INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Yaokun Fu,Yu Wang,Lu Zhang,Yuan Li,Shumin Han
MgH 2 is one of the ideal hydrogen storage materials because of its high hydrogen storage density, but the thermodynamic stability and slow kinetics of Mg/MgH 2 system hinder its practical application. Transition metal catalyst doping has become an important strategy to improve the hydrogen storage kinetics of MgH 2 . In this work, FeNi 3 @CS was prepared by solvothermal method with carbon spheres (CS) as the support, and introduced into Mg/MgH 2 system to prepare MgH 2 –FeNi 3 @CS composite. The initial dehydrogenation temperature of MgH 2 –FeNi 3 @CS composite is 565 K, which is 100 K lower than additive-free MgH 2 . At 423 K, MgH 2 –FeNi 3 @CS composite could absorb 4.5 wt% H 2 , while the hydrogen absorption capacity of MgH 2 without additives is only 2.0 wt%. After 10 cycles, the hydrogenation and dehydrogenation capacity could be maintained at 5.6 wt% and 4.5 wt%, respectively. In addition, the activation energy of MgH 2 –FeNi 3 @CS composite decreased by 52 kJ/mol compared with MgH 2 . FeNi 3 was in situ converted to Mg 2 NiH 4 and Fe after hydrogenation-ball milling, which were considered as the catalytic active substances in Mg/MgH 2 system. The synergistic catalysis of Mg 2 Ni/Mg 2 NiH 4 , Fe and carbon materials has a positive effect on improving the hydrogen storage performance of Mg/MgH 2 system.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 4
·598
·
IF 4.324
Congai Han,Haiyan Zhang,Danfeng Zhang,Yunfei Deng,Junyao Shen,Guoxun Zeng
The reasonable design of magnetic carbon-based composites is of great significance to improving the microwave absorption (MA) performance of the absorber. In this work, ultrafine FeNi3nanocrystals (5–7 nm) embedded in a 3D honeycomb-like carbon matrix (FeNi3@C) were synthesized via a facile strategy that included a drying and carbonization process. Because of the soft magnetic property of the FeNi3nanocrystals and their unique 3D honeycomb-like structure, the FeNi3@C composites exhibit excellent MA abilities. When the filler loading ratio of FeNi3@C/paraffin composites is only 30 wt%, the maximum reflection loss (RL) value is −40.6 dB at 10.04 GHz. Meanwhile, an ultra-wide absorption frequency bandwidth of 13.0 GHz (5.0–18.0 GHz over −10 dB) can be obtained in the thickness range of 2.0–4.5 mm, and this means that the absorber can consume 90% of the incident waves. It benefits from the dual loss components, multiple polarizations, and multiple reflections for improving MA performances of FeNi3@C composites. These observations suggest that the 3D honeycomb-like FeNi3@C composites have broad application prospects in exploring new MA materials that have a wide frequency bandwidth and strong absorption.Keywords:FeNi3@C composites;3D honeycomb-like carbon;microwave absorption
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Yamei Wang,Guangfu Qian,Qinglian Xu,Hao Zhang,Fang Shen,Lin Luo,Shibin Yin
Preparing efficient and stable catalysts is one of the most urgent problems for water splitting. Herein, IrNi-FeNi 3 hybrid self-supported on nickel foam with unique nanosheets and 1.218 wt.% Ir-loading is synthesized via hydrothermal method. In 1.0 M KOH, ultralow overpotentials for oxygen evolution reaction (OER, η 20 = 240.0 mV, η 1000 = 330.0 mV) and hydrogen evolution reaction (HER, η 10 = 31.1 mV, η 1000 = 288.8 mV) are needed. Only 1.47 V is required for overall water splitting to arrive at 10 mA cm −2 , indicating superior activity. For overall water splitting, it also demonstrates good stability with negligible declines after testing for 100 h at 500 mA cm −2 in 6.0 M KOH at 60 ℃, which is close to the practical application. The unique self-supported nanosheets structure on nickel foam can expose more active sites and the hybridization of IrNi with FeNi 3 can promote the intrinsic activity of catalyst. Therefore, this work proposes an industrially promising catalyst for water splitting.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yang Yu,Xinlu Liu,Fei Huang,Qingyu Huang,Chuang Yang,Yongjun Zhang
3D-printed monolithic catalysts have garnered significant attention in wastewater treatment due to their structural flexibility and mass transfer control. However, catalyst stability remains a critical challenge for peroxymonosulfate (PMS) activation processes. In this study, a random forest model was employed to investigate the stability and optimize the selection of bimetallic (Fe and Ni) active components. FeNi 3 alloy was synthesized on 3D-printed monoliths by electrodeposition, achieving excellent stability. The 3DE-FeNi monolithic catalyst exhibited excellent performance, achieving a 98.6% conversion of OFX by PMS activation. Numerical simulations and experimental characterizations were used to explore the mass transfer mechanisms. This study provides an effective strategy for precisely manufacturing structured catalysts with high catalytic stability, which can be applied to a range of chemical reactions.
研究领域:
环境科学
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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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Shichao Gao,Hui Wang,Xinhua Wang,Haizhen Liu,Ting He,Yuanyuan Wang,Chen Wu,Shouquan Li,Mi Yan
The FeNi 3 , MoSe 2 and MoSe 2 @FeNi 3 hollow nano-spheres synthesized by wet chemical method are used for the first time to improve the hydrogen storage properties of the MgH 2 . The results show that they all possess excellent catalytic activity in the hydrogen desorption/sorption reactions of MgH 2 . Because of the synergistic catalytic effect of MoSe 2 and FeNi 3 , the MoSe 2 @FeNi 3 has the most outstanding catalytic effect. In detail, the onset dehydrogenation temperature of MgH 2 is reduced from 310 °C to 194 °C, and its maximum dehydrogenation rate is increased by 19.8 times by the introduction of 10 wt% MoSe 2 @FeNi 3 . Furthermore, the 10 wt% MoSe 2 @FeNi 3 -doped MgH 2 sample, 5.8 wt% H 2 can be absorbed in 0.5 min at 150 °C. However, the un-doped MgH 2 sample hardly absorbs hydrogen under the same conditions. The onset hydrogen absorption temperature of the composite is only 73 °C. More importantly, it has an excellent cycling stability. These improvements are because the in situ formed MgSe, Mo, Mg 2 Ni and Fe can serve as active species, and they as well as their homogeneous distribution on MgH 2 matrix can remain stable during dehydrogenation/hydrogenation. In addition, the presence of Mg 2 Ni can convert MgH 2 to an easier pathway of hydrogen absorption/desorption. These help to facilitate the hydrogen storage performance of MgH 2 .
研究领域:
材料科学
·
能源储存
✓ 已验证
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2024
·
IF 9.4
Linxin Zheng,Shuai Li,Liuting Zhang,Tao Zhong,Xiuzhen Wang,Ting Bian,Petr Senin,Ying Wu
Magnesium hydride (MgH 2 ) demonstrates immense potential as a solid-state hydrogen storage material, while its commercial utilization is impeded by the elevated operating temperature and sluggish reaction kinetics. Herein, a MOF derived multi-phase FeNi 3 -S catalyst was specially designed for efficient hydrogen storage in MgH 2 . Experiments confirmed that the incorporation of FeNi 3 -S into MgH 2 significantly lowered the desorption temperature and accelerated the kinetics of hydrogen desorption and reabsorption. The initial dehydrogenation temperature of the MgH 2 + 10 wt% FeNi 3 -S composite was 202°C, which was 123°C lower than that of pure MgH 2 . At 325°C, the MgH 2 + 10 wt% FeNi 3 -S composite released 6.57 wt% H 2 (fully dehydrogenated) within 1000 s. Remarkably, MgH 2 + 10 wt% FeNi 3 -S composite initiated rehydrogenation at room temperature and rapidly absorbed 2.49 wt% H 2 within 30 min at 100°C. Moreover, 6.3 wt% H 2 was still retained after 20 cycles at 300°C, demonstrating the superior cycling performance of the MgH 2 + 10 wt% FeNi 3 -S composite. The activation energy fitting calculations further evidenced the addition of FeNi 3 -S enhanced the de/resorption kinetics of MgH 2 ( E a = 98.6 kJ/mol and 43.3 kJ/mol respectively). Through phase and microstructural analysis, it was determined that the exceptional hydrogen storage performance of the composite was attributed to the in-situ formation of Mg/Mg 2 Ni + Fe/MgS and MgH 2 /Mg 2 NiH 4 + Fe/MgS hydrogen storage systems. Further mechanistic analysis revealed that Mg 2 Ni/Mg 2 NiH 4 served as “hydrogen pump” and Fe/MgS served as “hydrogen diffusion channel”, thus accelerating the dissociation and recombination of hydrogen molecules. In conclusion, this work offers insight into catalysts combining transition metal alloys and transition metal sulfide for exerting muti-phase synergistic effect on boosting the dehydrogenation/hydrogenation reactions of MgH 2 , which can also inspire future pioneering work on designing and fabricating high efficient catalysts in other energy storage related areas.
研究领域:
材料科学
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能源存储
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Daoming Chen,Han Xu,Lifeng Li,Tao Ruan,Xinping Ouyang,Xueqing Qiu
The hydrodemethoxylation (HDMO) of lignin-derived monophenolics to alkylphenols is a crucial step for the conversion of lignin bio-oil into chemicals. A new FeNi 3 alloy catalyst was firstly prepared by being reduced in-suit from Fe, Ni oxides precursor. The FeNi 3 /FeNi 8 O 9.25 catalyst prepared using optimal 12:88 of molar ratio of iron nitrate to nickel nitrate showed good catalytic activity and selectivity to HDMO of lignin-derived monophenolics. In the HDMO process of lignin-derived 4-propylguaiacol, FeNi 3 /FeNi 8 O 9.25 contributed to a 94.53 % of conversion and a 90.67 % of demethoxylation selectivity under 0.4 MPa H 2 at 280 °C for 2 h. Compared with the Ni/Ni 1 O catalyst, the FeNi 3 /FeNi 8 O 9.25 catalyst increased by 6.19 times and 2.35 times of the specific surface area and total acid amount, respectively. FeNi 3 (111) possessed lower adsorption energy to substrate and changed adsorption configuration of the benzene ring in tilted mode. Consequently, prepared catalyst facilitated the removal of methoxy group, as well as suppressing hydrogenation saturation of the benzene ring. Moreover, FeNi 3 /FeNi 8 O 9.25 catalyst exhibited versatile capacity of HDMO to different lignin-derived monophenolics and high stability. This work offers a new strategy for constructing non-noble metallic alloy catalyst for highly selective HDMO reactions.
研究领域:
催化化学
·
生物质转化
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绿色化学
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能源化工
·
有机反应工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2024
·Vol. 135
·期 6
·
IF 2.7
Yu Qi,Tang Yiming,Nie Weicheng,Du Chenglong,Wang Yunlong
The graphene-based electromagnetic wave absorption materials have attracted extensive attention due to their lightweight, strong absorption, broadband, and thin thickness. In this work, graphene hollow microspheres anchored with FeNi-coupled nanocrystal (GHMs@FeNi 3 /NiFe 2 O 4 ) were synthesized using water-in-oil (W/O) emulsification and high-temperature calcination. The GHMs@FeNi 3 /NiFe 2 O 4 microspheres have a homogeneous spherical morphology and a pronounced hollow structure, and the FeNi-coupled nanocrystals are homogeneously embedded in a spongy shell assembled by rGO nanosheets. Owing to the optimized impedance matching and enhanced attenuation, the GHMs@FeNi 3 /NiFe 2 O 4 composites exhibit outstanding microwave absorption ability, particularly in the Ku band. The minimum reflection loss (RL min ) value can reach −58.96 dB at 14.43 GHz with a matching thickness of 2.25 mm, and the effective absorption bandwidth (lower than −10 dB) is up to 6.29 GHz (11.71–18 GHz) covering the whole Ku band. We believe that our work provides an idea for the design of high-performance absorbing composite materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Beili Pang,Meili Zhang,Cheng Zhou,Hongzhou Dong,Shuai Ma,Jianguang Feng,Yingjie Chen,Liyan Yu,Lifeng Dong
The development of low cost electrocatalysts with excellent I − /I 3 − redox reaction efficiency is critically important for practical applications of dye-sensitized solar cells (DSSCs). Nevertheless, it is difficult to simultaneously improve the activity and stability of catalysts. Herein, heterogeneous FeNi 3 /NiFe 2 O 4 nanoparticles are successfully embedded in modified graphene (mGr) matrix with network structure. As-prepared FeNi 3 /NiFe 2 O 4 @mGr shows excellent electrocatalytic activities and high stability. The DSSCs with FeNi 3 /NiFe 2 O 4 @mGr as counter electrodes demonstrate a high power conversion efficiency of 12.14%, which is superior to that of platinum (Pt, 8.31%). Also, the FeNi 3 /NiFe 2 O 4 @mGr device remains 90% efficiency up to 42 days under ambient conditions without encapsulation. Therefore, the FeNi 3 /NiFe 2 O 4 @mGr composite can be further developed as an environmentally friendly, inexpensive, and efficient counter electrode material for DSSCs.
研究领域:
材料科学
·
能源科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Xiao Ding,Ying Huang,Suping Li,Na Zhang,Jianguo Wang
High-performance electromagnetic wave absorption materials with strong absorption intensity, broad bandwidth, low density and thin thickness can be widely applied in the civil and military areas. In this paper, FeNi 3 nanoalloy decorated on 3D architecture composite of reduced graphene oxide/molybdenum disulfide (FeNi 3 @RGO/MoS 2 ) was prepared by two-step of hydrothermal reaction . RGO/MoS 2 composite was synthesized by a hydrothermal process and then FeNi 3 nanoalloy was decorated on the RGO/MoS 2 nanosheets via the second hydrothermal process. Electromagnetic wave absorption performances of FeNi 3 @RGO/MoS 2 composite with different filler loadings in paraffin matrix were investigated for the first time and it improves significantly with the increase of filler loading. The maximum absorption bandwidth is 4.72 GHz with the thickness of 2.0 mm and the corresponding reflection loss value is −30.39 dB when the filler loading of FeNi 3 @RGO/MoS 2 is 40%. The ternary composite possesses dielectric loss and magnetic loss in the testing frequency region, magnetic loss plays an important role in low-frequency region and dielectric loss occupies the main part in the high-frequency area.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 19
·11967-11975
·
IF 10.733
Houfu Lv,Le Lin,Xiaomin Zhang,Dunfeng Gao,Yuefeng Song,Yingjie Zhou,Qingxue Liu,Guoxiong Wang,Xinhe Bao
Solid oxide electrolysis cells (SOECs) have attracted increasing attention as a promising device for the electrochemical CO2 reduction reaction (CO2RR) due to their high efficiency and fast kinetics. Exploring active cathode catalysts for the CO2RR is highly desirable for the research and development of SOECs. Herein, in situ exsolved FeNi3 nanoparticles on a Sr2Fe1.35Mo0.45Ni0.2O6−δ (SFMN) double perovskite substrate (FeNi3@SFMN) is developed to efficiently catalyze the CO2RR in SOECs. The SOEC with the FeNi3@SFMN–GDC (Gd0.2Ce0.8O1.9) cathode shows a current density of 0.934 A cm−2 at 1.6 V and 800 °C, as well as high stability and no coke deposition for 40 h at 1.2 V. CO2-temperature programmed desorption and quasi in situ Fourier-transform infrared spectroscopy measurements verify the intensive adsorption of CO2 on the FeNi3@SFMN–GDC cathode. Distribution of relaxation time analysis combined with density functional theory calculations discloses the stimulative activation of CO2 at the interface between the exsolved FeNi3 nanoparticles and the SFMN substrate with abundant oxygen vacancies, which improves the CO2RR performance at the FeNi3@SFMN–GDC cathode.
研究领域:
材料科学
·
能源化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2023
·Vol. 7
·期 20
·4952-4960
·
IF 7
Tong Hou,Junyang Ding,Hao Zhang,Shanshan Chen,Qian Liu,Jun Luo,Xijun Liu
Due to the environmental pollution and high energy consumption associated with the conventional industrial Bosch–Meiser method, electrocatalytic urea synthesis emerges as a promising and sustainable alternative route. In this work, we constructed and utilized nitrogen-doped porous carbon loaded with bimetallic FeNi3 alloy nanoparticles as an efficient electrocatalyst for synthesizing urea from carbon dioxide (CO2) and nitrate (NO3−). The created FeNi3 alloy within FeNi/NC served as the active site for the C–N coupling reaction, generating a higher urea yield of 496.5 μg h−1 mgcat.−1 with a correlating faradaic efficiency (FE) of 16.58% at −0.9 V versus the reversible hydrogen electrode (vs. RHE), when in comparison to monometallic Fe/NC and Ni/NC catalysts. Moreover, we also monitored the urea generation process via in situ Raman spectroscopy technology, which enabled the identification of two critical reaction species, namely O–C–O and N–C–N, inferring that C–N coupling acted as the key reaction step.
研究领域:
电化学
·
材料科学
·
环境科学
·
可持续化学
✓ 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）