Journal
CHEMICAL ENGINEERING JOURNAL
Volume 392, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.123690
Keywords
Electroanalysis; Electrocatalysis; Zeolitic imidazolate framework; H2O2
Categories
Funding
- National Natural Science Foundation of China [21575113]
- Natural Science Foundation of Shaanxi Province in China [2017JM2036, 2018JQ2029]
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The work presented that by regulating the proportion between cobalt and 2-methylimidazole in distilled water, a series of Co-based imidazolate framework compounds with diverse shapes were synthesized at ambient temperature. The morphology and structural characteristics of the compounds were surveyed by scanning electron microscope, energy disperse spectra, powder X-ray diffraction and N-2 absorption-desorption. It was found by cyclic voltammetry that the zeolitic imidazolate framework compound synthesized at a ratio of 1:20 had the best electrocatalytic activity to H2O2 reduction, therefore, the compound was chosen to fabricate a H2O2 electrochemical sensor. Electrochemical studies indicated that the sensor had a determination limit of 0.7 mu M and short response time within 3 s. The catalytic current was linear with H2O2 concentration from 2.5 to 212.5, 212.5 to 1662.5 and 1662.5 to 6662.5 mu M and the sensitivity were 12.2, 5.3 and 2.4 mu A mM(-1) cm(-2), respectively. Furthermore, the proposed sensor showed a good anti-interference capacity, repeatability and stability.
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