JOURNAL OF APPLIED PHYSICS
·
2014
·Vol. 115
·期 17
·
IF 2.185
Li S. J.,Li D.,Jiang J. J.,Liu G. B.,Ma S.,Liu W.,Zhang Z. D.
Growth process and magnetic properties of PbO-type α-Fe x Se nanostructures with shape changing from nanocacti to nanopetals and then to nanosheets are investigated. With iron acetylacetonate [Fe(acac) 3 ] and Se powder as raw materials, the diffusion process of Fe atoms dominates the synthesis of α-Fe x Se nanocacti following phase transitions from FeSe 2 to Fe 3 Se 4 and finally to α-Fe x Se. When a mixed solution containing Se precursor and Fe(acac) 3 was used as the raw material, the formation of FeSe 2 and Fe 3 Se 4 can be avoided and, bended α-Fe x Se nanopetals can be prepared at 345 °C, which became flat nanosheets with a [001] preferred orientation as extending the reaction time from 1 to 4 h. No superconducting transition occurs in the α-Fe x Se (0.84 ≤ x ≤ 1.05) nanostructures due to composition heterogeneity or size effect. Magnetic measurements indicate that an antiferromagnetic component with a Néel point at about 45 K dominates the magnetic properties of the α-Fe 0.87 Se nanosheets.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yue Shi,Jiejie Bai,Aixin Ma,Zhitao Zou,Yanru Liu,Haifeng Lin,Dehong Chen,Ruiyong Zhang,Jianping Lai,Lei Wang
The superior electrocatalysts for seawater oxygen evolution reaction (OER) require fast kinetic to promote reactant (OH − ) transport and adsorption, and to optimize oxygenated intermediates (O* and OOH*) adsorption, but also high corrosion resistance by impeding Cl − adsorption under harsh seawater conditions, while the incomprehensive design greatly hinder the system advancement at high current densities. Herein, we propose orderly incorporating amorphous FeSe nanosheets as the dynamic anti-corrosion layer to reinforce charge redistribution of CoNi layered double hydroxide (LDH) nanosheets array and create favorable microenvironments. The ordered two-dimensional/three-dimensional structure prepared by novel non-equilibrium electrodeposition strategy allows amorphous FeSe component not only to activate CoNi-LDH for promoting OH − adsorption, optimizing oxygenated intermediates adsorption and increasing Cl − adsorption energy, but also repel Cl − by dynamic polyanion layer without blocking active sites, thus affording effective seawater OER with low overpotential, excellent stability and high selectivity at high current densities. The integrated CoNi-LDH/FeSe electrode delivers a small overpotential (338 mV at 500 mA cm −2 ) and possesses outstanding stability and selectivity during a 500-hour durability test at 500 mA cm −2 in alkaline seawater.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Long-Cheng Zhang,Min-Qiang Wang,Hao Chen,Heng Liu,Ying Wang,Long-Zhen Zhang,Guo-Rong Hou,Shu-Juan Bao
Large-scale electrochemical water splitting is hindered by the sluggish oxygen evolution reaction (OER) kinetics. In this work, we report a vertically standing Fe 3 O 4 -FeSe/CoSe 2 hierarchical structure material grown on carbon cloth as a highly active OER electrocatalyst . Benefiting from the rock-like Fe 3 O 4 particles on the carbon cloth, the CoSe 2 nano-arrays are more firmly affixed onto the carbon cloth. In addition, small amount of FeSe particles adsorbed on the CoSe 2 arrays offer a synergistic advantage, in which CoSe 2 achieved a small 279 mV overpotential at a current density of 10 mA cm −2 and a low Tafel slope of 68.78 mV dec −1 . By comparing the performance of Fe 3 O 4 -FeSe/CoSe 2 with pure CoSe 2 and Fe 3 O 4 -FeSe, it demonstrates to be the most efficient OER catalyst. Significantly, the hierarchical structural strategy of fixed Fe 3 O 4 growth on carbon cloth arrays introduces a new concept to explore the design of high efficiency OER electrocatalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SEMICONDUCTORS
·
2025
·Vol. 59
·期 2
·129-138
·
IF 0.6
Cao Shuai,Zou Mengyu,Sun Yanchen,Gao Congben,Fan G. W.
A β-FeSe superconductor was synthesized by use of the explosive compaction aided by post-thermal treatment. The temperature of the explosive compact was measured during the experiment to be 58.2 ± 0.5°C, and its intrinsic mechanism were analyzed through theoretical simulation. The superconducting properties of the sample were measured using a physical property measurement system. The results shown that the compact before heat treatment exhibited semiconducting characteristics, the compact after heat treatment at a maximum temperature of 500°C exhibited superconductivity at 8 K. The sample exhibited metallic behavior prior to reaching 8 K. An anomaly in resistance was observed in the vicinity of 90 K, which indicated a structural phase transition. The diamagnetic fraction volume reached 47% calculated based on ZFC data. It is evident that the explosive compaction methods can serve as a valuable adjunct to existing research methodologies for superconducting materials.
研究领域:
凝聚态物理
·
材料科学
·
超导材料
·
粉末冶金
·
热处理技术
✓ 已验证
DOI
高影响因子
ANALYST
·
2015
·Vol. 140
·期 19
·6684-6691
·
IF 4.107
Fengmin Qiao,Zhenzhen Wang,Ke Xu,Shiyun Ai
A facile process was developed for the synthesis of FeSe–Pt@SiO2 nanospheres based on the hydrothermal treatment of FeCl3·6H2O, selenium and NaBH4 in ethanolamine solvent, followed by reducing HPtCl4 with NaBH4 in the presence of FeSe particles to obtain FeSe coated with Pt NPs (FeSe–Pt), ending with a surfactant assembled sol–gel process to obtain FeSe–Pt@SiO2. The morphology and composition of FeSe–Pt@SiO2 were characterized by transmission electron microscopy, high resolution TEM, X-ray diffraction and Fourier transform infrared spectroscopy. Structural analyses revealed that FeSe–Pt@SiO2 nanospheres were of regular spherical shape with smooth surfaces due to the SiO2 shells, compared with FeSe particles with 150 nm lateral diameter. The prepared FeSe–Pt@SiO2 nanospheres possessed both intrinsic glucose oxidase (GOx-) and peroxidase-mimic activities, and we engineered an artificial enzymatic cascade system with high activity and stability based on this nanostructure. The good catalytic performance of the composites could be attributed to the synergy between the functions of FeSe particles and Pt NPs. Significantly, the FeSe–Pt@SiO2 nanospheres as robust nanoreactors can catalyze a self-organized cascade reaction, which includes oxidation of glucose by oxygen to yield gluconic acid and H2O2, and then oxidation of 3,3,5,5-tetramethylbenzidine (TMB) by H2O2 to produce a colour change. Colorimetric detection of H2O2 and glucose using the FeSe–Pt@SiO2 nanospheres was conducted with high detection sensitivities, 0.227 nM and 1.136 nM, respectively, demonstrating the feasibility of practical sensing applications. It is therefore believed that our findings in this study could open up the possibility of utilizing FeSe–Pt@SiO2 nanospheres as enzymatic mimics in diagnostic and biotechnology fields.
研究领域:
生物传感
·
纳米医学
·
酶学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Tao Liu,Lijun Xu,Xuejie Wang,Haoliang Lv,Bicheng Zhu,Jiaguo Yu,Liuyang Zhang
The natural abundance of sodium has fostered the development of sodium-ion batteries for large-scale energy storage. However, the low capacity of the anodes hinders their future application. Herein, carbon-encapsulated MnSe-FeSe nanorods (MnSe-FeSe@C) have been fabricated by the in-situ transformation from polydopamine-coated MnO(OH)-Fe 2 O 3 . The heterostructure constructed by MnSe and FeSe nanocrystals induces the formation of built-in electric fields, accelerating electron transfer and ion diffusion, thereby improving reaction kinetics. In addition, carbon enclosure can buffer the volumetric stress and enhance the electrical conductivity. These aspects cooperatively endow the anode with superior cycling stability and distinguished rate performance. Specifically, the discharge capacity of MnSe-FeSe@C reaches 414.3 mA h g −1 at 0.1 A g −1 and 388.8 mA h g −1 even at a high current density of 5.0 A g −1 . In addition, it still retains a high reversible capacity of 449.2 mA h g −1 after 700 long cycles at 1.0 A g −1 . Further, the ab initio calculation has been employed to authenticate the existence of the built-in electric field by Bader charge, indicating that 0.24 electrons in MnSe were transferred to FeSe. The in-situ XRD has been used to evaluate the phase transition during the charging/discharging process, revealing the sodium ion storage mechanism. The construction of heterostructure material paves a new way to design performance-enhanced anode materials for sodium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Liyuan Chang,Lingzhi Xia,Qianlei Jiang,Wei Zhao,Kailing Zhou,Changhao Wang,Bing Wang,Yuhong Jin,Ruzhi Wang
Developing zinc-air batteries still heavily relies on the design of stable, high-activity, and inexpensive oxygen-electric bifunctional catalysts. In this work, transition metal iron salts converted amorphous carbon into graphitized carbon at high temperatures, and nitrogen-doped graphitized carbon-anchored iron nanoparticles (Fe–N–C) are prepared. Then, Fe–N–C is pyrolyzed with selenium dioxide (SeO 2 ) to convert iron (Fe) nanoparticles into iron selenide (FeSe) in situ to obtain nitrogen-doped graphitized carbon-anchored FeSe nanoparticle catalysts (FeSe/NC). The catalyst's carbon support has excellent electrical conductivity, which effectively promotes the transport rate of charges and enhances the catalytic activity of FeSe particles. FeSe/NC demonstrates outstanding catalytic activity for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). When utilizing FeSe/NC catalysts in rechargeable zinc-air batteries (ZABs-FeSe/NC), the most excellent power density could exceed 186.6 mW cm −2 , and the specific capacity can achieve 905.2 mAh g −1 , demonstrating excellent performance. Furthermore, the battery can achieve stable charge-discharge for longer than 200 h at a large current density of 10 mA cm −2 , which has excellent practical application feasibility in the future.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Physical Review Materials
·
2018
·Vol. 2
·期 7
·074801
·
IF 0
M. Z. Shi,N. Z. Wang,B. Lei,C. Shang,F. B. Meng,L. K. Ma,F. X. Zhang,D. Z. Kuang,X. H. Chen
Finding a new derivative structure of FeSe-based superconductors with a high superconducting transition temperature (${T}_{c}$) is of great significance. Here, in this work, an organic-ion-[cetyltrimethyl ammonium (${\mathrm{CTA}}^{+}$)]-intercalated FeSe-based superconductor ${(\mathrm{CTA})}_{0.3}\mathrm{FeSe}$ with ${T}_{c}$ as high as 45 K is synthesized by an electrochemical intercalation method. The as-prepared ${(\mathrm{CTA})}_{0.3}\mathrm{FeSe}$ has a hybrid crystal structure consisting of double layers of ${\mathrm{CTA}}^{+}$ and one layer of FeSe, which is consistent with a lateral-bilayer model. The superconductivity of ${(\mathrm{CTA})}_{0.3}\mathrm{FeSe}$ is confirmed by magnetic susceptibility. Furthermore, a negative pressure effect on superconductivity $d{T}_{c}/dP=\ensuremath{-}5$ K/GPa is observed. This is the first pure organic-ion-intercalated FeSe-based superconductor with a high ${T}_{c}$ and high crystallinity. Our work offers a new method to modify the interface interaction between the FeSe layer and the intercalator, and sheds new light on finding new FeSe-based superconductors with higher ${T}_{c}$.
✓ 已验证
DOI
Royal Society Open Science
·
2019
·Vol. 6
·期 3
·
IF 2.515
Shijie Shen,Wenwu Zhong,Zongpeng Wang,Zhiping Lin,Shangshen Feng
A series of β-FeSe nanorods composited g-C3N4 were prepared. The structure, morphology, chemical state, photocatalytic activity, electrochemical impedance and photoluminescence of β-FeSe/g-C3N4 composites were well characterized. It is found that the decolourization rate of 3 wt% β-FeSe/g-C3N4 composites reaches 4.4 times than that of g-C3N4. The improved photocatalytic properties could be ascribed to the reduced recombination of photogenerated electrons and holes, which is derived from the excellent ability of β-FeSe to capture and transfer electrons. This work provides an alternative co-catalyst for decolourizing organic matter.
研究领域:
材料科学
·
光催化
·
纳米材料
·
环境化学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2016
·Vol. 7
·期 1
·1-8
·
IF 11.329
Du Zengyi,Yang Xiong,Lin Hai,Fang Delong,Du Guan,Xing Jie,Yang Huan,Zhu Xiyu,Wen Hai-Hu
In the field of iron-based superconductors, one of the frontier studies is about the pairing mechanism. The recently discovered (Li 1− x Fe x )OHFeSe superconductor with the transition temperature of about 40 K provides a good platform to check the origin of double superconducting gaps and high transition temperature in the monolayer FeSe thin film. Here we report a scanning tunnelling spectroscopy study on the (Li 1− x Fe x )OHFeSe single crystals. The tunnelling spectrum mimics that of the monolayer FeSe thin film and shows double gaps at about 14.3 and 8.6 meV. Further analysis based on the quasiparticle interference allows us to rule out the d -wave gap, and for the first time assign the larger (smaller) gap to the outer (inner) Fermi pockets (after folding) associating with the d xy ( d xz /d yz ) orbitals, respectively. The gap ratio amounts to 8.7, which demonstrates the strong coupling mechanism in the present superconducting system.
研究领域:
凝聚态物理
·
超导研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCRIPTA MATERIALIA
·
2019
·
IF 4.539
Qingshuang Ma,Feng Lan,Xinhua Li,Zunfeng Du,Huijun Li,Zongqing Ma
In this work, the superconducting properties of FeSe 1−x S x with 0 ≤ x ≤ 0.5 were studied. With S doping, T c is enhanced and shows a dome shape in the studied composition range. XRD measurements demonstrate that S substituting Se sites introduces positive chemical pressure, which can suppress the orbital ordering, manifesting as the decrease of T s . Hall measurements demonstrate that S doping can effectively tune the charge carriers and make hole-type carriers predominant. However, no maxing T c is obtained as T s vanishes in FeSe 0.7 S 0.3 , indicating the nematic order has no universal influence on the superconductivity of FeSe system.
研究领域:
凝聚态物理
·
材料科学
·
低温物理学
·
强关联电子系统
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Ning Wei,Lipeng Zhang,Kexin Li,Yanyan Xu,Fan Zhao,Yaqiu Sun
Developing cost-effective, efficient, and durable oxygen evolution reaction (OER) electrocatalysts is essential for advancing water splitting to produce clean hydrogen, enabling sustainable energy conversion while reducing reliance on noble metals. Herein, we present a feasible approach for synthesizing a trimetallic selenide catalyst Ni 3 Se 2 @CoSe 2 @FeSe (Ni–CoFe–Se) with ultra-thin nanosheets morphology via the facile selenization of NiCoFe Prussian blue analogues (PBAs) to enhance the OER performance. By leveraging the synergistic interactions within the trimetallic selenide heterostructures and the rationally engineering rich heterointerfaces and defect, the electronic structure of Ni–CoFe–Se was optimized and high-density active sites were generated. The optimal Ni–CoFe–Se catalyst demonstrates excellent OER performance, achieving a low overpotential of 176 mV at 10 mA cm −2 in alkaline conditions, and exhibiting a low Tafel slope of 59 mV·dec −1 . The developed catalyst also possesses excellent stability and long-term durability in electrocatalytic applications. This work offers an effective strategy for designing non-noble metal catalysts through the collaborative integration of chemical composition tuning and structural engineering.
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产品关联
DOI
高影响因子
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