Nickel/cobalt bimetallic metal-organic frameworks ultrathin nanosheets with enhanced performance for supercapacitors

Zhang, Xiaolong; Wang, Jiemei; Ji, Xiang; Sui, Yanwei; Wei, Fuxiang; Qi, Jiqiu; Meng, Qingkun; Ren, Yaojian; He, Yezeng

doi:10.1016/j.jallcom.2020.154069

Cited by 156 publications

(57 citation statements)

References 32 publications

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“…, simultaneously, the weak peaks at 861.94 and 879.89 eV are shakeup satellite peaks. [31] For the Co 2p survey spectrum of Co(OH)F@NiCo-LDH nanocages (Figure 2(c)), two sharp peaks, at 781.63 and 797.28 eV, which can be attributed to the NiCo-LDH. [39] In addition, the binding energies at 791.5 and 775.86 eV prove the existence of Co 3+ .…”

Section: Resultsmentioning

confidence: 98%

“…Metal-organic frameworks (MOFs), consisting of metal center ions (or clusters) and organic linkers, are promising materials in various fields because of their tunable microporosity, controllable particle size, and high surface areas. [30][31][32][33][34] As an indispensable member of MOFs, zeolite imidazole framework materials (ZIFs) have been proven to be a promising sacrificial template for constructing multi-dimensional nanostructures. For example, Tahir et al [35] prepared a 3D hollow CoNi-LDH nanocage by using CoNi-based ZIF as the sacrificial template.…”

Section: Introductionmentioning

confidence: 99%

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Constructing Co(OH)F Nanorods@NiCo‐LDH Nanocages Derived from ZIF‐67 for High‐Performance Supercapacitors

Zhang

Wang

et al. 2021

Adv Materials Inter

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The energy storage behavior of amorphous carbon is mostly dependent on the electrostatic interaction between the surface of the conducting electrode and the electrolytic ions. Therefore, the energy densities of commercial SCs are relatively low. [9] This essential defect seriously hinders the application of SCs in energy transformation system, so improving the energy density of them is an urgent problem. For this reason, a lot of pseudocapacitor materials with battery characteristics have been developed with the purpose of enhancing the energy density of SCs, including such as conjugated polymers [10,11] and transition metal compounds. [12,13] Transition-metal hydroxides are ideal pseudocapacitive materials for pseudocapacitors because of their large theoretical capacity. [14,15] Thus, intensive research work has been carried out to develop hydroxides with high pseudocapacitance performance. To date, a variety of low-cost hydroxides such as Ni(OH) 2 , [16,17] Co(OH) 2 , [18] CoAl-LDH, [19] CoFe-LDH, [20] NiMn-LDH, [21] NiCo-LDH, [22] and NiCu-LDH [23] have been widely investigated. However, these battery-type hydroxides usually possess poor electrical conductivity and relatively large volume changes during fast charge-discharge tests, thus leading to low cycling stability and poor rate capability. [24,25] The electronic conductivity and structural stability of layered double hydroxide (LDH) can be improved by heteroatomic doping. The heteroatom-doped LDH possesses large amounts of electronholes resulting from lattice distortion, thus increasing the electronic conductivity of LDH. Recently, Niu et al. [26] synthesized a N, C double-doped NiCo-LDH by hydrothermal reaction. The resultant sample exhibited an outstanding discharge capacitance of 606.9 C g −1 at 2 mV s −1 . In addition, N-C doping can greatly improve the rate capability and cycling stability.The logical microstructure design of transition-metal hydroxides at the nanoscale is another effective method to enhance the pseudocapacitance performance. [27] Among a variety of nanostructures, multi-dimensional nanostructures with welldefined inner void spaces and hierarchical nanocages can effectively avoid the self-aggregation of transition-metal hydroxides. The porous nanostructure is also appropriate for the infiltration of electrolyte ions and fast faraday reaction of active species. In addition, the nanocages are composed of interlaced ultrathin nanosheets, which possess rich electrochemically active sites and high superficial areas. Thus, the construction of

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Constructing Co(OH)F Nanorods@NiCo‐LDH Nanocages Derived from ZIF‐67 for High‐Performance Supercapacitors

Zhang

Wang

et al. 2021

Adv Materials Inter

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“…As shown in Figure 1 a and summarized in Table 1 , Zhang et al [ 30 ] synthesized spherical NiCo-BTC (Ni:Co ratio of 2:1) consisting of ultra-thin nanosheets through a one-step hydrothermal reaction. With the advantageous combination of unique structures and mixed-metallic components, the fabricated NiCo-BTC electrode shows a higher specific capacity (568 C g −1 at 1 A g −1 ) and better cycling stability (75.5% retention over 3000 charge/discharge cycles) than pure Ni-BTC (SC: 407 C g −1 at 1 A g −1 , retention: ~35% after 3000 cycles) in 2 mol/L KOH electrolyte.…”

Section: Pristine Mofs or Mofs Composites Directly Used For Scsmentioning

confidence: 99%

“… ( a ) Preparations scheme and morphology of Ni(/Co)-BTC [ 30 ] and ( b ) morphology of Ni 3− x Co x (BTC) 2 ·12H 2 O] ( x ≈ 0.25) [ 31 ]. Reproduced with permission from Reference [ 30 ], 2020, Elsevier and [ 31 ] 2019, Elsevier. …”

Section: Figurementioning

confidence: 99%

The Application of Metal–Organic Frameworks and Their Derivatives for Supercapacitors

et al. 2020

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Supercapacitors (SCs), one of the most popular types of energy-storage devices, present lots of advantages, such as large power density and fast charge/discharge capability. Being the promising SCs electrode materials, metal–organic frameworks (MOFs) and their derivatives have gained ever-increasing attention due to their large specific surface area, controllable porous structure and rich diversity. Herein, the recent development of MOFs-based materials and their application in SCs as the electrode are reviewed and summarized. The preparation method, the morphology of the materials and the electrical performance of various MOFs and their derivatives (such as carbon, metal oxide/hydroxide and metal sulfide) are briefly discussed. Most of recent works concentrate on Ni-, Co- and Mn-MOFs and their composites/derivatives. Conclusions and our outlook for the researches are also given, which would be a valuable guideline for the rational design of MOFs materials for SCs in the near future.

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“…The cycling stability in both three‐ and two‐electrode system is estimated with the capacitance retention after a specific charge‐discharge cycle number by either CV or GCD method. However, in a few cases, especially those for battery‐SC hybrid applications, the authors only reported the specific capacity (in C g −1 /C cm −2 /C cm −3 or mAh g −1 /mAh cm −2 /mAh cm −3 ) of the electrode materials based on metal‐organic compounds 25‐39 . Considering that the specific capacitance is the parameter reported in the most research papers of SC discipline, those literatures which only reported the specific capacity of transition metal‐organic compounds of the first transition metal series as SC electrode materials are not included in this review.…”

Section: Introductionmentioning

confidence: 99%

Supercapacitor electrodes based on metal‐organic compounds from the first transition metal series

Chen

Xie

et al. 2021

EcoMat

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Metal‐organic compounds, including molecular complexes and coordination polymers, have attracted much attention as electrode materials in supercapacitors owing to their large surface area, high porosity, tailorable pore size, controllable structure, good electrochemical reversibility, and abundant active sites. Among the variety of metal‐organic compounds exhibiting desired supercapacitor performances (high specific capacitance, long cycling life, high energy density, and power density), those with metals in the first transition metal series are the most studied due to their rich covalent states, light atom weight, environmental‐friendliness, non‐toxicity, and low cost. In this review, the recent reports on the metal‐organic compounds of the first transition metal series as electrode materials in supercapacitors are summarized and their electrode and device performances are discussed in terms of different metal elements and typical multidentate ligands. Moreover, the current challenges, design strategies, future opportunities and further research directions are also highlighted for metal‐organic compounds in the field of supercapacitors.

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Nickel/cobalt bimetallic metal-organic frameworks ultrathin nanosheets with enhanced performance for supercapacitors

Cited by 156 publications

References 32 publications

Constructing Co(OH)F Nanorods@NiCo‐LDH Nanocages Derived from ZIF‐67 for High‐Performance Supercapacitors

Constructing Co(OH)F Nanorods@NiCo‐LDH Nanocages Derived from ZIF‐67 for High‐Performance Supercapacitors

The Application of Metal–Organic Frameworks and Their Derivatives for Supercapacitors

Supercapacitor electrodes based on metal‐organic compounds from the first transition metal series

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