Layered double hydroxides with larger interlayer distance for enhanced pseudocapacitance

Xiao, Yuanhua; Su, Dangcheng; Wang, Xuezhao; Wu, Shao-Yi; Zhou, Liming; Fang, Shaoming; Li, Feng

doi:10.1007/s40843-017-9138-1

Cited by 44 publications

(19 citation statements)

References 42 publications

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“…The SEM results show that the morphology of the Co-adsorbed LDH is mostly an anomalistic lamellar structure with a coarse surface, that is poriferous and of a seaweed-like structure, and therefore it is different from the original LDH. Furthermore, the inter-lamellar spacing distance is sensitive to the structure variations between amorphous and crystalline LDH, which are also usually regarded as criteria for the cation adsorption capacity [ 21 , 22 ]. Consequently, the crystal structure evolution of CaAl-Cl-LDH before and after cobalt adsorption, including the phases, boundaries of the grains, and the domains, are investigated in Figure 4 using a high-resolution transmission electron microscope (HR-TEM).…”

Section: Resultsmentioning

confidence: 99%

Crystalline/Amorphous Blend Identification from Cobalt Adsorption by Layered Double Hydroxides

et al. 2018

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In this study, the adsorption behavior of CaAl-Cl layered double hydroxide (CaAl-Cl-LDH) with a controlled pH value (pH = 6) on Co(II) ions ([Co] = 8 mM) is investigated. The comprehensively accepted mechanism of cobalt adsorption on LDH is considered to be co-precipitation, and the final adsorbed products are normally crystalline Co-LDH. One unanticipated finding is that crystalline/amorphous blends are found in the X-ray diffraction (XRD) pattern of Co-adsorbed LDH. To shed light on the adsorption products and the mechanisms in the adsorption process of Co(II) in an aqueous solution by CaAl-Cl-LDH, a series of testing methods including Fourier-transform infrared spectroscopy (FT-IR), Scanning electron microscope (SEM), High-resolution transmission electron microscopy (HR-TEM), X-ray photoelectron spectroscopy (XPS), and inductively coupled plasma (ICP) are applied to clarify the interaction between cobalt and CaAl-Cl-LDH. According to the comprehensive analysis, the formation of the crystalline/amorphous blends corresponds to two adsorption mechanisms. The crystalline phases are identified as Co6Al2CO3(OH)16·4H2O, which is attributed to the co-precipitation process occurring in the interaction between Co(II) and CaAl-Cl-LDH. The formation of the amorphous phases is due to surface complexation on amorphous Al(OH)3 hydrolyzed from CaAl-Cl-LDH.

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Section: Resultsmentioning

confidence: 99%

Crystalline/Amorphous Blend Identification from Cobalt Adsorption by Layered Double Hydroxides

et al. 2018

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“…Many studies on LDHs have shown that replacing the original interlayer anions with an organic anionic surfactant has a positive effect on the increase of the interlayer spacing. [ 28,64,65 ] For a dual charge storage mechanism integrated with surface redox, ion intercalation is an effective strategy for the chemical modification of LDH‐based supercapacitors. Lin et al [ 28 ] synthesized NiCo‐LDH nanosheets with large interlayer spacing via the intrinsic pillar effect of sodium dodecylbenzene sulfonate (NiCo‐SDBS‐LDH), as shown in Figure 5c.…”

Section: Chemical Modification Of Ldhsmentioning

confidence: 99%

Chemical Modifications of Layered Double Hydroxides in the Supercapacitor

Jing

Dong

Zhang

2020

Energy & Environ Materials

203

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“…Doping or partially substituting with other metal ions, such as Mg [21,22], Al [23][24][25][26], Mn [27], Fe [4], Co [28][29][30][31][32] or Zn [33] in α-Ni(OH) 2 has found to be an effective way to stabilize the crystal structure; the resulting complex nickel hydroxides have demonstrated much improved electrochemical properties and performance when used as electrodes in supercapacitors. For example, α-phase NiCoMn hydroxide demonstrated high power densities and high energy [34], CoAl hydroxide possessed enhanced electrochemical performance [35,36]. Among these metal ions, Mg is an alkaline-earth metals with smaller atomic weight.…”

Section: Introductionmentioning

confidence: 99%

α- and β-Phase Ni-Mg Hydroxide for High Performance Hybrid Supercapacitors

et al. 2019

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Mg-substituted α- and β-phase nickel hydroxides with high specific capacitance and good stability have been synthesized via sacrificial metal-based replacement reaction. 2D α- and β-phase nickel-magnesium hydroxide (NiMg-OH) have been synthesized by sacrificing magnesium (Mg) powder with nickel salt aqueous solutions. Interestingly, the phase of the obtained NiMg-OH can be controlled by adjusting the nickel precursor. As well, the Mg powder is used not only as Mg source but also alkali source to form NiMg-OH. The α-phase nickel-magnesium hydroxide sample (α-NiMg-OH) exhibits lager surface area of 290.88 m2 g–1. The electrochemical performances show that the α-NiMg-OH presented a superior specific capacitance of 2602 F g–1 (1 A g–1) and β-phase nickel-magnesium hydroxide sample (β-NiMg-OH) exhibits better stability with 87% retention after 1000 cycles at 10 A g–1. The hybrid supercapacitor composed of α-NiMg-OH and activated carbon (AC) display high storage performance and cycle stability, it presents 89.7 F g–1 (1 A g–1) and of 0–1.6 V potential window and it maintains capacitance retention of 84.6% subsequent to 4000 cycles.

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Layered double hydroxides with larger interlayer distance for enhanced pseudocapacitance

Abstract: The interlayer space of the layered materials is not always the electrochemical active area for contributing to the pseudocapacitive process.

Cited by 44 publications

References 42 publications

Crystalline/Amorphous Blend Identification from Cobalt Adsorption by Layered Double Hydroxides

Crystalline/Amorphous Blend Identification from Cobalt Adsorption by Layered Double Hydroxides

Chemical Modifications of Layered Double Hydroxides in the Supercapacitor

α- and β-Phase Ni-Mg Hydroxide for High Performance Hybrid Supercapacitors

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