NDLI: Manganese dioxide electrode. Part 2.—Hydrogen ion response in the presence of manganese(II) ions

Content Provider	Royal Society of Chemistry (RSC)
Author	Summer, Keith G. Caudle, James Tye, Frank L.
Copyright Year	1973
Abstract	Potential-pH and proton release-pH measurements were made in manganese(II) chloride solutions for a “hydrogen form” electrodeposited γ-manganese dioxide and for a “hydrogen form”β-manganese dioxide. The slope of all potential against pH plots was –0.118 V/pH. Proton release data showed that at least the surface of the manganese dioxide varied throughout these potential against pH plots due to reaction with the solution. When the extent of this reaction was kept constant or made zero by an extrapolation procedure, slopes were –0.059 V/pH. No direct response to manganese(II) ions was observed.It is concluded that the potential determining reaction in all solution is MnO2+ H++ e ⇌ MnOOH and that the –0.118 V/pH slopes are the result of the chemical potential of MnOOH being controlled by the equilibrium MnO2+ Mn2++ 2H2O ⇌ 2MnOOH + 2H+.
Starting Page	885
Ending Page	893
Page Count	9
File Format	PDF
ISSN	03009599
Volume Number	69
Journal	Journal of the Chemical Society, Faraday Transactions 1
DOI	10.1039/F19736900885
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Manganese dioxide Hydrogen Hydronium Manganese(II) chloride PH Proton Chemical potential Electroplating Pourbaix diagram Manganese
Content Type	Text
Resource Type	Article
Subject	Chemistry

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Manganese dioxide electrode. Part 2.—Hydrogen ion response in the presence of manganese(II) ions