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Contents Vol 69(4)

Au-Pd Bimetallic Nanoparticle Electrodes for Direct Electroreduction of Hexavalent Chromium Complexes

Roozbeh Siavash Moakhar A B , Mohiedin Bagheri Hariri C , Ajay Kushwaha B , Abolghasem Dolati A D , Mohammad Ghorbani A and Gregory Kia Liang Goh B D
+ Author Affiliations
- Author Affiliations

A Department of Materials Science and Engineering, Sharif University of Technology, Tehran 11155-9466, Iran.

B Institute of Materials Research and Engineering, #08-03, 2 Fusionopolis Way, Innovis, Singapore 138634, Republic of Singapore.

C Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, NM 88003, USA.

D Corresponding authors. Email: dolati@sharif.edu; g-goh@imre.a-star.edu.sg

Australian Journal of Chemistry 69(4) 423-430 https://doi.org/10.1071/CH15660
Submitted: 19 October 2015  Accepted: 18 February 2016   Published: 9 March 2016

Abstract

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.


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