NANOTECHNOLOGY
·
2016
·Vol. 27
·期 16
·165702
·
IF 3.573
Chengrong Wei,Yongxiao Bai,Aiying Deng,Yan Bao
Iron diselenium (FeSe2) is a promising semiconductor for thin-film solar cells because it has a suitable band gap (Eg = 1.0 eV) and high absorption coefficient. Despite these prospects, the controllable synthesis of FeSe2 nanostructures and the diversity of their geometries has hardly been studied previously. Here, we described a successful synthesis of phase-pure, high-quality, and stable orthorhombic FeSe2 nanocrystals (NCs) in aqueous solvents. A variety of morphologies of the FeSe2 NCs were achieved by adjusting synthetic methods. FeSe2 nanoparticles with diameters of 30–100 nm were synthesized in the presence of ethylenediamine (en). Moreover, the synthetic approach developed for nanoparticles proved to be quite universal and could be modified to produce nanowires and octahedrons, with which structure the material could display high crystallinity. The diameter of the FeSe2 nanowires was 300–500 nm with a length exceeding 2 μm. The octahedrons displayed lateral dimensions of 1 μm. Meanwhile, the probable growth mechanism and fabrication process of the NCs were proposed. Polycrystalline FeSe2 thin films were fabricated by modifying the sedimentation method. The obvious photoconductivity of FeSe2 has already been observed, and it was considered to be one candidate of solar cell for the very first time.
研究领域:
材料科学
·
纳米技术
·
半导体物理
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Shijia Dong,Qingmei Su,Weicheng Jiao,Shukai Ding,Miao Zhang,Gaohui Du,Bingshe Xu
Transition-metal selenides have attracted extensive concern as one of the alternatives for sodium-ion batteries (SIBs) anodes due to their high theoretical capacities, good cycling stability and environmental benignity. However, the application of metal selenides is restricted by severe volume variation and sluggish kinetics during cyclings, which cause capacity fading induced by the pulverization and aggregation of the electrode materials. Herein, the FeSe 2 @C microspheres assembled with FeSe 2 nanoparticles cotaed by carbon layers are fabricated using a hydrothermal method and the subsequent annealing treatment. When served as anodes for SIBs, the FeSe 2 @C electrodes exhibit excellent electrochemical performances. A high reversible capacity of 461 mA h g −1 is retained after 100 cycles at 50 mA g −1 . Even at high rate of 1000 mA g −1 , a long-term cycling capacity of 428 mA h g −1 is achieved after 1000 cycles. The kinetic analyses confirm that the superior sodium storage performances of FeSe 2 @C composites are mainly attributed to the pseudocapacitive contribution facilitated by the unique nano-micro hierarchical structure.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2015
·
IF 10.325
Shoushuang Huang,Qingquan He,Wenlong Chen,Jiantao Zai,Qiquan Qiao,Xuefeng Qian
Mastery over the structures at nano/microscale can effectively tailor the catalytic activity and durability of materials. Herein, three dimension (3D) hierarchical iron diselenide (FeSe 2 ) microspheres have been successfully synthesized via a hot-injection method. The morphologies of building blocks and final products can be simply controlled by the amount and/or the type of alkythiols, from irregular micro/nanoparticles to uniform 3D hierarchical microspheres made of ultrathin nanosheets or rhombus-like nanorods . A formation mechanism has been understood based on the inherent crystal structure of FeSe 2 and the selective adsorption of alkythiols. The as-obtained FeSe 2 samples were employed as counter electrode (CE) materials in dye-sensitized solar cells (DSSCs). Electrochemical characterizations indicated that the 3D hierarchical FeSe 2 microspheres composed of ultrathin nanosheets (FeSe 2 NSs) exhibited low charge transfer resistance at the electrolyte–electrode interface, high electrocatalytic activity and fast reaction kinetics for the I − /I 3 − redox reaction . A DSSC with FeSe 2 NSs CE achieved a high power conversion efficiency of 8.39% under a simulated solar illumination of 100 mW cm −2 (AM 1.5), comparable to that of Pt based devices (8.20%). Moreover, the fast activity onset and relatively long stability demonstrated that the FeSe 2 NSs is a promising alternative to Pt in DSSC.
研究领域:
材料科学
·
能源科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2021
·
IF 2.993
Desheng Pan,Qifeng Kuang,Peng Tong,Wei Tong,Liubing Fan,Jing Zhao,Da Li,Chuljin Choi,Zhidong Zhang
Challenges still remain in producing room-temperature ferromagnetism/ferrimagnetism in inorganic–organic hybrid compounds. Here, we report the Fe vacancy-doped inorganic–organic (Fe x Se 2 ) 2 Fe(dien) 2 (dien = diethylenetriamine, x = 0.86) hybrid cuboids by self-assemble of finite one-dimensional (1D) FeSe 2 chains and Fe(dien) 2 complexes. A growth model is proposed by kinetically controllable syntheses of novel Fe 2x+1 Se 4 (dien) 2 hybrids. The Rietveld refinement reveals that Fe vacancies in the Fe 2.71 Se 4 (dien) 2 hybrid cuboids induce large distortions of the FeSe 2 chains and the room-temperature lattice parameters are a = 9.225(4) Å, b = 18.021(8) Å and c = 11.609(6) Å. Magnetic measurements and electron spin resonance spectra of the Fe 2.71 Se 4 (dien) 2 hybrid cuboids show the ferrimagnetism with the Curie temperature (T C ) of 600 K and the spin glass state with the freezing temperature (T f ) of 108 K. Impressive room-temperature ferrimagnetic properties of the Fe 2.71 Se 4 (dien) 2 hybrid cuboids were ascribed to the high concentration of Fe 3+ vacancies (0.29 per cell) in the hybrid cuboids, which is supported by the 57 Fe Mössbauer spectrum fitting based on the ferrimagnetic model.
研究领域:
材料科学
·
磁学
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Materials and Technologies
·
2021
·
IF 7.053
Zhifan Zhao,Xiaojing Teng,Qinqin Xiong,Hongzhong Chi,Yongjun Yuan,Haiying Qin,Zhenguo Ji
FeSe 2 @reduced graphene oxide (rGO) composite was prepared by a facile one-step hydrothermal technique with FeSe 2 nanoparticles uniformly achored on rGO nanosheets . The nano-sized FeSe 2 particles effectively reduce the transfer length of Li ion and increase the sufficient contact area between the electrolyte and active material. Moreover, rGO can not only improve the electrical conductivity , but also prevent the agglomeration of nano-sized FeSe 2 , as well as accommodate the volume expansion and strain generated from the charge/discharge process. As an anode material applied in Li-ion storage, FeSe 2 /rGO composite delivers superior specific capacity of 1167.6 mAh/g, good cycling stability (908.2 mAh g −1 after 120 cycles at the current density of 500 mA g −1 ) and high-power characteristics (728.0 mAh g −1 at 1000 mA g −1 ), due to coexistent Li-ion storage mechanisms of surface capacitive behavior and diffusion-controlled process.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Jinwei Wang,Yiquan Xiang,Weiyi Zhang,Yijie Zhang,Qiang Zhao,Jinping Li,Guang Liu
Developing a non-noble metal-based oxygen evolution electrocatalyst that works under high current densities is a challenging task in hydrogen production by water splitting. Herein, an efficient OER electrocatalyst was formed by combining Cr-doped FeOOH with high OER activity and FeSe 2 with high conductivity. Through the addition of FeSe 2 and the incorporation of Cr ion, the conductivity and intrinsic activity of the obtained Cr-FeOOH/FeSe 2 /NF towards OER are dramatically enhanced. To specific, the required overpotential is only 242 mV to realize the current density of 100 mA/cm 2 . In addition, the Cr-FeOOH/FeSe 2 /NF can output large current densities at industrial level, which only needs the overpotential of 293 and 336 mV to deliver the current density of 500 and 1000 mA/cm 2 , respectively. In addition, the overpotential is as low as 291 mV to attain 1000 mA/cm 2 in 30 wt% KOH solution. More importantly, the obtained Cr-FeOOH/FeSe 2 /NF electrode can stable work for 80 h at such a high current density of industrial level, and the overpotential does not increase significantly. This result suggests that the obtained electrocatalyst has latent capacity for industrial application. This work points out the direction for building high-performance oxygen evolution electrocatalysts at large current densities.
研究领域:
材料科学
·
电化学
·
能源转换与储存
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Wenyue Jiang,Bingxin Zhao,Ziting Li,Peng Zhou,Xiaoshuang Chen,Jinping Wang,Rui Yang,Chunling Zuo
Research into cost-effective electrocatalysts for alkaline water and simulated seawater oxidation is paramount for advancing the conversion and storage of renewable energy. In this study, a FeSe 2 /Ni 0·85 Se catalyst with the hollow and ultrathin nanobelts structure is synthesized. The distinctive structure characteristics of FeSe 2 /Ni 0·85 Se heterojunction nanobelts confer exceptional oxygen evolution reaction (OER) properties in diverse electrolytes, including alkaline 1 M KOH and simulated seawater (1 M KOH + 0.5 M NaCl) solutions. The FeSe 2 /Ni 0·85 Se catalyst presents the low overpotentials of 259 and 267 mV at a current density of 10 mA cm −2 , along with the Tafel slopes of 33.7 and 65.5 mV dec −1 in two solutions, respectively. Additionally, the FeSe 2 /Ni 0·85 Se catalyst also demonstrates good stability. This exploration introduces a promising strategy for the development of high-performance electrocatalysts in the realm of green energy, marking the significant progress towards sustainable energy solutions.
研究领域:
材料科学
·
电催化
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhi-Qiang Wang,Biao Zeng,Dan Zhou,Lu Tai,Xiao-Dong Liu,Woon-Ming Lau
Sodium ion battery (SIB) is considered as one of the most promising alternatives to Lithium ion battery (LIB) for large-scale energy storage, but wide usages of SIB are hindered by the lack of suitable anode materials with long cycling lifespan and high-rate capacity. With the merits of high theoretical specific capacity, preferable environmental benignity and wide resources availability, FeSe 2 -based materials have recently emerged as an attractive choice of SIB anode materials. In this work, a novel rich-oxygen-doped FeSe 2 nanosheets (O-FeSe 2 NSs) was constructed as a high-performance anode material for SIB. Substantially, the rich O on O-FeSe 2 NSs effectively promotes the active material and its intermediate reaction products to form an amorphous phase during cycling and hence alleviates the electrode’s volume expansion which usually causes poor cycling stability. Besides, the rich O atoms enables the formation of stable Solid electrolyte interface (SEI) as well as fast diffusion rate of Na + , and therefore enhances the cycling life of the electrode. In addition, the unique sheet structure with rich O atoms endows O-FeSe 2 NSs with super-high pseudocapacitance capacity which facilitates high-rate capabilities. Consequently, the O-FeSe 2 NSs electrode displays prolonged cycling life and high-rate capacity with a large specific capacity of 268.4/268.6 mAh g −1 which is kept even after 700 cycles under the current density of 1.0 A g −1 . Combined with detailed survey of electrochemical storage mechanism and Na + diffusion kinetics, the present work is expected to provide a new research idea of FeSe 2 -based anode materials and motivates a deep understanding of the Na-storage in the O-FeSe 2 NSs host for rechargeable SIB.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2021
·Vol. 33
·期 17
·2008456
·
IF 30.849
Hongtao Liu,Yunzhou Xue
Layered iron chalcogenides (FeX, X = S, Se, Te) provide excellent platforms to study intertwined phase transitions, superconductivity, and magnetism. However, layered iron dichalcogenides (FeX 2 , X = S, Se, Te) are rarely reported and their intrinsic properties are still unknown. Here, phase-pure layered iron diselenide (FeSe 2 ) nanocrystals are epitaxially grown on mica by the sublimed-salt-assisted chemical vapor deposition method at atmospheric pressure. The layered atomic structure of FeSe 2 is confirmed by X-ray diffraction and atomic-resolution scanning transmission electron microscopy. Electrical transport shows that the layered FeSe 2 is a metal with high conductivity and a phase transition at ≈11 K. The phase transition manifests itself as a kink in the temperature-dependent resistivity, as well as anomalous magnetoresistance (MR) appearing around the phase-transition temperature. The MR changes from negative to positive, accompanied by large hysteresis near the phase-transition temperature upon cooling. The negative MR and hysteresis might originate from magnetic field suppression scattering of spin fluctuations and competition of magnetic interactions induced by the phase transition, respectively. Layered iron dichalcogenide will be potential candidate to explore novel quantum phenomena and other applications.
研究领域:
凝聚态物理
·
材料科学
·
纳米科技
·
固体化学
·
低维材料
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 7
·期 9
·4469-4479
·
IF 9.931
Yongchao Tang,Zongbin Zhao,Xiaojuan Hao,Yue Wei,Han Zhang,Yanfeng Dong,Yuwei Wang,Xin Pan,Yanan Hou,Xuzhen Wang,Jieshan Qiu
Sodium-ion batteries (SIBs) with high energy/power density have been in urgent demand for various power applications. Upgrading the electrochemical dynamics of electrode materials is crucial to achieve this goal. Herein, we exhibit delicately synthesized cellular carbon-wrapped FeSe2 nanocavities (h-FeSe2@PC) with sub-5 nm ultrathin walls and multiple rooms for ultrafast sodium storage. Unlike with the conventional interphase Kirkendall effect, the multi-room FeSe2 nanocavities were formed via an exotic stress-induced cracking–hollowing reassembly mechanism. Benefiting from their unique multi-hierarchy, more than 93% pseudocapacitive capacity contribution was recognized in an h-FeSe2@PC anode, featuring ultrafast dynamics. As a result, h-FeSe2@PC displayed an extremely low-decay (9.5%) rate capability, ultrastable cyclability (over 2000 loops with 98.5% capacity retention), and high energy/power densities (670.7 W h kg−1/35.3 kW kg−1 at 20 A g−1). The results of multiple analyses and comparisons showed that the dynamics-promoted superior performance was correlated almost completely to the applied FeSe2 in h-FeSe2@PC by shortening the Na+-diffusion length to near the accessible limit (<10 nm) and to the fast electron transfer ensured by the cellular carbon. The exhibited dynamics-oriented materials design could open up an avenue to aid the further development of high-performance electrodes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Shan Ni,Hongnan Qu,Zihao Xu,Xiangyang Zhu,Huifang Xing,Li Wang,Jiemiao Yu,Huizhou Liu,Congmei Chen,Liangrong Yang
Heterogeneous electrocatalysis usually involves the charge transfer between the surface of electrocatalysts and corresponding reactants. Thus, modulating the surface electron density of electrocatalysts is an effective strategy to boost the electrocatalytic activity of targeted reactions. Herein, the NiSe 2 /FeSe 2 p-p heterojunction is constructed via a simple selenization method for both oxygen evolution reaction (OER) and urea oxidation reaction (UOR). The designed NiSe 2 /FeSe 2 electrocatalyst exhibits a superior activity towards OER, which only requires a low overpotential of 256 mV to reach a current density of 10 mA cm −2 , and surpasses other selenides and even the state-of-the-art RuO 2 . Impressively, when employed as the UOR electrode, the NiSe 2 /FeSe 2 heterojunction needs only 127 mV overpotential at 50 mA cm -2 , remarkably superior to other selenides and confirming the less energy consumption for UOR. The comprehensive analysis demonstrates that the well-designed built-in electric field at the heterointerface of NiSe 2 /FeSe 2 p-p heterojunction due to the difference of energy levels can expedite the charge transfer and thus strengthen the conductivity of heterojunction electrocatalyst. Moreover, the self-driven electron transfer across the NiSe 2 /FeSe 2 heterointerface can induce local charge redistribution at the interface region, which is beneficial for the adsorption of OH − and urea owing to the electrostatic interaction. Therefore, the designed NiSe 2 /FeSe 2 p-p heterojunction with regulated electronic structure displays extraordinary electrocatalytic activity for both the OER and UOR. This study demonstrates a novel strategy to manipulate the surface/interface charge states of electrocatalysts for improving the catalytic activity of OER and UOR, and provides new guidelines for exploring other superior electrocatalysts.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Hao Min,Minghua Li,Hongbo Shu,Xiaoqing Zhang,Ting Hu,Wenxi Wang,Yujin Zhou,Jian Jian,Xianyou Wang
Potassium ion batteries (KIB) have been considered as helpful alternative energy storage devices owing to the low-cost and abundant potassium sources. However, it is a critical challenge to explore suitable anode materials and electrolytes for adapting large radius and high activity of K ions. In this study, a novel FeSe 2 nanoparticle embedded in 3D honeycomb-like N-doped carbon architectures (FeSe 2 -NC) is synthesized through a simple solid-state strategy. Such unique architecture structure can not only provide a high-way for electron and K + transport, but also effectively alleviate volume variation during long-term K + intercalation/deintercalation process. Hence, FeSe 2 -NC as anode materials for KIB display a high discharge capacity of 460 mAh g −1 at 100 mA g −1 and excellent long-term cycling stability even at a high current density of 2 A g −1 . Beyond the electrochemical performance, it is found that storage K + of FeSe 2 -NC represents a conversion mechanism during discharge/charge in KIB. Furthermore, regulating the electrolyte salts via replacing potassium bis(fluorosulfonyl)imide (KFSI) electrolyte with potassium hexafluorophosphate (KPF 6 ) electrolyte can form a more uniform and robust solid electrolyte interphase film, which be responsible for the enhanced electrochemical performance. Therefore, it is helpful to understand the fundamentals of FeSe 2 -NC and promote the practical application of KIB.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）