JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Hao Guo,Hao Zhang,Ning Wu,Zhilan Pan,Cuiliu Li,Yuan Chen,Yujuan Cao,Wu Yang
In this article, a trimesic acid-mediating control synthesis strategy was proposed for preparing the NiCo-MOF composition structure of microsphere and nanosheet by substituting 1,4-dicarboxybenzene with trimesic acid. Then the pre-synthesized MOF , as a precursor and template, was further vulcanized by a facile hydrothermal method to obtain hollow microsphere and nanosheet interleaved nickel and cobalt bimetallic sulfide materials (NiCo-S) while these microspheres and nanosheets were composed of smaller nanoparticles . This unique structure endowed quick electron/ion transport and electrolyte penetration as well as abundant redox active sites, significantly facilitating electrochemical performance. The obtained NiCo-S-2 showed higher specific capacitance (1790.4 F g −1 ) than its precursor NiCo-MOF-2 and other molar ratios of counterparts. Using it as an positive electrode and activated carbon (AC) as negative electrode, the assembled asymmetric supercapacitor NiCo-S-2//AC also delivered a high specific capacitance of 114.4 F g −1 and big specific energy of 35.5 Wh kg −1 at 799.99 W kg −1 .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Soft Matter
·
2024
·
IF 2.9
Yu Cao,Mingji Wu,Yu Chen,Xiaomiao Feng
Flexible two-dimensional nickel-cobalt metal-organic frameworks/graphene oxide/carbon nanotubes hybrid films (2D NiCo-MOF/GO/CNTs) have been designed and prepared as high-performance supercapacitor electrode materials via vacuum filtration. The 2D NiCo-MOF nanosheets serve as the main source of capacitance for the hybrid films, while CNTs function as both the conductive network, enhancing the electrical conductivity of the MOFs, and the binder, linking the 2D NiCo-MOF nanosheets and GO. When the mass ratio of 2D NiCo-MOF, GO, and CNTs is 2:1:0.5, the hybrid film exhibits a high specific capacitance of 40.3 F g-1 at 0.4 A g-1. Furthermore, the film electrode demonstrates outstanding cycling stability, with a capacitance retention of 96.3% after 2000 cycles at 1 A g-1. Notably, the CV curves of the asymmetric supercapacitor (ASC) show almost no change after multiple bending, indicating excellent flexibility. Additionally, two devices connected in series can light an LED, demonstrating significant potential for practical applications.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 26
·14004-14010
·
IF 6.895
Cong Li,Xing-Jia Li,Zhong-Yin Zhao,Fei-Long Li,Jiang-Yan Xue,Zheng Niu,Hong-Wei Gu,Pierre Braunstein,Jian-Ping Lang
The development of metal–organic frameworks (MOFs) as high-efficiency electrocatalysts for water splitting has attracted special attention due to their unique structural features including high porosity, large surface areas, high concentrations of active sites, uniform pore sizes and shapes, etc. Most of the related reports focus on the in situ generation of high-efficiency electrocatalysts by annealed MOFs. However, the pyrolysis process usually destroys the porous structure of MOFs and reduces the number of active sites due to the absence of organic ligands and agglomeration of metal centers. In this work, we prepared unique NiCo-MOF hollow nanospheres (NiCo-MOF HNSs) by a solvothermal method and further fabricated Fe-doped NiCo-MOF HNSs (Fe@NiCo-MOF HNSs) by a simple impregnation-drying method. Significant enhancement of electrocatalytic activity of Fe@NiCo-MOF HNSs was witnessed because of the doped Fe. Compared with the parent NiCo-MOF HNSs, the optimized Fe@NiCo-MOF HNSs exhibited a lower overpotential of 244 mV at 10 mA·cm−2 with a smaller Tafel slope of 48.61 mV·dec−1, which was lowered by ca. 90 mV due to the influence of Fe doping on the electronic structure of the active centers of Ni and Co. The above materials also displayed excellent stability without obvious activity decay for at least 16 hours. These findings present a new entry in the design and fabrication of high-efficiency MOF-based electrocatalysts for energy conversion.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Shuai Wu,Debin Cai,Zhen Tian,Li Guo,Yanzhong Wang
Metal-organic frameworks (MOFs) have garnered significant attention as supercapacitor electrode materials on account of their large specific surface area, regulatable structure and composition. However, the serious aggregation and low active sites result in the low specific capacitance and impede their application for high-performance supercapacitor. Herein, two-dimensional NiCo-MOF@LDH hybrid nanosheets were synthesized by a one-step solvothermal process utilizing 1, 4-terephthalic acid and urea. The hydrolysis of urea releases OH − that not only serves as the deprotonation of terephthalic acid but also react with Ni and Co ions to produce NiCo-LDH nanosheets . The produced NiCo-MOF@LDH-2 nanosheets displays high specific capacitance of 1873.9 F g −1 at 0.5 A g −1 as well as excellent rate performance. Furthermore, the constructed asymmetric supercapacitor device has a high energy density of 49.8 Wh kg −1 when the power density is 422.4 W kg −1 . Meanwhile, the capacitance retention can maintain 83 % after 10,000 cycles even at a current density of 5 A g −1 . The excellent electrochemical properties of NiCo-MOF@LDH are assigned to the high specific surface area and abundant active sites generated by the cross-linked nanosheet structure.
研究领域:
材料科学
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能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Tinghai Yang,Rengui Xiao,Fenglian Lu,Xiang Ke,Mengxia Wang,Keliang Wang
Metal–organic frameworks (MOFs) are considered highly promising anode materials for lithium-ion batteries (LIBs) due to their unique physical and chemical properties. However, the low electrical conductivity of single-metal MOF materials limits their application in LIBs. To overcome this challenge, this work designed and synthesized a bimetallic NiCo-MOF material with a hollow spherical structure. Through a combination of theoretical and experimental methods, we explored the differences in conductive mechanisms between Ni-MOF and NiCo-MOF, as well as their electrochemical performance as anode materials for lithium-ion batteries. Specifically, the average electrical conductivity of NiCo-MOF is 0.058 mS cm−1, which is 34 times that of Ni-MOF (0.0017 mS cm−1). Density functional theory (DFT) calculations indicate that the increase in conductivity is due to the introduction of Co2+, which increases the electron transport pathways and significantly boosts carrier concentration. Compared to Ni-MOF, NiCo-MOF has 19 additional electrons at the Fermi level. This enhanced conductivity also results in a more significant electrochemical performance; under 2C conditions, NiCo-MOF maintains a specific capacity of 696.3 mA h g−1 after 200 cycles, which is twice that of Ni-MOF (299.9 mA h g−1). This work provides a potential strategy for improving the conductivity of MOF materials and their application in lithium-ion batteries.
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
Nanomaterials
·
2020
·Vol. 10
·期 4
·695
·
IF 4.324
Yijun Liu,Ying He,Elif Vargun,Tomas Plachy,Petr Saha,Qilin Cheng
To improve Li storage capacity and the structural stability of Ti3C2MXene-based electrode materials for lithium-ion batteries (LIBs), a facile strategy is developed to construct three-dimensional (3D) hierarchical porous Ti3C2/bimetal-organic framework (NiCo-MOF) nanoarchitectures as anodes for high-performance LIBs. 2D Ti3C2nanosheets are coupled with NiCo-MOF nanoflakes induced by hydrogen bonds to form 3D Ti3C2/NiCo-MOF composite films through vacuum-assisted filtration technology. The morphology and electrochemical properties of Ti3C2/NiCo-MOF are influenced by the mass ratio of MOF to Ti3C2. Owing to the interconnected porous structures with a high specific surface area, rapid charge transfer process, and Li+diffusion rate, the Ti3C2/NiCo-MOF-0.4 electrode delivers a high reversible capacity of 402 mAh g−1at 0.1 A g−1after 300 cycles; excellent rate performance (256 mAh g−1at 1 A g−1); and long-term stability with a capacity retention of 85.7% even after 400 cycles at a high current density, much higher than pristine Ti3C2MXene. The results highlight that Ti3C2/NiCo-MOF have great potential in the development of high-performance energy storage devices.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
DOI
高影响因子
Energy Technology
·
2019
·Vol. 7
·期 6
·1900018
·
IF 3.163
Jianhua Yu,Xiaolei Gao,Zhenxing Cui,Yu Jiao,Qian Zhang,Hongzhou Dong,Liyan Yu,Lifeng Dong
Recently, binary transition metal oxides, phosphates, and sulfides have attracted wide attention due to their potential applications in supercapacitors. The emergence of metal-organic frameworks (MOFs) provides new opportunities for the synthesis and investigation of porous binary metal compounds with similar microstructures. Herein, binary metal oxide (NiCo-O) tubular structures are derived from NiCo-MOF-74 via a facile annealing process, and then phosphate (NiCo-P) and sulfide (NiCo-S) structures are obtained from NiCo-O by heat treatment and solvothermal process, respectively. Among the three derivatives, NiCo-S with nanosheet structures has the highest specific capacitance of 930.4 F g −1 at a current density of 1 A g −1 and an excellent rate capability with a retention of ≈80% at 10 A g −1 . The long-term cycling performance of NiCo-S is superior with 70.5% retention after 10 000 cycles. The hybrid supercapacitor device with NiCo-S and activated carbon as positive and negative electrodes delivers a high energy density of 22.6 W h kg −1 at a power density of 800 W kg −1 . The excellent performance of NiCo-S can be attributed to its nanosheet structure, which increases the specific surface area and electroactive sites.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2019
·
IF 2.291
Xiaoqin Wang,Nana Yang,Qiaoqin Li,Fan He,Yufei Yang,Bohua Wu,Jia Chu,Anning Zhou,Shanxin Xiong
In view of the poor electronic conductivity and inferior structural stability, the direct application of Metal-Organic Frameworks (MOFs) as an electrode material is limited. Herein, the carboxylated multi-wall carbon nanotubes (MWCNT) are utilized as a substrate for the in-situ growth of bimetallic NiCo-based MOFs (NiCo-MOF). The flower-string-like NiCo-MOF/MWCNT composites are successfully synthesized using 4, 4′-biphenyldicarboxylic acid (BPDC) as a ligand via a simple solvothermal approach. In the composites, MWCNT is wrapped with 2D NiCo-MOF nanosheets through some bonds or affinity between MWCNT and NiCo-MOF. Meanwhile, the MWCNT presence does not affect the formation of the NiCo-MOF crystals. Compared with the hydrangea-like NiCo-MOF microspheres , the flower-string-like composite structures are more loosely assembled by NiCo-MOF nanosheets. Owing to the guiding effect of MWCNT on the NiCo-MOF growth, many well-dispersed flower-string-like structures can be achieved by adjusting MWCNT dosages. Due to the unique hierarchical structure and good synergistic effect, the NiCo-MOF/MWCNT composites exhibit excellent capacitance performances. The optimal composites demonstrate a large specific capacitance of 1010 F g −1 at 0.5 A g −1 , a good rate capability (760 F g −1 even at 10 A g −1 ), a good cycling stability and reversibility with the capacitance retention of 828 F g −1 (100% of the initial capacitance) and coulombic efficiency of approximate 98% at 5 A g −1 after 3000 cycles, a low internal resistance and charge transfer resistance. The asymmetric supercapacitor assembled by NiCo-MOF/MWCNT composites as electrode materials has high energy density even at high power density, good rate capability, excellent cycling stability and reversibility. Hence, the as-synthesized NiCo-MOF/MWCNT composites are a promising high-performance electrode material for supercapacitors .
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Weidong Liu,Yihao Gao,Limin Wang,Yaqiong Gong
Hydrogen energy is the only new energy that meets the requirements of resources, environment and sustainable development due to its advantages such as rich resources, diverse sources, storable, renewable, high calorific value , clean and pollution-free. Electrochemical water splitting technology can achieve large-scale hydrogen production commercially, but the slow kinetics of OER process seriously hinders the development of electrochemical water splitting technology, therefore, high-efficiency and low-cost OER electrocatalyst is urgently needed. Here, we synthesized a layered ternary hydroxide NiCoFe-LTH@NiCo-MOF/NF-30 electrocatalyst with NiCo-MOF as the sacrificial template on conductive substrate nickel foam by a two-step solvothermal method , which requires only low overpotentials of 207 mV and 283 mV to achieve current densities of 10 mA cm −2 and 100 mA cm −2 , respectively. Tafel slope is as low as 78.44 mV dec −1 , and favorable electrochemical stability can be maintained for at least 50 h. The strategy may provide valuable references for future researchers to prepare better MOF-based electrocatalysts.
研究领域:
材料科学
·
电化学
·
能源材料
·
催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Jingwei Huang,Wei Luo,Xiaoli Yuan,Jing Wang
In this work, bimetallic NiCo-MOF was fabricated on BiVO 4 by method of electrostatic attraction and then calcined to prepare Ni x Co 1−x O/BiVO 4 composite photoanode. The obtained Ni x Co 1−x O with high porosity and surface area showed excellent oxygen evolution performance. It is found that Ni x Co 1−x O acting as a strong hole extraction increases the rate of surface water oxidation by promoting charge separation efficiency. As a result, this composite photoanode can provide a photocurrent of 3.2 mA/cm 2 at 1.23 V vs RHE (0.5 M Na 2 SO 4 , AM 1.5 G illumination), far larger than that of pure BiVO 4 photoanode. The enhanced performance can be ascribed to synergistic effect between Ni and Co, which plays an important role for boosting water oxidation.
研究领域:
材料科学
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
ChemElectroChem
·
2017
·Vol. 4
·期 12
·3037-3041
·
IF 4.136
Dan Ping,Xiao Feng,Jun Zhang,Jianming Geng,Xinfa Dong
Graphical Powered by carbon : A NiCo alloy@C/Ni x Co 1- x O/NF hierarchical nanocomposite fabricated from carbonization of the bimetallic NiCo-MOF/NiCoLDH/NF template showed excellent electrocatalytic activity for the oxygen evolution reaction. Specifically, it exhibited a very low overpotential of 300 mV at a current density of 100 mA cm −2 . LDH=layered double hydroxide, NF=Ni foam, MOF=metal−organic framework. Hierarchically structured bimetallic NiCo-MOF/LDH/Ni foam (NiCo-MOF/LDH/NF; MOF=metal−organic framework, LDH=layered double hydroxides) composites were successfully fabricated by means of the in situ growth of NiCo-MOF on the NiCo LDH buffer-layer-modified NF surface. After carbonization, the derived NiCo alloy@C/Ni x Co 1- x O/NF hierarchical nanocomposite showed excellent electrocatalytic activity with respect to the oxygen evolution reaction (OER); specifically, it exhibited a very low overpotential of 300 mV at a current density of 100 mA cm −2 . The outstanding OER activity of the composite may be attributed to the open structure of the nanocomposite, the formation of the highly dispersed CoNi alloy, and the synergistic interaction between CoNi@C and Ni x Co 1- x O. This work introduces a new strategy for constructing advanced hierarchically structured nanocomposites for diverse applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Physica Status Solidi-Rapid Research Letters
·
2025
·
IF 2
Yi Chen,Cong Liu,Ruixue Sun,Guojie Yin,MR. Manikandan,Yifan Lv,Jingyu Shi,Yu Hao,Rui Liu,Yanchun Hu,Shaoqian Yin,Xianwei Wang
In this study, we investigate the effect of varying tannic acid (TA) concentrations on the electrochemicalperformance of NiCo-MOF-derived nanocomposite electrode materials. The TA@NiO@NiCo 2 O 4 nanocomposites were synthesized using a straightforward metal–organic framework (MOF) templating strategy, which involved a simple hydrothermal method followed by a two-step annealing process. Electrochemical characterization reveals that the resulting nanocomposites exhibit excellent cycling stability. Among them, the sample treated with 0.02 mol L −1 TA achieves the highest specific capacitance, reaching 773 F g −1 at a current density of 1 A g −1 . Furthermore, the nanocomposites display reduced electrical impedance, with the 0.02 mol L −1 TA sample recording a series resistance (Rs) as low as 0.60 Ω. After 5000 galvanostatic charge–discharge cycles, the capacity retention of samples treated with TA concentrations of 0, 0.01, and 0.02 mol L −1 all exceed 100%, indicating remarkable electrochemical durability.
研究领域:
材料科学
·
电化学
·
储能
✓ 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）