3 years ago

A composite consisting of microporous carbon and cobalt(III) oxide and prepared from zeolitic imidazolate framework-67 for voltammetric determination of ascorbic acid

Sang Rak Choe, Yun Suk Huh, Young-Kyu Han, Yuvaraj Haldorai


A nanoporous carbon/cobalt oxide (NPC/Co3O4) composite was synthesized from a single-precursor (zeolitic imidazolate framework-67). Transmission electron microscopy showed that the Co3O4 nanoparticles with an average particle size of 10 nm (±2 nm) were well dispersed in the NPC matrix. However, in a few places, Co3O4 nanoparticles were aggregated. The composite shows outstanding performance in terms of electrooxidation of ascorbic acid (AA) in phosphate buffer of pH 7.0. The differential pulse voltammetric response of the composite electrode (at 0.12 V vs. SCE) is linear in the 2–240 μM AA concentration range, with a 20 nM detection limit. The electrode exhibits high sensitivity (0.13 μA·μM·cm−2), reliable reproducibility, and good selectivity. The method, when applied to the direct determination of AA in vitamin C tablets, gave recoveries between 98.0 and 102.0%.

Graphical abstract

A nanoporous carbon composite decorated with Co2O3 nanoparticles was prepared from a single precursor (the zeolitic imidazolate framework-67). It shows outstanding performance in terms of electrooxidation of ascorbic acid with high sensitivity (0.13 μA·μM·cm−2), reliable reproducibility, and good selectivity.

Publisher URL: https://link.springer.com/article/10.1007/s00604-018-2669-x

DOI: 10.1007/s00604-018-2669-x

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.