High Performance N‐Doped Carbon Electrodes Obtained via Hydrothermal Carbonization of Macroalgae for Supercapacitor Applications. Issue 18 (2nd July 2018)

• Record Type: Journal Article
• Authors: Ren, Meng; Jia, Ziyang; Tian, Zhongwei; Lopez, Diana; Cai, Jinjun; Titirici, Maria‐Magdalena; Jorge, A. Belen
• Is Part Of: ChemElectroChem. Volume 5:Issue 18(2018)
• Page Start: 2686
• Page End: 2693
• Publication Date: 2018-07-02
• Subjects: Biomass -- Hydrothermal carbonization -- N-doped carbon -- Electrode -- Supercapacitor; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.201800603
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: The conversion of bio‐waste into useful porous carbons constitutes a very attractive approach to contribute to the development of sustainable energy economy, even more as they can be used in energy storage devices. Here we report the synthesis of N‐doped carbons from hydrothermal carbonization of macroalgae, Enteromorpha prolifera (EP), followed by a mild KOH activation step. The obtained N‐doped carbons exhibited surface areas of up to ∼2000 m 2 /g with N‐loadings varied in the range of 1.4∼2.9 at %. By modifying activation temperature, we were able to tune the surface chemistry and porosity, achieving excellent control of their properties. The specific capacitance reached values of up to 200 F/g at 1 A/g in 6 M KOH for the sample obtained at activation temperature of 700 °C (AHC‐ 700 ). The symmetric supercapacitor using the sample activated at 800 °C (AHC‐ 800 ) as electrodes exhibited the highest cycling stability of the samples studied in this work, with capacitance retention of up to 96 % at 10 A/g, even after 10, 000 cycles, constituting the highest reported for biomass‐derived carbon electrodes. These results show the great potential of N‐doped carbons as electrodes for supercapacitors and confirm the excellent electrochemical properties of biomass‐derived carbons in energy storage technologies. Abstract : Upcycling macroalgae : N‐doped carbon is obtained from hydrothermal pyrolysis and mild KOH activation using macaroalgae biomass as precursor, involving surface area of 2000 m 2 /g with spheric morphology. The carbon material can serve as promising electrode for supercapacitors. The assembled supercapacitor shows excellent cycling stability with a capacitance retention highly up to 96 % at 10 A/g even after 10000 cycles.