Honeycomb-like NiMoO4 ultrathin nanosheet arrays for high-performance electrochemical energy storage

Xiao, Kang; Xia, Lu; Liu, Guoxue; Wang, Suqing; Ding, Liang-Xin; Wang, Haihui

doi:10.1039/C5TA00258C

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Honeycomb-like NiMoO4 ultrathin nanosheet arrays for high-performance electrochemical energy storage

Author(s): Kang Xiao ¹ ^, ² ^, ³ ^, ⁴ , Lu Xia ¹ ^, ² ^, ³ ^, ⁴ , Guoxue Liu ¹ ^, ² ^, ³ ^, ⁴ , Suqing Wang ¹ ^, ² ^, ³ ^, ⁴ , Liang-Xin Ding ¹ ^, ² ^, ³ ^, ⁴ , Haihui Wang ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵

Publication date (Electronic): 2015

Journal: Journal of Materials Chemistry A

Publisher: Royal Society of Chemistry (RSC)

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Abstract

Honeycomb-like NiMoO ₄ ultrathin nanosheet arrays as an attractive electrode material are reported for high-performance supercapacitors and Li-ion batteries.

Abstract

Supercapacitors and Li-ion batteries are two types of electrical energy storage devices. To satisfy the increasing demand for high-performance energy storage devices, traditional electrode materials, such as transition metal oxides, conducting polymers and carbon-based materials, have been widely explored. However, the results obtained to date remain unsatisfactory, and the development of inexpensive electrode materials (especially for commercial manufacturing) with superior electrochemical performance for use in supercapacitors and in Li-ion batteries is still needed. The as-prepared NiMoO ₄ nanosheets (NSs) with interconnecting nanoscale pore channels and an ultrathin structure provide a large electrochemical active area, which facilitates electrolyte immersion and ion transport and provides effective pathways for electron transport. Therefore, the as-prepared NiMoO ₄ NS electrode exhibits a high specific capacity and an excellent rate capability and cycling stability in supercapacitors and in Li-ion batteries. Moreover, a high energy density (43.5 W h kg ⁻¹ at 500 W kg ⁻¹) was obtained for the symmetric supercapacitor (SSC) composed of two sections of NiMoO ₄ NSs.

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Ultrahigh-power micrometre-sized supercapacitors based on onion-like carbon.

David Pech, Magali Brunet, Hugo Durou … (2010)

Electrochemical capacitors, also called supercapacitors, store energy in two closely spaced layers with opposing charges, and are used to power hybrid electric vehicles, portable electronic equipment and other devices. By offering fast charging and discharging rates, and the ability to sustain millions of cycles, electrochemical capacitors bridge the gap between batteries, which offer high energy densities but are slow, and conventional electrolytic capacitors, which are fast but have low energy densities. Here, we demonstrate microsupercapacitors with powers per volume that are comparable to electrolytic capacitors, capacitances that are four orders of magnitude higher, and energies per volume that are an order of magnitude higher. We also measured discharge rates of up to 200 V s(-1), which is three orders of magnitude higher than conventional supercapacitors. The microsupercapacitors are produced by the electrophoretic deposition of a several-micrometre-thick layer of nanostructured carbon onions with diameters of 6-7 nm. Integration of these nanoparticles in a microdevice with a high surface-to-volume ratio, without the use of organic binders and polymer separators, improves performance because of the ease with which ions can access the active material. Increasing the energy density and discharge rates of supercapacitors will enable them to compete with batteries and conventional electrolytic capacitors in a number of applications.

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Ni(OH)2 Nanoplates Grown on Graphene as Advanced Electrochemical Pseudocapacitor Materials

Hailiang Wang, Hernan Sanchez Casalongue, Hongjie Dai … (2010)

Ni(OH)2 nanocrystals grown on graphene sheets with various degrees of oxidation are investigated as electrochemical pseudocapacitor materials for potential energy storage applications. Single-crystalline Ni(OH)2 hexagonal nanoplates directly grown on lightly-oxidized, electrically-conducting graphene sheets (GS) exhibit a high specific capacitance of ~1335F/g at a charge and discharge current density of 2.8A/g and ~953F/g at 45.7A/g with excellent cycling ability. The high specific capacitance and remarkable rate capability are promising for applications in supercapacitors with both high energy and power densities. Simple physical mixture of pre-synthesized Ni(OH)2 nanoplates and graphene sheets show lower specific capacitance, highlighting the importance of direct growth of nanomaterials on graphene to impart intimate interactions and efficient charge transport between the active nanomaterials and the conducting graphene network. Single-crystalline Ni(OH)2 nanoplates directly grown on graphene sheets also significantly outperform small Ni(OH)2 nanoparticles grown on heavily-oxidized, electrically-insulating graphite oxide (GO), suggesting that the electrochemical performance of these composites are dependent on the quality of graphene substrates and the morphology and crystallinity of the nanomaterials grown on top. These results suggest the importance of rational design and synthesis of graphene-based nanocomposite materials for high-performance energy applications.