Great improvement in pseudocapacitor properties of nickel hydroxide via simple gold deposition

Kim, Sun‐I; Thiyagarajan, Pradheep; Jang, Ji‐Hyun

doi:10.1039/c4nr02204a

Cited by 61 publications

(33 citation statements)

References 38 publications

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“…However measuring or calculating the mass of Ni(OH) 2 on graphene or RGO sheets was complex [30]. Jang and co-workers improved the cycling stability of 3D Ni(OH) 2 nanomaterials from 30% to 80% by depositing gold nanoparticles onto 3D Ni(OH) 2 surfaces [31]. However, as we all know, the introduction of Au nanoparticles can increase the cost.…”

Section: Introductionmentioning

confidence: 98%

Cycling stability of ultrafine β-Ni(OH)2 nanosheets for high capacity energy storage device via a multilayer nickel foam electrode

Mao

Guo

et al. 2016

Electrochimica Acta

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Keywords:b-Ni(OH) 2 nanosheets hybrid supercapacitor multilayer nickel foam A B S T R A C T Ultrafine b-Ni(OH) 2 nanosheets with an average diameter of about 14.5 nm have been fabricated by immersing Na(HCO 3 ) 2 nanoparticles into 6 M KOH solution. The multilayer nickel foam system was introduced to improve the cycling stability of ultrafine b-Ni(OH) 2 nanosheets without using acetylene black. The results demonstrated that the specific discharge capacity of the b-Ni(OH) 2 electrode was up to 524.5C g À1 at 5 A g À1 and retained 83.8% after 1000 cycles, which was better than those of other b-Ni (OH) 2 electrodes obtained using acetylene black as conductors (retained 59.1% after 1000 cycles). Even after 5000 cycles, the specific capacity also maintained 80.8%. In addition, a hybrid supercapacitor was successfully fabricated based on ultrafine b-Ni(OH) 2 nanosheets and active carbon, the corresponding energy density and power density at 0.1 A g À1 were calculated to be 20.45 Wh kg À1 and 75 W kg À1 , respectively. What's more, the hybrid supercapacitor could light up a set of low-voltage light-emitting diodes.

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Section: Introductionmentioning

confidence: 98%

Cycling stability of ultrafine β-Ni(OH)2 nanosheets for high capacity energy storage device via a multilayer nickel foam electrode

Mao

Guo

et al. 2016

Electrochimica Acta

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“…To evaluate the pseudocapacitive properties of the NP Au/VA Ni(OH) 2 films, electrochemical measurements are carried out in a three-electrode cell with a Ag/AgCl reference electrode and a Pt counter electrode in 1 M KOH aqueous electrolyte.Fig. Even the scan rate increases by enhanced transports of electrons and ions in this hybrid electrode 23,26,54,59. 3b and Fig.…”

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confidence: 80%

Single-crystalline Ni(OH)₂nanosheets vertically aligned on a three-dimensional nanoporous metal for high-performance asymmetric supercapacitors

et al. 2015

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Transition-metal hydroxides (TMHOs) or oxides (TMOs) with layered crystalline structures are attractive electrode materials for high-density charge storage in electrochemical supercapacitors. However, their randomly stacked nanostructures on conductive reinforcements, typically carbon materials, exhibit only modest enhancement of rate capability because of poor electron and ion transports that are limited by highly anisotropic conductivity, excessive grain boundaries and weak TMHO or TMO/C interfaces. Here we report a hybrid electrode design to tackle all three of these problems in layered Ni(OH) 2 for high-performance asymmetric supercapacitors, wherein the single-crystalline Ni(OH) 2 nanosheets are vertically aligned on three-dimensional bicontinuous nanoporous gold skeleton with epitaxial Au/Ni(OH) 2 interfaces (NP Au/VA Ni(OH) 2 ). As a result of the unique nanoarchitecture, the pseudocapacitive behavior of Ni(OH) 2 is dramatically enhanced for ensuring a volumetric 2 capacitance as high as ~2911 F cm -3 (∼ ∼ ∼ ∼2416 F g -1 for the constituent Ni(OH) 2 ) in the NP Au/VA Ni(OH) 2 electrode with excellent rate capability. Asymmetric supercapacitors assembled with this NP Au/VA Ni(OH) 2 electrode and the activated carbon have a high gravimetric energy of 31.4 Wh kg -1 delivered at an exceptionally high power density of 100 kW kg -1 with excellent cycling stability.200 times (from 5 to 1000 mV s -1 ), the anodic (E O ) and cathodic (E R ) peaks only shift to 0.494 and 0.188 V, respectively, from 0.344 and 0.269 V at 5 mV s -1 (Fig. 3a). The difference between E O and E R (∆E p = E O -E R ) for NP Au/VA Ni(OH) 2 electrode is much lower than these for both NP Au/RA Ni(OH) 2 and CFP/VA Ni(OH) 2 electrodes at various scan rates ranging from 5 to 1000 mV s -1 (Fig. S6), implying an excellent rate capability and reversibility of VA Ni(OH) 2 supported by NP Au due to the 13 retains ~81% (116 F g -1 ) at a high scan rate of 500 mV s -1 , demonstrating an excellent rate capability due to the pseudocapacitive and capacitive contributions of both NP Au/VA Ni(OH) 2 and AC electrodes. This feature is also observed in the representative galvanostatic charge/discharge measurements of ASC device with linear and nonlinear voltage stages at different current densities (Figs. 4c,d). The slightly low Coulombic efficiency (CE) at low current densities is probably due to the occurrence of OER at high potential range. 60 While the current density increases to 12.5 A g -1 , the CE reaches ~90%, enabling this ASC device to deliver high levels of electric power. The specific energy and power of the NP Au/VA Ni(OH) 2 //AC ASC device are plotted in the Ragone plot (Fig. 4e). This ASC device has a maximum energy density of 52.3Wh kg -1 at low powers, and can maintain 31.4 Wh kg -1 at an exceptionally high power of 100.0 kW kg -1 , which is about sevenfold higher than those of other typical Ni(OH) 2 -based ASC devices with the similar energy densities reported previously: graphite/amorphous Ni(OH) 2 //AC, 23 Ni foam/CNT/Ni(OH) 2 //AC, 24 Ni f...

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“…Although accumulation of negative charges generated by PICS in WO 3 has been reported, positive charge accumulation has not yet been proved. Since ohmic contact is formed at the Au‐Ni(OH) 2 interface (Figure b), smooth charge transfer to Ni(OH) 2 is expected. In addition, Ni(OH) 2 is reported to be an electrocatalyst for oxygen evolution from water without noble metal co‐catalysts …”

Section: Introductionmentioning

confidence: 99%

Visible‐Light‐Driven Plasmonic Photocatalysis Enhanced by Charge Accumulation

2019

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Plasmon‐induced charge separation (PICS) at the interface between a plasmonic material and semiconductor is employed to drive photocatalytic reactions for conversion and storage of solar energy. Most of the conventional photoelectrodes based on PICS have an n‐M type structure with an interface between n‐type semiconductor (typically TiO2) and plasmonic metal (typically Au) nanoparticles. Here we develop n‐M‐p type photoelectrodes by coating the TiO2/Au photoelectrode with Ni(OH)2 or CrOx, which can collect and store positive charges. Both of the photoelectrodes show efficient PICS under visible light and accumulate positive charges released from resonant Au nanoparticles. The accumulated charges can be used for oxidation of organic species such as ethanol in the dark. The TiO2/AuNP/Ni(OH)2 photoelectrode exhibits an oxygen evolution ability under visible light with a certain bias voltage.

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Great improvement in pseudocapacitor properties of nickel hydroxide via simple gold deposition

Cited by 61 publications

References 38 publications

Cycling stability of ultrafine β-Ni(OH)2 nanosheets for high capacity energy storage device via a multilayer nickel foam electrode

Cycling stability of ultrafine β-Ni(OH)2 nanosheets for high capacity energy storage device via a multilayer nickel foam electrode

Single-crystalline Ni(OH)₂nanosheets vertically aligned on a three-dimensional nanoporous metal for high-performance asymmetric supercapacitors

Visible‐Light‐Driven Plasmonic Photocatalysis Enhanced by Charge Accumulation

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Great improvement in pseudocapacitor properties of nickel hydroxide via simple gold deposition

Cited by 61 publications

References 38 publications

Cycling stability of ultrafine β-Ni(OH)2 nanosheets for high capacity energy storage device via a multilayer nickel foam electrode

Cycling stability of ultrafine β-Ni(OH)2 nanosheets for high capacity energy storage device via a multilayer nickel foam electrode

Single-crystalline Ni(OH)2nanosheets vertically aligned on a three-dimensional nanoporous metal for high-performance asymmetric supercapacitors

Visible‐Light‐Driven Plasmonic Photocatalysis Enhanced by Charge Accumulation

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Single-crystalline Ni(OH)₂nanosheets vertically aligned on a three-dimensional nanoporous metal for high-performance asymmetric supercapacitors