scholarly journals Resistance-based analysis of limiting interfaces in multilayer water splitting photocathodes by impedance spectroscopy

2019 ◽  
Vol 3 (8) ◽  
pp. 2067-2075 ◽  
Author(s):  
Thomas Moehl ◽  
Wei Cui ◽  
René Wick-Joliat ◽  
S. David Tilley
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Water Splitting ◽  
Electrochemical Impedance

Electrochemical impedance spectroscopy is used to determine the potential-dependent resistances in multilayer photocathodes for water splitting. Limitations in the devices can thereby be identified and improvements proposed and investigated.

scholarly journals Electrochemical Impedance Spectroscopy of Anion-Exchange Membrane AMX-Sb Fouled by Red Wine Components

Membranes ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 2
Author(s):  
Anton Kozmai ◽  
Veronika Sarapulova ◽  
Mikhail Sharafan ◽  
Karina Melkonian ◽  
Tatiana Rusinova ◽  
...  
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Water Splitting ◽  
Anion Exchange ◽  
Red Wine ◽  
Electrochemical Impedance ◽  
Anion Exchange Membrane ◽  
Limiting Current ◽  
Bipolar Structure ◽  
Exchange Membrane

The broad possibilities of electrochemical impedance spectroscopy for assessing the capacitance of interphase boundaries; the resistance and thickness of the foulant layer were shown by the example of AMX-Sb membrane contacted with red wine from one side and 0.02 M sodium chloride solution from the other side. This enabled us to determine to what extent foulants affect the electrical resistance of ion-exchange membranes, the ohmic resistance and the thickness of diffusion layers, the intensity of water splitting, and the electroconvection in under- and over-limiting current modes. It was established that short-term (10 h) contact of the AMX-Sb membrane with wine reduces the water-splitting due to the screening of fixed groups on the membrane surface by wine components. On the contrary, biofouling, which develops upon a longer membrane operation, enhances water splitting, due to the formation of a bipolar structure on the AMX-Sb surface. This bipolar structure is composed of a positively charged surface of anion-exchange membrane and negatively charged outer membranes of microorganisms. Using optical microscopy and microbiological analysis, it was found that more intense biofouling is observed on the AMX-Sb surface, that has not been in contacted with wine.

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