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低浓度二氧化氮的检测有不少方法。这些方法各有特点,但多数不能满足快速和现场瞬时检测的要求。本文研究了一种利用多孔气体扩散电极检测低浓度二氧化氮的控制电位电解方法。本法是将被测气体通过一个由良好导电性和透气性的多孔气体扩散电极组成的电解池,使二氧化氮在工作电极上还原。当工作电极的电位恒定在-0.2伏(vs RE)时,电解电流与二氧化氮的浓度成正比。电解池的电极都可以用金催化膜做电极材料,但参比电极亦可以用铂催化膜为电极材料。电解液为25％的硫酸。本文还研究了电解池的某些特性。证明在适当条件下,它对二氧化氮具有快速、灵敏、稳定等响应特点。
There are many ways to detect low concentrations of nitrogen dioxide. These methods have their own characteristics, but most can not meet the requirements of fast and on-site transient detection. In this paper, a control potential electrolysis method using porous gas diffusion electrode to detect low concentration of nitrogen dioxide was studied. This method is the measured gas through a well-conductive and breathable porous gas diffusion electrode consisting of electrolytic cell, so that the working electrode in the reduction of nitrogen dioxide. When the potential of the working electrode is constant at -0.2 volts (vs RE), the electrolytic current is proportional to the concentration of nitrogen dioxide. Electrolysis cell electrodes can be made of gold catalytic membrane electrode material, but the reference electrode can also be used as a platinum catalytic membrane electrode material. The electrolyte is 25% sulfuric acid. This article also studied some of the characteristics of electrolytic cells. Proved under appropriate conditions, it has a fast, sensitive, stable and other response characteristics of nitrogen dioxide.