Influence of surface modification with nitric acid on electrochemical performance of agroindustrial waste-based activated carbon

Daniel I. Arango, Zulamita Zapata-Benabithe, Erika C. Arenas, Juan C. Perez-Osorno

Research output: Contribution to journalArticle in an indexed scientific journalpeer-review

19 Scopus citations

Abstract

Two activated carbons (ACs) were superficially modified with nitric acid (HNO3). The ACs were obtained by chemical activation of palm kernel shell, the first one with KOH at a KOH/AC weight ratio of 2/1 and 700 °C (AC–KOH), and the second one with ZnCl2 at a weight ratio of 1/1 and 735 °C (AC–ZnCl2), both at 5 °C min−1. We modified both, the AC–KOH, and the AC–ZnCl2, taking into account the influence of temperature, impregnation time, chemical/precursor weight ratio on the morphology, textural properties, and electrochemical performance. The morphology was characterized by scanning electron microscopy, and the textural properties by N2 adsorption/desorption at 77 K. The superficial chemistry of the samples was characterized using X-ray photoelectron spectroscopy, and the electrochemical performance by electrochemical impedance spectroscopy in 1 M H2SO4. The best electrochemical behavior of approximately 15 μF cm− 2 was obtained with an impedance of 2.9 Ω with HNO3/AC–KOH weight ratio of 1/1 at 25 °C for 4 h. The increase in the interfacial capacitance is attributed to the high superficial nitrogen content (NXPS: 1.8%) that involved faradic processes, as well as to an enhanced hydrophilic character (wettability) and an improved electron transfer caused by the positive charge of nitrogen species in acid electrolytes.

Original languageEnglish
Pages (from-to)15557-15569
Number of pages13
JournalJournal of Materials Science: Materials in Electronics
Volume29
Issue number18
DOIs
StatePublished - 26 Apr 2018

Bibliographical note

Publisher Copyright:
© 2018, Springer Science+Business Media, LLC, part of Springer Nature.

Types Minciencias

  • Artículos de investigación con calidad A2 / Q2

Fingerprint

Dive into the research topics of 'Influence of surface modification with nitric acid on electrochemical performance of agroindustrial waste-based activated carbon'. Together they form a unique fingerprint.

Cite this