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Au-Pd bimetallic nanoparticle electrodes for direct electroreduction of hexavalent chromium complexes

Moakhar, R. S ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. DOI: 10.1071/CH15660
  3. Publisher: CSIRO , 2016
  4. Abstract:
  5. This paper reports a simple, low-cost, and effective electrochemical technique for sensing and reducing CrVI based on a Au-Pd bimetallic nanoparticle (BNP)-decorated indium tin oxide (ITO) conducting glass electrode. It was observed that the Au-Pd BNP-decorated ITO electrode could significantly boost the electrochemical reduction of CrVI when compared with either Au nanoparticle- or Pd nanoparticle-decorated ITO electrodes. These BNP-decorated electrodes exhibited a wide linear concentration range of 0.001-100 μM, a very low detection limit (signal-to-noise ratio = 3) of 0.3 nM, and a high sensitivity of 1.701 μA μM-1. From electrochemical impedance spectroscopy, it was revealed that this significant improvement was mainly due to the reduction in the charge-transfer resistance, which leads to faster free exchange of the reaction intermediates. The proposed Au-Pd BNP electrode also demonstrated excellent stability, selectivity, repeatability, and reproducibility
  6. Keywords:
  7. Charge transfer ; Chromium compounds ; Electrochemical impedance spectroscopy ; Electrodes ; Electrolytic reduction ; Gold ; Gold alloys ; ITO glass ; Nanoparticles ; Palladium compounds ; Reaction intermediates ; Reduction ; Signal to noise ratio ; Tin oxides ; Bimetallic nanoparticles ; Charge transfer resistance ; Electrochemical reductions ; Electrochemical techniques ; Hexavalent chromium ; Linear concentration ; Low detection limit ; Reproducibilities ; Electrochemical electrodes
  8. Source: Australian Journal of Chemistry ; Volume 69, Issue 4 , 2016 , Pages 423-430 ; 00049425 (ISSN)
  9. URL: http://www.publish.csiro.au/ch/CH15660