JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Kaiyi Chen,Liang Zhang,Xin Huang,Fuchun Zhang,Gangqiang Zhu,Qizhao Wang
Zr-doped BiVO 4 photoanodes modified with CoF 2 co-catalyst (Zr-CoF 2 /BiVO 4 ) were designed and synthesized by a simple two-step hydrothermal and calcination method. The photocurrent density of the prepared Zr-CoF 2 /BiVO 4 photoanode is as high as about 3.6 mA/cm 2 at 1.23 V vs. RHE (AM 1.5 G). The excellent PEC performance benefits from the cocatalyst loading and the formation of heterojunction . The Zr-CoF 2 /BiVO 4 composite photoanode improves the transfer efficiency of photogenerated carriers and the yield of water splitting. Co 2+ site in the CoF 2 co-catalyst has excellent water oxidation activity. The metal Zr doping further improves charge separation and conduction, thereby reducing the electron-hole complexation rate to affect PEC performance, enhancing photocurrent as well as oxygen release and providing an effective reference method for exploring solar water decomposition. This scheme provides an effective reference method for exploring solar water decomposition.
研究领域:
材料科学
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光电化学
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太阳能转换
✓ 已验证
产品关联
DOI
高影响因子
Chemical Science
·
2022
·Vol. 13
·期 42
·12367-12373
·
IF 9.969
Siyuan Wang,Hao Fu,Jiamin Ma,Xiaomeng Shi,Huimin Wang,Zongyou Yin,Shuai Zhang,Mengdie Jin,Ziyun Zhong,Xinyun Zhai,Yaping Du
CoF2, with a relatively high theoretical capacity (553 mA h g−1), has been attracting increasing attention in the energy storage field. However, a facile and controllable synthesis of monodispersed CoF2 and CoF2-based nano-heterostructures have been rarely reported. In this direction, an eco-friendly and precisely controlled colloidal synthesis strategy to grow uniformly sized CoF2 nanorods and LiF-tipped CoF2-nanorod heterostructures based on a seeded-growth method is established. The unveiled selective growth of LiF nanoparticles onto the two end tips of the CoF2 nanorods is associated with the higher energy of tips, which favors the nucleation of LiF nanocrystals. Notably, it was found that LiF could protect CoF2 from corrosion even after 9 months of aging. In addition, the as-obtained heterostructures were employed in supercapacitors and lithium sulfur batteries as cathode materials. The heterostructures consistently exhibited higher specific capacities than the corresponding two single components in both types of energy storage devices, making it a potential electrode material for energy storage applications.
研究领域:
材料科学
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能量存储
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMBUSTION AND FLAME
·
2024
·
IF 5.8
Yuxiang Li,Kejuan Meng,Momang Tian,Lei Zhang,Xiaoxia Ma,Kaili Zhang
Metastable intermolecular composites (MICs) typically use Al as fuel and transition metal oxides as oxidizers , while their reactivities are hindered by the inert Al 2 O 3 passivation layer on the surface of Al particles . Recently, transition metal fluorides have emerged as novel fluorine-containing oxidizers for promoting the reactivity of metal fuels through interfacial fluorination of oxide layer . In this work, nanosized CoF 2 and Co 3 O 4 were prepared through pyrolysis of CoF 2 ·4H 2 O precursor using different calcination conditions. To investigate the function of CoF 2 in reaction and the influence of CoF 2 content on reactive performances, a series of MICs composed of n-Al, Co 3 O 4 , and CoF 2 were prepared through ultrasonic dispersion method. Thermal analysis indicated that Al/CoF 2 composite had significantly higher specific heat release (2.30 kJ/g) than that of Al/Co 3 O 4 composite (1.45 kJ/g), and CoF 2 facilitated the occurrence of exothermic reaction at a relatively lower temperature. AlF 3 was found as main reaction products of Al/CoF 2 at 650 °C, and AlF 3 sublimes at the temperature above 850 °C. Although the pressure output and flame intensity of Al/CoF 2 composite is lower than that of Al/Co 3 O 4 composite, hybrid Al/Co 3 O 4 /CoF 2 composites with 20 %–35 % CoF 2 showed significantly enhanced energetic performances compared with sole Al/Co 3 O 4 , suggesting that CoF 2 can function as an effective reaction modifier.
研究领域:
材料科学
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含能材料
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燃烧化学
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纳米材料
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2022
·
IF 4.654
Yujie Wang,Mingyu Zhang,Yuxuan Zhang,Yafeng Wang,Wenxin Liu,Chujie Yang,Veniamin Kondratiev,Feixiang Wu
Metal fluoride–lithium batteries have been viewed as very promising candidates for next-generation rechargeable batteries with higher energy densities. However, the intrinsic insulating properties of metal fluoride cathode lead to the poor reaction kinetics and unsatisfactory electrochemical performance. Herein, a honeycombed CoF2@C nanocomposite with a high specific surface area up to 180.4 m2 g–1, in which the nanosized CoF2 particles with size of 5–25 nm are evenly embedded in the honeycombed carbon framework, is prepared by the low-temperature fluorination of honeycombed Co@C nanocomposite precursor. As expected, the as-produced CoF2@C nanocomposite can deliver a high-capacity utilization of 365 mAh g–1 and an average capacity retention of 81.9% over 300 cycles at a current density of 110 mA g–1, as well as a reasonable capacity of 205 mAh g–1 at 1100 mA g–1. Such excellent electrochemical performance is due to the unique configuration that achieves the nanoconfinement of conversion reaction in the metal fluoride cathode. To be specific, on the one hand, the honeycombed structure provides uniformly isolated nanospace to inhibit the volume expansion and product agglomeration in the conversion reaction. On the other hand, the excellent reaction kinetics is attributed to the three-dimensional electron and ion conduction pathway, that is, the electrons are conducted through the honeycombed carbon walls, while Li+ are transferred via the interconnected honeycomb channels, facilitating the high-capacity utilization.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2019
·Vol. 62
·期 12
·1815-1820
·
IF 5.636
Wang Yanhong,Liu Hang,Fu Peng,Lu Hongcheng
A new one-dimensional (1D) antiferromagnetic transition metal hybrid fluoride CoF 2 (H 2 O) 2 (pyz) (pyz = pyrazine) together with two new isostructural MF 2 (H 2 O) 2 (pyz) (M = Ni 2+ , Zn 2+ ) have been successfully synthesized by the hydrothermal method. Their structures were determined by single crystal X-ray diffraction and they all crystallize in the same space group of C2/ m . The magnetic property of CoF 2 (H 2 O) 2 (pyz) 1 was measured and discussed. The Weiss constant of -20.6 K indicates dominant antiferromagnetic interaction and the effective magnetic moment of about 5.66 μ B suggests large unquenched orbital contribution and anisotropy in 1. The quantum fluctuations in the quasi-1D antiferromagnet of 1 prevent the appearance of long range magnetic order until 2.9 K, suggesting good 1D magnetism.
研究领域:
材料化学
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固态化学
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磁性与磁性材料
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无机化学
·
低维量子系统
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Huimin Jiang,Hong Wang,Kaiyu Liu,Zhe Feng,Sarah Alharthi,Mohammed A. Amin,Jianjian Lin
Transition metal fluorides because of the high electronegativity of fluorine may enhance the local electron density of the metal sites and promote water molecule dissociation and charge transfer. However, enhancing the intrinsic activity of fluorides to improve material stability remains a challenge. Herein, we develop an innovative four-step synthetic strategy (electrochemical deposition → co-precipitation → ligand exchange → in situ fluorination) to engineer three-dimensional porous Fe-doped CoF 2 nanocubes vertically anchored on MXene (Fe-CoF 2 /MXene/NF). This breakthrough achievement lies in the construction of a rapid mass transfer structure: porous cubes increase the contact area of reactants and create convection channels to achieve rapid bubble separation. The synergistic effect of Fe-doped CoF 2 and MXene not only optimizes the adsorption of intermediates but also promotes rapid electron transfer at the interface, and robust structural robustness. Remarkably, the optimized catalyst achieves low overpotentials of 121 mV (hydrogen evolution reaction, HER) and 210 mV (oxygen evolution reaction, OER) at 10 mA cm −2 , surpassing most reported transition metal fluorides. Notably, it enables efficient overall water splitting at an ultralow cell voltage of 1.52 V (10 mA cm −2 ) while maintaining 98 % activity after 100-h continuous operation. This work establishes a synergistic strategy to enhance catalytic activity by simultaneously modulating electronic configurations and accelerating charge transfer kinetics, achieved through rational structural design integrating organic framework derivatization, the coupling of metal doping with interfacial engineering.
研究领域:
材料科学
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电化学
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催化
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纳米技术
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能量转换
·
无机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yanwei Zhu,Lang Gan,Jianqiao Shi,Gen Huang,Hongmei Gao,Li Tao,Shuangyin Wang
The structural design and atomic adjustment of the catalyst are the main factors that regulate the intrinsic electrocatalytic activity. Herein, we report a novel and facile strategy of synthesizing three-dimensional porous carbon network by polymer-assisted molding strategy. The porous carbon framework with Co-CoF 2 and carbon nanotubes (PCF@CCFCNT) was directly obtained by the calcination, in which Co-CoF 2 heterojunctions uniformly dispersed in the interconnected holes. Benefiting from the special hierarchical porous morphology, the dual-function catalytic activity of Co-CoF 2 heterojunctions and existence of Co-N x species, the as-obtained PCF@CCFCNT composites exhibit excellent performance in the oxygen evolution reaction (η = 300 mV@10 mA cm −2 ), as well as outstanding oxygen reduction reaction performance in alkaline medium (E 1/2 = 0.852 V, vs RHE). Moreover, as an air electrode in Zn-air batteries (ZABs), PCF@CCFCNT demonstrates a large peak power density of 184 mW cm −2 and superior long-term stability, which is much more stable than the one consisting of commercial Pt/C. This finding not only shows a simple composite design to achieve high-performance ZABs but also may stimulate the rapid development of 3D hierarchical porous electrocatalysts for advanced energy technologies.
研究领域:
材料科学
·
电化学能源
✓ 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）