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研究论文

检测CO_2的脉冲电势调制库仑技术

  • 汪海川 ,
  • 吴秉亮
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  • 武汉大学化学系,武汉大学化学系 湖北武汉430072 ,湖北武汉430072

收稿日期: 2004-11-28

  修回日期: 2004-11-28

  网络出版日期: 2004-11-28

Investigation of Pulse Potential-modulated Coulometry for CO_2 Detection

  • WANG Hai-chuan ,
  • WU Bing-liang~
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  • (Department of Chemistry, Wuhan University,Wuhan 430072, China

Received date: 2004-11-28

  Revised date: 2004-11-28

  Online published: 2004-11-28

摘要

应用脉冲电势调制技术,通过控制电极电势可将CO2还原为以吸附COads为主的中间物;之后再将电极电势阶跃到该物种能发生电化学氧化的电势,测量它的暂态氧化电流,得到积分电量Q随被测CO2浓度C的变化关系.对给定的还原时间,在CO2浓度为0.015%~20%的范围内,氧化电量Q与CO2浓度C有确定的对应关系.其中,当还原时间较短及CO2浓度较低情况下,两者有近似线性关系.这是一种可在较宽浓度范围内测定CO2的简便有效方法.

本文引用格式

汪海川 , 吴秉亮 . 检测CO_2的脉冲电势调制库仑技术[J]. 电化学, 2004 , 10(4) : 379 -383 . DOI: 10.61558/2993-074X.1589

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.

参考文献

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