Ni-Co layered double hydroxide with self-assembled urchin like morphology for asymmetric supercapacitors

Hou, Liyin; Du, Qinghua; Su, Li; Di, Shuanlong; Ma, Zhipeng; Chen, Ling; Shao, Guangjie

doi:10.1016/j.matlet.2018.11.123

Cited by 53 publications

(16 citation statements)

References 6 publications

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“…The self-organization of 2D nanostructures (e.g., nanosheets, nanoplates, nanoflakes) into hierarchical 3D structures (e.g., flower-like, urchin-like, starlike, etc .) has been frequently observed in various inorganic materials, such as metal oxides, , phosphates, , sulfides, , phosphides, , and hydroxides. , In addition, the self-assembly of 0D nanostructures, such as nanocrystals or nanoparticles into one-dimensional (1D) nanoarchitectures, such as supertubes and superlattice chains, has previously been achieved by solvent-induced association of clusters and confined assembly, respectively. , In contrast, the self-assembly of 2D nanostructures into 1D architectures is rarely reported due to the difficulty in confining the growth of 2D nanostructures in one particular direction. Such self-assembled structures may not only inherit the uniqueness of 2D nanostructures but also the excellent charge transport of 1D nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

“…has been frequently observed in various inorganic materials, such as metal oxides, 2,3 phosphates, 4,5 sulfides, 6,7 phosphides, 8,9 and hydroxides. 10,11 In addition, the self-assembly of 0D nanostructures, such as nanocrystals or nanoparticles into one-dimensional (1D) nanoarchitectures, such as supertubes and superlattice chains, has previously been achieved by solvent-induced association of clusters and confined assembly, respectively. 12,13 In contrast, the self-assembly of 2D nanostructures into 1D architectures is rarely reported due to the difficulty in confining the growth of 2D nanostructures in one particular direction.…”

Section: Introductionmentioning

confidence: 99%

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Self-Assembly of Two-Dimensional Bimetallic Nickel–Cobalt Phosphate Nanoplates into One-Dimensional Porous Chainlike Architecture for Efficient Oxygen Evolution Reaction

et al. 2020

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The self-assembly of two-dimensional (2D) nanostructures into one-dimensional (1D) nanoarchitectures may result in materials which combine the unique physicochemical properties of 2D nanostructures with the excellent charge transport properties of 1D architectures. Herein, we report the self-stacking of 2D nickel−cobalt (Ni−Co) phosphate nanoplates into 1D chainlike architectures with the assistance of metal glycerates as self-templates. This unique selfassembly process is driven by the adsorbed ethyl glycerate on the surface of the individual nanoplates, which promotes the subsequent growth of the new nanoplate on top of the previously formed nanoplate, thereby leading to the self-stacking of these nanoplates along the vertical direction. The flexibility of the proposed method is also highlighted by the feasible preparation of nickel phosphate with the same self-assembled structure. When tested as a catalyst for oxygen evolution reaction (OER) in an alkaline medium, the bimetallic Ni−Co phosphate (derived from Ni-Co-TEP) with the nanoplate-assembled chainlike structure displays much lower overpotential (η 10 = 310 mV) and Tafel slope (68 mV dec −1 ) than its pristine counterparts. The enhanced OER activity of this bimetallic catalyst may be attributed to (i) the highly interconnected structure and the bimetallic composition which promote improved charge transport; (ii) the porous chainlike structure which provides increased number of active sites, facilitates easier electrolyte infiltration, and promotes good electrical contact with the electrolyte, and (iii) the presence of Ni 3+ and Co 3+ active sites (nickel−cobalt (oxy)hydroxides) which can promote the chemisorption of OH − and facilitate electron transfer from the OH − to the surface Ni/Co sites during OER.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Self-Assembly of Two-Dimensional Bimetallic Nickel–Cobalt Phosphate Nanoplates into One-Dimensional Porous Chainlike Architecture for Efficient Oxygen Evolution Reaction

et al. 2020

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“…Among the wide variety of possible metal compositions to give rise to an LDH phase, the best results reported in energy storage applications as supercapacitors are found for the Co‐based ones . Furthermore, synthetic parameters like particle size, morphology, thickness and hybridization with conductive materials have been comprehensively studied in different LDHs with the aim of improving the electrochemical performance towards energy storage applications . Regarding the supercapacitive behavior, the intercalation of dodecyl sulfate allows an enhancement of 22 % in the specific capacitance of a CoAl−LDH .…”

Section: Introductionmentioning

confidence: 99%

Boosting the Supercapacitive Behavior of CoAl Layered Double Hydroxides via Tuning the Metal Composition and Interlayer Space

Silva

Sanchis‐Gual

Carrasco

et al. 2020

Batteries & Supercaps

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Layered double hydroxides (LDHs) are promising supercapacitor materials due to their wide chemical versatility, earth abundant metals and high specific capacitances. Many parameters influencing the supercapacitive performance have been studied such as the chemical composition, the synthetic approaches, and the interlayer anion. However, no systematic studies about the effect of the basal space have been carried out. Here, two‐dimensional (2D) CoAl‐LDHs were synthesized through anion exchange reactions using surfactant molecules in order to increase the interlayer space (ranging from 7.5 to 32.0 Å). These compounds exhibit similar size and dimensions but different basal space to explore exclusively the interlayer distance influence in the supercapacitive performance. In this line, Co : Al ratios of 2 : 1, 3 : 1 and 4 : 1 were explored. In all cases, an enhancement of the specific capacitance was observed by increasing the basal space, reaching ca. 50 % more than the value obtained from the less‐spaced 2 : 1 CoAl‐LDH (going from ca. 750 to 1100 F.g−1 at 1 A.g−1). This increment mainly occurs because of the increase in the electrochemical surface area (up to ca. 260 %) and the higher electrolyte diffusion. Interestingly, the best performance is achieved for the lowest Co : Al ratio (i. e. the highest Al content) revealing the important role of the electrochemically inert Al in the structure.

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“…The resulting Nyquist plots exhibit a semicircle at high frequency region followed by a straight line at low frequency region. The semicircle is associated with the resistance of charge transfer ( R ct ) over the interface between electrolyte and electrode material, 38 whereas a straight line demonstrating resistance of ionic transport, known as the Warburg diffusion line. 39 An equivalent circuit is used to fit the obtained results as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

A simple strategy to prepare a layer-by-layer assembled composite of Ni–Co LDHs on polypyrrole/rGO for a high specific capacitance supercapacitor

et al. 2019

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A facile and novel electrode material of nickel-cobalt layered double hydroxides (Ni-Co LDHs) layered on polypyrrole/reduced graphene oxide (PPy/rGO) is fabricated for a symmetrical supercapacitor via chemical polymerization, hydrothermal and vacuum filtration. This conscientiously layered composition is free from any binder or surfactants which is highly favorable for supercapacitors. The PPy/rGO serves as an ideal backbone for Ni-Co LDHs to form a free-standing electrode for a high-performance supercapacitor and enhanced the overall structural stability of the film. The well-designed layered nanostructures and high electrochemical activity from the hexagonal-flakes like Ni-Co LDHs provide large electroactive sites for the charge storage process. The specific capacitance (1018 F g À1 at 10 mV s À1 ) and specific energy (46.5 W h kg À1 at 464.9 W kg À1 ) obtained for the PPy/rGO|Ni-Co LDHs symmetrical electrode in the current study are the best reported for the two-electrode system for PPy-and LDHs-based composites.The outstanding performance in the prepared LBL film is a result of the LBL architecture of the film and the combined effect of redox reaction and electrical double layer capacitance.

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Ni-Co layered double hydroxide with self-assembled urchin like morphology for asymmetric supercapacitors

Cited by 53 publications

References 6 publications

Self-Assembly of Two-Dimensional Bimetallic Nickel–Cobalt Phosphate Nanoplates into One-Dimensional Porous Chainlike Architecture for Efficient Oxygen Evolution Reaction

Self-Assembly of Two-Dimensional Bimetallic Nickel–Cobalt Phosphate Nanoplates into One-Dimensional Porous Chainlike Architecture for Efficient Oxygen Evolution Reaction

Boosting the Supercapacitive Behavior of CoAl Layered Double Hydroxides via Tuning the Metal Composition and Interlayer Space

A simple strategy to prepare a layer-by-layer assembled composite of Ni–Co LDHs on polypyrrole/rGO for a high specific capacitance supercapacitor

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