FUEL
·
2022
·
IF 8.035
Xiangyang Mao,Ge Liu,Bolun Yang,Jianxuan Shang,Bo Zhang,Zhiqiang Wu
Macromolecular volatiles are one of the important components of biomass pyrolysis products. Chemical looping reforming can efficiently convert macromolecular components into hydrogen-rich syngas. Oxygen carriers with good partial oxidation performance and excellent recycling performance are the key factor. In this work, the embeddedness strategy was proposed to regulate the micro-reaction environment of oxygen carriers and thus improve the recycling and partial oxidation performance. The characteristics of toluene chemical looping reforming via Fe 2 O 3 embedded in SBA-15 (Fe 2 O 3 @SBA-15) were studied in fixed-bed reactor. The performances of Fe 2 O 3 and Fe 2 O 3 @SBA-15 were compared. The effect of pure Fe 2 O 3 particle size, Fe 2 O 3 loading amount, and reaction temperature were investigated. Thermodynamic analysis results showed that the reaction could proceed spontaneously when the temperature was higher than 600℃. The experimental results showed that chemical looping reforming process could be divided into two stages, including partial oxidation and catalytic cracking. The main product in the first stage was syngas, while the main product in the latter stage was H 2 and coke. The Fe 2 O 3 particle size decreased from 5um to 30 nm, and the CO selectivity increased from 25.87% to 33.15%. This indicated that the nanocrystallization of Fe 2 O 3 would improve the partial oxidation performance. Compared with pure Fe 2 O 3 , the CO selectivity of Fe 2 O 3 @SBA-15 rose from 25.9% to 96.2%. The utilization rate of lattice oxygen and the conversion rate of toluene increased significantly. At 900℃, toluene was nearly completely converted, and the utilization rate of lattice oxygen reached 92.7%. The toluene conversion increased with the elevation of Fe 2 O 3 loading, and the CO selectivity always remained above 87.9%. With the elevation of reaction temperature from 700℃-900℃, toluene conversion increased from 30.5% to 95.6%, while CO selectivity decreased slightly. More importantly, the stability test results showed that after 10 cycles, toluene conversion rate only dropped by 1.9%, and the average concentration of gas products remained stable. The above results showed that the embeddedness of Fe 2 O 3 in SBA-15 could effectively improve CO selectivity, enhance the transmission and release of lattice oxygen, and elevate the catalytic performance and cycle stability of oxygen carriers.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 40
·405502
·
IF 3.953
Ziqin Zhuang,Li Zhang,Chaozhu Huang,Xiaohang Wang,Haichuan Guo,Tiju Thomas,Fengdong Qu,Pei Wang,Minghui Yang
Surface modification by employing precious metals is one of the most effective ways to improve the gas-sensing performance of metal oxide semiconductors. Pure α-Fe2O3 nanoparticles and Pt-modified α-Fe2O3 nanoparticles were prepared sequentially using a rather simple hydrothermal synthesis and impregnation method. Compared with the original α-Fe2O3 nanomaterials, the Pt-α-Fe2O3 nanocomposite sensor shows a higher response value (Ra/Rg = 58.6) and a shorter response/recovery time (1 s/168 s) to 100 ppm dimethyl disulfide (DMDS) gas at 375 °C. In addition, it has better selectivity to DMDS gas with the value of more than 9 times higher than the other target gases at 375 °C. This study indicates that the Pt-α-Fe2O3 nanoparticle sensor has good prospects and can be used as a low-cost and effective DMDS gas sensor.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LIQUID CRYSTALS
·
2022
·
IF 2.676
Xiangshen Meng,Jian Li,Yueqiang Lin,Xiaodong Liu,Guoqing Li,Jianwei Zhao,Yingning Miao,Wenjian Li,Wenjiang Ye,Decai Li,Zhenghong He
In this paper, the microstructures of the dilute magnetic PDLC films, doped with low concentrations of γ-Fe2O3 nanoparticles, have hardly changed, but their electric-optical responses have distinctly changed. The experimental results show that the threshold voltage and hysteresis decreased with the increasing concentration of γ-Fe2O3 nanoparticles. Furthermore, at the relatively low concentration of γ-Fe2O3 nanoparticles (samples (0) and (1) according to ϕm of 0 and 0.11%), the reciprocity of the rise time increased nonlinearly with the increasing square of the applied voltage. However, at the relatively high concentration of γ-Fe2O3 nanoparticles (samples (2) according to ϕm = 0.15%), the reciprocity of the rise time increased linearly with the square of the applied voltage. Moreover, the reciprocity of the decay time was independent of the applied voltage and decreased with increasing the concentration of γ-Fe2O3 nanoparticles. These characteristics are due to the adsorption of free ions by γ-Fe2O3 nanoparticles. As a result, the interfacial interaction between liquid crystal droplets and the polymer matrix decreased, and the effective electric field inside the liquid crystal droplets increased.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Crystals
·
2025
·Vol. 15
·期 1
·85
·
IF 2.4
Chen Liu,Jiajuan Li,Wenyao Zhang,Changqing Zhu
Considering the poor conductivity of Fe2O3and the weak oxygen evolution reaction associated with it, surface hole accumulation leads to electron hole pair recombination, which inhibits the photoelectrochemical (PEC) performance of the Fe2O3photoanode. Therefore, the key to improving the PEC water oxidation performance of the Fe2O3photoanode is to take measures to improve the conductivity of Fe2O3and accelerate the reaction kinetics of surface oxidation. In this work, the PEC performances of Fe2O3photoanodes are synergistically improved by combining loaded an FeOOH cocatalyst and oxygen vacancy doping. Firstly, amorphous FeOOH layers are successfully prepared on Fe2O3nanostructures through simple photoassisted electrodepositon. Then oxygen vacancies are introduced into FeOOH-Fe2O3through plasma vacuum treatment, which reduces the content of Fe-O (OL) and Fe-OH (-OH), jointly promoting the generation of oxygen vacancies. Oxygen vacancy can increase the concentration of most carriers in Fe2O3and form photo-induced charge traps, promoting the separation of electron holes and enhancing the conductivity of Fe2O3. The other parts of -OH act as oxygen evolution catalysts to reduce the reaction obstacle of water oxidation and promote the transfer of holes to the electrode/electrolyte interface. The performance of FeOOH-Fe2O3after plasma vacuum treatment has been greatly improved, and the photocurrent density is about 1.9 times higher than that of the Fe2O3photoanode. The improvement in the water oxidation performance of PEC is considered to be the synergistic effect of the cocatalyst and oxygen vacancy. All outstanding PEC response characteristics show that the modification of the cocatalyst and oxygen vacancy doping represent a favorable strategy for synergistically improving Fe2O3photoanode performance.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Qiuyan Hao,Liang Zhang,Yaohui Gao,Da Cao,Jianwei Zhao,Ying Li,Caichi Liu,Zhi Qiao,Wenjun He,Hui Liu
It is indispensable to explore earth-abundant and high-efficiency transition-metal-oxide electrocatalysts toward the hydrogen evolution reaction (HER). However, their catalytic performance is impeded by the poor conductivity. Herein we rationally design and manufacture sulfur-doped Fe2O3 nanosheet arrays grown on iron foam (S-Fe2O3/IF) with enhanced HER performance in alkaline media. The obtained catalyst exhibits a low overpotential of 134 mV to achieve a current density of 10 mA cm–2 with a small Tafel slope of 76 mV dec–1 and shows an excellent long-term durability with barely any degradation for 50 h. The density functional theory calculation and experimental results demonstrate that the sulfur anion could optimize adsorption free energies of hydrogen/water and improve the intrinsic activity of Fe2O3. This work not only develops a catalyst with highly efficient performance but also provides design guidance to rationally manufacture an earth-abundant-element electrocatalyst for large-scale water splitting to hydrogen.
研究领域:
材料科学
·
电催化
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 9
·1-13
·
IF 2.8
Lu P. A.,Manikandan M. R.,Yang P. F.,He Y. L.,Yang F.,Dang S. T.,Shi Y. C.,Lou W. B.,Liu R.,Wu S. J.,Li X. F.,Hu Y. C.,Shang J.,Yin S. Q.,Wang X. W.
The development of iron-based supercapacitors has been gaining more attention in the field of energy storage applications due to their non-toxicity, abundance and low cost. In this paper, single phase hematite nanoparticles were synthesized by high temperature thermal decomposition method and directly served as electrochemical supercapacitor electrode material. Structural study (XRD) revealed the single-phase hematite nanoparticles formation with trigonal alpha-Fe 2 O 3 structure. Morphological study (SEM) confirms silkworm chrysalis shape like morphology by many interconnected nanoparticles of the average size of 30 nm. The electrochemical study indicates that the synthesized hematite electrode material can maintain good farad capacitance at 100 mV/s and it shows a specific capacitance of 149.3 F/g at a current density of 1 A/g with the maximum energy and power densities of 4.20 Wh/Kg and 224.90 W/Kg, respectively. Equivalent series resistance and charge transfer resistance of alpha-Fe 2 O 3 electrode material are 1.079 Ω and 9.055 Ω, respectively. This is attributed to the alpha-Fe 2 O 3 nanostructure, which can provide a large contact area between electrode and electrolyte for ionic reaction and transport. The material can still retain 43.8% of the initial specific capacitance after 5000 cycles. The investigation results show that the hematite nanoparticle-based electrode material holds great potential in electrochemical supercapacitors and provides a certain reference in the direction of global energy needs.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Caixia Deng,Shuang Li,JiaYu Wang,Qiang Yang,Hui Chen,Fenglin Tang,Xiupei Yang
In this work, flower-like TiO 2 (TiO 2 -F) was first prepared by modulating the morphology of TiO 2 , and then, α-Fe 2 O 3 was loaded onto TiO 2 -F to successfully prepare α-Fe 2 O 3 /TiO 2 -F heterojunction materials. The material showed excellent degradation properties of doxycycline hydrochloride under visible light. The photocatalytic degradation efficiency of α-Fe 2 O 3 /TiO 2 -F2 for doxycycline hydrochloride under visible light reached 95.76 % in 120 min, and its pseudo-first-order degradation rate constant was 0.02647 min −1 , which was 3.68 and 2.01 times higher than those of α-Fe 2 O 3 and TiO 2 alone, respectively. This good photocatalytic performance is attributed mainly to the introduction of α-Fe 2 O 3 to form a Type II heterojunction with floral TiO 2 (TiO 2 -F), which is capable of promoting the separation of electron–hole pairs of photocatalysts and exhibiting a stronger redox capacity. The material exhibits notable stability and maintains high degradation efficiency even after undergoing multiple cycles. Furthermore, free radical trapping experiments and electron spin resonance (ESR) characterization revealed that hydroxyl radicals play a dominant role in this system. Finally, the degradation pathways were analyzed, and relevant toxicological analyses were performed, indicating that the toxicity of doxycycline hydrochloride gradually decreased during the photocatalytic degradation process.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2016
·Vol. 3
·期 7
·075024
·
IF 0.968
Shiben Liu,Yingjie Chen,Lifeng Dong
Hybrid nanostructures can be multifunctional and even possess enhanced properties. Ag–Fe2O3 nanocomposites and Ag nanoparticles (NPs) were fabricated and applied to catalyze the reduction of 4-nitrophenol. Compared with Ag NPs, Ag–Fe2O3 nanocomposites demonstrated enhanced catalytic activities. Furthermore, due to their magnetic properties, Ag–Fe2O3 nanocomposites could be easily separated from the reaction mixture and recycled through an external magnetic field. These findings will help us design hybrid nanostructures with catalytic activity and explore other potential applications of magnetic nanocomposites.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
FirePhysChem
·
2021
·
IF 0
Ming Zhang,Fengqi Zhao,Hui Li,Yanjing Yang,Ting An,Yifan Jiang,Na Li
The spherical, hollow and tubular Fe 2 O 3 (s, h and t) and their graphene-based nanocomposites rGO-Fe 2 O 3 (s, h and t) were fabricated using the facile solvothermal methods. The morphologies and compositions of the as-synthesized Fe 2 O 3 (s, h and t) and rGO-Fe 2 O 3 (s, h and t) nanocomposites were systematically characterized by SEM, TEM, XRD, FTIR and XPS methods. Then, the effect of the catalytic performance of Fe 2 O 3 (s, h and t) and rGO-Fe 2 O 3 (s, h and t) nanocomposites on the thermal decomposition of ammonium perchlorate (AP) were studied by DSC method. The DSC results showed that all of the Fe 2 O 3 (s, h and t) and rGO-Fe 2 O 3 (s, h and t) nanocomposites can effectively promote the thermal decomposition of AP. Besides, rGO-Fe 2 O 3 (s) nanocomposite has the best catalytic performance, and the high-temperature decomposition exothermic peak of AP was significantly reduced after its mixing with rGO-Fe 2 O 3 (s) nanocomposite. It can be seen that the effects of Fe 2 O 3 on AP decomposition is mainly reflected in the high temperature process, while the effects of rGO-Fe 2 O 3 (s) on AP decomposition is reflected in both high and low temperature stages, and the effect on the high temperature stage is more significant. The excellent catalytic performance of rGO-Fe 2 O 3 (s) nanocomposite can be attributed to the in-situ growth of Fe 2 O 3 on the surface of rGO, which contributes to the low temperature decomposition process of AP.
研究领域:
材料科学
·
化学
·
纳米技术
✓ 已验证
DOI
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yuxi Li,Zhuwei Zhu,Ximai Zhang,Fengkuan Ma,Qiaohong Zhang,Chen Chen,Hongying Lü
Selective oxidation of hydrocarbon under mild conditions is one of scientific challenges. In the present work, facet effect was utilized to design an efficient catalytic system of N -hydroxyphthalimide (NHPI) and specific α-Fe 2 O 3 with different preferential crystal facets. Higher ratio of crystalline facet {110}/{104} was identified as a key factor to facilitate the interaction between NHPI molecules and surface of α-Fe 2 O 3 , then realize a higher catalytic activity. Being photo-irradiated with the blue light (455 nm, 3 W) at ambient temperature for 4 h, conversion of 92.2% was obtained for the selective oxidation of ethylbenzene with α-Fe 2 O 3 -T100 that owns more preferential crystalline facets {110}, which is about 1.8 times as high as that (51.0%) being obtained with commercial C-α-Fe 2 O 3 -{104}. The present efficient catalytic system also exhibited good universality for the selective oxidation of a series of other hydrocarbons.
研究领域:
催化
·
材料科学
·
化学反应工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY
·
2021
·
IF 5.277
Di Sun,Jin Mao,Zhijian Wang,Hui Li,Liangxiao Zhang,Wen Zhang,Qi Zhang,Peiwu Li
Peanut is an important resource of edible oil and digestible protein in daily life, which is rich in the nutriments and antioxidants such as vitamins, minerals and polyphenols. However, peanut is susceptible to the contamination of Aspergillus flavus ( A. flavus ), which can produce highly carcinogenic toxins that brings serious threats to human health and food safety. Exploring green and effective methods to control A. flavus is meaningful. Herein, a green and economical way to control A. flavus on peanuts was demonstrated. It was found that the growth of A. flavus hyphae and germination of its spores could be inhibited in the presence of α-Fe 2 O 3 nanorods under sunlight irradiation according to the agar diffusion method , flat colony counting method and fluorescence-based live/dead test. The diameter of inhibition zone was 22.3 ± 0.2 mm and the inhibition rate of spores germination was about 60 ± 5%, when the concentration of α-Fe 2 O 3 was 10 mg/mL for 7 h sunlight irradiation. Most important, α-Fe 2 O 3 showed the photocatalytic inhibition of A. flavus on peanuts under sunlight irradiation with the inhibition rate of about 90 ± 5%, and the production of aflatoxin B 1 and aflatoxin B 2 were reduced by 90 ± 2% and 70 ± 3%, respectively. By comparing the fat contents, protein contents, acid value, peroxide value and antioxidative compositions of peanuts, it was found that there was no obvious effect on the quality of peanuts after inhibition treatment. The findings provide a green, safe and economical strategy to control A. flavus on peanuts, which may be as a promising way to be used in food and agro-food preservation.
研究领域:
食品科学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
ACS Catalysis
·
2015
·
IF 9.312
Kunfeng Zhao,Hailian Tang,Botao Qiao,Lin Li,Junhu Wang
Au/γ-Fe2O3 and Au/α-Fe2O3 catalysts with identical size of Au nanoparticles, chemical state of Au species, and amount of surface OH– group were prepared. The Au/γ-Fe2O3 catalyst exhibited exceptionally high activity, regardless of the heat treatments. The CO-TPR, sequential pulse reaction, and in situ Raman spectra demonstrate that the much higher activity of Au/γ-Fe2O3 originated from its higher redox property at low temperature. Systematic study shows that this higher-redox-property-based higher activity could be extended to γ-Fe2O3-supported Pt-group metals and to other reactions that follow Mars–Van Krevelen mechanism. This finding may provide a new avenue for catalyst improvement or development by choosing the suitable crystal phase of the oxide support.
研究领域:
催化化学
·
材料科学
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）