Aryl diazonium modification for improved graphite fibre brush in microbial fuel cell

Siti Farah Nadiah Rusli, Mimi Hani Abu Bakar, Kee Shyuan Loh, Mohd Shahbudin Mastar @ Masdar, Seratul Jemiah Abdul Rani

Research output: Contribution to journalArticle

Abstract

Aryl diazonium salts are coupling agents that assist in molecules attachment to interfaces for sensing purposes. Despite not being fully explored and not yet widely applicable for cell-based sensors, the high stability of aryl diazonium salt formed sensing system is highly favorable in biological applications. Carbon-based electrodes are the most commonly used in aryl diazonium modification due to its post grafting stable C-C bond formation. Here, salt bridge based microbial fuel cells (MFCs) were used to study on the effect of aryl diazonium modification on the anode graphite fibre brush. Aryl diazonium salts were in situ generated by the diazonation of p-phenylenediamine with NaNO2 in HCl solution. The electrochemical performance of the aryl diazonium modified graphite brush MFC was measured and compared with the unmodified graphite brush MFC. The power output of the modified graphite brush bioanode was higher (8.33 W/m3) than the unmodified graphite brush (7.60 W/m3) after 20 days of operation with ferricyanide as the catholyte. After 70 days of operation using phosphate buffer solution as the catholyte, the Pmax of modified brush was three times higher (0.06 W/m3) than of the unmodified brush (0.02 W/m3), which indicates an enhanced binding towards the substrate that facilitates a better electron transfer between the microbial and electrode surface.

Original languageEnglish
Pages (from-to)3017-3023
Number of pages7
JournalSains Malaysiana
Volume47
Issue number12
DOIs
Publication statusPublished - 1 Dec 2018

Fingerprint

Graphite fibers
Microbial fuel cells
Brushes
Graphite
Salts
Electrodes
Coupling agents
Buffers
Anodes
Carbon
Phosphates
Molecules
Electrons
Sensors
Substrates

Keywords

  • Aryl diazonium salt
  • Graphite fibre brush modification
  • Microbial fuel cell

ASJC Scopus subject areas

  • General

Cite this

Aryl diazonium modification for improved graphite fibre brush in microbial fuel cell. / Rusli, Siti Farah Nadiah; Abu Bakar, Mimi Hani; Loh, Kee Shyuan; Mastar @ Masdar, Mohd Shahbudin; Rani, Seratul Jemiah Abdul.

In: Sains Malaysiana, Vol. 47, No. 12, 01.12.2018, p. 3017-3023.

Research output: Contribution to journalArticle

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