Electrochemical determination of hydrogen sulfide at carbon nanotube modified electrodes

  • Lawrence N
  • Deo R
  • Wang J
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Carbon nanotube (CNT) modified glassy carbon electrodes exhibiting a strong and stable electrocatalytic response towards sulfide are described. A substantial (400 mV) decrease in the overvoltage of the sulfide oxidation reaction (compared to ordinary carbon electrodes) is observed using the CNT-modified electrode, with oxidation starting at ca. -0.3 V (versus Ag/AgCl; pH 7.4). The CNT-coated electrodes thus allow highly sensitive, low potential (+0.1 V), stable amperometric sensing. A wide linear dynamic range (1.25-112.5 μM) was achieved with a detection limit of 0.3 μM (9 ppb). The enhance sensitivity is coupled to an improved stability. Such ability of carbon nanotubes to promote the sulfide electron-transfer reaction suggests great promise for miniaturized sensors for hydrogen sulfide. © 2004 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • ARC
  • Carbon nanotubes
  • Chemical vapor deposition
  • Electrocatalytic
  • Glassy carbon
  • Sulfide

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