Electrochemical dilatometer for the measurement of height changes in aqueous electrolytes with nanometer resolution
Watch your electrodes breathing
The ECD-3-nano-aqu is the dilatometer with a displacement resolution in the nanometer range specialized for the use in aqueous electrolytes. Its capacitive parallel-plate sensor system can obtain displacement signals of below 5 nanometers. This high resolution makes it possible to explore new territory of electrochemical dilatometry. For instance, quasi 2-dimensional electrode processes like the SEI formation in lithium-ion batteries or the electrochemically driven growth of passivation layers on metal surfaces might become the subject of future dilatometric studies.
The heart of the ECD-3-nano-aqu is an electrochemical cell, which is hermetically tight against ambient atmosphere. The two electrodes inside are separated by a stiff glass frit that is fixed in position. The upper (working) electrode is sealed by means of a thin metal membrane through which any charge-induced height change is transmitted towards the sensor/load unit above. The cell components in media contact are made of gold and PEEK.