Polyhedral‐Like NiMn‐Layered Double Hydroxide/Porous Carbon as Electrode for Enhanced Electrochemical Performance Supercapacitors

Yu, Mei; Liu, Ruili; Liu, Jianhua; Li, Songmei; Ma, Yuhong

doi:10.1002/smll.201702616

Cited by 157 publications

(65 citation statements)

References 60 publications

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“…As the power density increases to 6286 W kg −1 , the energy density still can be retained to a value of 22 Wh kg −1 . These energy and power density values compare favorably with most of the recently reported LDH supercapacitors, such as NiAl‐LDH/rGO//Active carbon (15.42 Wh kg −1 at 230 W kg −1 ), NiMn‐LDHs/PC‐1//Active carbon (18.6 Wh kg −1 at 225.03 W kg −1 ), Co x Ni 1− x ‐LDH/CN x @NGHSs (28.9 Wh kg −1 at 1875 W kg −1 ), NiCo‐LDH (41.46 Wh kg −1 at 212.68 W kg −1 ), NiCo‐LDH/NG (31.2 Wh kg −1 at 354 W kg −1 ), CoMn‐LDH//AC (5.9 Wh kg −1 at 1000 W kg −1 ), and CoNiFe‐LDH/CNFs (30.2 W h kg −1 at 800 W kg −1 ),10a shown in Figure f.…”

Section: Resultssupporting

confidence: 79%

Significant Role of Al in Ternary Layered Double Hydroxides for Enhancing Electrochemical Performance of Flexible Asymmetric Supercapacitor

Gao

Liu

et al. 2019

Adv Funct Materials

270

139

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The Al effect on the electrochemical properties of layered double hydroxides (LDHs) is not properly probed, although it is demonstrated to notably promote the capacitive behavior of LDHs. Herein, ternary NiCo 2 Al x layered double hydroxides with varying levels of Al stoichiometry are purposely developed, grown directly on mechanically flexible and electrically conducting carbon cloth (CC@NiCo 2 Al x -LDH). Al plays a significant role in determining the structure, morphology, and electrochemical behavior of NiCo 2 Al x -LDHs. At an increasing level of Al in NiCo 2 Al x -LDHs, there is a steady evolution from 1D nanowire to 2D nanosheets. The CC@NiCo 2 Al-LDH at an appropriate level of Al and with the nanowire-nanosheet mixed morphology exhibits both significantly enhanced electrochemical performance and excellent structural stability, with about a 2.3-fold capacitance of NiCo 2 -OH. When applied as the anode in a flexible asymmetric supercapacitor (ASC), the CC@NiCo 2 Al-LDH gives rise to a remarkable energy density of 44 Wh kg −1 at the power density of 462 W kg −1 , together with remarkable cyclic stability with 91.2% capacitance retention over 15 000 charge-discharge cycles. The present study demonstrates a new pathway to significantly improve the electrochemical performance and stability of transition metal LDHs, which are otherwise unstable in structure and poorly performing in both rate and cycling capability.

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Section: Resultssupporting

confidence: 79%

Significant Role of Al in Ternary Layered Double Hydroxides for Enhancing Electrochemical Performance of Flexible Asymmetric Supercapacitor

Gao

Liu

et al. 2019

Adv Funct Materials

270

139

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“…By virtue of large surface area and the sophisticated structural design, the UNML exposes more active sites and available space, which are beneficial to the diffusion of electrolyte ions and the kinetics of reaction, ultimately improved the electrochemical performance. [38,39] The top left inset of Figure 3d and Figure 3e show the pore size distribution curves, indicating a mean pore size of 10-20 nm and about 3.2 nm for NML and UNML. It can be predicted that NML-0.1 and NML-0.5 have lower porosity than UNML, which is confirmed by further exploration, as shown in Figure S3a-b.…”

Section: Resultsmentioning

confidence: 99%

One‐Step Synthesis of Ultrathin NiMn Layered Double Hydroxide Nanosheets for Supercapacitors

et al. 2019

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With the help of ethylenediamine (EN), we built through hydrothermal synthesis a multiple‐level NiMn layered double hydroxide nanostructure consisting of ultrathin nanosheets (UNML) with plenty buffer spaces. Such porous structure provides more active sites, shortens the diffusion path of electrolyte ions, and creates massive “live volume” to ensure structural integrity during long‐term cycling. The UNML possesses high specific capacitance (1513 F g−1 at 1 A g−1). Moreover, the hybrid supercapacitor employing UNML and AC as positive and negative electrode delivers enhanced energy density up to 59 Wh kg−1 at a power density of 808 W kg−1 and robust cycling stability with capacitance degradation of 8.7 % after 5000 cycles. This simple strategy is expected to cope with the prevalent issues facing battery‐type electrode materials, ensuring improvement of the overall electrochemical performance.

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“…For example, Yu et al reported the synthesis and capacitive behavior of NiMn LDH/PC composites. [122] PC derived from the calcination of zeolitic imidazolate frameworks-8 (ZIF-8 MOF) possesses ah igh level of porosity and retains the originalm orphology. NiMn LDH nanosheets crosslinked to each other uniformly cover the framework of PC, througha ni ns itu growth method.…”

Section: Carbon Nanoparticles (Cnps)mentioning

confidence: 99%

Recent Progress in Two‐Dimensional Layered Double Hydroxides and Their Derivatives for Supercapacitors

et al. 2020

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High‐performance supercapacitors have attracted great attention due to their high power, fast charging/discharging, long lifetime, and high safety. However, the generally low energy density and overall device performance of supercapacitors limit their applications. In recent years, the design of rational electrode materials has proven to be an effective pathway to improve the capacitive performances of supercapacitors. Layered double hydroxides (LDHs), have shown great potential in new‐generation supercapacitors, due to their unique two‐dimensional layered structures with a high surface area and tunable composition of the host layers and intercalation species. Herein, recent progress in LDH‐based, LDH‐derived, and composite‐type electrode materials targeted for applications in supercapacitors, by tuning the chemical/metal composition, growth morphology, architectures, and device integration, is reviewed. The complicated relationships between the composition, morphology, structure, and capacitive performance are presented. A brief projection is given for the challenges and perspectives of LDHs for energy research.

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Polyhedral‐Like NiMn‐Layered Double Hydroxide/Porous Carbon as Electrode for Enhanced Electrochemical Performance Supercapacitors

Cited by 157 publications

References 60 publications

Significant Role of Al in Ternary Layered Double Hydroxides for Enhancing Electrochemical Performance of Flexible Asymmetric Supercapacitor

Significant Role of Al in Ternary Layered Double Hydroxides for Enhancing Electrochemical Performance of Flexible Asymmetric Supercapacitor

One‐Step Synthesis of Ultrathin NiMn Layered Double Hydroxide Nanosheets for Supercapacitors

Recent Progress in Two‐Dimensional Layered Double Hydroxides and Their Derivatives for Supercapacitors

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