Synthesis and remarkable capacitive performance of reduced graphene oxide/silver/nickel-cobalt sulfide ternary nanocomposites

Cai, Xiaoqing; Shen, Xiaoping; Ji, Zhenyuan; Sheng, Xuexi; Kong, Lirong; Yuan, Aihua

doi:10.1016/j.cej.2016.09.059

Cited by 54 publications

(18 citation statements)

References 50 publications

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“…Compared with the Raman of rGO in Figure S2, there is no significant difference of D band and G band between rGO and Mn 0.1 Ni 0.9 MoO 4 /rGO. Moreover, the intensity ratio of D and G is more than 1, indicating the increased degree of reduction of GO . Nevertheless, comparison between the Raman spectrum of Mn 0.1 Ni 0.9 MoO 4 /rGO and that of NiMoO 4 shows a red-shift occurs for almost all peaks, which may be ascribed to the defects resulting from the transition metal Mn-doping as well as the chemical/electrostatic interaction between Mn 0.1 Ni 0.9 MoO 4 and rGO. − …”

Section: Resultsmentioning

confidence: 95%

Mn-Doped NiMoO₄ Mesoporous Nanorods/Reduced Graphene Oxide Composite for High-Performance All-Solid-State Supercapacitor

Yuan

Yao

Jiang

et al. 2020

ACS Appl. Energy Mater.

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Mn-doping has great influence on the structural and electrical properties of NiMoO 4 , which plays an important role in determining its electrochemical activities. In this work, Mn-doped NiMoO 4 was prepared. Structural characterization and theoretical calculation reveal that Mn-doped NiMoO 4 (Mn 0.1 Ni 0.9 MoO 4 ) has smaller unit cell parameters and is more reactive than NiMoO 4 because of the defects produced by Mn-doping. On the basis of that, we prepared a composite consisting of Mn 0.1 Ni 0.9 MoO 4 mesoporous nanorods and reduced graphene oxide (Mn 0.1 Ni 0.9 MoO 4 /rGO), which was assembled into a symmetrical all-solidstate device as electrode material, with alkaline poly(vinyl alcohol) as solid-state electrolyte. The device shows a good specific capacitance of 109.3 F•g −1 at 1 A•g −1 in a rather wide voltage range of 0−1.8 V, exhibits an excellent cycling stability with 96.1% of the capacitance retained after 200 cycles, and delivers a high energy density of 49.2 Wh•kg −1 at 1800 W•kg −1 . The all-solid-state supercapacitor owns superior flexibility and maintains 83.6% of its initial specific capacitance under the bent condition. When tested in a three-electrode system, the Mn 0.1 Ni 0.9 MoO 4 /rGO composite exhibits a maximum specific capacitance of 688.9 F•g −1 at 0.5 A•g −1 that is much better than NiMoO 4 and Mn 0.1 Ni 0.9 MoO 4 . The results show that the Mn 0.1 Ni 0.9 MoO 4 /rGO composite stands out as a kind of transition-metal-doped electrode material for flexible all-solid-state supercapacitors.

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Section: Resultsmentioning

confidence: 95%

Mn-Doped NiMoO₄ Mesoporous Nanorods/Reduced Graphene Oxide Composite for High-Performance All-Solid-State Supercapacitor

Yuan

Yao

Jiang

et al. 2020

ACS Appl. Energy Mater.

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“…In the phase angle versus frequency plot, the phase angle of 90° in the low frequency suggests the ideal capacitive behavior of the electrode, and the phase angle of 0° indicated the pure resistance behavior. 80,81 The knee frequency ( f o ) is the frequency at the phase angle of 45°, and in this frequency, the capacitive and resistive impedance are equal. In Figure 9c, the higher f o value of (CoNi D ) 60 RGO 40 compared to CoNi S and CoNi D indicates the high rate capability of this nanocomposite.…”

Section: Resultsmentioning

confidence: 99%

A “One-Pot” Route for the Synthesis of Snowflake-like Dendritic CoNi Alloy-Reduced Graphene Oxide-Based Multifunctional Nanocomposites: An Efficient Magnetically Separable Versatile Catalyst and Electrode Material for High-Performance Supercapacitors

et al. 2019

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In this paper, a simple “one pot” methodology to synthesize snowflake-like dendritic CoNi alloy-reduced graphene oxide (RGO) nanocomposites has been reported. First-principles quantum mechanical calculations based on density functional theory (DFT) have been conducted to understand the electronic structures and properties of the interface between Co, Ni, and graphene. Detailed investigations have been conducted to evaluate the performance of CoNi alloy and CoNi-RGO nanocomposites for two different types of applications: (i) as the catalyst for the reduction reaction of 4-nitrophenol and Knoevenagel condensation reaction and (ii) as the active electrode material in the supercapacitor applications. Here, the influence of microstructures of CoNi alloy particles (spherical vs snowflake-like dendritic) and the effect of immobilization of CoNi alloy on the surface of RGO on the performance of CoNi-RGO nanocomposites have been demonstrated. CoNi alloy having a snowflake-like dendritic microstructure exhibited better performance than that of spherical CoNi alloy, and CoNi-RGO nanocomposites showed improved properties compared to CoNi alloy. The kapp value of the (CoNiD)60RGO40-catalyzed reduction reaction of 4-nitrophenol is 20.55 × 10–3 s–1, which is comparable and, in some cases, superior to many RGO-based catalysts. The (CoNiD)60RGO40-catalyzed Knoevenagel condensation reaction showed the % yield of the products in the range of 80–93%. (CoNiD)60RGO40 showed a specific capacitance of 501 F g–1 (at 6 A g–1), 21.08 Wh kg–1 energy density at a power density of 1650 W kg–1, and a retention of ∼85% of capacitance after 4000 cycles. These results indicate that (CoNiD)60RGO40 could be considered as a promising electrode material for high-performance supercapacitors. The synergistic effect, derived from the hierarchical structure of CoNiD-RGO nanocomposites, is the origin for its superior performance. The easy synthetic methodology, high catalytic efficiency, and excellent supercapacitance performance make (CoNiD)60RGO40 an appealing multifunctional material.

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“…[50,51] To tackle the low electrical conductivity from pseudocapacitive materials such as metal oxides, either producing highly conductive and porous graphene materials prior to hybridization or further introducing conductors hybridization/heteroatoms doping to the pseudocapacitance hybridized graphene electrodes or both would be beneficial to achieve high capacitance without sacrificing the conductivity. [40,52,53]…”

Section: Pseudocapacitance Hybridization To Improve Capacitancementioning

confidence: 99%

Hybridized Graphene for Supercapacitors: Beyond the Limitation of Pure Graphene

Zhang

Yang

Lau

et al. 2021

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105

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Graphene‐based supercapacitors have been attracting growing attention due to the predicted intrinsic high surface area, high electron mobility, and many other excellent properties of pristine graphene. However, experimentally, the state‐of‐the‐art graphene electrodes face limitations such as low surface area, low electrical conductivity, and low capacitance, which greatly limit their electrochemical performances for supercapacitor applications. To tackle these issues, hybridizing graphene with other species (e.g., atom, cluster, nanostructure, etc.) to enlarge the surface area, enhance the electrical conductivity, and improve capacitance behaviors are strongly desired. In this review, different hybridization principles (spacers hybridization, conductors hybridization, heteroatoms doping, and pseudocapacitance hybridization) are discussed to provide fundamental guidance for hybridization approaches to solve these challenges. Recent progress in hybridized graphene for supercapacitors guided by the above principles are thereafter summarized, pushing the performance of hybridized graphene electrodes beyond the limitation of pure graphene materials. In addition, the current challenges of energy storage using hybridized graphene and their future directions are discussed.

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Synthesis and remarkable capacitive performance of reduced graphene oxide/silver/nickel-cobalt sulfide ternary nanocomposites

Cited by 54 publications

References 50 publications

Mn-Doped NiMoO₄ Mesoporous Nanorods/Reduced Graphene Oxide Composite for High-Performance All-Solid-State Supercapacitor

Mn-Doped NiMoO₄ Mesoporous Nanorods/Reduced Graphene Oxide Composite for High-Performance All-Solid-State Supercapacitor

A “One-Pot” Route for the Synthesis of Snowflake-like Dendritic CoNi Alloy-Reduced Graphene Oxide-Based Multifunctional Nanocomposites: An Efficient Magnetically Separable Versatile Catalyst and Electrode Material for High-Performance Supercapacitors

Hybridized Graphene for Supercapacitors: Beyond the Limitation of Pure Graphene

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Synthesis and remarkable capacitive performance of reduced graphene oxide/silver/nickel-cobalt sulfide ternary nanocomposites

Cited by 54 publications

References 50 publications

Mn-Doped NiMoO4 Mesoporous Nanorods/Reduced Graphene Oxide Composite for High-Performance All-Solid-State Supercapacitor

Mn-Doped NiMoO4 Mesoporous Nanorods/Reduced Graphene Oxide Composite for High-Performance All-Solid-State Supercapacitor

A “One-Pot” Route for the Synthesis of Snowflake-like Dendritic CoNi Alloy-Reduced Graphene Oxide-Based Multifunctional Nanocomposites: An Efficient Magnetically Separable Versatile Catalyst and Electrode Material for High-Performance Supercapacitors

Hybridized Graphene for Supercapacitors: Beyond the Limitation of Pure Graphene

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Mn-Doped NiMoO₄ Mesoporous Nanorods/Reduced Graphene Oxide Composite for High-Performance All-Solid-State Supercapacitor

Mn-Doped NiMoO₄ Mesoporous Nanorods/Reduced Graphene Oxide Composite for High-Performance All-Solid-State Supercapacitor