CERAMICS INTERNATIONAL
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2026
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IF 6
Zhuoqing An,Xiaolong Ni,Zhuang Ma,Yuan Gao,Jiajing Chen
To investigate the effects of La 2 O 3 and Fe 2 O 3 on the structure and high viscosity of the CaO-MgO-Al 2 O 3 -SiO 2 (CMAS) glass system, the microstructure was analyzed using in-situ high-temperature Raman spectroscopy, and the viscosity was measured by high temperature hot-stage. A series of cluster models representing aluminosilicate systems modified by La and Fe ions were constructed, followed by geometric optimization and Raman spectral simulation via quantum chemistry ab initio calculations. The results indicates that the effects of La 2 O 3 and Fe 2 O 3 on both vibrational wavenumber and Raman scattering cross-section (RSCS) followed the order: La < (La + Fe) < Fe. The addition of La 2 O 3 and Fe 2 O 3 loose the glass network structure, and led to a progressive rise in the relative content of Q 0 , Q 1 , and Q 2 units, accompanied by a notable decrease in Q 3 and Q 4 units. Consequently, the high viscosity and viscous flow activation energy decrease with the addition of La 2 O 3 and Fe 2 O 3 , but Fe 2 O 3 has a more pronounced effect. Furthermore, based on the NBO/T for characterizing the microstructure, the relationship between viscosity and microstructure is quantitatively analyzed.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2026
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IF 9.2
Yipeng Zhang,Jibo Zhang,Shihua Yu,Xiang Li,Lili Wang,Zhigang Liu
Efficient bifunctional electrocatalysts are vital for boosting water electrolysis performance. Herein, starch-derived porous carbon microspheres were synthesized under high-salinity conditions to serve as conductive templates for the in situ growth of transition metal species. Through carbonization and phosphorization, an inverse spinel composite, P-[Ni (0.15) Co (0.15) Fe (0.7) ]O–Fe 2 O 3 , was generated. The carbon microspheres provided excellent conductivity and mechanical stability, while the nanosheets offered abundant active sites and porous structures, ensuring enhanced electron transfer and strong synergistic interactions. Consequently, the optimized catalyst exhibited outstanding bifunctional performance, with low overpotentials of 217 mV for oxygen evolution and 125 mV for hydrogen evolution at 10 mA cm −2 . The assembled electrolyzer delivered 10 mA cm −2 at 1.58 V and maintained stability for 100 h. This work demonstrates a sustainable route for fabricating high-performance transition metal-based electrocatalysts using renewable starch biomass.
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ACS Applied Materials & Interfaces
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2017
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IF 7.504
Xin Qi,Hao-Bin Zhang,Jiantie Xu,Xinyu Wu,Dongzhi Yang,Jin Qu,Zhong-Zhen Yu
A highly efficient and continuous high-pressure homogenization (HPH) approach is developed for scalable production of graphene sheets and sandwich-structured α-Fe2O3/graphene hybrids by liquid-phase exfoliation of stage-1 FeCl3-based graphite intercalation compounds (GICs). The enlarged interlayer spacing of FeCl3-GICs facilitates their efficient exfoliation to produce high-quality graphene sheets. Moreover, sandwich-structured α-Fe2O3/few-layer graphene (FLG) hybrids are readily fabricated by thermally annealing the FeCl3 intercalated FLG sheets. As an anode material of Li-ion battery, α-Fe2O3/FLG hybrid shows a satisfactory long-term cycling performance with an excellent specific capacity of 1100.5 mA h g–1 after 350 cycles at 200 mA g–1. A high reversible capacity of 658.5 mA h g–1 is achieved after 200 cycles at 1 A g–1 and maintained without notable decay. The satisfactory cycling stability and the outstanding capability of α-Fe2O3/FLG hybrid are attributed to its unique sandwiched structure consisting of highly conducting FLG sheets and covalently anchored α-Fe2O3 particles. Therefore, the highly efficient and scalable preparation of high-quality graphene sheets along with the excellent electrochemical properties of α-Fe2O3/FLG hybrids makes the HPH approach promising for producing high-performance graphene-based energy storage materials.
研究领域:
材料科学
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纳米技术
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储能
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电化学
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化学工程
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Liping Ren,Wei Zhou,Bojing Sun,Haoze Li,Panzhe Qiao,Yachao Xu,Jiaxing Wu,Kuo Lin,Honggang Fu
Defect-engineered magnetic γ-Fe 2 O 3 ultrathin nanosheets/mesoporous black TiO 2 hollow sphere heterojunctions (γ-Fe 2 O 3 /b-TiO 2 ) are fabricated by a metal-ion intervened hydrothermal technique and high-temperature hydrogenation, which exhibit wide-spectrum response and magnetic separation. The specific surface area, pore size and pore volume of the resultant γ-Fe 2 O 3 /b-TiO 2 with hollow structure are ∼63 m 2 g −1 , 10.5 nm and 0.14 cm 3 g −1 , respectively. After surface hydrogenation, α-Fe 2 O 3 nanosheets are converted to γ-Fe 2 O 3 ultrathin nanosheets (∼6 nm) combined with the formation of surface defects. The ultrathin nanosheet structure facilitates the surface engineering and also favors the diffusion and transportation of photogenerated charge carriers. The apparent rate constant (k) of defect-engineered γ-Fe 2 O 3 /b-TiO 2 photocatalytic degradation biotoxic tetracycline is ∼3 times higher than that of α-Fe 2 O 3 /b-TiO 2 under AM 1.5 irradiation. The enhancement is attributed to the introduction of narrow bandgap unit-cell-thick γ-Fe 2 O 3 nanosheets, the hollow structure and the defect engineering, which are beneficial to solar-light-harvesting and rapid electron transport, and spatial separation of photogenerated charge carriers. The photocatalytic degradation mechanism is also proposed. The novel magnetic γ-Fe 2 O 3 /b-TiO 2 heterojunction is a promising photocatalyst for recovering the domestic sewage in environment.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Xiongfang An,Yang Chen,Minghui Ao,Yahui Jin,Liwei Zhan,Bing Yu,Zhansheng Wu,Peikun Jiang
Photocatalysis is regarded as one of the most promising techniques for degrading organophosphorus pesticides (OPs) from wastewater given its low-cost and environmental benignity. Yet, photocatalytic degradation of OPs is an incomplete process, since PO 4 3− is produced after photocatalysis. Here, biochar-supported α-Fe 2 O 3 /MgO composite (BC-α-Fe 2 O 3 /MgO) is developed for sequential photocatalytic degradation of OPs and recovery of the produced PO 4 3− . The degradation efficiency of N-phosphonomethyl iminodiacetic acid (NPA) by BC-α-Fe 2 O 3 /MgO based photocatalysis reaches 90.1% within 80 min, and the recovery ratio of the produced PO 4 3− by BC-α-Fe 2 O 3 /MgO is as high as 82.3%. Besides, the as-prepared BC-α-Fe 2 O 3 /MgO used in this integrated photocatalysis and adsorption process maintain a high stability towards NPA degradation and PO 4 3− recovery during five cycling experiments. The mechanistic study reveals that holes, •OH, and • O 2 – radicals generated in the photocatalytic process are responsible for NPA degradation. UV light can activate persistent free radicals on BC-α-Fe 2 O 3 /MgO surface, which provide O 2 with electrons for the generation of • O 2 – and subsequent yield of •OH. Moreover, the presence of α-Fe 2 O 3 and MgO on the surface of biochar leads to the excellent P adsorption performance of BC-α-Fe 2 O 3 /MgO. This study opens new possibilities for the recovery of P resource from organophosphorus polluted wastewater.
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Frontiers in Chemistry
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2022
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IF 5.545
Liang Qingwen,Tang Ping,Zhou Jing,Bai Jinghe,Tian Dan,Zhu Xiaofei,Zhou Defeng,Wang Ning,Yan Wenfu
Solid state electrolytes have been intensively studied in the solid oxide fuel cells (SOFCs). The aim of this work is to investigate the effects of MgO and Fe2O3 dual sintering aids on the microstructure and electrochemical properties of solid state Gd0.2Ce0.8O2-δ (GDC) electrolytes, which are prepared by a sol-gel method with MgO and Fe2O3 addition to the GDC system. It is found that the addition of MgO and Fe2O3 can reduce the sintering temperature, increase densification and decrease the grain boundary resistance of the electrolyte. The 2 mol% MgO and 2 mol% Fe2O3 co-doped GDC (GDC-MF) exhibits the highest grain boundary conductivity. At 400°C, the grain boundary conductivity and total conductivity of GDC-MF are 15.89 times and 5.56 times higher than those of GDC. The oxygen reduction reaction (ORR) rate at the electrolyte/cathode interface of GDC-MF is 47 % higher than that of GDC. Furthermore, the peak power density of a single cell supported by GDC-MF is 0.45 W cm−2 at 700°C, 36.7% higher than that of GDC. Therefore, the GDC-MF should be a promising electrolyte material for intermediate-temperature solid oxide fuel cells (IT-SOFCs).
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PubMed
高影响因子
MICROCHIMICA ACTA
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2016
·Vol. 184
·期 1
·137-145
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IF 4.831
Dai Liming,Du Xiaojiao,Jiang Ding,Chen Wei,Zhu Mingyue,Wang Kun
The authors have coupled ultrafine α-Fe 2 O 3 nanocrystals to N-doped graphene (NG) to obtain a novel material for use in a photoelectrode. The presence of NG is shown to strongly affect the morphology and size of the α-Fe 2 O 3 nanocrystals formed on the NG sheets, and to improve their photoelectrochemical (PEC) activity. Interestingly, the PEC performance of the nanocomposite is closely correlated to the size of the α-Fe 2 O 3 nanocrystals in that small nanocrystals display better PEC properties. The photocurrent of α-Fe 2 O 3 -NG is nearly 3.3-fold stronger than that of α-Fe 2 O 3 nanocrystals. Based on the remarkable PEC performance of this nanocomposite, a PEC sensor was constructed for the sensitive determination of 1,4-dihydroxybenzene (HQ). Its photocurrent increases with the HQ concentration in the range from 3.0 nM to 3.3 μM, and the detection limit is 1.0 nM (at an S/N ratio of 3). In our perception, the study presented here can serve as a basis for a better understanding of the relationship between morphologies and PEC performance of such nanomaterials. Conceivably, it may be extended to other PEC sensing system and to other fields associated with nanotechnology.
Ultrafine α-Fe 2 O 3 nanocrystals were prepared via coupling with N-doped graphene (NG) substances (α-Fe 2 O 3 -NG). They exhibit superior photoelectrochemical (PEC) performance and have been successfully utilized for PEC-based sensing.
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RSC Advances
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2015
·Vol. 5
·期 65
·52369-52381
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IF 3.84
Zhanchao Liu,Zhaoyong Hu,Yan Liu,Minjia Meng,Liang Ni,Xiangguo Meng,Guoxing Zhong,Fangfang Liu,Yanmin Gao
Utilising a general protocol for making surface-imprinted core–shell microparticles via a RAFT-mediated approach, we developed a Cu(II) imprinted polymer with a novel magnetic nanosphere, γ-Fe2O3@meso-SiO2, as support. Attributed to the controlled/living polymerization mechanism of the RAFT polymerization process, the Cu(II) imprinted polymer prepared by RAFT polymerization (IIP-RAFT) presented a more well-defined morphology, more mono-dispersed properties, and much higher magnetic responsiveness, compared to the Cu(II) imprinted polymer prepared by traditional free-radical polymerization (IIP-TP). Moreover, in the static saturation binding experiments, a higher binding capacity of IIP-RAFT (210 mg g−1) than IIP-TP (145 mg g−1) was also found. Afterwards, a series of adsorption experiments were carried out to systematically evaluate the adsorption performance of the as-prepared IIP-RAFT. And the results showed that IIP-RAFT exhibited excellent selectivity, good reusability and desirable dynamic adsorption behavior, and could be an ideal candidate for SPE sorbents for the removal of Cu(II) in real wastewater.
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Surfaces and Interfaces
·
2024
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IF 5.7
Bo Wang,Cheng Zhang,Bo Huang,Haoguang Wang,Xinrui Miao,Wenli Deng
A facile approach to prepare superhydrophobic fabric with high adhesive ability towards water droplets was developed via a simple dip-coating method. Immersing the cotton fabric (CF) into the γ-Fe 2 O 3 /epoxy resin/lauric acid (FEL) suspension for several minutes, followed by heat curing at 80 °C for 2 h, the superhydrophobic fabric (CF-FEL) was obtained. The quality ratio of γ-Fe 2 O 3 to epoxy resin effect on superhydrophobicity of°F-FEL was discussed. The water contact angle was 156° when 0.15 g γ-Fe 2 O 3 particles were applied. Based on the sticky water adhesion, the CF-FEL could be utilized to realize the transportation of water droplet without mass loss. Meanwhile, due to the capillary force and stagger fibers, the CF-FEL exhibited excellent separation flux and efficiency to separate heavy oil/water mixtures. The mechanical durability of the CF-FEL was also evaluated through tape peeling and rubbing test, which further indicated the feasibility of practical application. Moreover, the CF-FEL showed superior flame retardancy because it inherited the thermal stability property of epoxy resin and γ-Fe 2 O 3 particles. Thus, the prepared CF-FEL is multifunctional and the preparation method is facile and environmentally friendly.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Zhenyu Yan,Wenyu Gao,Chenkai Zhong,Qiangqiang Jiao,Shujie Tian,Jia Liu
Ammonia (NH 3 ) plays an important role in agricultural production and is also an ideal zero-carbon energy source in sustainable hydrogen economy. Electrocatalytic nitrate (NO 3 - ) reduction reaction can simultaneously consume nitrogen pollutants in water during the synthesis of NH 3 , which is the most promising and gentle alternative process to the Haber-Bosch. However, due to the interference of hydrogen evolution reaction and high overpotential, the development of efficient directional ammonia conversion catalysts has become the key. In this study, Mo-Fe 2 O 3 material were fabricated by crystal face engineering and orbital manipulation strategies. The (001) face of α-Fe 2 O 3 with the best electrochemical performance was exposed by thermodynamic control, and the in-situ substitution of Mo single atoms for near-surface Fe atoms was further used to achieve excellent ammonia synthesis activity. NH 3 yield of 493.67 μg/h/mg cat and Faraday efficiency of 95.0% were achieved at -0.5 V vs. RHE (pH=7, 0.1 M PBS+500 ppm NO 3 - ). The mechanistic analysis showed that the highly electronegative Mo atoms induced strong interaction by Fe-O-Mo bond, which prompted Fe(III) to preferentially fill the lower t2g orbital and form a low-spin state. The weaker anti-bonding state enhances the interaction between Fe(III) and the coordinating O atoms in NO 3 - , thereby strengthening electron transfer. In summary, the targeted regulation of the crystal facet and electronic orbitals of catalysts presents a promising strategy for enhancing the conversion of NO 3 - to NH 3 .
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APPLIED SURFACE SCIENCE
·
2023
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IF 6.7
Tingting Zhang,Xing Liu,Yanqiu Jiang,Xiaowei Zheng,Jian Zhang,Yudong Li,Defeng Li,Kaifeng Lin
Photo-Fenton reaction has received increasing attention in removing antibiotics in water. Herein, Fe 2 O 3 -on-ZrO 2 polypods were designed and synthesized via metal organic frameworks (MOFs) derivation strategy combined with reflux heating and baking. The experimental results showed that under Ultraviolet–visible (UV–vis) light irradiation, more than 95 % tetracycline hydrochloride (TC-HCl) was degraded by Fe 2 O 3 -on-ZrO 2 with Fe/Zr mole ratio of 1.3 in 25 min within full pH range. Mainly due to the following points, there were abundant Fe 2 O 3 -on-ZrO 2 heterojunctions, which conduced to transfer photo-induced electrons (e − ) from ZrO 2 to Fe 2 O 3 , thus accelerating the iron cycle. Besides, OH – adsorbed was oxidized to hydroxyl radicals (·OH) by holes (h + ) in the valence band (VB) of ZrO 2 , and ZrO 2 also enhanced the stability of the catalyst and reduced the leaching of iron ions. Finally, the reasonable degradation pathway and degradation mechanism were speculated by high performance liquid chromatography-mass spectrometry (HPLC-MS), electron spin resonance technology (ESR), scanning Kelvin probe (SKP), the conduction band (CB) and VB positions of Fe 2 O 3 -on-ZrO 2 , etc. This work exhibited a new structure and degradation mechanism, which would further encourage researchers to study the rational regulation of materials with special morphology and structure.
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ACS ES&T Engineering
·
2023
·
IF 7.1
Dazhong Yang,Qiuyue Ge,Xuezhen Feng,Ranhao Wang,Shangying Li,Wenfei Wei,Renji Zheng,Juan Zhang,Hong Chen
Herein, we developed a universal “soil for soil remediation” strategy to utilize soil resources for cation-/anion-type heavy-metal-contaminated soil remediation. The representative natural soils fetched from 12 different areas in China have been universally converted into Fe2O3-CAN (hydroxycancrinite) zeolite composite materials. Furthermore, we discover that due to the presence of exchangeable Na+ and OH– in CAN channels together with the intrinsic surface adsorption function of Fe2O3-CAN, Fe2O3-CAN holds distinctive cation/anion dual ion-exchange functions and strong adsorption capacity, which could synergistically remediate cation-/anion-type HM-contaminated soil. When 25 g/kg Fe2O3-CAN is added into Cd/As polluted soil (100–200 ppm), Cd2+ and AsO2– in soil could be immobilized simultaneously and the Cd/As bioaccumulation in the harvested vegetables is dramatically suppressed with reduction ratios of 48.1–67.0%, effectively reducing the HM enrichment in the phytosphere. Overall, this work confirms the high universality of Fe2O3-CAN synthesis using different types of natural soils and demonstrates that the as-synthesized Fe2O3-CAN composite material can be further effectively used for soil remediation. The “soil for soil remediation” strategy developed here could improve the flexibility and economy of soil remediation, which can be extended to a broad range of locations worldwide.
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