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Upgrading of pine tannin biochars as electrochemical capacitor electrodes

Abstract : Biochar derived from the pyrolysis of pine tannin is a green and available by-product of oil manufacturing that presents interesting features after having been activated by KOH at 650 °C. Different weight ratios of KOH to biochar were used and the resulting activated carbons (ACs) presented highly developed specific surface areas of up to 2190 m 2 g-1 , well-connected porosity and high oxygen content, leading to enhanced electrochemical performance when used as electrochemical capacitor electrodes in a 1 M H 2 SO 4 aqueous electrolyte. Galvanostatic charge/discharge experiments evidenced that the best material achieved a maximum electrode capacitance of up to 232 F g-1 (at 0.5 A g-1) with a capacitance retention of 70% at 10 A g-1 using commercial mass loadings (i.e., approx. 10 mg cm-2). In addition, long cycling stability with a residual capacitance of 92 to 94% after 10,000 cycles at 5 A g-1 was achieved. These results prove that ACs derived from pine tannin biochars have great potential for their commercial use as electrochemical energy storage devices.
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https://hal.univ-lorraine.fr/hal-03387807
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Submitted on : Wednesday, October 20, 2021 - 8:30:56 AM
Last modification on : Thursday, October 21, 2021 - 5:00:57 AM

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Sara Pérez-Rodríguez, Oscar Pinto, Maria Izquierdo, Cristina Segura, Po Poon, et al.. Upgrading of pine tannin biochars as electrochemical capacitor electrodes. Journal of Colloid and Interface Science, Elsevier, 2021, 601, pp.863-876. ⟨10.1016/j.jcis.2021.05.162⟩. ⟨hal-03387807⟩

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