, regulating of oxygen vacancies and designing of mesoporous structure synergistically induced the excellent gas sensing performance. Therefore, this work can offer a promising strategy to enhance acetone sensing response of Fe 2 O 3 -Co 3 O 4 in practical applications.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Yuting Hu,Ting Cheng,Zhaozhong Jiang,Kai Qin,Han He,Chengzhu Zhu
Fe-MIL-101-NH 2 was prepared by solvothermal method with ferric nitrate and 2-Aminoterephthalic Acid (DBC-NH 2 ), and Fe-MIL-101-NH 2 as precursor was calcined to prepare α-Fe 2 O 3 catalyst. The optimum synthesis condition and the NO conversion efficiency of α-Fe 2 O 3 were systematically investigated, and its crystallinity, micro-morphology and surface acidity were characterized. The results showed that α-Fe 2 O 3 over calcination at 400 °C for 1 h had excellent catalytic activity, SO 2 tolerance, water resistance, and stability. When an initial NO concentration of 500 ppm, the gas hourly space velocity (GHSV) of 35000 h −1 , and a reaction temperature of 350 °C, the NO conversion efficiency of α-Fe 2 O 3 remained above 90 %. The crystal structure of the catalyst was α-Fe 2 O 3 which retained the original octahedral morphology of Fe-MIL-101-NH 2 and increased a lot of new pores, leading to more abundant Lewis acid sites for promoting NO conversion efficiency.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Chen Wang,Yinglin Wang,Pengfei Cheng,Luping Xu,Fan Dang,Tianliang Wang,Zhaohui Lei
A highly sensitive and selective acetone gas sensor has been fabricated successfully by designing n-n heterojunction consisting of TiO 2 nanorods and α -Fe 2 O 3 branches. The structure and morphology of the TiO 2 / α -Fe 2 O 3 nanocomposites were examined via X-ray diffraction and scanning electron microscopy, respectively. TiO 2 nanorod (with the diameter about 42 nm) arrays were in-situ generated on the surface of Al 2 O 3 ceramic tubes by a simple hydrothermal process. In addition, α -Fe 2 O 3 branches grew on TiO 2 stems successfully in the second hydrothermal process. These nanorod branches had a relatively uniform length, which could be tunable by changing the concentration of iron precursor. The gas sensing properties of the pristine and α -Fe 2 O 3 branches-decorated TiO 2 nanorods sensors with regard to acetone gas were investigated. The results indicated that the sensor based on TiO 2 / α -Fe 2 O 3 heterostructures measured at 225 °C had a higher response of 21.9 toward 100 ppm of acetone gas which was about 9 times higher than pristine TiO 2 nanorods sensor. The dominant mechanism for enhanced sensing properties were discussed in detail with the semiconductor depletion layer model and TiO 2 / α -Fe 2 O 3 n–n heterojunction theory.
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ACS Applied Energy Materials
·
2021
·
IF 6.024
Meiwan Chen,Dechao Niu,Jiayi Mao,Guangyu Jiang,Kaiyuan Li,Gaoxu Huang,Xiaopan Jin,Yongsheng Li
Though great progresses have been made on improving the volume effect and electronic conductivity of anode materials in sodium-ion batteries (SIBs), the electrical performance at high current density for long cycling stability is still a huge challenge. To address this, a facile confined-impregnation/crystallization strategy is developed to construct a movable Fe2O3 core in nitrogen-doped hierarchical porous carbon nanospheres (MFe2O3@N-HCNs) for ultrafast intercalation/deintercalation of SIBs. The as-prepared MFe2O3@N-HCNs not only exhibit a connected and hierarchal porous structure with large surface specific area (∼367 m2 g–1) but also possess a highly dispersed and moveable Fe2O3 core (∼5 nm) for the tolerance of volume expansion during the intercalation/deintercalation process of sodium ions. As SIBs anode materials, the MFe2O3@N-HCNs anode exhibits a capacity of 417 mAh g–1 at 0.1 A g–1 after 100 cycles and of 364 mAh g–1 at 2 A g–1 with 4500 cycles. Especially, a prominent discharge capacity of 102 mAh g–1 is still obtained at 5 A g–1 after 10000 cycles. Such remarkable performances should be attributed to the unique highly dispersed and moveable Fe2O3 core and conductive nitrogen-doped hierarchical porous carbon framework with large surface area. Consequently, this study develops a facile methodology to promote the energy storage and long cycling performance of hierarchically porous carbon@transition-metal oxide (TMO) composite anode materials for SIBs, especially at high current density.
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MATERIALS RESEARCH BULLETIN
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2020
·
IF 4.019
Jun Liu,Lingling Sun,Guangli Li,Jue Hu,Quanguo He
In this study, spindle-like α-Fe 2 O 3 mesocrystals/reduced-graphene-oxide composites modified glassy carbon electrode (α-Fe 2 O 3 /rGO/GCE) is developed for ultrasensitive electrochemical detection of DA. Morphologies and crystal structures of this composite are characterized by SEM, TEM , XRD , Raman spectrum, and XPS , respectively. The electrochemical behavior of DA on these electrodes are investigated by CV and EIS . The electrochemical conditions are optimized systematically. As results, the oxidation current of DA on α-Fe 2 O 3 /rGO/GCE is 38.13-fold increase than that on bare GCE. It is ascribed to the high catalytic activity of α-Fe 2 O 3 mesocrystals and large electrochemical active area of rGO. Under the best voltammetric condition, wide linear detection range (from 1.0×10 −8 to 9.0×10 -4 mol/L) and low LOD of 3.26 nM (S/N=3) are obtained on the α-Fe 2 O 3 /rGO/GCE. Furthermore, this electrode is also used for DA detection in real human serums samples successfully. This α-Fe 2 O 3 /rGO/GCE provides a good example in design of other mesocrystals-based composite materials for electrochemical detection.
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CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Run Huang,Yanfei Li,Wenbin Liu,Yonghai Song,Li Wang
N-doped honeycomb-like carbon networks (N–HCN) loaded with ultra-fine Fe 2 O 3 nanoparticles (Fe 2 O 3 /N–HCN) are proposed as anode materials for lithium-ion batteries (LIBs). The Fe 2 O 3 /N–HCN nanocomposites are prepared by freeze-drying of glucose-Fe(NO 3 ) 3 solution, following by grinding it with urea, and finally annealing treatment. The N–HCN with dozen micrometer-sized macropores is composed of carbon nanosheets with a thickness of about 33 nm. A large number of 2–7 nm-sized ultra-fine Fe 2 O 3 nanoparticles with an average size of 4.4 nm are uniformly arrayed on the wall of N–HCN. The Fe 2 O 3 /N–HCN nanocomposites exhibit good performances as anode materials for LIBs. After 500 cycles under a large current density of 5 A g −1 , the Fe 2 O 3 /N–HCN nanocomposites still show a reversible capacity of 408 mAh g −1 . The good performance can be ascribed to the uniformly dispersed ultra-fine Fe 2 O 3 nanoparticles and unique honeycomb-like structure of N–HCN which provides a continuous conductive network to greatly promote the rapid transfer of ions and electrons, and effectively alleviate the volume fluctuation effect of Fe 2 O 3 during charging and discharging. More importantly, the cheap and environmentally friendly glucose as raw materials provides possibility for green energy applications.
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NANOTECHNOLOGY
·
2020
·Vol. 31
·期 13
·135403
·
IF 3.551
Taowen Dong,Ting Deng,Xianyu Chu,Tingting Qin,Haoxiang Wang,Zizhun Wang,Wei Zhang,Weitao Zheng
Earth-abundant Fe2O3 is a promising material for the negative electrode of supercapacitors by virtue of its wide potential windows. However, the unsatisfactory electrical conductivity and poor ionic diffusion rate within Fe2O3 results in degraded electrochemical performance. In this work, to address these issues, we demonstrate an easy method to synthesize Fe-based zeolitic imidazolate framework (Fe–ZIF) derived α–Fe2O3@C with remarkable supercapacitive properties. The as-obtained α–Fe2O3@C electrode, with the particular benefit of dispersed distribution of carbon, enabling fast electrochemical response, presents a prospective specific capacitance of 161 Fg−1 at a current density of 1 Ag−1. Furthermore, by using the α–Fe2O3@C architecture as the negative electrode, we fabricated a supercapacitor with Na0.5MnO2 as the positive electrode. Our supercapacitor shows a high energy density of 25 Whkg−1, while the corresponding power density is 2400 Wkg−1 at a current density of 2 Ag−1.
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CHINESE JOURNAL OF CATALYSIS
·
2019
·
IF 4.914
Ruowen Liang,Zhiyu Liang,Feng Chen,Danhua Xie,Yanling Wu,Xuxu Wang,Guiyang Yan,Ling Wu
Magnetically recyclable porous sodium dodecyl sulfate (SDS)/Fe 2 O 3 hybrids, which combine the porous structure of Fe 2 O 3 and hydrophobicity of SDS, have been successfully synthesized for the first time. Porous Fe 2 O 3 has been first pyrolyzed from MIL-100(Fe) using a simple two-step calcination route. Then, the obtained porous Fe 2 O 3 nanoparticles have been self-assembled with SDS molecules and yielded hydrophobic SDS/Fe 2 O 3 hybrids. The porous SDS/Fe 2 O 3 hybrids have been demonstrated to be highly efficient for the denitrification of pyridine under visible light irradiation. The pyridine removal ratio has reached values as high as 100% after irradiation for 240 min. Combining the results of a series of experimental measurements, it was concluded that the superior photocatalytic performance of SDS/Fe 2 O 3 hybrids could be attributed to (i) the fast electron transport owing to the unique porous structure of Fe 2 O 3 , (ii) the superior visible light absorption of Fe 2 O 3 nanoparticles, and (iii) the “bridge molecule” role of SDS efficiently improving the separation and transfer across the interfacial domain of SDS/Fe 2 O 3 of photogenerated electron-hole pairs. More significantly, after the catalytic reaction , the SDS/Fe 2 O 3 hybrids could be easily recovered using magnets and reused during subsequent cycles, which indicated their stability and recyclability.
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NANOTECHNOLOGY
·
2020
·Vol. 31
·期 12
·125405
·
IF 3.551
Yuzhu Guan,Peiyuan Ji,Jing Wan,Dazhi Zhang,Zhao Wang,Hao Tian,Chenguo Hu,Baoshan Hu,Qing Tang,Yi Xi
By exploiting the storage performance of supercapacitors, iron has the potential to be used as a new anode material. However, this potential is limited by unsatisfactory electrical conductivity and poor cycling stability which impact the energy and power density. Consequently a foundation for improving the electrical conductivity and cycling stability of iron materials to obtain good storage performance is needed. In this work, Ag-modified Fe2O3 nanoparticles on carbon cloth were synthesized as an anode material for supercapacitors. The specific capacitance of the composite material reaches 10.39 F cm−2 (2734.2 F g−1) at a current density of 1 mA cm−2 and remains at 83% of this value after 12 000 cycles. The energy density is 379.8 Wh kg−1 at a power density of 131.6 W kg−1 and remains at 123.9 Wh kg−1 at a power density of 2631.6 W kg−1. The electrical conductivity and interfacial effect created between Ag@Fe2O3 is confirmed with density functional theory calculations. The packaged asymmetric supercapacitor devices have flexibility and can light ten LEDs for 2 min 30 s, with an energy density of 60.3 Wh kg−1 that can be reached at a power density of 1063.8 W kg−1 and remain at 16 Wh kg−1 even at a power density of 4255.3 W kg−1.
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MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Jirong Bai,Haiyang Xu,Gang Chen,Wenhua Lv,Zhijiang Ni,Zhilei Wang,Jiaying Yang,Hengfei Qin,Zheng Zheng,Xi Li
α-Fe 2 O 3 /porous g-C 3 N 4 (α-Fe 2 O 3 /PCN) photocatalysts were fabricated via a facile and green method. Structural characterization indicated α-Fe 2 O 3 nanoparticles were successfully loaded onto PCN. The α-Fe 2 O 3 /PCN nanocomposites were proven durable with significantly enhanced photocatalytic activity for Rhodamine B photodegradation than the single components under visible light irradiation. The improved photoactivity was mainly attributed to the broadened visible light absorption, enriched active sites, and formation of α-Fe 2 O 3 /PCN heterojunction that addressed the recombination of photoinduced electrons and holes. The α-Fe 2 O 3 /PCN hybrids also showed high recyclability and chemical stability.
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