Abstract
AbstractThe selective conversion of biomass into high‐value carbon materials has recently been attracting increasing attraction. In this study, a microalga with a high nitrogen content, namely Spirulina platensis, was used as both the carbon and nitrogen precursors in the synthesis of sponge‐like nitrogen‐enriched carbon materials through a one‐step activation method with NaHCO3 as a green activator. The sponge‐like nitrogen‐enriched carbon materials obtained at different activation temperatures were systematically characterized by using SEM, N2 adsorption‐desorption, XRD, Raman, and XPS techniques. A series of tests were performed to investigate the electrochemical characteristics of the obtained carbon materials to determine their potential use as supercapacitors. The results show that sponge‐like nitrogen‐enriched carbon activated at 700 °C, which has a large BET surface area of 865 m2/g and a high nitrogen content of 7.5 wt%, gave the largest specific capacitance of 234.0 F/g at a current density of 1 A/g in a 6 M KOH electrolyte.
Published Version
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