JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Meng Zhou,Wenjie Zhao,Qiming Yan,Heqing Fu
The design of multiple heterogeneous interfaces has been proven to be a successful strategy to boost microwave absorption performance. However, the synthesis of magnetic microwave absorber with wide absorption bandwidth is still a challenge. In this work, ZnO@MWCNTs@NiFe 2 O 4 nanocomposites are fabricated by introducing ZnO on the surface of MWCNTs and subsequent anchoring of NiFe 2 O 4 . The minimum reflection loss can reach − 45.5 dB at 12.4 GHz with a thickness of 2 mm, while the broadest efficient absorption bandwidth is above 6.4 GHz at only a 3 mm thickness. Furthermore, the microwave absorption performance of ternary nanocomposites can be optimized by tunable the content of ZnO and NiFe 2 O 4 , whose microwave absorption mechanism depends on the synergy of dielectric loss and magnetic loss. The formation of 3D conductive network and heterogeneous interfaces contributes to the enhancement of conductive loss and polarization, respectively. The experimental results demonstrated that the ZnO@MWCNTs@NiFe 2 O 4 nanocomposites can provide a guide for microwave absorbers with wide absorption bandwidth in the future.
研究领域:
材料科学
·
电磁学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yuan-li Wang,Tong-hui Yang,Song Yue,Hang-bo Zheng,Xiao-pan Liu,Peng-zhao Gao,Hang Qin,Han-ning Xiao
Composition optimization, structural design, and introduction of external magnetic fields into the catalytic process can remarkably improve the oxygen evolution reaction (OER) performance of a catalyst. NiFe2O4@(Ni, Fe)S/P materials with a heterogeneous core–shell structure were prepared by the sulfide/phosphorus method based on spinel-structured NiFe2O4 nanomicrospheres. After the sulfide/phosphorus treatment, not only the intrinsic activity of the material and the active surface area were increased but also the charge transfer resistance was reduced due to the internal electric field. The overpotential of NiFe2O4@(Ni, Fe)P at 10 mA cm–2 (iR correction), Tafel slope, and charge transfer resistance were 261 mV, 42 mV dec–1, and 3.163 Ω, respectively. With an alternating magnetic field, the overpotential of NiFe2O4@(Ni, Fe)P at 10 mA cm–2 (without iR correction) declined by 45.5% from 323 mV (0 mT) to 176 mV (4.320 mT). Such enhancement of performance is primarily accounted for the enrichment of the reactive ion OH– on the electrode surface induced by the inductive electric potential derived from the Faraday induction effect of the AMF. This condition increased the electrode potential and thus the charge transfer rate on the one hand and weakened the diffusion of the active substance from the electrolyte to the electrode surface on the other hand. The OER process was dominantly controlled by the charge transfer process under low current conditions. A fast charge transfer rate boosted the OER performance of the catalyst. At high currents, diffusion exerted a significant effect on the OER process and low OH– diffusion rates would lead to a decrease in the OER performance of the catalyst.
研究领域:
材料科学
·
电化学
·
催化科学
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产品关联
DOI
PubMed
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 39
·期 3
·e70008
·
IF 0
Yawen Wu,Xueying Hou,Ao Li,Ruijian Li,Qingqing Yang,Shaohua Jiang,Jing yu Hu,Qingliang You,Rui Guo
As the amount of tetrachlorobisphenol A (TCBPA) that causes potential adverse effects on human health in the environment is continually increasing. It is therefore important to develop new materials for the adsorption or degradation of these compounds using various techniques. In this study, two novel magnetic recyclable composite catalysts Zr–NiFe 2 O 4 @ZIF-67 and Zr–NiFe 2 O 4 @ZIF-8 were synthesized. These catalysts degraded tetrachlorobisphenol A (TCBPA) in water by activating peroxydisulfate (PDS)/peroxymonosulfate (PMS), respectively. The results show that the Zr–NiFe 2 O 4 @ZIF-67-5%/LED/(NH 4 ) 2 S 2 O 8 system can degrade 95% of TCBPA (20 mg/L) within 30 min, whereas the Zr–NiFe 2 O 4 @ZIF-8-10%/LED/KHSO 5 system degrades 90% of TCBPA within 30 min. In instances of metal leaching at low concentrations, nickel and iron ions declined to 0.008 mg·L −1 , TCBPA exhibits highly efficient and sustainable catalytic properties, maintaining over 80% efficacy across six cycles. The online infrared test experiment results showed the major functional groups disappearing within approximately 130 s. The results of electron paramagnetic resonance and free-radical-quenching experiments showed that SO 4 ˙ − , ˙OH, 1 O 2 , and O 2 ˙ − were involved in the degradation of TCBPA. The possible degradation paths are isomerization polymerization, dechlorination, hydroxylation, ring-opening by oxidation, and further transformation into small molecules of acids, aldehydes, alcohols and other compounds. Thus, in this study, a reliable technique for the degradation of halogenated bisphenol compounds is developed. Overall, the photocatalytic degradation of organic pollutants in water utilizing polymetallic composites as catalysts represents an innovative approach to water treatment, demonstrating enhanced catalytic activity and recyclability, with promising prospects for significant advancements in both theoretical research and practical applications.
研究领域:
环境科学
·
材料科学
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化学工程
✓ 已验证
产品关联
DOI
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xingzhao Wang,Jiabing Luo,Yongxiao Tuo,Yufeng Gu,Wanli Liu,Shutao Wang,Yan Zhou,Jun Zhang
In this work, a heterostructure oxygen evolution reaction (OER) electrocatalyst consisting of NiFe 2 O 4 nanoflakes grown on the tip of NiCo 2 O 4 nanoneedles arrays supported on nickel foam (NCO-NNs@NFO-NFs/NF) was obtained via simultaneous cation (Co 3+ by Fe 3+ ) and ligand exchange (-OH by 1,4-benzenedicarboxylic acid) and further annealing of the hydroxide/MOF precursor in air. HRTEM and Raman characterizations confirm the formation of NCO/NFO heterostructure. XPS characterization and charge density difference calculations clarify the electron transfer from Fe to Ni and Co at the NCO/NFO heterointerface. Electrochemical tests show that NCO-NNs@NFO-NFs/NF possesses excellent OER electrocatalytic activity (overpotential of 265 mV@50 mA cm −2 ) and durability (stable for 100 h@1 A cm −2 ). NCO-NNs@NFO-NFs/NF‖20 % Pt/C two-electrode system can achieve 10 mA cm −2 at 1.398 V for anion exchange membrane (AEM) water splitting in 1.0 M KOH at 85 °C, which exceeds the activity of using commercial RuO 2 as an anode at 25 °C, combined with the stability of 100 h at 10 mA cm −2 at 25 °C, demonstrating the practical application in industrial AEM process. XPS and HRTEM characterizations of NCO-NNs@NFO-NFs/NF after the OER V - t test, along with ex-situ Raman characterization, confirm that Co and Fe sites undergo surface reconstruction to form specific CoOOH/FeOOH interfaces, as to exert the synergistic effect of Co and Fe dual active sites during OER process. DOS calculations reveal that the density of state at Fermi energy level increases after the introduction of Fe, thereby improving conductivity and facilitating the activation of adsorbed oxygen species. This study shows a significant methodology for simultaneous improvement of the electrocatalytic stability and activity of spinel oxides-based heterostructures, which is critical for practical application.
研究领域:
材料科学
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电化学
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能源转换
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yongji Xia,Tianle Mao,Xuefeng Jin,Le Wang,Jian Yan,Sheng Lin,Dong-Liang Peng,Zhaoju Yu,Guanghui Yue
The development of efficient catalysts to accelerate the three-phase reaction at the cathode side represents a crucial step in enhancing the performance of lithium-oxygen batteries (LOBs) with high energy density. In this study, NiFe 2 O 4 /CeO 2 composites with an appropriate Ce concentration were prepared as cathode catalysts for LOBs, and the unique micro-flower structure maximally exposed the active sites of the materials. The catalyst cleverly integrates the excellent oxygen evolution reaction (OER) activity of NiFe 2 O 4 and the outstanding oxygen reduction reaction (ORR) activity of CeO 2 . The high concentration of oxygen vacancies and the composite structure synergistically enhanced the charge transfer ability, altered the charge distribution of the active sites, and modulated the electronic structure of the material, thereby achieving an appropriate adsorption energy for oxygen-containing intermediates. Consequently, the composite material displays 343 stable cycles, a round-trip efficiency of 97.8 %, and a discharge specific capacity of 7478 mAh/g. Additionally, it exhibits fast charging and slow discharging capabilities for up to 726 h. This work offers insights into the design of efficient bifunctional cathode catalysts for LOBs.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 12
·5007-5016
·
IF 1.6
Wang Weiran,Wang Zhifeng
Modified chitosan-coated nickel ferrite silica nanoparticles were prepared, characterized and experimented for the removal of U(VI). Adsorption amount was 125.30 mg g −1 at pH 5.0. The magnetic chitosan based composite could be successfully recycled from uranium aqueous phase. Finally, calculated data and analysis suggested that the adsorption behaviors of magnetic chitosan based nanoparticles can be explained by pseudo-second order kinetic model ( R 2 = 0.9915), which suggested the adsorption process was probably controlled by chemical adsorption, and langmuir model ( R 2 = 0.9816), which suggested the adsorption process was probably controlled by single-layer adsorption.
研究领域:
环境科学
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纳米技术
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 60
·54964-54975
·
IF 3.289
Jian Zeng,Ting Song,Meixiang Lv,Tingting Wang,Jiayi Qin,Heping Zeng
A Au/g-C3N4/NiFe2O4 nanocomposite was successfully prepared and characterized, and it exhibited a significant visible-light-driven photoactivity for hydrogen production. The results suggested that NiFe2O4 was closely coupled with flake-like g-C3N4 and Au nanoparticles were successfully loaded onto the surface of an optimal g-C3N4/NiFe2O4 nanocomposite. Subsequently, the photocatalytic hydrogen evolution of the as-prepared sample was investigated and optimized, indicating that the optimal Au/g-C3N4/NiFe2O4 ternary nanocomposite with AuNP loading of 1.0 wt% showed the highest hydrogen generation rate of 1.607 mmol g−1 h−1, which was 30.9 times and 28.7 times higher than the values of pure NiFe2O4 and pure g-C3N4, respectively, whereas the optimized g-C3N4/NiFe2O4 binary nanocomposite with NiFe2O4 coupled at 49.4% exhibited a hydrogen generation rate of 0.351 mmol g−1 h−1. Interestingly, the photocatalytic hydrogen production mechanism was also tentatively proposed as promoted charge carrier transfer and the strong surface plasmon resonance (SPR) effect of AuNPs via PL, EIS and photocurrent measurements was verified.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 3
·602-613
·
IF 5.693
Guo Yan,Wang Dedong,Bai Tiantian,Liu Hu,Zheng Yanjun,Liu Chuntai,Shen Changyu
Two-dimensional Ti 3 C 2 T x MXene nanosheets with excellent electrical conductivity and layered structure have shown great promising in electromagnetic wave (EMW) absorption. Here, MXene nanosheets with homogeneously anchored NiFe 2 O 4 nanoparticles (NiFe 2 O 4 /MXene) were prepared using facial electrostatic self-assembling and freeze-drying technique. Interestingly, the minimum reflection loss ( RL min ) of paraffin wax-based composites with only 3% NiFe 2 O 4 /MXene reached as low as − 41.83 dB, showing much stronger EMW absorption property than that of MXene nanosheets ( RL min = − 5.03 dB) at the same loading level. This can be mainly ascribed to the existence of NiFe 2 O 4 nanoparticle that can effectively prevent the self-stacking of MXene nanosheets, causing improved conduction loss. Besides, large amounts of heterogeneous interfaces between NiFe 2 O 4 nanoparticle and MXene can also produce additional interface polarization loss. More importantly, magnetic loss arising from the magnetic NiFe 2 O 4 nanoparticle is beneficial for good impedance matching, enabling more EMW to enter into the interior of composites to be dissipated. Furthermore, effective absorption bandwidth in the frequency range of 3.44–18 GHz can be achieved by adjusting the matching thickness of composites with 5% NiFe 2 O 4 /MXene. This study paves a way for preparing high-performance MXene-based EMW absorber at ultralow loading level. Graphical abstract Electrostatic self-assembled NiFe2O4/MXene nanocomposites exhibit excellent electromagnetic wave absorption performance based on the synergistic effect of bifillers
研究领域:
材料科学
·
电磁学
·
纳米技术
✓ 已验证
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Meng Yuan,Meng Zhou,Heqing Fu
Recently, thin, lightweight, wide and strong microwave absorption performance are the main targets for researchers to design high-performance absorbers. A new two-dimension MXene material has attracted significant attention because of its unique hierarchical structure, large specific surface area and special metallic features. However, its improperly high electrical conductivity of MXene causes the bad microwave absorption performance. To meet the needs of practical application, the sandwich-like NiFe 2 O 4 @SiO 2 @MXene nanocomposites were fabricated via multilayered MXene and core-shell NiFe 2 O 4 @SiO 2 nanoparticles. By the synergistic effects from the SiO 2 (transparent medium) improving impedance matching and the two-dimensional laminated MXene increasing conductive loss, the microwave absorption performance of NiFe 2 O 4 @SiO 2 @MXene can be effectively regulated and optimized. As a result, the minimum reflection loss of NiFe 2 O 4 @SiO 2 @MXene reaches −52.8 dB at 11.6 GHz with a thickness of 2 mm, and the maximum effective absorption bandwidth is 7.2 GHz (10.8–18 GHz) covering the whole Ku-band with only a 1.5 mm thickness. It has proved that microcosmic sandwich-like structure design is an efficient approach to achieving excellent microwave absorption performance. The multiple components and unique structure generate heterogeneous interfaces, multiple reflections, polarization features and well-matched impedance. This work provides an insight for rationally constructing hybrid materials with a complex structure in the application of microwave absorption field.
研究领域:
材料科学
·
电磁学
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 29
·10203-10211
·
IF 4.174
Shaobin Li,Jing Pan,Fengbo Li,Li Zhang,Dongfeng Chai,Zhuanfang Zhang,Jianjiao Xin
A simple continuous hydrothermal method was used to synthesize a NiFe2O4@Ni–Mn LDH/NF composite. The layered structure provides a large void to transfer the electron effectively, and the composite materials exhibit remarkable electrochemical performance including excellent specific capacitance (1265 F g−1 at 1 A g−1) and remarkable cycling stability (the specific capacitance remains at 80.9% after 5000 cycles). In addition, the asymmetric supercapacitor exhibits a high energy density of 96.2 W h kg−1 at a power density of 700 W kg−1, and there is an extraordinarily good cycling stability with a capacity retention rate of 92.5% after 4000 cycles. The outcomes indicate that the NiFe2O4@Ni–Mn LDH/NF composite electrode has potential application as a high-performance supercapacitor.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 5
·1-10
·
IF 5.833
Wang Xuemei,Ji Hong,Wang Fangbing,Cui Xinglan,Liu Yacong,Du Xinzhen,Lu Xiaoquan
A new kind of NiFe 2 O 4 -based magnetic covalent organic framework nanocomposites (NiFe 2 O 4 @COFs) was fabricated through facile synthesis approach under room temperature. The NiFe 2 O 4 @COFs exhibited higher adsorption capacity for brominated flame retardants than carbon nanotube material based on hydrophobic interactions, π-π stacking interaction, and van der Waals forces. In addition, the adsorption isotherm and the kinetic model were more suitable for Langmuir and pseudo-second-order model, respectively. NiFe 2 O 4 -based magnetic covalent organic framework nanocomposites combined with HPLC-UV (absorption wavelength: 214 nm) technology has excellent adsorption performance, which exhibited low detection limits (0.03–1.9 μg L −1 ), wide linear range (0.11–1000 μg L −1 ), good recoveries (91.5–102%) with a relative standard deviation of less than 2.9%. Finally, the prepared magnetic material was successfully used asadsorbents of magnetic solid-phase extraction and applied to the determination of five BFRs from the real water samples. Graphical abstract
The adsorption and removal of BFRs by NiFe 2 O 4 @COFs from water samples.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Yi Liu,Weiqi Sun,Zhicheng Yang,Ruoyang Zhang,Bin Li,Lixian Sun,Fen Xu,Wenwei Guo,Conglong Shi,Ting Yu,Zhengyi Liang,Qingjie He
Magnesium hydride (MgH 2 ), recognized as a promising alternative energy material to replace fossil fuels, possesses distinct advantages, including higher stability and hydrogen storage capacity. Nevertheless, its widespread application remains limits due to intrinsic drawbacks such as high thermodynamic stability and sluggish hydrogen adsorption-desorption kinetics. Coral-like NiO/NiFe 2 O 4 heterojunction catalysts were efficaciously synthesized through a conventional hydrothermal-calcination method in our work. These catalysts were subsequently ball-milled with MgH 2 to obtain the MgH 2 –NiO/NiFe 2 O 4 composite. A comprehensive series of hydrogen storage performance (HSP) evaluations demonstrated that the composite exhibits markedly enhanced hydrogen adsorption-desorption characteristics. Specifically, MgH 2 –NiO/NiFe 2 O 4 initiated hydrogen release at 188 °C, which represents a 133 °C decrease compared with ball-milled MgH 2 . At 275 °C, its composite released 6.2 wt% H 2 within 20 min, while at a hydrogen absorption temperature of 100 °C, it absorbed 4.4 wt% H 2 within 30 min. Besides, the composite dehydrogenation activation energy was declined to 86.97 kJ/mol, a decrease of 62.17 kJ/mol relative to ball-milled MgH 2 . Mechanistic investigations revealed that NiO/NiFe 2 O 4 underwent in situ transformation into Mg 2 Ni and FeO during hydrogen adsorption-desorption process. Simultaneously, the reversible “Mg 2 NiH 4 /Mg 2 Ni” phase functioned as hydrogen pump, thereby accelerating the kinetics. First-principles calculations further demonstrated that Fe atoms in the in situ-generated FeO acquired electrons from the MgH 2 interface, which weakened the Mg–H bonds and facilitated hydrogen desorption. This electronic modulation of MgH 2 effectively enhanced its hydrogen adsorption-desorption dynamics and substantially lowered hydrogen desorption activation energy. To sum up, our study reports successful preparation of a binary transition-metal heterojunction catalyst, NiO/NiFe 2 O 4 , derived from Ni and Fe. The outcomes offer new thoughts into design and classification of transition-metal-based catalysts for hydrogen storage applications.
研究领域:
材料科学
·
能源化学
·
纳米催化
·
氢储能
·
固态储氢
✓ 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）