Citation: CAO Hou-Yong, CAO Meng, BI Yi, YU Nai-Sen, LANG Ming-Fei, SUN Jing. Ni-CuO/ITO Electrode for Electrooxidation and Detection of Ethanol[J]. Chinese Journal of Analytical Chemistry, ;2021, 49(10): 1722-1732. doi: 10.19756/j.issn.0253-3820.210565 shu

Ni-CuO/ITO Electrode for Electrooxidation and Detection of Ethanol

CAO Hou-Yong ¹ ,
CAO Meng ¹ ,
BI Yi ¹ ,
YU Nai-Sen ^3,4,, ,
LANG Ming-Fei ^2,, ,
SUN Jing ^1,,

1.
College of Environmental and Chemical Engineering, Dalian University, Dalian 116622, China;
2.
Medical College, Dalian University, Dalian 116622, China;
3.
School of Physics and Materials Engineering, Dalian Minzu University, Dalian 116600, China;
4.
Guangxi Key Laboratory of Precision Navigation Technology and Application, Guilin University of Electronic Technology, Guilin 541004, China

Corresponding author: YU Nai-Sen, LANG Ming-Fei, SUN Jing,
Received Date: 13 June 2021
Revised Date: 21 July 2021

Fund Project: Supported by the Liaoning Province-Shenyang National Laboratory for Materials Science Joint Research and Development Fund (Nos.2019010274-JH3/301, 2019010281-JH3/301), the Natural Science Foundation of Liaoning Province, China(No.2021JH6/10500143) and the Open Fund Projects of Guangxi Key Laboratory of Precision Navigation Technology and Application (No.XLYC1807004).

Ni-CuO/ITO electrode was prepared by sequential electrodeposition of Ni and CuO onto indium tin oxide (ITO) substrate. Scanning electron microscopy (SEM) demonstrated uniform distribution of Ni-CuO nanoflowers on the ITO substrate. X-ray diffraction (XRD) characterization showed that the Ni-CuO was mainly composed of Ni, NiSO₄ and CuO. The electrochemical catalysis of different electrodes for ethanol (100 mmol/L) oxidation was studied in alkaline solution (1 mol/L KOH). ITO and CuO/ITO electrodes had negligible electrochemical activity, while the Ni-CuO electrode had high electrochemical activity, exhibiting oxidative peak current density of 20.90 mA/cm², 1.7 times as high as that of the Ni/ITO. Furthermore, the electrochemical responses of the Ni-CuO electrode at different scan rates (20-100 mV/s) and toward different concentrations (10-500 mmol/L) of ethanol were inspected. By investigating the relationship between the amount of Ni and CuO deposition and the electrochemical catalysis of ethanol, the highest catalytic activity was achieved with potentiostatic Ni deposition for 300 s and CuO deposition for two cyclic voltammetry (CV) cycles. The Ni-CuO/ITO electrode retained 54.39% of its initial oxidative peak current density over a 10000-s stability test by chronoamperometry, exhibiting high long-term stability. A linear relationship was obtained between the oxidative peak current densities of the Ni-CuO/ITO electrode and the ethanol concentrations ranging from 0.1 mmol/L to 15 mmol/L, with an ethanol detection sensitivity of 150 μA/(cm² (mmol/L)), a detection limit of 0.047 μmol/L (S/N=3) and recoveries of 95.2%-104.1%. In addition, excellent anti-interference was found when NaCl, KCl, disodium hydrogen phosphate, sorbic acid, and citric acid were added as interference species during the ethanol detection. These results suggested that the Ni-CuO/ITO electrode had potential practical applications in detection of ethanol.
- Electrochemical catalysis,
- Nanoflower structure,
- Ni-CuO electrode,
- Ethanol oxidation,
- Ethanol detection
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