Journal
APPLIED SURFACE SCIENCE
Volume 511, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.145424
Keywords
Supercapacitor; Asymmetric; Hybrid system; Iron oxide; Nickel phosphide; Low temperature
Categories
Funding
- National Research Foundation of Korea - Ministry of Science, ICT & Future Planning, Republic of Korea [2018R1C1B6001267, 2018R1A5A1025224, 2019R1F1A1041822]
- Ministry of Trade, Industry & Energy (MOTIE, Korea) under Industrial Technology Innovation Program [10062694]
- Creative Materials Discovery Program through the National Research Foundation of Korea [NRF-2016M3D1A1021141]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10062694] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Ministry of Health & Welfare (MOHW), Republic of Korea [S2926476] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2016M3D1A1021141, 2019R1F1A1041822] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Energy storage systems play a vital role in rationalizing the imminent energy crisis and ecological discomfort. The modern tactic of resolving the lack of energy density dispute with flexible hybrid supercapacitors that could generate high power and energy density under different conditions in energy systems. Here, we introduce a simple solvothermal approach at low temperatures to prepare iron oxide and nickel phosphide nanoparticles. The formation of single-phase pure Fe3O4 and Ni2P with high crystallinity was identified through XRD analysis. The morphology of both the Fe3O4 and Ni2P was confirmed as uniformly distributed nanoparticles with an improved active surface area. The electrochemical activity of the prepared Fe3O4 and Ni2P electrodes revealed improved storage capacity (106 & 354 C g(-1)) and high retention capability (90%) at higher current densities with resilient cyclic stability (8000 cycles). Finally, a flexible asymmetric supercapacitor was fabricated and demonstrated superiorly high cyclic stability (20,000 cycles) with an improved energy density (31 Wh kg(-1)) and power density (6400 W kg(-1)). Therefore, the designed metallic Fe3O4 vertical bar vertical bar Ni2P asymmetric system is anticipated to be a promising strategy toward the advancement of future energy systems.
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