Controllable Growth of CNTs on Graphene as High-Performance Electrode Material for Supercapacitors

Yang, Zhiyu; Zhao, Yufei; Xiao, Qingqing; Zhang, Yuxia; Jing, Lin; Yan, Yi‐Ming; Sun, Kening

doi:10.1021/am501362g

Cited by 79 publications

(34 citation statements)

References 35 publications

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“…20a). [240][241][242] Dai and co-workers prepared a VA-CNT-graphene hybrid by the intercalated growth of VA-CNTs into thermally expanded highly ordered pyrolytic graphite (Fig. 20b).…”

Section: D Nanostructures Based On Carbon Materialsmentioning

confidence: 99%

Supercapacitor electrode materials: nanostructures from 0 to 3 dimensions

Tetard

Zhai

et al. 2015

Energy Environ. Sci.

2,283

1,039

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The ever-growing global demand of energy together with the depletion of fossil fuels makes it critical to develop sustainable and renewable energy resources. Developing relevant energy storage systems (e.g. batteries and supercapacitors) is essential to utilizing sustainable and renewable energy resources. A supercapacitor is highly beneficial in storing renewable energy. For example, when light is not shining or wind is not blowing, the energy needs to be stored in devices like batteries and supercapacitors. Among the efforts of building efficient supercapacitors, electrode materials with rational nanostructured designs have offered major improvements in performance over the past several years. This review article is intended to examine recent progress in nanostructuring supercapacitor electrode materials, highlighting the fundamental understanding of the relationship between structural properties and electrochemical performances, as well as an outlook on the next generation of nanostructured supercapacitor electrodes design. REVIEW This journal isSupercapacitors have drawn considerable attention in recent years due to their high specific power, long cycle life, and ability to bridge the power/energy gap between conventional capacitors and batteries/fuel cells. Nanostructured electrode materials have demonstrated superior electrochemical properties in producing high-performance supercapacitors. In this review article, we describe the recent progress and advances in designing nanostructured supercapacitor electrode materials based on various dimensions ranging from zero to three. We highlight the effect of nanostructures on the properties of supercapacitors including specific capacitance, rate capability and cycle stability, which may serve as a guideline for the next generation of supercapacitor electrode design.

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“…20a). [240][241][242] Dai and co-workers prepared a VA-CNT-graphene hybrid by the intercalated growth of VA-CNTs into thermally expanded highly ordered pyrolytic graphite (Fig. 20b).…”

Section: D Nanostructures Based On Carbon Materialsmentioning

confidence: 99%

Supercapacitor electrode materials: nanostructures from 0 to 3 dimensions

Tetard

Zhai

et al. 2015

Energy Environ. Sci.

2,283

1,039

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“…However, they suffer from irreversible sheet-to-sheet restacking due to the strong interlayer van der Waals force under drying and heat treatment processes, resulting in a limit of the accessibility to electrolyte ions and largely hindering the full utilization of their surfaces and active sites 29 30 . Recently, a facile strategy to reduce agglomeration of reduced graphene oxide (RGO) sheets for improving their electrochemical performance is to introduce interlayer ‘spacers’, including nanoparticles 10 , nanotubes/nanowires 31 32 and nanosheets 33 among the graphene layers.…”

mentioning

confidence: 99%

Synergistic Effect between Ultra-Small Nickel Hydroxide Nanoparticles and Reduced Graphene Oxide sheets for the Application in High-Performance Asymmetric Supercapacitor

Liu

Wang

Yan

2015

Sci Rep

113

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Nanoscale electrode materials including metal oxide nanoparticles and two-dimensional graphene have been employed for designing supercapacitors. However, inevitable agglomeration of nanoparticles and layers stacking of graphene largely hamper their practical applications. Here we demonstrate an efficient co-ordination and synergistic effect between ultra-small Ni(OH)2 nanoparticles and reduced graphene oxide (RGO) sheets for synthesizing ideal electrode materials. On one hand, to make the ultra-small Ni(OH)2 nanoparticles work at full capacity as an ideal pseudocapacitive material, RGO sheets are employed as an suitable substrate to anchor these nanoparticles against agglomeration. As a consequence, an ultrahigh specific capacitance of 1717 F g−1 at 0.5 A g−1 is achieved. On the other hand, to further facilitate ion transfer within RGO sheets as an ideal electrical double layer capacitor material, the ultra-small Ni(OH)2 nanoparticles are introduced among RGO sheets as the recyclable sacrificial spacer to prevent the stacking. The resulting RGO sheets exhibit superior rate capability with a high capacitance of 182 F g−1 at 100 A g−1. On this basis, an asymmetric supercapacitor is assembled using the two materials, delivering a superior energy density of 75 Wh kg−1 and an ultrahigh power density of 40 000 W kg−1.

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“…In reality, due to the impedance of the electrolyte, most electrode materials do not meet this value, resulting in CV curve deviation. The ΔE values for the PDMS−CNTs sponge@MnO 2 electrode are larger than 59 mV at high scan rates, the electrode process becomes quasi−reversible . GCD curve is a supplementary method at a constant current to measure the capacitance of supercapacitors.…”

Section: Resultsmentioning

confidence: 99%

Hierarchical Structure MnO₂ Coated PDMS−Carbon Nanotube Sponge as Flexible Electrode for Electrocatalytic Water Splitting and High Performance Supercapacitor

et al. 2019

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As a typical transition metal oxide, MnO2 has great potential in catalysis and energy storage, but its poor conductivity greatly limits its performance. PDMS−carbon nanotube sponges have excellent electrical conductivity and flexibility. Herein, according to the principle of complementary, we propose a novel hierarchical PDMS−carbon nanotube sponge@MnO2 electrode with uniform size and morphology. In view of the structural preponderances and multifunctional of the materials, the PDMS−carbon nanotube sponge@MnO2 has been investigated as the binder−free electrode materials for both supercapacitors and electrocatalysis applications. PDMS−carbon nanotube sponge@MnO2 electrode exhibits an admirable HER property with a low onset potential of 112 mV at −30 mA cm−2, a minimal overpotential (η=258 mV), a small Tafel slope (71 mV dec−1), large anodic currents and stability for 20 h in 0.1 M H2SO4 solution. Moreover, as supercapacitor electrode, the PDMS−carbon nanotube sponge@MnO2 electrode achieves a specific mass capacitance reaching 124.7 mF cm−2 at 1 A cm−2 and good flexibility, which are better than those ternary transition metal oxides. The assembled asymmetric device with the PDMS−carbon nanotube sponge@MnO2 and CNTs respectively as positive and negative electrode has a large window voltage of 1.4 V, and thus acquires an expected specific mass capacitance (422 mF cm−3 at the current density of 1 A cm−3) and an outstanding higher energy density of 15.3 W h kg−1 (at 371 W kg−1).

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Controllable Growth of CNTs on Graphene as High-Performance Electrode Material for Supercapacitors

Cited by 79 publications

References 35 publications

Supercapacitor electrode materials: nanostructures from 0 to 3 dimensions

Supercapacitor electrode materials: nanostructures from 0 to 3 dimensions

Synergistic Effect between Ultra-Small Nickel Hydroxide Nanoparticles and Reduced Graphene Oxide sheets for the Application in High-Performance Asymmetric Supercapacitor

Hierarchical Structure MnO₂ Coated PDMS−Carbon Nanotube Sponge as Flexible Electrode for Electrocatalytic Water Splitting and High Performance Supercapacitor

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Controllable Growth of CNTs on Graphene as High-Performance Electrode Material for Supercapacitors

Cited by 79 publications

References 35 publications

Supercapacitor electrode materials: nanostructures from 0 to 3 dimensions

Supercapacitor electrode materials: nanostructures from 0 to 3 dimensions

Synergistic Effect between Ultra-Small Nickel Hydroxide Nanoparticles and Reduced Graphene Oxide sheets for the Application in High-Performance Asymmetric Supercapacitor

Hierarchical Structure MnO2 Coated PDMS−Carbon Nanotube Sponge as Flexible Electrode for Electrocatalytic Water Splitting and High Performance Supercapacitor

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Hierarchical Structure MnO₂ Coated PDMS−Carbon Nanotube Sponge as Flexible Electrode for Electrocatalytic Water Splitting and High Performance Supercapacitor