Synthesis of Porous NiO and ZnO Submicro- and Nanofibers from Electrospun Polymer Fiber Templates

Qiu, Yejun; Yu, Jie; Zhou, Xiaosong; Tan, Cuili; Yin, Jing

doi:10.1007/s11671-008-9221-6

Cited by 40 publications

(14 citation statements)

References 35 publications

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“…The first peak at 26°cor-responds to carbon while the other two peaks at 37°and 43°a re NiO (111) and NiO (200), respectively. These results are in good agreement with those available in literature [27][28][29][30][31][32].…”

Section: Resultssupporting

confidence: 92%

NiO/MWCNT Catalysts for Electrochemical Reduction of CO2

et al. 2015

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This communication reports the electrochemical reduction of CO 2 on high surface area NiO/multi-walled carbon nanotube (MWCNT) catalysts. The catalysts are prepared by an incipient wetness technique with different NiO loadings. The prepared catalysts are characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray (EDX) techniques. A conventional two compartments half-cell and a reverse fuel cell are employed to establish the effects of variation of NiO loading on MWCNT. The characterization results indicate that high surface area of MWCNT provides good NiO dispersion on the catalyst surface. The NiO on MWCNT also shows high electrical conductivity in the fuel cells. In CO 2 reduction, the catalysts demonstrate good CO 2 conversion activity and produce high-pressure effects even at ambient conditions. The reduction product mainly contains syngas (CO and H 2 ). In half-cell evaluation, an increase in current is observed with increasing NiO content up to 20 wt%. Further increase of NiO loading shows no significant increase in current density. Among the studied catalysts, NiO (20 wt%)/MWCNT displays optimum activity in both the half-cell and reverse fuel cell evaluations. With this catalyst, the total faradaic efficiency of 35.2 % is obtained at the potential of −1.7 V versus normal hydrogen electrode (NHE).

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Section: Resultssupporting

confidence: 92%

NiO/MWCNT Catalysts for Electrochemical Reduction of CO2

et al. 2015

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“…Among such oxides, NiO is of particular interest owing to its high theoretical specific capacitance of 2573 F/g [22,23], high chemical/thermal stability, ready availability, environmentally benign nature and lower cost as compared to the state-of-the-art supercapacitor material RuO 2 [24,25]. There have been a variety of reports of the synthesis of different NiO nanostructures including porous nano/microspheres [26], nanoflowers [27], nanosheets [28], and nanofibers [29]. It has been shown that the electrochemical performance of NiO nanocrystals largely depends on its microstructure, surface area, and the presence of dopants [30][31][32][33][34][35], suggesting that the development of controlled syntheses of NiO nanostructures with the desired features, e.g., high electronic conductivity, low diffusion resistance to protons/cations, and high electroactive area is of paramount importance.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of porous NiO nanocrystals with controllable surface area and their application as supercapacitor electrodes

et al. 2010

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We report a facile way to grow various porous NiO nanostructures including nanoslices, nanoplates, and nanocolumns, which show a structure-dependence in their specific charge capacitances. The formation of controllable porosity is due to the dehydration and re-crystallization of β-Ni(OH) 2 nanoplates synthesized by a hydrothermal process. Thermogravimetric analysis shows that the decomposition temperature of the β-Ni(OH) 2 nanostructures is related to their morphology. In electrochemical tests, the porous NiO nanostructures show stable cycling performance with retention of specific capacitance over 1000 cycles. Interestingly, the formation of nanocolumns by the stacking of β-Ni(OH) 2 nanoslices/plates favors the creation of small pores in the NiO nanocrystals obtained after annealing, and the surface area is over five times larger than that of NiO nanoslices and nanoplates. Consequently, the specific capacitance of the porous NiO nanocolumns (390 F/g) is significantly higher than that of the nanoslices (176 F/g) or nanoplates (285 F/g) at a discharge current of 5 A/g. This approach provides a clear illustration of the process-structure-property relationship in nanocrystal synthesis and potentially offers strategies to enhance the performance of supercapacitor electrodes.

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“…Nanostructures and heterostructures made of ZnO have already been used as a transparent conductor in solar cells, varistors and sensors [7,8]. Recently, ZnO nanostructures have draw attentions for possible applications in optoelectronic devices such as nanostructured solar cells, ultra sensitive optical fiber sensors and UV laser diodes [9][10][11]. ZnO nanostructures are required to have high crystalline quality for most applications.…”

Section: Introductionmentioning

confidence: 99%

Heat treatment effects on the surface morphology and optical properties of ZnO nanostructures

Sahdan

Mamat

Muhamad

et al. 2010

Phys. Status Solidi (c)

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Zinc oxide (ZnO) nanostructures have received broad attention due to its wide applications especially for thin‐film solar cells and transistors. In this paper, we report the effects of heat treatment on the structural and optical properties of ZnO nanostructures. Zinc oxide nanostructures were synthesized using thermal chemical vapour deposition (CVD) method on glass substrate. The surface morphologies which were observed by scanning electron microscope (SEM) show that ZnO nanostructures change its shape and size when the annealing temperature increases from 400 °C to 600 °C. Structural measurement using X‐ray diffraction (XRD) has shown that ZnO nanostructures have the highest crystallinity and smallest crystallite size (20 nm) when annealed at 550 °C. Furthermore, the samples were optically characterized using Photoluminescence (PL) spectrometer. The PL spectra indicate that ZnO nanostructures have the highest peak at UV wavelength when annealed at 550 °C. The mechanism of the PL properties of ZnO nanostructures is also discussed. We conclude that ZnO nanostructures deposited using thermal CVD have the optimum structural and PL properties when annealed at 550 °C. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Synthesis of Porous NiO and ZnO Submicro- and Nanofibers from Electrospun Polymer Fiber Templates

Cited by 40 publications

References 35 publications

NiO/MWCNT Catalysts for Electrochemical Reduction of CO2

NiO/MWCNT Catalysts for Electrochemical Reduction of CO2

Synthesis of porous NiO nanocrystals with controllable surface area and their application as supercapacitor electrodes

Heat treatment effects on the surface morphology and optical properties of ZnO nanostructures

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