Boosting the capacitance of NiCo2O4 hierarchical structures on nickel foam in supercapacitors

Du, Haiyan; Li, Yeyu; Ding, Feifei; Zhao, Jinsheng; Zhang, Xianxi; Li, Yun‐Wu; Zhao, Ruijuan; Cao, Mengting; Yu, Tiantian; Xu, Xuejuan

doi:10.1016/j.ijhydene.2018.06.079

Cited by 25 publications

(11 citation statements)

References 49 publications

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“…The spinel oxides composed of transition metals like Co [18][19][20][21][22], Ni [23,24], Zn [25], Mn [26,27], and Fe [28,29] have been identified as potential electrocatalysts for OER application. Co3O4 is one of the spinel oxides which was found to be an excellent OER electrocatalyst [30][31][32][33]. Beside this, bimetallic oxides of cobalt having a spinel structure were investigated in the wide range of energy storage and conversion applications [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

NiCo2O4 nanostructures loaded onto pencil graphite rod: An advanced composite material for oxygen evolution reaction

Ibupoto

Tahira

Shah

et al. 2022

International Journal of Hydrogen Energy

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Section: Introductionmentioning

confidence: 99%

NiCo2O4 nanostructures loaded onto pencil graphite rod: An advanced composite material for oxygen evolution reaction

Ibupoto

Tahira

Shah

et al. 2022

International Journal of Hydrogen Energy

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“…Previous studies have reported that the nucleation, growth, and morphology of LDHs on carbonaceous substrates can be controlled by adding Na 3 C 6 H 5 O 7 Á2H 2 O. 41,42,43 In the absence of Na 3 C 6 H 5 O 7 Á2H 2 O, thin LDH coating layers with a distorted hierarchical structure were formed on the external surface of the carbonaceous substrates. The LDH@s-GO and LDH@s-(GO/o-NH) samples exhibited a three-dimensional hierarchical structure of thin Ni-Co LDH nanosheet-coated microflower-like structures (Figure 2B,D).…”

Section: Resultsmentioning

confidence: 99%

Ni‐Co layered double hydroxide coated on microsphere nanocomposite of graphene oxide and single‐walled carbon nanohorns as supercapacitor electrode material

Kim

Lee

et al. 2022

Intl J of Energy Research

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Summary Ni‐Co layered double hydroxides (LDH) have received considerable attention as excellent pseudocapacitor electrode materials. In this paper, a novel utilization of the composite of graphene oxide (GO) and single‐walled carbon nanohorns (SWCNHs) is reported as an effective substrate for LDH coatings. We successfully synthesized hierarchical nanostructures composed of Ni‐Co LDH as well as microsphere composites of GO and oxidized SWCNHs (o‐NH). A dense microsphere composite of GO and o‐NH was synthesized using the spray‐drying method (s‐(GO/o‐NH)). Subsequently, the prepared Ni‐Co LDH nanosheets were directly coated on the s‐(GO/o‐NH) microspheres using the hydrothermal method (LDH@s‐(GO/o‐NH)). Moreover, the electrochemical characteristics of the LDH@s‐(GO/o‐NH) supercapacitor electrodes were evaluated in a 6 M KOH electrolyte. In the three‐electrode system, the LDH@s‐(GO/o‐NH) composite electrode exhibited a significantly high gravimetric specific capacitance (1046 F g−1 at 1 mV s−1) and excellent specific capacitance retention (84% retention after 10 000 cycles at 100 mV s−1) compared with 211 F g−1 and 79% for the LDH@s‐GO composite electrode, respectively. The supercapacitive behavior of the LDH@s‐GO and LDH@s‐(GO/o‐NH) electrodes in the two‐electrode system exhibited a trend similar to that of the three‐electrode system. The superior electrochemical performance of the LDH@s‐(GO/o‐NH) composite electrode can be ascribed to its high electrical conductivity and pseudocapacitance, indicating that the s‐(GO/o‐NH) microsphere composite with an interconnected pore network structure can be utilized as a support for effectively coating Ni‐Co LDH components. The LDH@s‐(GO/o‐NH) composite electrode is a promising candidate for pseudocapacitor applications because of its excellent electrochemical characteristics and facile synthesis, making it suitable for industrial and consumer applications.

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“…In an alkaline solution rich in Co ions, nickel foam as the substrate will play an important role in the synthesis of Co(OH) 2 due to its surface covered with some intermediate products. Some investigations proved that the nanowire-like Ni-Co-based carbonate hydroxide is formed preferentially on the surface of nickel foam in the hydrothermal process [ 34 , 35 , 36 ]. A large number of the intermediate products adhering to the nickel foam surface possess considerably high surface energy, owing to their very high specific surface area.…”

Section: Resultsmentioning

confidence: 99%

“…The intermediate products synthesized in the hydrothermal process will be transformed into spinel NiCo 2 O 4 nanowires in subsequent annealing. Du et al [ 34 ] prepared the precursor on nickel foam in an alkaline solution (1 mmol Ni(NO 3 ) 2 ·6H 2 O, 2 mmol CoCl 2 ·6H 2 O and 15 mmol HMT dissolved into 70 mL water) by the hydrothermal method. Then, the precursor was annealed to obtain NiCo 2 O 4 nanowires.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Honeycomb-Like Co3O4 Nanosheets with Excellent Supercapacitive Performance by Morphological Controlling Derived from the Alkaline Source Ratio

Jia

Lü

et al. 2018

Materials

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Honeycomb-like Co3O4 nanosheets with high specific surface area were successfully synthesized on porous nickel foam by the facile hydrothermal method followed by an annealing treatment (300 °C), which were used as high-performance supercapacitor electrodes. The effects of the mole ratio of hexamethylenetetramine (HMT) and Co(NO3)2 (1:1, 2:1, 3:1, 4:1, 5:1 and 6:1) as the reactants on the morphological evolution and electrochemical performance of the electrodes were investigated in detail. X-ray diffractometry (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM) were applied to characterize the structure and morphology of the products. The electrochemical performance was measured by cyclic voltammetry (CV) and galvanostatic charge/discharge. The mole ratio of HMT and Co(NO3)2 produced a significant effect on the morphological evolution of Co3O4. The morphological evolution of Co3O4 with the increase in the mole ratio was followed: the nanosheets accompanied with a large number of spherical nanoparticles → the formation of some strip-like particles due to the agglomeration of spherical nanoparticles → the formation of new nanosheets resulting from the growth of strip-like particles → the formation of coarse flower-like particles owing to the connection among the nanosheets → the nanosheets gradually covered with flower-like particles. Accompanied with the change, the specific surface area was increased firstly, and then decreased. A maximum was obtained at a HMT and Co(NO3)2 mole ratio of 4:1. The evolution in morphology of Co3O4 was responsible for the change in electrochemical performance of the electrode. The specific capacitance value of the electrode prepared at a HMT and Co(NO3)2 mole ratio of 4:1 was highest (743.00 F·g−1 at 1 A·g−1 in the galvanostatic charge/discharge test). The similar result was also observed in the CV test with a scanning rate of 5 mV·s−1. Moreover, the electrode also demonstrated an excellent cyclic performance, in which about 97% of the initial specific capacitance remained at 1 A·g−1 for 500 cycles in the galvanostatic charge/discharge test. This excellent electrochemical performance was ascribed to high specific surface area of Co3O4 nanosheets that provide added channels and space for the ions transportation.

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Boosting the capacitance of NiCo2O4 hierarchical structures on nickel foam in supercapacitors

Cited by 25 publications

References 49 publications

NiCo2O4 nanostructures loaded onto pencil graphite rod: An advanced composite material for oxygen evolution reaction

NiCo2O4 nanostructures loaded onto pencil graphite rod: An advanced composite material for oxygen evolution reaction

Ni‐Co layered double hydroxide coated on microsphere nanocomposite of graphene oxide and single‐walled carbon nanohorns as supercapacitor electrode material

Synthesis of Honeycomb-Like Co3O4 Nanosheets with Excellent Supercapacitive Performance by Morphological Controlling Derived from the Alkaline Source Ratio

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