Recent Progress in Some Amorphous Materials for Supercapacitors

Li, Qing; Xu, Yuxia; Zheng, Shasha; Guo, Xiaotian; Xue, Huaiguo; Pang, Huan

doi:10.1002/smll.201800426

Cited by 154 publications

(93 citation statements)

References 157 publications

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“…LIBs/SIBs and supercapacitors (SCs) have their respective advantages and disadvantages. Batteries have high energy density but with low power density, and SCs have the reverse properties . Although numerous research focused on the SCs devices based on the aqueous electrolyte, their working voltage is limited to the potential of water decomposition .…”

Section: Nb2o5 Electrodesmentioning

confidence: 99%

Niobium‐Based Oxides Toward Advanced Electrochemical Energy Storage: Recent Advances and Challenges

Deng

Zhu

et al. 2019

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146

115

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Niobium‐based oxides including Nb2O5, TiNbxO2+2.5x compounds, M–Nb–O (M = Cr, Ga, Fe, Zr, Mg, etc.) family, etc., as the unique structural merit (e.g., quasi‐2D network for Li‐ion incorporation, open and stable Wadsley– Roth shear crystal structure), are of great interest for applications in energy storage systems such as Li/Na‐ion batteries and hybrid supercapacitors. Most of these Nb‐based oxides show high operating voltage (>1.0 V vs Li+/Li) that can suppress the formation of solid electrolyte interface film and lithium dendrites, ensuring the safety of working batteries. Outstanding rate capability is impressive, which can be derived from their fast intercalation pseudocapacitive kinetics. However, the intrinsic poor electrical conductivity hinders their energy storage applications. Various strategies including structure optimization, surface engineering, and carbon modification are effectively used to overcome the issues. This review provides a comprehensive summary on the latest progress of Nb‐based oxides for advanced electrochemical energy storage applications. Major impactful work is outlined, promising research directions, and various performance‐optimizing strategies, as well as the energy storage mechanisms investigated by combining theoretical calculations and various electrochemical characterization techniques. In addition, challenges and perspectives for future research and commercial applications are also presented.

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Section: Nb2o5 Electrodesmentioning

confidence: 99%

Niobium‐Based Oxides Toward Advanced Electrochemical Energy Storage: Recent Advances and Challenges

Deng

Zhu

et al. 2019

Small

146

115

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“…It is also important to note that amorphous or low‐crystalline materials were reported to have better electrochemical performance than their crystalline materials . The reason may be based on the nature of amorphous materials as follows: (i) the metastable structure and long‐range disordered atomic arrangement of amorphous materials lead to abundant defects and oxygen vacancies to intensify the diffusion and reaction of electrolyte ions; (ii) the short‐range order of amorphous materials facilitates the transformation of surface groups into active sites during electrochemical reaction; (iii) the more accessible pathway offered by the amorphous state for charges intercalating and de‐intercalating to facilitate electron transfer affords enhanced electronic conductivity; (iv) the nice flexibility of amorphous materials owing to the isotropic strain and stress during charging and discharging yields outstanding electrochemical stability …”

Section: Introductionmentioning

confidence: 99%

Amorphous CoFe Double Hydroxides Decorated with N‐Doped CNTs for Efficient Electrochemical Oxygen Evolution

Liu

et al. 2019

ChemSusChem

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The development and design of a highly active and affordable nanostructured material as an efficient electrocatalyst for electrochemical oxygen evolution is a pressing necessity to realize industrial production of hydrogen by water electrolysis. Amorphous nanocomposites have recently attracted interest owing to their superior electrocatalytic activity derived from their unique structure. Herein, amorphous CoFe double hydroxides (Am‐CFDH) decorated with N‐doped carbon nanotubes (NCNTs) is synthesized by a facile and simple one‐pot approach under room temperature. Through electrochemical measurement, the bare Am‐CFDH nanocomposite already exhibits a comparable oxygen evolution reaction (OER) activity to the commercial IrO2 catalyst on account of its amorphous nature and the interaction between Co and Fe. The introduced NCNTs can provide better electrical conductivity, more anchoring sites, and functional groups for enhancing the transfer of electrons and reactants, preventing the agglomeration of Am‐CFDH to expose more active sites, and improving the synergistic effect between Am‐CFDH and NCNTs. Thus, the Am‐CFDH/NCNTs hybrid displays favorable durability beyond 20 h and advanced OER activity, owning a small overpotential of 270 mV at 10 mA cm−2 and a low Tafel slope of 56.88 mV dec−1 in alkaline medium.

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“…Thus, the XRD studies have confirmed the complexation of GO as rGO localized in the ZAP matrix. The conformation envelope of ZAPG2 yielded a smaller crystallite size of 32.2 nm than ZAP (69.2 nm) (Debye–Scherrer relation), paving the way for the improved electrochemical performance of ZAPG2 compared to that of the pure ZAP …”

Section: Resultsmentioning

confidence: 99%

Microwave Synthesis of Zinc Ammonium Phosphate/Reduced Graphene Oxide Hybrid Composite for High Energy Density Supercapacitors

Raja

Vickraman

Simon

et al. 2019

Physica Status Solidi (a)

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Herein, zinc ammonium phosphate (ZAP) is interluded with reduced graphene oxide (rGO) as a composite (ZAPG2) via microwave synthesis route. The ZAPG2 is investigated by X‐ray diffraction (XRD), Raman, scanning electron microscopy (SEM), X‐ray photoelectron spectroscopy (XPS), and electrochemical studies (cyclic voltammetry, galvanostatic charge discharge, and impedance). The Raman analysis confirms the graphitization of rGO in the ZAP, and XPS confirms the elemental composition. The SEM morphology reveals that rGO spreads over the micropyramidal envelope of ZAP. The ZAPG2//rGO device delivers a higher specific capacitance of 356 F g−1 for 5 m than in 3 m H2SO4 (133.7 F g−1) electrolyte at a current density of 1 A g−1 within the potential window of 1.8 V. The cyclic stability of 86.1% for 3 m and 66.6% for 5 m are noted for 5000 charge–discharge cycles. ZAPG2//rGO combination is the first attempt at facilitating better specific capacitances on device performance. This parallels in energy density, as 59.9 W h kg−1 in 3 m and 153.4 W h kg−1 in 5 m driving for the same power density of 448.3 W kg−1 at 1 A g−1, which suggests the hybrid composite device's practicality for high‐energy supercapacitor applications.

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Recent Progress in Some Amorphous Materials for Supercapacitors

Cited by 154 publications

References 157 publications

Niobium‐Based Oxides Toward Advanced Electrochemical Energy Storage: Recent Advances and Challenges

Niobium‐Based Oxides Toward Advanced Electrochemical Energy Storage: Recent Advances and Challenges

Amorphous CoFe Double Hydroxides Decorated with N‐Doped CNTs for Efficient Electrochemical Oxygen Evolution

Microwave Synthesis of Zinc Ammonium Phosphate/Reduced Graphene Oxide Hybrid Composite for High Energy Density Supercapacitors

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