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-A new type of automatic, hypochlorous acid sensor is proposed which is simple in structure, low in price, and easy for maintenance, using no electrolytes or membrane. Sample water is contained in two cells, in one of which HOCI is catalytically decomposed by fine Ni powders that are dispersed by a magnetic stirrer. We measure difference between Au electrode potential of the decomposed water and that of undecomposed water, which corresponds to the output potential of "concentration cell" of HOCI aqueous solution. A prototype sensor gave output of 30mv, against 20ppm HOCI water, with measuring time of 5min. We found that Ni powders (48 nm in average diameter) exhibit stronger HOCI-decomposition catalytic activity than y-Fe20 3 powders (23nm), and that it is not Ni metal but rather the oxidized NiO surface layer which plays a dominant role in the catalytic decomposition of HOC I.

Hypochlorous Acid (HOCI) Sensor Utilizing Ni Fine Powders as Decomposing Catalysts