3D hierarchical mesoporous roselike NiO nanosheets for high-performance supercapacitor electrodes

Yao, Mingming; Hu, Zhonghua; Liu, Yafei; Li, Peipei; Ai, Zhihong; Rudolf, Olga

doi:10.1016/j.jallcom.2015.06.098

Cited by 47 publications

(7 citation statements)

References 29 publications

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“…Both of these attributes are benecial for enlarging the electrode/electrolyte contact area and shortening the path length for lithium ions transport, which result in superior cycling performance and higher capacity. 36 (iii) It is also believed that the Co 2+ ions act as an elastic buffer in the doped sample which reduces the strain resulted from the volume change during cycling and prevents electrode pulverization guaranteeing good electrical conductivity and rate capability. 12,27 These results strongly suggest that Co doping and the novel nanosheet structure of the doped NiO material are responsible for enhancing the p-type electronic conductivity resulting in improved electrochemical performance.…”

Section: Resultsmentioning

confidence: 99%

Facile hydrothermal synthesis of flower-like Co-doped NiO hierarchical nanosheets as anode materials for lithium-ion batteries

Tong

2015

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

Facile hydrothermal synthesis of flower-like Co-doped NiO hierarchical nanosheets as anode materials for lithium-ion batteries

Tong

2015

RSC Adv.

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“…The observed spin-orbit splitting of Zn 2p between Zn 2p 3/2 and Zn 2p 1/2 for the ZN(a) nanostructure is about 23 eV, which is consistent with the corresponding value of pure ZnO, indicating a normal state of Zn 2+ in ZN(a) sample. 34 In Fig. 4c, the XPS spectrum of Ni 2p 3/2 consists of three components located at about 854 eV, 856 eV and 861 eV respectively, 35 which are all ascribed to Ni-O bond.…”

Section: Structural and Morphological Characteristicsmentioning

confidence: 99%

Hierarchical core/shell ZnO/NiO nanoheterojunctions synthesized by ultrasonic spray pyrolysis and their gas-sensing performance

Zhang

Liu

et al. 2016

CrystEngComm

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ZnO nanorod arrays decorated with NiO nanosheets on FTO substrates were prepared via a simple ultrasonic spray pyrolysis process combined with chemical bath method. The synthesized samples were characterized and analyzed by scanning electron microscopy and X-ray diffraction. The hierarchical and porous morphologies of ZnO/NiO core-shell nanoheterojunctions could be controlled by changing the growth time of NiO sheets. The "oriented attachment" and "self-assembly" crystal growth mechanisms were proposed to explain the formation of the ZnO/NiO nanostructures. Sensors based on the ZnO/NiO heterojunction nanostructure were fabricated and investigated for their ethanol-sensing properties. The result indicated that response was about 180% toward 100 ppm ethanol at an operating temperature of 200 °C.The growth approach in this work offers a new technique for the design and synthesis of transition metal oxide hierarchical nanoarrays which are promising for gas sensing applications.

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“…The pores generated through decarboxylation and dehydration reactions act as a reservoir for ion/electron transportation and accommodation in CCO. In addition, the interconnected nanoparticle array in nanospikes of CCO urchin architectures creates a better electron hopping environment, which was mirrored by increasing the conductivity (peak current) value . However, further phase transformation with sulfide anions possesses a much-extended impact on electrochemical and conductivity behavior, due to the lower electronegativity and greater covalency of sulfide anions along with the synergistic effect of multi-metal redox species.…”

Section: Resultsmentioning

confidence: 99%

Exchanging Anion in CuCo─Carbonate Double Hydroxide for Faradaic Supercapacitors: A Case Study

George

Kundu

2023

ACS Omega

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A systematic synthetic method involving the anion exchange process was designed and developed to fabricate the superior functioning three-dimensional (3-D) urchin-architectured copper cobalt oxide (CuCo2O4; CCO) and copper cobalt sulfide (CuCo2S4; CCS) electrode materials from copper–cobalt carbonate double hydroxide [(CuCo)2(CO3)(OH)2; CCH]. The effective tuning of chemical, crystalline, and morphological properties was achieved during the derivatization process of CCH, based on the anion exchange effect and phase transformation without altering the 3-D spatial assembly. Benefiting from morphological and structural advantages, CCO and CCS exhibited superior electrochemical activity with capacity values of 1508 and 2502 C g–1 at 10 A g–1 to CCH (1182 C g–1 at 10 A g–1). The thermal treatment of CCH has generated a highly porous nature in nanospikes of 3-D urchin CCO structures, which purveys betterment in electrochemical phenomena than pristine smooth-surfaced CCH. Meanwhile, the sulfurization reaction induced the anion effect to a greater extent in the CCS morphology, resulting in hierarchical 3-D urchins formed by 1-D nanospikes constituting coaxially swirled 2-D nanosheets with high exposure of active sites, specific surface areas, and 3-D electron/ion transportation channels. The asymmetric supercapacitor was constructed with a superior CCS electrode as a cathode and an activated carbon electrode as an anode, showing a high specific capacity of 287.35 C g–1 at 7 A g–1 and durability for 5000 cycles with 94.2% retention at a high current density of 30 A g–1. The ultrahigh energy and power density of 135.3 W h kg–1 (10 A g–1) and 44.35 kW kg–1 (30 A g–1) were harvested during the PC device performance. Our finding proposes an idea about the importance of anions and phase transformation as a versatile tool for engineering high-functioning electrode materials and their endeavor toward overwhelming the major demerit of SCs by aggrandizing the energy density value and rate performance.

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3D hierarchical mesoporous roselike NiO nanosheets for high-performance supercapacitor electrodes

Cited by 47 publications

References 29 publications

Facile hydrothermal synthesis of flower-like Co-doped NiO hierarchical nanosheets as anode materials for lithium-ion batteries

Facile hydrothermal synthesis of flower-like Co-doped NiO hierarchical nanosheets as anode materials for lithium-ion batteries

Hierarchical core/shell ZnO/NiO nanoheterojunctions synthesized by ultrasonic spray pyrolysis and their gas-sensing performance

Exchanging Anion in CuCo─Carbonate Double Hydroxide for Faradaic Supercapacitors: A Case Study

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