Abstract
A pulse potential-modulated technique was applied to measure the concentration of CO_2 in gas samples. In the first step, an anodic pulse and a consequent cathodic pulse were used to remove the organic pollutant and surface oxide on the surface of the platinized Pt gauze electrode before each experiment. As following, a given potential step was used to reduce the CO_2 into adsorbed intermediate on Pt surface, and the adsorbates produced were oxidized by a following anodic potential step. At same time the oxidation current of adsorbates were measured. A certain relation exists between the concentration of CO_2 and the oxidation charge within the concentration range of (0.015)% to 20%. The approximate linear concentration-charge relation appears during a shorter reduction period and at a lower concentration of CO_2. It's wide convenient and effective for the detection of CO_2 in a relatively wide concentration range.
Keywords
Sensor, Carbon dioxide, Pulse potential-modulated, Solid polymer electrolyte, Pt (electrode)
Publication Date
2004-11-28
Online Available Date
2004-11-28
Revised Date
2004-11-28
Received Date
2004-11-28
Recommended Citation
Hai-chuan WANG, Bing-liang WU.
Investigation of Pulse Potential-modulated Coulometry for CO_2 Detection[J]. Journal of Electrochemistry,
2004
,
10(4): 379-383.
DOI: 10.61558/2993-074X.1589
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol10/iss4/2
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