ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Tian-Zhu Shi,Yu-Long Feng,Tao Peng,Bao-Guo Yuan
Fe 2 O 3 is one of promising negative materials for supercapacitors (SCs), because of its low cost and high theoretical value of specific capacitance. However, the inferior conductivity and insufficient ionic diffusion rate of Fe 2 O 3 will seriously hinder the electrochemical performance of Fe 2 O 3 , resulting in limiting its practical application in SCs. Herein, a sea urchin-like 3D Fe 2 O 3 was synthesized via hydrothermal methods. And then, the 2D Ti 2 C 3 T x MXene nanosheets with high conductivity closely self-assemble on the surface of Fe 2 O 3 to provide efficient pathways for the rapid electrons transport. In addition, the sea urchin-like structure of Fe 2 O 3 can facilitate the rapid diffusion of the electrolyte to accelerate faradaic reaction. The optimized Fe 2 O 3 /MXene composite as electrode material exhibits a high specific capacitance of 486.3 F g −1 at current density of 1 A g −1 , and excellent cycling stability with 95.7% capacity retention after 5000 charge/discharge cycles. Furthermore, an asymmetric supercapacitors (ASCs) device was assembled by using Fe 2 O 3 /MXene composite as anode and MnO 2 as cathode, showing a high energy density of 32.2 Wh kg −1 at the power density of 900.6 W kg −1 , and remarkable long-term durability (95.7 % capacitance retention after 5000 cycles). This work demonstrates an effective approach of integrating the sea urchin-like Fe 2 O 3 with 2D MXene nanosheets to fabricate Fe 2 O 3 /MXene composite for high-performance SCs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Shuang Pan,Chang Liu,Yanchao Li,Can Wang,Xiaoya Cui,Ning Liu,Cong Zhang,Israel Hakizimana,Xin Zhao,Weidi Liu,Yanan Chen
Heterogeneous electro-Fenton (EF) is a promising advanced oxidation process for refractory wastewater treatment. However, typical calcination or hydrothermal method for heterogeneous EF cathode fabrication is time-consuming, energy-consuming, or harmful to the environment. High-temperature shock (HTS) technique is a novel and rapid material synthesis method with the advantages of low-cost, eco-friendly. In this study, the electrodes named Fe 2 O 3 @C/carbon cloth (Fe 2 O 3 @C/CC), were synthesized by HTS for the first time within an extremely short time (∼5 s). The Fe 2 O 3 nanoparticles with an average diameter of 61.90 ± 15.09 nm are uniformly dispersed on carbon cloth (CC) with the confinement and protection of the carbon layers. The as-prepared Fe 2 O 3 @C/CC cathode exhibited excellent electrocatalytic properties in the EF system. The removal efficiency of methylisothiazolinone (MIT) could reach 90.60 ± 1.70% in 40 min at a low current density of 1.11 mA cm −2 under the oxidation of the hydroxyl radical. In addition, the degradation pathways of MIT were further studied. According to the results of theoretical calculation, the –S–N– bond is the primary active site attacked during MIT degradation process. Therefore, heterocyclic loop opening is the main pathway of MIT degradation. HTS is an ultrafast and convenient potential technique compared with other cathode synthesis methods.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-8
·
IF 16.6
Liu Changhao,Zhang Ningsi,Li Yang,Fan Rongli,Wang Wenjing,Feng Jianyong,Liu Chen,Wang Jiaou,Hao Weichang,Li Zhaosheng,Zou Zhigang
Durability is one prerequisite for material application. Photoelectrochemical decomposition of seawater is a promising approach to produce clean hydrogen by using solar energy, but it always faces the problem of serious Cl − corrosion. We find that the main deactivation mechanism of the photoanode is oxide surface reconstruction accompanied by the coordination of Cl − during seawater splitting, and the stability of the photoanode can be effectively improved by enhancing the metal-oxygen interaction. Taking the metastable β -Fe 2 O 3 photoanode as an example, Sn added to the lattice can enhance the M–O bonding energy and hinder the transfer of protons to lattice oxygen, thereby inhibiting excessive surface hydration and Cl − coordination. Therefore, the bare Sn/ β -Fe 2 O 3 photoanode delivers a record durability for photoelectrochemical seawater splitting over 3000 h.
研究领域:
材料科学
·
光电化学
·
可再生能源
✓ 已验证
DOI
高影响因子
Nature Energy
·
2021
·Vol. 6
·期 6
·614-623
·
IF 60.858
Gao Ruijie,Wang Jian,Huang Zhen-Feng,Zhang Rongrong,Wang Wei,Pan Lun,Zhang Junfeng,Zhu Weikang,Zhang Xiangwen,Shi Chengxiang,Lim Jongwoo,Zou Ji-Jun
Platinum is the archetypal electrocatalyst for oxygen reduction—a key reaction in fuel cells and zinc–air batteries. Although dispersing platinum as single atoms on a support is a promising way to minimize the amount required, catalytic activity and selectivity are often low due to unfavourable O 2 adsorption. Here we load platinum onto α-Fe 2 O 3 to construct a highly active and stable catalyst with dispersed Pt–Fe pair sites. We propose that the Pt–Fe pair sites have partially occupied orbitals driven by strong electronic coupling, and can cooperatively adsorb O 2 and dissociate the O=O bond, whereas OH* can desorb from the platinum site. In alkaline conditions, the catalyst exhibits onset and half-wave potentials of 1.15 V and 1.05 V (versus the reversible hydrogen electrode), respectively, mass activity of 14.9 A mg −1 Pt (at 0.95 V) and negligible activity decay after 50,000 cycles. It also shows better performance than 20% Pt/C in a zinc–air battery and H 2 –O 2 fuel cell in terms of specific energy density and platinum utilization efficiency.
研究领域:
催化
·
电化学
·
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Xiao Wang,Tongkai Wang,Guangkuo Si,Yang Li,Shouwei Zhang,Xiaolong Deng,Xijin Xu
Surface oxygen vacancy defects (OV) are regarded to be beneficial to the gas sensing behavior by significantly improving the carrier density and providing more oxygen adsorption sites. In this work, Ce-doped α-Fe 2 O 3 composites with abundant OV defects were synthesized using an oil bath method assisted with annealing treatment. Morphological characterization results indicate that the lamellar architecture of α-Fe 2 O 3 is transformed to nanospheres composed of massive nanoparticles with small sizes (7–9 nm) after introducing Ce elements. Gas sensing results show that the FeCe10 (Fe/Ce = 10:1) sensors exhibit enhanced acetone sensing response of 26.3–100 ppm gas at the operating temperature of 220 °C toward that of pure α-Fe 2 O 3 . Most importantly, X-ray photoelectron spectroscopy and electron spin resonance spectroscopy results confirm that the sensing responses of Ce-doped α-Fe 2 O 3 sensors are directly related to the OV defects, that is, the larger the quantity of the OV defects, the higher the sensing response. The unpaired electrons trapped in OV defects can provide more active sites for adsorption of oxygen and acetone molecules, resulting in a thicker depletion layer and a higher potential barrier. Our work highlights the decisive role of OV defects in gas sensors, which can also provide a rational approach to boost the sensing performance.
研究领域:
材料科学
·
传感器技术
·
纳米材料
·
表面化学
·
半导体物理
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Zhengliang Deng,Yajun Wang,Ruihua Liu,Wenyu Li,Qiang Gan
In order to improve the overall performance of traditional thermite, Al/B/Fe 2 O 3 composite thermites were synthesized using electrophoretic deposition technology. The morphology, structure, composition, thermal reaction properties, reaction process, and reaction activity were investigated using X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), X-ray energy dispersive spectrometry (EDS), X-ray diffractometer (XRD), and simultaneous thermal analyzer (TG-DSC). The results indicate that the components of the prepared Al/B/Fe 2 O 3 composites were uniformly distributed and closely interconnected, with the preparation process not altering the composition and structure of the components. Compared with Al/B/Fe 2 O 3 thermite prepared by physical mixing and Al/Fe 2 O 3 thermite by electrophoretic deposition, the Al/B/Fe 2 O 3 thermite prepared by electrophoretic deposition exhibited a lower reaction onset temperature (524.9 ℃), higher heat release (1240.9 J·g −1 ), and greater reactivity ( E a =168.3 kJ·mol −1 ). These findings underscore the significant enhancement effect of boron addition and the electrophoretic deposition method on the overall performance of Al/Fe 2 O 3 thermite. Analysis of the reaction mechanism reveals that the Al/B/Fe 2 O 3 composite thermites underwent a series of complex transformations, including thermite reactions, alloying reaction between Al and B, direct oxidation reactions of Al, B, Fe, and nitriding reaction of B, within the temperature range of thermal analysis from room temperature to 1100 ℃. These results provide crucial support for material innovation, performance optimization, and application expansion of thermites.
研究领域:
材料科学
·
化学工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2023
·Vol. 34
·期 14
·145703
·
IF 3.5
Mei Wu,Hongchang Wang,Xiaohui Liang,Dunhui Wang
Core–shell structures and interfacial polarization are of great significance to meet the diversified requirements of microwave attenuation. Herein, α-Fe2O3@MoS2 nanocomposites are fabricated via a simple two-step hydrothermal process, in which MoS2 nanosheets as the shell are self-assembled and α-Fe2O3 microdrums are used as the core to constitute a special flower-like morphology with core–shell structure. This structure can provide more interface contact to achieve strong interfacial polarization and possibly offer more multiple reflection and scattering of electromagnetic waves. Furthermore, the microwave dissipation performances of α-Fe2O3@MoS2 nanocomposites can be significantly improved through construction of core–shell structure and flower-like morphology, controlling the content of α-Fe2O3 microdrums and adjusting the filler loading ratios. This work proves that the as-synthesized nanocomposites achieve excellent effective absorption bandwidth and outstanding electromagnetic wave absorption capabilities due to their special interfaces, core–shell structures and good impedance matching conditions. Therefore, α-Fe2O3@MoS2 nanocomposites are expected to be a novel and desirable candidate for high-performance electromagnetic wave absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Taotao Liang,Xiaogang Guo,Binfang Yuan,Shuying Kong,Huisheng Huang,Daoling Fu,Fulan Zhang,Jianhua Xu,Xueming Li
The design of functional anti-wetting ceramic coatings is always a bottleneck restricting the development of ceramic techniques. This study proposes a liquid phase synthesis method to fabricate α-Fe 2 O 3 (III) ceramic powders with promising applications and introduces a facile electrophoretic deposition (EPD) technique to construct the corresponding functionalized hydrophobic films – superhydrophobic functionalized α-Fe 2 O 3 ceramic films (SFOFS) with roughly even distribution and a high water contact angle (CA) of 169°±1° – followed by heat posttreatments. The microtopography and crystalline structures of the product were investigated by FESEM, EDX , and XRD techniques. The EPD controllability of SFOFS was studied by adjusting the EPD time and the applied field strengths . In addition, the SFOFS show excellent long-term anti-wetting properties for twenty-four months after undergoing a series of tests, including soaking, water droplet impacting, immersion by droplets with different surface tensions and exposure to different gases and relative humidity conditions, etc. This study substantially helps the design of other kinds of functional anti-wetting films through the proposed convenient method beyond the oxide limit.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Xiaoxin Lv,Zixiao Deng,Menglian Wang,Jiujun Deng
Transition-metal carbides, carbonitrides , and nitrides (MXene) as an emerging two-dimensional semiconductor has open an ideal pathway for fabricating various TiO 2 -based functional materials . In this work, we demonstrate a simple and one-step heat treatment for the fabrication of Ti 3 C 2 MXene-derived carbon-doped TiO 2 /Fe 2 O 3 composite for superior lithium-ion batteries (LIBs). As an anode, the as-fabricated composite delivers an excellent lithium-ion storage of 538 mA h/g at a current density of 0.1 A/g and superior rate performance of 152.6 mA h/g at a higher current density of 5 A/g, which is 6 times higher than that of C-doped TiO 2 electrode. In addition, a remarkable cyclic stability with 88.46 % capacity retention is also obtained for the composite anode at a current density of 1 A/g after 1000 cycles. Based on various characterizations, the greatly enhanced electrochemical performance can be attributed to the synergistic effects of carbon doping, layered structures of TiO 2 , and the anchoring of Fe 2 O 3 nanoparticles , which effectively promote the charge transport kinetics. This study will broaden the Ti 3 C 2 MXene application in LIBs and meanwhile provide an alternative method for synthesizing more efficient anode materials .
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 33
·13705-13712
·
IF 0
Zewen Fu,Tengfei Jiang,Lijing Zhang,Bingkun Liu,Dejun Wang,Lingling Wang,Tengfeng Xie
In this paper, we present the fabrication of Ti-doped α-Fe2O3 and surface treatment with Al3+ for application as a photoanode in photoelectrochemical water splitting. The Ti-doped α-Fe2O3 with Al3+ treatment shows a 100 mV cathodic shift of the onset potential and a notable improvement of the photocurrent density. The samples were characterized by SEM, TEM, HRTEM, XRD, Raman, UV-vis and XPS to obtain the information after surface treatment. Based on electrochemistry and photoelectrochemistry techniques, it appears that surface treatment with Al3+ passivates the surface states and decreases the accumulation of charge at the surface of Ti–Fe2O3. The results show that Ti-doped Fe2O3 with Al3+ surface treatment can be used as an efficient photoanode for photoelectrochemical water splitting.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Bingbing Hu,Chuanlan Xu,Muhammad Kashif Aslam,Yuan Cen,Jiahong Hu,Yan Li,Yuping Liu,Chaozhong Guo,Danmei Yu,Changguo Chen
In this work, multilayer networks lanthanum-doped V 2 O 5 · n H 2 O@OAB (noted as La-VOH@OAB) binder-free thin film positive electrode has been first successfully synthesized via a simple and economical sol-gel and drop-coating methods. Benefiting from its unique architecture and the favorable synergetic contributions for rare earth metal ions of La 3+ and hydrophilic carbon of OAB, after the condition optimization, the 20%La-VOH@OAB-4 exhibits an excellent electrochemical performance with an ultrahigh specific capacitance of 612 F g −1 at a current density of 1 A g −1 , good rate capability (81.1%, the current density increases tenfold) and outstanding cycling stability (90.4% capacitance retention over 2000 cycles). In addition, flexible Fe 2 O 3 @rGO binder-free thin film negative electrode prepared with the similarly facile strategy demonstrates a high specific capacitance of 366 F g −1 due to Fe 2 O 3 nanoparticles tightly anchored on the rGO surface. The assembled 20%La-VOH@OAB-4//Fe 2 O 3 @rGO ASCs device within a voltage window of 1.7 V delivers a relatively high specific energy density of 56.3 Wh kg −1 at a power density of 849.9 W kg −1 with exceptional cycling stability (81.3% capacitance retention after 5000 cycles), moreover, two ASCs devices in parallel can light up a red LED for 3 min, demonstrating its potential in practical applications. This work provides a certain reference for the fabrication of environmentally friendly thin film electrodes for developing high efficient energy storage systems.
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
CHEMOSPHERE
·
2023
·
IF 8.8
Yuanqing Guo,Quan Liu,Xiaobin Tang,Heng Liang,Guibai Li,Liwei Yang,Lu Wang,Xiaoling Li,Yan Sun
A photocatalytic membrane coated with α-Fe 2 O 3 /Fe 3 O 4 nanoparticles has been developed to address the challenges of membrane fouling and organic removal in the treatment of natural surface water. The photocatalytic and filtration properties of the membranes were investigated through a variety of methods. The successful preparation of iron oxide was confirmed by UV–vis diffuse reflectance spectra and X-ray diffractometry, with α-Fe 2 O 3 identified as the primary photocatalytic agent. A commercial ultrafiltration (UF) membrane was employed as a comparison to evaluate the photocatalytic performance and filtration properties of the modified membrane. Results showed that the photocatalytic membrane achieved better removal rates for UV 254 (22.0%) and specific fluorescent organic compounds, such as component 2 (19.38%) and component 3 (16.89%), compared to the control group. Furthermore, both irreversible and reversible fouling resistances of the prepared membranes were significantly lower than that of the control group, with reductions of 39.4% and 50.2%, respectively. The membrane coated with α-Fe 2 O 3 /Fe 3 O 4 nanoparticles exhibited moderate removal of protein-like and terrestrially derived humic-like fluorescent organics while controlling membrane fouling. Although the α-Fe 2 O 3 /Fe 3 O 4 nanoparticles-coated photocatalytic membrane demonstrated good anti-fouling properties, the removals of organic matters were not as effective as anticipated due to the shorter hydraulic retention time. This study provides valuable insights for enhancing pollutant degradation and anti-fouling properties of membranes through the utilization of solar photocatalytic α-Fe 2 O 3 /Fe 3 O 4 surface-modified membranes in the treatment of natural surface water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）