Core–shell crystalline ZIF-67@amorphous ZIF for high-performance supercapacitors

Hu, Chuanzheng; Xu, Jingli; Wang, Yazhen; Wei, Meng; Zhen, Lu; Chen, Cao

doi:10.1007/s10853-020-05163-8

Cited by 56 publications

(22 citation statements)

References 54 publications

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“…a) depicts the ndings of ZIF-67. Certain signicant diffraction peaks occurred in 2q ¼ 10.5 , 12.7 , 14.6 , 16.6 , 18.2 and 26.1 as seen in the resulting pattern, which may be independently conrmed with the sample ZIF-67 and are consistent with the literature 34. Fig.…”

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confidence: 87%

Decorating MnO₂ nanosheets on MOF-derived Co₃O₄ as a battery-type electrode for hybrid supercapacitors

et al. 2022

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confidence: 87%

Decorating MnO₂ nanosheets on MOF-derived Co₃O₄ as a battery-type electrode for hybrid supercapacitors

et al. 2022

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“…These phenomena imply that H atoms on the N-H bonds are substituted by the metal ions during the coordination process, an indication for the successful preparation of ZIFs. [38,39] Scanning electron microscope (SEM) and transmission electron microscope (TEM) were employed to investigate the morphology of the as-prepared Co-based MOFs. Compared with smooth carbon fibers of bare CC (Figure S1, Supporting Information), one can see homogeneous growth of Co MOFs nanosheets on the CC (Figure 2a,b and Figure S2, Supporting Information).…”

Section: Characterization Of Com Mofs/ccmentioning

confidence: 99%

Understanding the Effect of Second Metal on CoM (M = Ni, Cu, Zn) Metal–Organic Frameworks for Electrocatalytic Oxygen Evolution Reaction

Zhang

et al. 2021

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anode because of the sluggish reaction kinetics and high barrier for the formation of OO bond. [6,7] Noble metalbased catalysts such as IrO 2 and RuO 2 exhibit excellent OER activity, but their high cost and non-renewability limit the wide-spread applications. [8][9][10][11] Therefore, it is of great importance to develop costeffective and stable non-noble metalbased electrocatalysts. [12][13][14][15][16][17][18] Metal-organic frameworks (MOFs), with highly dispersed metal sites, intrinsic high porosity, and high internal surface area, have been considered as potential non-noble metal-based catalysts for OER. [19][20][21][22][23] Among the various MOFsbased OER catalysts, Co-based MOFs have received extensive attention due to the high activity and stability. [24,25] More importantly, the structural flexibility of most Co-based MOFs allows the design and fabrication of bimetallic MOFs with different second metal, leading to higher catalytic performance. [26][27][28][29][30][31][32] For example, Li et al. reported that the CoZn bimetallic MOFs could exhibit OER activity with the overpotential of 320 mV at a current density of 10 mA cm −2 due to dimensionality and pore-geometry. [33] Furthermore, Bu et al. reported that the CoNi bimetallic 2D-MOFs exhibited excellent OER activity with the overpotential of 240 mV at 10 mA cm −2 , thanks to the CoNi coupling effect and the unsaturated active sites. [34] However, although plenty of efficient Co MOFs-based bimetallic OER catalysts have been developed, to the best of our knowledge, the effect of different second metal on the OER catalytic performance of Co-based MOFs has not been systematically investigated. What is worse, it is inappropriate to compare the results in reported works directly, because the reported Co-based MOFs may be different in coordination environment, dimension, and amount of second metal.Herein, we introduce different metal (M = Ni, Cu, Zn) into typical Co MOFs (i.e., ZIF-67) and further study their catalytic performance for OER in alkaline media to uncover the secondmetal effect for Co MOFs. These MOFs were grown on conductive carbon cloth (CC) immediately through a one-step roomtemperature strategy (marked as CoM MOFs/CC). [35] The order of OER activity, which is reflected by overpotential and Tafel slope, for these Co-based MOFs is found to be CoZn MOF/CC > CoNi MOF/CC > CoCu MOF/CC > Co MOF/CC. Furthermore, by Co-based bimetallic metal-organic frameworks (MOFs) have emerged as a kind of promising electrocatalyst for oxygen evolution reaction (OER). However, most of present works forCo-based bimetallic MOFs are still in try-and-wrong stage, while the OER performance trend and the underlying structure-function relationship remain unclear. To address this challenge, Cobased MOFs on carbon cloth (CC) (CoM MOFs/CC, M = Zn, Ni, and Cu) are prepared through a room-temperature method, and their structure and OER performance are compared systematically. Based on the results of overpotential and Tafel slope, the order of OER activity is ordered in the de...

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“…The peaks located at 2 θ = 7.2°, 10.3°, 12.7°, 16.4 o, and 17.8° can be assigned to the (011), (011), (112), (013), and (222) planes of rhombic dodecahedron crystal in our previous report. [ 51 ]…”

Section: Resultsmentioning

confidence: 99%

“…The specific capacitance of ZIF‐90@ZIF‐67 is also superior to those of ZIF‐7@ZIF‐67 and ZIF‐67@amorphous ZIF‐based electrodes in our previous reports. [ 46,51 ] When the current density is increased from 1 to 20 A g −1 , the rate capability with 55.4% retention is acquired at the ZIF‐90@ZIF‐67‐based electrode, while ZIF‐90 and ZIF‐67 only maintain 47.3% and 31.7%. The results further demonstrated that the core–shell‐structured material can improve the electrochemical performance due to the synergistic effect of the inner and outer material.…”

Section: Resultsmentioning

confidence: 99%

Novel Core–Shell‐Structured Zeolitic Imidazolate Framework (ZIF)‐90@ZIF‐67 Applied for High‐Performance All‐Solid‐State Asymmetric Supercapacitor

Qian

Kong

et al. 2022

Energy Tech

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Herein, a core–shell structured zeolitic imidazolate framework (ZIF)‐90@ZIF‐67 is successfully synthesized with higher specific area and more micropores by a seed epitaxial growth method at room temperature, combining both the advantages of ZIFs and core–shell‐structured materials. When it is applied for supercapacitors’ electrode materials, ZIF‐90@ZIF‐67 delivers the best energy storage ability and excellent electrochemical stability. In a three‐electrode system, its specific capacitance reaches 1357.8 F g−1 at 1 A g−1 and maintains 55.4% while increasing the current density from 1 A g−1 to 20 A g−1. In a two‐electrode system, an all‐solid‐state asymmetric supercapacitor is assembled using ZIF‐90@ZIF‐67 and activated carbon (CV) as the positive and negative electrode material. The simple device exhibits a high specific capacitance of 151.6 F g−1 at 0.5 A g−1 and a high energy density of 53.9 Wh kg−1 at 510.2 W kg−1. Surprisingly, the device achieves a specific capacitance retention of 95.8% after 10 000 cycles at 10 A g−1. Finally, two simple all‐solid‐state supercapacitors in series power a blue lighting‐emitting diode for over 13 min, which reveals that the core–shell ZIF‐90@ZIF‐67 has great potential application prospects in the field of energy storage.

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Core–shell crystalline ZIF-67@amorphous ZIF for high-performance supercapacitors

Cited by 56 publications

References 54 publications

Decorating MnO₂ nanosheets on MOF-derived Co₃O₄ as a battery-type electrode for hybrid supercapacitors

Decorating MnO₂ nanosheets on MOF-derived Co₃O₄ as a battery-type electrode for hybrid supercapacitors

Understanding the Effect of Second Metal on CoM (M = Ni, Cu, Zn) Metal–Organic Frameworks for Electrocatalytic Oxygen Evolution Reaction

Novel Core–Shell‐Structured Zeolitic Imidazolate Framework (ZIF)‐90@ZIF‐67 Applied for High‐Performance All‐Solid‐State Asymmetric Supercapacitor

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Core–shell crystalline ZIF-67@amorphous ZIF for high-performance supercapacitors

Cited by 56 publications

References 54 publications

Decorating MnO2 nanosheets on MOF-derived Co3O4 as a battery-type electrode for hybrid supercapacitors

Decorating MnO2 nanosheets on MOF-derived Co3O4 as a battery-type electrode for hybrid supercapacitors

Understanding the Effect of Second Metal on CoM (M = Ni, Cu, Zn) Metal–Organic Frameworks for Electrocatalytic Oxygen Evolution Reaction

Novel Core–Shell‐Structured Zeolitic Imidazolate Framework (ZIF)‐90@ZIF‐67 Applied for High‐Performance All‐Solid‐State Asymmetric Supercapacitor

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Decorating MnO₂ nanosheets on MOF-derived Co₃O₄ as a battery-type electrode for hybrid supercapacitors

Decorating MnO₂ nanosheets on MOF-derived Co₃O₄ as a battery-type electrode for hybrid supercapacitors