ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Non-enzymatic hydrogen peroxide sensor based on a nanoporous gold electrode modified with platinum nanoparticles

Guang Yin, Ling Xing, Xiu-Ju Ma, and Jun Wan

Key Laboratory of Eco-chemical Engineering, Ministry of Education, College of Environment and Safety Engineering, Qingdao, China

E-mail: wanjundz@sohu.com

Abstract: A novel non-enzymatic electrochemical sensor based on a nanoporous gold electrode modified with platinum nanoparticles was constructed for the determination of hydrogen peroxide (H₂O₂). Platinum nanoparticles exhibit good electrocatalytic activity towards hydrogen peroxide. The nanoporous gold (NPG) increases the effective surface area and has the capacity to promote electron-transfer reactions. With electrodeposition of Pt nanoparticles (NPs) on the surface of the nanoporous gold, the modified Au electrode afforded a fast, sensitive and selective electrochemical method for the determination of H₂O₂. The linear range for the detection of H₂O₂ was from 1.0 × 10⁻⁷ M to 2.0 × 10⁻⁵ M while the calculated limit of detection was 7.2 × 10⁻⁸ M on the basis of the 3σ/slope (σ represents the standard deviation of the blank samples). These findings could lead to the widespread use of electrochemical sensors to detect H₂O₂.

Keywords: hydrogen peroxide – platinum nanoparticles – nanoporous gold – electrodeposition – enzyme-free – amperometric sensor

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-013-0473-y

Chemical Papers 68 (4) 435–441 (2014)