Cost-effective synthesis of NiCo 2 O 4 @nitrogen-doped carbon nanocomposite using waste PET plastics for high-performanc
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Cost-effective synthesis of NiCo2O4@nitrogen-doped carbon nanocomposite using waste PET plastics for high-performance supercapacitor Norah Alhokbany1 · Jahangeer Ahmed1 · Mohd Ubaidullah1 · Sultana Mutehri1 · M. A. Majeed Khan2 · Tansir Ahamad1 · Saad M. Alshehri1 Received: 14 June 2020 / Accepted: 10 August 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract A cost-effective bimetallic N iCo2O4@nitrogen-doped carbon (NC) nanocomposite was prepared through bimetallic nickel/ cobalt metal organic frameworks (Ni/Co-MOF) by employing a smart approach to utilize the waste Polyethylene terephthalate (PET) plastics for energy storage applications. The N iCo2O4@NC nanocomposite was characterized successfully using analytical techniques. The nanocomposite comprises high surface area (813 m2 g− 1) and mesoporosity (~ 15 nm). NiCo2O4@ NC nanocomposite demonstrates excellent electrochemical performance with high specific capacitance of ~ 890 F g− 1 at 5 mV s− 1 and ~ 913 F g− 1 at 1 A g− 1 in 6 m KOH electrolyte. The cyclic stability tests confirm excellent retention capacity (~ 99%) with fifty cyclic segments. Low-cost, environmental friendly approach, and rich redox activity of NiCo2O4@NC nanocomposite make it an alternate potential electrode material for energy storage devices.
1 Introduction The continuous depletion of non-renewable energy resources and environmental remediation is the prime concern across the globe. Smart materials are new hope to fulfill clean renewable energy demands for future [1]. Utilization of environment deteriorating waste products for clean energy production is a smart approach for cost-effective process [2]. Among all energy storage devices, supercapacitors regarded a promising energy storage device because of ultrafast charge–discharge, high power/energy density, excellent energy efficiency, cyclic stability, and eco-friendliness [3]. As per the charge storage mechanism, electrode materials can be classified in two categories, i.e., electrostatic doublelayer capacitors (EDLCs) and pseudocapacitors (PCs) types. The materials having both charge storage mechanism could * Jahangeer Ahmed [email protected] * Saad M. Alshehri [email protected] 1
Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
King Abdullah Institute for Nanotechnology (KAIN), King Saud University, Riyadh 11451, Saudi Arabia
2
be regarded as prominent electrode materials. Nickel oxide is considered as one of the best PC materials owing to high theoretical specific capacitance [4], large surface area, and fascinating morphology, but due to poor cycling stability and low electrochemical activity, it restricts the performance. To overcome this problem, cobalt oxide can be used to fabricate a smart bimetallic nanocomposite. This is noticeable that cobalt oxide has excellent electroactive and cyclic stability nature. In the current scenario, the most essential need is to develop the advanced energy devices using low-cost (non-precious) e
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