Cr2O3 nanoparticles: a fascinating electrode material combining both surface-controlled and diffusion-limited redox reactions for aqueous supercapacitors

Li, Tianli; Liu, Zaichun; Zhu, Li; Dai, Fang; Hu, Lu; Zhang, Lei; Wen, Zubiao; Wu, Yuping

doi:10.1007/s10853-018-2743-0

Cited by 26 publications

(4 citation statements)

References 37 publications

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“…Figure A compares CV curves of each positive and negative electrode in a KOH-containing three-electrode system. The CV curve of the rGO shows a box-like shape without any noticeable redox peaks, which is the characteristic of an EDLC with a specific capacitance of 328 F g –1 at a scan rate of 20 mV s –1 . To obtain the optimal performance, the charge balance for the supercapacitor device follows eq , q + = q − where q + and q – refer to the charges stored at the positive and negative electrodes, respectively.…”

Section: Resultsmentioning

confidence: 91%

Nickel Cobalt LDH/Graphene Film on Nickel-Foam-Supported Ternary Transition Metal Oxides for Supercapacitor Applications

et al. 2023

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Layered double hydroxides (LDHs) of transition metals have attained significant attention for supercapacitor applications due to their excellent charge storage, low internal resistance, and superior electrochemical stability. Here, a nanocomposite of reduced graphene oxide/nickel cobalt layered double hydroxide (rGO/NiCo LDH) on the surface of nickel foam (NF) containing hierarchical nickel cobalt copper transition metal oxides (TMOs) is prepared through two-step processes of electrochemical and coprecipitation methods. The TMOs/rGO/NiCo LDH nanocomposite is characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR), Raman, X-ray energy-dispersive (EDS), and X-ray photoelectron (XPS) spectroscopies as well as by transmission electron microscopy (TEM), field-emission scanning electron microscopy (FE-SEM), elemental mapping analysis, nitrogen adsorption/desorption, and contact angle measurements. The supercapacitive behavior of the electrodes has been investigated through cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) measurements, and electrochemical impedance spectroscopy (EIS). The study has shown that the synergetic effect and the electrochemical properties have considerably improved when the layered double hydroxides are synthesized in the presence of rGO. The TMOs/rGO/NiCo LDH nanocomposite exhibits an excellent specific capacitance of 2763 F g–1 at a current density of 1 A g–1 and a stability of 85% after 3000 GCD cycles at a current density of 24 A g–1. Also, a TMOs/rGO/NiCo LDH//rGO asymmetric supercapacitor device is constructed with an aqueous KOH electrolyte, which shows a capacitance of 244 F g–1 at a current density of 1 A g–1. The device attains the highest energy density of 34 Wh kg–1 and power density of 2500 W kg–1, with an excellent cycling stability of 100% after 3000 GCD cycles at a current density of 10 A g–1.

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Section: Resultsmentioning

confidence: 91%

Nickel Cobalt LDH/Graphene Film on Nickel-Foam-Supported Ternary Transition Metal Oxides for Supercapacitor Applications

et al. 2023

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“…It is well known that there are three basic energy storage mechanisms and they are regulated by the b value: the diffusion‐controlled Li‐ion storage (or faradaic contribution), the capacitive‐determined charge‐transfer processes with surface layers (or non‐faradaic contribution) and pseudocapacitive effect [39] . In general, b value ≈0.5 indicates that the electrode process is dictated by the diffusion‐controlled process, while the value ≈1.0 stands for the capacitive process [40] . According to Figure 5c the b values of anodic and cathodic peaks for U‐RGO/TiO 2 are 0.65 and 0.75, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…[39] In general, b value � 0.5 indicates that the electrode process is dictated by the diffusioncontrolled process, while the value � 1.0 stands for the capacitive process. [40] According to Figure 5c the b values of anodic and cathodic peaks for U-RGO/TiO 2 are 0.65 and 0.75, respectively. That means that the synergistic pseudocapacitive effect dominates in the electrode.…”

Section: Chemelectrochemmentioning

confidence: 88%

Towards Promotion of Graphene/Titania‐Based Electrode via Ultrafast and Self‐Expansion Reduction for Li‐ion Battery

et al. 2023

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In this study, a facile strategy to promote electrochemical performance of free-standing Li-ion battery electrode composed of titanium dioxide (TiO 2 ) via composite formation with reduced graphene oxide (RGO) using ultrafast and selfexpansion reduction reaction (USER) was proposed. This approach induced self-expansion through rapid heating providing abundance of cavities/empty spaces to alleviate volume change during charge/discharge process resulting in boosted storage and conversion response of the system (765 mAh g À 1 at 0.05 A g À 1 ) and accelerated Coulombic efficiency. Detailed electrochemical, microscopic and structural analyses (ex-situ) of the film prove that this internal expansion delivers enhanced ionic diffusion and shielding material from volume changes during charge/discharge process. Therefore, we believe that this simple and very fast strategy offers a venue to overcome one of the main bottleneck in promotion of electrochemical performance of other active materials which are sensitive to volume expansion during lithiation/delithiation process.

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“…Metal oxides have attracted the attention of the scientific community as ideal candidates for manufacturing supercapacitors, because of their abundance, low cost, and several oxidation/reduction reactions that they can go through during the storage process . Among the various metal oxides used so far, Cr 2 O 3 has been widely studied and has shown very good performance to be used as an active material. − However, in most reports, the process of synthesis of Cr 2 O 3 demands CrOOH as a precursor. , Here we report the generation of ultrasmall nanoparticles of chromium oxide (CrOOH) by a simple, fast, and facile hydrothermal approach utilizing ascorbic acid (first time utilized for CrOOH synthesis) as a reducing agent for the reduction of chromium nitrate (Cr(NO 3 ) 3 × 9H 2 O), which is more economical, energy, and significantly time saving in comparison to the earlier reports of Cr 2 O 3 particles. The reduced graphene oxide (rGO) was synthesized using modified Hummer’s method followed by reduction with ascorbic acid (C 6 H 8 O 6 ); further, various composites of rGO and CrOOH were formed in different proportions and utilized as electrode materials for supercapacitor devices.…”

Section: Introductionmentioning

confidence: 97%

Facile Synthesis and Optimization of CrOOH/rGO-Based Electrode Material for a Highly Efficient Supercapacitor Device

et al. 2022

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New electrode materials for supercapacitor devices are the primary focus of current research into energy-storage devices. Besides, exact control of the proportions of these new materials while forming electrodes for coin cell supercapacitor devices is very important for the large-scale manufacturing or at industrial scale. Here we report a facile synthesis of CrOOH with ascorbic acid and explore an exact composition with reduced graphene oxide to achieve a highly efficient electrode material for supercapacitor devices. The rGO is synthesized by modified Hummer's method followed by reduction with ascorbic acid, whereas ultrasmall CrOOH nanoparticles result via hydrothermal treatment of the reactants Cr(NO 3 ) 3 , NaOH, and ascorbic acid at 120 °C for 12 h. The ultrasmall CrOOH nanoparticles show an amorphous phase with particle size range 3−10 nm and a calculated band gap of 3.28 eV. Six different composites are prepared by varying the proportion of CrOOH and rGO materials and further utilized as active electrode materials for fabrication of the coin cell supercapacitor devices. We report the highest specific capacitance for the 70% CrOOH and 30% rGO composite that exhibits a capacitance of 199.8 mF cm −2 with a long cyclic stability up to the tested 10,000 charge/discharge cycles. The proposed supercapacitor device exhibits a high energy and power density of 8.26 Wh kg −1 and 3756.9 W kg −1 , respectively, at Ragone Plot, showing the commercial viability of the device.

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Cr2O3 nanoparticles: a fascinating electrode material combining both surface-controlled and diffusion-limited redox reactions for aqueous supercapacitors

Cited by 26 publications

References 37 publications

Nickel Cobalt LDH/Graphene Film on Nickel-Foam-Supported Ternary Transition Metal Oxides for Supercapacitor Applications

Nickel Cobalt LDH/Graphene Film on Nickel-Foam-Supported Ternary Transition Metal Oxides for Supercapacitor Applications

Towards Promotion of Graphene/Titania‐Based Electrode via Ultrafast and Self‐Expansion Reduction for Li‐ion Battery

Facile Synthesis and Optimization of CrOOH/rGO-Based Electrode Material for a Highly Efficient Supercapacitor Device

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