Effect of Alkali Halides Upon Photocurrent Due to Emission of Electrons from Dropping Mercury Electrode Into Water

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Title:Effect of Alkali Halides Upon Photocurrent Due to Emission of Electrons from Dropping Mercury Electrode Into Water
Creators:
Cecchi, Teresa
Passamonti, Paolo
Pucciarelli, Filippo
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 67, 4, pp. 439-453
Uncontrolled Keywords:Photoelectrochemistry, Seven-halves law, DME, Hydrated electrons, Electrolytes

Abstract

When dropping mercury electrode (DME) dipped in ultrapure water, thoroughly deaerated with pure hydrogen, is irradiated with UV light, we can observe a cathodic photocurrent in the non-faradaic region of the polarographic curve, in the absence of scavengers of hydrated electrons. Newly we have followed the effect on photocurrent of initial very small additions of alkali metal chlorides to pure water. By repeated experiments, we could show that first additions of the alkali metal halides increase the photocurrent and that the already known suppression of photocurrent by addition of halides<strong> </strong>begins only after the halide concentration exceeds <i>ca</i> 10<sup>-4</sup> mol l<sup>-1</sup>. We could show for the first time that in ultrapure water and dilute electrolyte solutions, the photocurrent follows a modified seven-halves law. The extent of the positive effect of small additions of alkali metal halides on photocurrent depends on the nature of each alkali metal cation. The reason for this specificity is discussed. <p>

Title:Effect of Alkali Halides Upon Photocurrent Due to Emission of Electrons from Dropping Mercury Electrode Into Water
Creators:
Cecchi, Teresa
Passamonti, Paolo
Pucciarelli, Filippo
Uncontrolled Keywords:Photoelectrochemistry, Seven-halves law, DME, Hydrated electrons, Electrolytes
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:67
Number:4
Page Range:pp. 439-453
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc20020439UNSPECIFIED
ID Code:1933
Item Type:Article
Deposited On:06 Feb 2009 17:14
Last Modified:06 Feb 2009 16:14

Citation

Cecchi, Teresa; Passamonti, Paolo; Pucciarelli, Filippo (2002) Effect of Alkali Halides Upon Photocurrent Due to Emission of Electrons from Dropping Mercury Electrode Into Water. Collection of Czechoslovak Chemical Communications, 67 (4). pp. 439-453. ISSN 0010-0765

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