Design and Fabrication of Hierarchical NiCoP–MOF Heterostructure with Enhanced Pseudocapacitive Properties

He, Shixue; Guo, Fengjiao; Yang, Qi; Mi, Hongyu; Li, Jingde; Yang, Nianjun; Qiu, Jieshan

doi:10.1002/smll.202100353

Cited by 125 publications

(39 citation statements)

References 71 publications

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“…The capacitive contribution from CV curves (Figure 4e) is calculated to be 67.9% at 30 mV s −1 (Figure 4f), revealing a capacitive and diffusion mixed mechanism. 48,49 In addition, the contribution from the capacitive-limited process increases from 53.7 to 79.6% under the enhanced sweep rates from 5 to 50 mV s −1 (Figure 4g), which is beneficial for achieving high power property in a fast charge/discharge process. Figure 4h presents GCD profiles of the AC//CoNi-LDH 2 HSC, from which one can obtain gravimetric capacities of 281.2−171.5 C g −1 at 1−10 A g −1 (61% retention) (Figure 4i).…”

Section: Resultsmentioning

confidence: 99%

Oriented Nanosheet-Assembled CoNi-LDH Cages with Efficient Ion Diffusion for Quasi-Solid-State Hybrid Supercapacitors

Guo

et al. 2021

Inorg. Chem.

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Fast-charged energy-storage technologies have become important nowadays as they are required by many applications, including automobiles. This inspires the exploitation of hybrid supercapacitors (HSCs) with the advantages of fast charge offered by the capacitor characters and high energy density from the property of battery technology. The challenges lay in the construction of advanced materials with high pseudocapacitive activity. Herein, a metal–organic framework derivative is utilized to address the problems. Specifically, polyhedral CoNi layered double hydroxide (CoNi-LDH x ) cages assembled in the form of nanosheet arrays are prepared from ZIF-67 using a facile ion-exchange approach. Based on the control over the mass ratio of ZIF-67 to Ni salt, the optimal CoNi-LDH2 is attained. It exhibits ultrahigh capacities ranging from 1031.4 to 667.3 C g–1 under 1–25 A g–1, thanks to rich Faradaic active spots and the accelerated kinetics provided by the synergy between nanosheet arrays and the hollow structure. The CoNi-LDH2-based HSC with the gel electrolyte shares remarkable energy output of 49 Wh kg–1 and approving cyclability with almost no capacity decay after 12 000 cycles. This is an advancement vs many related studies and can arouse tremendous interests of researchers in solving the main problems of energy storage.

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Section: Resultsmentioning

confidence: 99%

Oriented Nanosheet-Assembled CoNi-LDH Cages with Efficient Ion Diffusion for Quasi-Solid-State Hybrid Supercapacitors

Guo

et al. 2021

Inorg. Chem.

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“…Metal–organic frameworks (MOFs) are ordered porous materials fabricated by the self-assembly of inorganic metal clusters and organic ligand linkers. Recently, due to their features of controllable structure, adjustable chemical composition, inherent porosity, and high surface areas, MOFs have been broadly employed as appropriate templates to construct advanced nanomaterials for energy conversion and storage. − Through rational and controllable synthesis strategies, MOFs can be simply converted into the desired nanoporous materials. − MOF-derived materials can deliver ideal electrochemical performances when the parental morphological features are retained, since the collapse of the MOF precursors usually breaks the porous structure. Most pioneering works have been reported with MOF-derived materials such as carbon materials and transition metal-based oxides/hydroxides/sulfides/phosphides/selenides. − For example, Yamauchi et al prepared cobalt tetroxide and nanoporous carbon through ZIF-67 by optimizing the pyrolysis process, which displayed a high capacitance of 272 C g –1 and a capacity of 504 C g –1 at a scan rate of 5 mV s –1 , respectively .…”

Section: Introductionmentioning

confidence: 99%

Conversion of Amorphous MOF Microspheres into a Nickel Phosphate Battery-Type Electrode Using the “Anticollapse” Two-Step Strategy

et al. 2021

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Metal–organic frameworks (MOFs) have attracted great attention as templates for preparation of functional porous materials owing to their adjustable structures, rich porosity, and controllable components. However, collapsed templates during the conversion process hinder their application and synthesis of derivatives. In this study, we demonstrate a novel two-step etching strategy during which amorphous MOF microspheres are initially transformed into nickel hydroxide and then subsequently transformed into microspherical nickel phosphates. Through this strategy, the prepared nickel phosphates maintain the microspherical morphology of MOFs but with no MOF residuals, exhibiting ultrahigh specific surface area, uniform pore size, and good structural robustness. Examined as a supercapacitor electrode, they show an outstanding specific capacity of 820 C g–1 at 0.5 A g–1 and remarkable cycling stability of 88% capacity retention after 10 000 cycles. Moreover, an asymmetric supercapacitor constructed utilizing reduced graphene cross-linked with p-phenylenediamine oxide (PPD-rGO) as the cathode displays a preeminent energy density of 64.56 Wh kg–1 at a power density of 507 W kg–1. This strategy has important significance in guiding the preparation of high-performance MOF-derived electrodes.

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“…After the incorporation of Mo or W, both Ni 2p 3/2 and Co 2p 3/2 peaks shift to higher binding energies compared with those for NiCoP, demonstrating that the strong interaction at the heterointerface causes a charge redistribution. Moreover, the conversion of Ni 3+ to Ni 2+ and Co 2+ to Co 3+ indicates a charge transfer from Co ions to Ni ions due to the incorporation of high-valence Mo or W elements [38]. For the P 2p spectrum of Ni-Co-Mo-P nanoarrays, two peaks located at 134.9 and 130.3 eV can be ascribed to oxidized phosphides on the surface (P-O) and metal-P bond, respectively [39].…”

Section: Resultsmentioning

confidence: 99%

Optimizing nanostructure and constructing heterostructure via Mo/W incorporation to improve electrochemical properties of NiCoP for hybrid supercapacitors

et al. 2022

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Transition metal phosphides (TMPs) are promising battery-type electrodes for hybrid supercapacitors (HSCs) due to their high electrical conductivity and electrochemical activity. Constructing TMPs with fast kinetics and stable structure is requisite to realize high-performance HSCs but remains a challenge. Herein, we incorporate Mo (or W) into NiCoP to form Ni-Co-Mo-P (or Ni-Co-W-P) heterostructures with a unique three-dimensional (3D) open morphology and modified electronic structure. Electrochemical analyses and density functional theory (DFT) calculations reveal that the incorporation of Mo/W enables NiCoP with optimized nanostructure, high conductivity, abundant reaction active sites and enhanced reaction kinetics. As a result, the designed Ni-Co-Mo-P heterostructure delivers a high areal capacity of 4.08 C cm −2 (703 C g −1 ) at 2 mA cm −2 and 3.25 C cm −2 at 30 mA cm −2 with a good cycling stability, superior to those of NiCoP and Ni-Co-W-P counterparts. The practical feasibility of the Ni-Co-Mo-P heterostructure is further demonstrated by an energy conversion and storage system consisting of commercial solar cell and Ni-Co-Mo-P// activated carbon (AC) device, which could obtain a high energy density of 53.3 W h kg −1 at a power density of 800 W kg −1 . All-solid-state Ni-Co-Mo-P//AC device further illustrates the superior flexibility and makes a strong candidate for wearable energy storage electronics.

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Design and Fabrication of Hierarchical NiCoP–MOF Heterostructure with Enhanced Pseudocapacitive Properties

Abstract: The data that supports the findings of this study are available in the Supporting Information of this article.

Cited by 125 publications

References 71 publications

Oriented Nanosheet-Assembled CoNi-LDH Cages with Efficient Ion Diffusion for Quasi-Solid-State Hybrid Supercapacitors

Oriented Nanosheet-Assembled CoNi-LDH Cages with Efficient Ion Diffusion for Quasi-Solid-State Hybrid Supercapacitors

Conversion of Amorphous MOF Microspheres into a Nickel Phosphate Battery-Type Electrode Using the “Anticollapse” Two-Step Strategy

Optimizing nanostructure and constructing heterostructure via Mo/W incorporation to improve electrochemical properties of NiCoP for hybrid supercapacitors

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