Performance of surface renewable pH electrodes based on RuO2–graphite–epoxy composites. Issue 10 (22nd February 2017)

• Record Type: Journal Article
• Authors: Huang, Shanluo; Jin, Yan; Su, Ziqi; Jin, Qinghui; Zhao, Jianlong
• Is Part Of: Analytical methods. Volume 9:Issue 10(2017)
• Page Start: 1650
• Page End: 1657
• Publication Date: 2017-02-22
• Subjects: Chemistry, Analytic -- Periodicals; Analytical biochemistry -- Periodicals; Chemical laboratories -- Standards -- Periodicals; 543.1905
• DOI: 10.1039/c6ay02950g
• Languages: English
• ISSNs: 1759-9660

Abstract

Abstract : In this work, surface renewable pH electrodes comprising RuO2 –graphite–epoxy composites were developed. Abstract : In this work, surface renewable pH electrodes comprising RuO2 –graphite–epoxy composites were developed. Three electrode types with different composite ratios were fabricated and their performance was investigated in detail by the potentiometric method. The experimental results show that the RuO2 based pH sensors exhibit sub-Nernstian responses of 40–50 mV pH −1 in the pH range 2–12 and the one with the highest amount of RuO2 shows the best performance. It is found that the properties of electrodes would change as they are aged in pH 7 buffer, and 10 days seem to be enough to get a stable result. The pH sensing mechanism is discussed on the basis of electrochemical impedance measurements. Finally, renewability of the pH electrodes is discussed and it is found that the electrodes exhibit stable pH sensitivity.