Effect of surface and bulk properties of mesoporous carbons on the electrochemical behavior of GOx-nanocomposites

Tsai Garcia-Perez, Shouzhen Hu, Youngho Wee, Louis Scudiero, Conrad Hoffstater, Jungbae Kim, Su Ha

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Biofuel cell (BFC) electrodes are typically manufactured by combining enzymes that act as catalysts with conductive carbon nanomaterials in a form of enzyme-nanocomposite. However, a little attention has been paid to effects of the carbon nanomaterials' structural properties on the electrochemical performances of the enzyme-nanocomposites. This work aims at studying the effects of surface and bulk properties of carbon nanomaterials with different degrees of graphitization on the electrochemical performances of glucose oxidase (GOx)-nanocomposites produced by immobilizing GOx within a network of carbon nanopaticles. Two types of carbon nanomaterials were used: graphitized mesoporous carbon (GMC) and purified mesoporous carbon (PMC). Graphitization index, surface functional groups, hydrophobic properties, and rate of aggregation were measured for as-received and acid-treated GMC and PMC samples by using Raman spectrometry, X-ray photoelectron spectroscopy (XPS), contact angle measurement, and dynamic light scattering (DLS), respectively. In addition to these physical property characterizations, the enzyme loading and electrochemical performances of the GOx-nanocomposites were studied via elemental analysis and cyclic voltammetry tests, respectively. We also fabricated BFCs using our GOx-nanocomposite materials as the enzyme anodes, and tested their performances by obtaining current-voltage (IV) plots. Our findings suggest that the electrochemical performance of GOx-nanocomposite material is determined by the combined effects of graphitization index, electrical conductivity and surface chemistry of carbon nanomaterials.

Original languageEnglish
Article number84
JournalFrontiers in Chemistry
Volume7
Issue numberFEB
DOIs
Publication statusPublished - 2019 Jan 1

Keywords

  • Biofuel cells
  • Enzymatic nanocomposites
  • Glucose oxidase
  • Graphitization index
  • Graphitized mesoporous carbon
  • Hydrophobic properties

ASJC Scopus subject areas

  • Chemistry(all)

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