COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Nan Wang,Bin Han,Jianbo Wen,Mingwei Liu,Xinjun Li
A novel Mn-doped Fe 2 O 3 modified g-C 3 N 4 nanosheets composite has been prepared for overall water splitting. Structure characterizations reveal that the Mn are successfully doped in the Fe 2 O 3 nanoparticle and a close interface between g-C 3 N 4 and Mn-doped Fe 2 O 3 is obtained. The optimized FMC-10 photocatalyst has a H 2 evolution of 51 μmol h −1 . The improved photocatalytic performance can be ascribed to the synergy effect of both Mn-doped Fe 2 O 3 and g-C 3 N 4 . Doping Fe 2 O 3 with Mn promotes photo-induced charges and increases the charge transfer for the improved conductivity of the bulk Fe 2 O 3 , while favorable contacting with g-C 3 N 4 enhances the charge separation ability.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 14
·8332-8339
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IF 3.119
Pinhua Zhang,Hongyang Zhu,Kaifeng Xue,Li Chen,Changmin Shi,Dongchao Wang,Jianfu Li,Xiaoli Wang,Guangliang Cui
2D heterostructures are promising gas sensor materials due to their surface/interface effects and hybrid properties. In this research, Cu2O/Fe2O3 heterostructure ordered arrays were synthesized using an in situ electrodeposition method for H2S detection at low temperatures. These arrays possess a periodic long range ordered structure with horizontal multi-heterointerfaces, leading to superior gas sensitivity for synergistic effects at the heterointerfaces. The sensor based on the Cu2O/Fe2O3 heterostructure ordered arrays exhibits a dramatic improvement in H2S detection at low temperatures (even as low as −15 °C). The response is particularly significant at room and human body temperatures since the conductivity of the arrays can change by up to three orders of magnitude in a 10 ppm H2S atmosphere. These good performances are also attributed to the formation of metallic Cu2S conducting channels. Our results imply that the Cu2O/Fe2O3 heterostructure ordered arrays are promising candidates for high-performance H2S gas sensors that function at low temperatures as well as breath analysis systems for disease diagnosis.
研究领域:
材料科学
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传感器技术
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气体检测
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 16
·7704-7710
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IF 3.925
Yaqi Wang,Zhihu Pan,Xiaohong Ji
Among transition-metal oxides, vanadium oxides and iron oxides have attracted much attention for electrochemical energy storage devices due to their high theoretical specific capacities and multiple variable valence states of V and Fe. However, the poor conductivity of both oxides leads to poor rate performance and high charge transfer resistance between the electrolyte and electrodes. Herein, Ti3C2Tx-wrapped V2O5/Fe2O3 (VFO) composites were designed and prepared for achieving enhanced electrochemical performance. The VFO composites on carbon cloth were synthesized by a hydrothermal method, and the optimized VFO electrode exhibited a capacitance of 435.2 mF cm−2 at a current density of 2 mA cm−2. By wrapping with Ti3C2Tx, the areal capacitance of the VFO composite electrode was greatly enhanced up to 1150.82 mF cm−2 at a current density of 2 mA cm−2. The enhanced electrochemical performance of the Ti3C2Tx@VFO composites is mainly attributed to the synergistic effects of the improved conductivity and diminished collapse and falling off of VFO during the charging and discharging processes. For practical application, asymmetrical supercapacitor (ASC) MnO2//Ti3C2Tx@VFO devices were constructed. The device exhibited a maximum energy density of 0.17 mW h cm−2 at a power density of 1.26 mW cm−2 with a capacitance retention of 74.92% after 5000 cycles. This work indicates the potential application of various oxides in high-performance supercapacitors by modification with MXenes.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 15
·155705
·
IF 3.953
Xing Zhang,Hao Chen,Wei Zhang,Lina Zhang,Xinyu Liu,Jinwen Ma,Shichong Xu,Haibo Li
Exploring and fabricating a suitable photoanode with high catalytic activity is critical for enhancing photoelectrochemical (PEC) performance. Herein, a novel 3D hierarchical Fe2O3/SnO2 photoanode was fabricated by a hydrothermal route, combining with an annealing process. The morphology, crystal structure were studied by scanning electron microscopy, transmission electron microscopy, x-ray photon spectroscopy, and x-ray diffraction, respectively. The results reveal the successful preparation of Fe2O3 nanothorns on the surface of SnO2 nanosheets. The as-fabricated 3D Fe2O3/SnO2 photoanode yields obviously promoted PEC performance with a photocurrent density of approximate 5.85 mA cm−2, measured in a mixture of Na2S (0.25 M) and Na2SO3 (0.35 M) aqueous solution at 1.23 V (versus reversible hydrogen electrode, RHE). This value of photocurrent is about 53 times higher than that of the bare SnO2 photoanode. The obvious improved PEC properties can be attributed to the 3D Fe2O3/SnO2 heterostructures that offer outstanding light harvesting ability as well as improved charge transport and separation. These results suggest that exploring a suitable 3D hierarchical photoanode is an effective approach to boost PEC performance.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Qingchun Gao
Photogenerated cathodic protection as a new type of corrosion protection method has evoked great attention. The n-type semiconductor is normally selected as the photogenerated cathodic protection composite. α-Fe 2 O 3 is a typical n-type semiconductor, which is easy to obtain and environmental-friendly. However, it is normally prepared on the FTO substrate and could hardly protect carbon steel. In this study, α-Fe 2 O 3 nanotubes are fabricated on carbon steel by anodic oxidation method at different oxidation potentials. The corresponding surface morphologies, compositions, and optical absorption properties are characterized with SEM, Raman spectroscopy, and UV-Visible spectrometer. The photoelectrochemical tests show that the prepared α-Fe 2 O 3 can supply cathodic protection to carbon steel. The maximum photogenerated potential drop is obtained for the α-Fe 2 O 3 sample prepared under 50 V at 30 ℃ for 450 s anodic oxidation. It is revealed that the fine structure is benefit to capture light and enhances the photogenerated cathodic protection performance to carbon steel.
研究领域:
材料科学
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腐蚀防护
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光电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Gang Chen,Ruonan Tian,Qiaolin Li,Tiantian Cao,Huai Tan,Hongtao Guan,Chengjun Dong,Elisabetta Comini
Design sensing materials with core-shell structure is an excellent strategy to achieve high sensing performance toward acetone detection. Herein, MIL-88A(Fe) was fabricated via a hydrothermal route, which renders as a template to fabricate Fe 2 O 3 @In 2 O 3 core-shell spindles structure. Gas sensing results show that the sensor based on Fe 2 O 3 @In 2 O 3 exhibit enhanced response of 193–200 ppm acetone than that of 36 for pristine Fe 2 O 3 at 200 °C. After Pt functionalization, the response of Fe 2 O 3 @In 2 O 3 /Pt to 200 ppm acetone is up to 839 at a reducing working temperature of 180 °C with a good selectivity and long-term stability. A synergistic mechanism originated from the intrinsic merits of Fe 2 O 3 and In 2 O 3 , the 1D core-shell structure, the creation of heterojunction at the interface of Fe 2 O 3 and In 2 O 3 and the creation of Shottky junction at In 2 O 3 and Pt nanoparticles, and the catalytic reaction of Pt holds accountable for the significant improvement in acetone sensing.
研究领域:
材料科学
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化学传感
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Sen Cui,Kai Song,Houjiang Liu,Hongyan Li,Yufei Zhang,Weijie Ren,Rui Zhang,Kun Li,Fang He,Zhenxing Qin,Huilin Hou
Photoelectrochemical (PEC) water splitting for hydrogen production is a promising technology for sustainable energy generation. In this work, we introduce Nd sites boost the PEC performance of Fe2O3 photoanodes through a precise gas-phase cation exchange process, which substitutes surface Fe atoms with Nd. The incorporation of Nd significantly enhances charge transfer properties, increases carrier concentration, and reduces internal resistance, leading to a substantial increase in photocurrent density from 0.44 to 0.92 mA cm–2 at 1.23 VRHE. Further enhancement of catalytic activity was achieved by depositing a NiCo(OH)x layer and a photocurrent density of 1.15 mA cm–2 at 1.23 VRHE were obtained. Theoretical calculations corroborate these experimental results, revealing that Nd doping narrows the bandgap, improves charge separation efficiency, and lowers the reaction potential barrier, thereby accelerating water oxidation kinetics. These findings underscore the effectiveness of surface cation exchange and targeted metallic element doping in overcoming the intrinsic limitations of Fe2O3, providing a viable pathway for developing high-performance PEC systems for efficient hydrogen production.
研究领域:
材料科学
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可再生能源
·
理论计算
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Shiyu Jia,Ziyang Liu,Yuanpan Gao,Ruoran Zhang,Rui Zhu,Shanshan Gao,Peipei Guan,Xuanran Geng,Ke Tian,Shouli Bai
The design of photoanode materials to achieve efficient water splitting is a current research hotspot in photoelectrochemical (PEC). In this work, we designed and prepared an α-Fe 2 O 3 /BiVO 4 heterostructure modified by carbon quantum dots ((α-Fe 2 O 3 /BiVO 4 /CQDs)) as the photoanode. The modification of CQDs can broaden the sunlight absorption ability and dramatically enhance the water oxidation kinetics of α-Fe 2 O 3 /BiVO 4 /CQDs. The optimized photoanode demonstrated a photocurrent density of 1.32 mA·cm −2 at 1.23 V vs. RHE, which is 2.2 times than pristine α-Fe 2 O 3 (0.6 mA·cm −2 ) photoanode. The IPCE value above 29.4 % at 400 nm, and the onset potential is negatively shifted by 243 mV for α-Fe 2 O 3 /BiVO 4 /CQDs. The improved performance is mainly due to the α-Fe 2 O 3 /BiVO 4 heterojunction to achieve effective separation of photogenerated carriers in the bulk phase and CQDs to improve light utilisation and OER kinetics of the photoanode.
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
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Qin Hao,Caixia Xu,Suzhen Jia,Xiaoyun Zhao
Fe 2 O 3 nanoparticles are employed as a coating material to optimize the electrochemical performance of LiCoO 2 at high voltage. When the current rate is 1 C with the cutoff potential at 4.5 V, the 5 wt.% Fe 2 O 3 -coated LiCoO 2 delivers an initial capacity of 168.7 mAh g −1 . More importantly, its capacity retention after 50 cycles reaches up to 92.6%, whereas the value for pristine LiCoO 2 is only 58.5%. The electrochemistry impedance spectroscopy analysis demonstrates that Fe 2 O 3 coating plays an important role in decreasing the charge transfer resistance of cell. Compared with the performance of the Fe 2 O 3 -mixed and Fe-doped LiCoO 2 samples, it is found that the role of Fe 2 O 3 coating is unique, which may change the characteristic of the surface of LiCoO 2 particles. This technique may provide an effective and convenient way for optimizing other electrode materials .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH INNOVATIONS
·
2015
·
IF 0.83
X. L. Zou,S. L. Gu,G. Q. Lai,C. Y. Lu,X. L. Xie,X. G. Lu,Z. F. Zhou
The electrodeposition of nano-iron films from Fe2O3 precursor in an ionic liquid composed of 33·3 mol-% choline chloride (ChCl) and 66·7 mol-% ethylene glycol (EG) has been investigated. The electrodeposition process was carried out at 1·5–1·9 V and 60–120°C for 3 hours. The influences of experimental parameters on the electrodeposition process and the morphology of the deposited nano-iron films were studied. The results show that compact and uniform nano-iron (particle size is approximately 100–200 nm) films can be electrodeposited in the Fe2O3-saturated ChCl-EG ionic liquid at 1·8–1·9 V and 60–120°C. The electrodeposition temperature and applied potential have significant influences on the characteristics of the deposited nano-iron films and the electrodeposition process. It is suggested that the controllable electrodeposition process can be used to prepare nano-iron films with various particle sizes from Fe2O3 in CHCl-EG eutectic melt.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2013
·
IF 3.473
Fei Ji,Chaolin Li,Xiyu Wei,Jie Yu
Porous Fe 2 O 3 particle was synthesized by the hydrothermal-calcination method and then used to activate peroxymonosulfate (PMS) for Rhodamine B (RhB) decolorization. Several analytical means such as X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and N 2 physisorption were used to determine the characteristics of the catalyst particles. The results of experiments indicated that the catalyst showed a high activity in decolorization of RhB in the presence of PMS. Several key parameters including initial pH, amounts of catalyst, PMS concentration, and temperature were investigated in order to understand their effect on the decolorization efficiency. Furthermore, the catalyst showed good reusability and stability after three recycles. Finally, the free radicals participating in the process were classified by radical quenching studies, and a rational mechanism was proposed based on the results obtained to understand the catalytic process.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 81
·51512-51520
·
IF 3.108
Minmin Liu,Lin Zhang,Bei-dou Xi,Shuili Yu,Xiaojun Hu,Li-an Hou
The activation of persulfate (PS) by metal catalysts under visible light is expected to offer a promising oxidation reaction for the removal of contaminants from water. Herein, we investigated activated PS systems under visible light irradiation for the generation of reductive species to decompose ciprofloxacin (CIP). Improved PS activation using TiO2/Fe2O3/zeolite ((n)TiFeZ) under visible light irradiation favorably leads the reaction to generate reductive radicals. The enhanced degradation efficiencies of the (n)TiFeZ–PS system for CIP removal was due to the extended absorbance in the visible-light region and improved space separation of photo-induced charge carriers. The (4)TiFeZ catalyst exhibited better performance for CIP removal as compared to the other samples. The CIP was completely degraded in 120 min using 1 g L−1 (4)TiFeZ and 5.0 mM PS at pH 7.0. The characterization and electron paramagnetic resonance (EPR) of (n)TiFeZ suggested that CIP was mainly degraded by surface-adsorbed radicals generated from the reaction between PS and Fe(II) on the samples under visible light. The reductive systems coupled with (n)TiFeZ exhibited high CIP degradation efficiency and high potential for the decomposition of other antibiotic compounds.
研究领域:
环境科学
·
化学工程
✓ 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）