Original Article

Journal of Applied Electrochemistry

, Volume 44, Issue 3, pp 419-425

Electrochemical determination of dissolved oxygen based on three dimensional electrosynthesis of silver nanodendrites electrode

  • Di ZhangAffiliated withThe Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Science, Nankai University
  • , Yuxin FangAffiliated withCollege of Acupuncture and Moxibustion, Tianjin University of Traditional Chinese Medicine
  • , Zhiying MiaoAffiliated withThe Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Science, Nankai University
  • , Min MaAffiliated withThe Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Science, Nankai University
  • , Qiang ChenAffiliated withThe Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Science, Nankai University Email author 

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Abstract

In this paper, a highly sensitive electrochemical sensor for dissolved oxygen was prepared. A glassy carbon electrode was modified with silver nanodendrites that were synthesized by electrochemical deposition on the electrode without the use of a surfactant or template. The electrode displayed efficient electrocatalytic reduction of dissolved oxygen to form hydroxy ions via a four-electron reduction pathway, and a significant decrease in the respective overvoltage. The sensor responded linearly to dissolved oxygen in the 1.0–66.7 μM concentration range, and had a remarkably good sensitivity (0.169 μA μM−1) at an applied potential of −300 mV (vs. Ag/AgCl). The lower detection limit was 0.043 μM (at the signal-to-noise ratio of 3), and the response time was 5 s. The good performance was attributed to the enlarged electro-active surface of the dendritic silver nanostructures and to the efficiency of electron transfer between dissolved oxygen and the electrode. The sensor also showed good reproducibility, long-term stability, and relative good selectivity.

Keywords

Dissolved oxygen detection Silver nanodendrites Electrocatalysis Oxygen sensor