Home > Electrochemistry > UNUSUAL CELL: (-)Ge-KOH.H2O – C(+)


The search for and development of electrochemical cells with new electrolytes or new electrode–electrolyte assemblies  is based on fundamental investigations of the electrochemical activity of materials. This poster present a search, the novelty of which is determined by the previously unknown combination of well-known materials as membrane–electrode assembly. These are a solid electrolyte based on potassium hydroxide monohydrate and a negative semiconducting electrode (germanium).  We have prepared  electrochemically  active cells of the formula(–)Ge|KOH⋅nH2O|C(+). Ge-electrode was the thin plate of  p-Ge( 28 Ω.cm).

The solid electrolyte (KOH monohydrate) studied by us  since 2007[1,2].  As the member of  а family of water–potassium hydroxide system it is well and long known in the physical chemistry. Our interest was devoted to KOH ⋅ nH2O solid hydrates with n = 0.5, 1.0,  2.0. Graphite (C) is well known as a multifunctional electrode .   Recently, it has been shown [2] that silicon exhibitsi in heterostructures with solid potassium hydroxide mono- and dihydrate  electrochemical  activity,  the  character  of which depends on the doping level. It was naturally of interest to expand the group of previously studied electrode materials (C, Si, and Sn) in contact with solid hydroxide proton  conductors by including another group-IV element  Ge.  On three figures electrochemical data by different types are shown. Top left are cyclic voltamograms at different ranges of cell voltage and rates.  The middle picture allows to evaluate the exchange currents in a cell. On the bottom figure EIS  are shown at  some overpotential relatively  e.m.f.=0.7 V.
[1]Yu.M. Baikov, Solid State Ionic  208 (2012) 17.
[2] http://www.solidionic.com

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