Capacitance decay of nanoporous nickel hydroxide

Hu, Guo‐Xiong; Li, Chunxiang; Gong, Hao

doi:10.1016/j.jpowsour.2010.03.093

Cited by 157 publications

(98 citation statements)

References 24 publications

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“…This enhancement may be attributed to the high surface area, high electrical conductivity, good flexibility and light weight of the low defect density graphene sheets. As mentioned earlier, the decrease in capacitance of Ni(OH) 2 is mainly due to the phase transformation and microstructural changes during electrochemical cycling [6]. Actually, we indeed find the as-prepared α-Ni(OH) 2 has transformed into the β-phase (JPCDS 14-0117) after electrochemical cycling (the XRD pattern of the product after 2000 cycles is shown in Fig.…”

Section: Nanosheets Increases From Less Than One Micrometer (Figs 2(supporting

confidence: 77%

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Fabrication of a low defect density graphene-nickel hydroxide nanosheet hybrid with enhanced electrochemical performance

et al. 2011

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The development of efficient energy storage devices with high capacity and excellent stability is a demanding necessary to satisfy future societal and environmental needs. A hybrid material composed of low defect density graphene-supported Ni(OH) 2 sheets has been fabricated via a soft chemistry route and investigated as an advanced electrochemical pseudocapacitor material. The low defect density graphene effectively prevents the restacking of Ni(OH) 2 nanosheets as well as boosting the conductivity of the hybrid electrodes, giving a dramatic rise in capacity performance of the overall system. Moreover, graphene simultaneously acts as both nucleation center and template for the in situ growth of smooth and large scale Ni(OH) 2 nanosheets. By virtue of the unique two-dimensional nanostructure of graphene, the as-obtained Ni(OH) 2 sheets are closely protected by graphene, effectively suppressing their microstructural degradation during the charge and discharge processes, enabling an enhancement in cycling capability. Electrochemical measurements demonstrated that the specific capacitance of the as-obtained composite is high as 1162.7 F/g at a scan rate of 5 mV/s and 1087.9 F/g at a current density of 1.5 A/g. In addition, there was no marked decrease in capacitance at a current density of 10 A/g after 2000 cycles, suggesting excellent long-term cycling stability.

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Section: Nanosheets Increases From Less Than One Micrometer (Figs 2(supporting

confidence: 77%

“…Moreover, the pseudocapacitive reactions during charge and discharge process enable Ni(OH) 2 films to have a higher specific capacitance than traditional supercapacitor electrode materials such as RuO 2 [6]. Nevertheless, the exploitation of the electrochemical properties of this material faces key scientific and technological challenges.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a low defect density graphene-nickel hydroxide nanosheet hybrid with enhanced electrochemical performance

et al. 2011

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“…4(f). The specific capacitance showed a decrease after the initial 100 cycles (retaining 97% of its initial capacitance), which can be attributed to pulverization and wettability issues [54]. Subsequent cycling actually caused an increase in the capacitance up to 1600 cycles.…”

Section: Asymmetric Electrochemical Capacitormentioning

confidence: 96%

Graphene-nickel cobaltite nanocomposite asymmetrical supercapacitor with commercial level mass loading

et al. 2012

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A high performance asymmetric electrochemical supercapacitor with a mass loading of 10 mg·cm -2 on each planar electrode has been fabricated by using a graphene-nickel cobaltite nanocomposite (GNCC) as a positive electrode and commercial activated carbon (AC) as a negative electrode. Due to the rich number of faradaic reactions on the nickel cobaltite, the GNCC positive electrode shows significantly higher capacitance (618 F·g -1 ) than graphene-Co 3 O 4 (340 F•g -1 ) and graphene-NiO (375 F•g -1 ) nanocomposites synthesized under identical conditions. More importantly, graphene greatly enhances the conductivity of nickel cobaltite and allows the positive electrode to charge/discharge at scan rates similar to commercial AC negative electrodes. This improves both the energy density and power density of the asymmetric cell. The asymmetric cell composed of 10 mg GNCC and 30 mg AC displayed an energy density in the range of 19.5 Wh•kg -1 with an operational voltage of 1.4 V. At high sweep rate, the system is capable of delivering an energy density of 7.6 Wh•kg -1 at a power density of about 5600 W•kg -1 . Cycling results demonstrate that the capacitance of the cell increases to 116% of the original value after the first 1600 cycles due to a progressive activation of the electrode, and maintains 102% of the initial value after 10000 cycles.

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“…temperature, but with a capacitance retention of 62 % after only 2000 CD cycles at 1 A/g [11]. It has been reported in the same study that the major contributor to such capacitance decay is the phase transformation from a-Ni(OH) 2 or c-NiOOH to b-Ni(OH) 2 or b-NiOOH phases, at relatively low discharge current densities [11].…”

Section: Electrode Prepared By Chemical Bath Deposition (Cbd) On Nickmentioning

confidence: 81%

Ternary Ni–Cu–OH and Ni–Co–OH electrodes for electrochemical energy storage

Alhebshi

Alshareef

2015

Mater Renew Sustain Energy

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In this project, Ni-Cu-OH and Ni-Co-OH ternary electrodes have been prepared. Different Ni:Cu and Ni:Co ratios were deposited by chemical bath deposition (CBD) at room temperature on carbon microfibers. Since Ni(OH) 2 is notorious for poor cycling stability, the goal of the work was to determine if doping with Cu or Co could improve Ni(OH) 2 cycling stability performance and conductivity against reaction with electrolyte. It is observed that the electrodes with Ni:Cu and Ni:Co composition ratio of 100:10 result in the optimum capacitance and cycling stability in both Ni-Cu-OH and Ni-Co-OH electrodes. This improvement in cycling stability can be attributed to the higher redox reversibility as indicated by the smaller CV redox peak separation. In addition, it is found that decreasing Cu and Co ratios, with fixed CBD time, enhances nanoflakes formation, and hence increases electrode capacitance. For the optimum composition (Ni:Co = 100:10), composites of the ternary electrodes with graphene and carbon nanofibers were also tested, with resultant improvement in potential window, equivalent series resistance, areal capacitance and cycling stability.

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Capacitance decay of nanoporous nickel hydroxide

Cited by 157 publications

References 24 publications

Fabrication of a low defect density graphene-nickel hydroxide nanosheet hybrid with enhanced electrochemical performance

Fabrication of a low defect density graphene-nickel hydroxide nanosheet hybrid with enhanced electrochemical performance

Graphene-nickel cobaltite nanocomposite asymmetrical supercapacitor with commercial level mass loading

Ternary Ni–Cu–OH and Ni–Co–OH electrodes for electrochemical energy storage

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