Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 500, Issue -, Pages 155-163Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2017.04.022
Keywords
Electrochemical energy storage; Ni/NiO composites nanofibers; High performance
Categories
Funding
- The Leading Human Resource Training Program of Regional Neo industry through the National Research Foundation of Korea (NRF) - Ministry of Science, ICI and future Planning [NRF-2016H1D5A1909732]
- Industrial Strategic technology development program - Ministry of Trade, Industry & Energy (MI, Korea) [10050953]
- National Research Foundation of Korea [2016H1D5A1909732] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Nickel oxide is a promising material for supercapacitors owing to its high theoretical specific capacitance; however, its practical capacitance is far below the theoretical limit. In this work, we report a novel Ni/NiO composite supported by carbon nanofibers as a pseudocapacitor electrode. Characterization of this sample by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller analysis, and contact angle measurements revealed that Ni nanoparticles were uniformly dispersed on the surface of the nanofibers, leading to strong metal-metal oxide interactions and the formation of oxygen vacancies. Such three dimensional hetero-Ni/NiO components afford high conductivity owing to efficient electron transport and abundant surface defects (oxygen vacancies), which result in enhanced supercapacitor performance and energy density (ED). A moderate concentration of oxygen vacancies is crucial for achieving optimized electrochemical activity. As-prepared Ni/NiO-3 nanofibers generated high capacitances of 526 and 400 Fig at current densities of 1 and 10 A/g, respectively, with good stability (80% of the initial capacitance retained after 1000 cycles). Moreover, an ED as high as 65.8 Wh/kg was achieved at a power density of 900 W/kg, which is higher than those of NiO-based supercapacitors. This work provides a strategy for improving the potential of metal oxides for energy storage applications. (C) 2017 Elsevier Inc. All rights reserved.
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