Browse Prior Art Database

Noise Source Isolation for Electrochemical Interfaces

IP.com Disclosure Number: IPCOM000052989D
Original Publication Date: 1981-Aug-01
Included in the Prior Art Database: 2005-Feb-12
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Kanazawa, KK: AUTHOR

Abstract

An improved potentiostat/electrochemical cell system with low levels of extraneous electronic noise includes two working electrodes that are maintained at the same potential. With this system the random noise generated at the metal/electrolyte interface in an electrochemical cell can be isolated for study from the random noise generated in other regions of the cell and from the random noise generated in associated electronic circuitry. The difference between the currents to two virtually identical working electrodes poised to the same potential is monitored, resulting in the cancellation of coherent current components.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 68% of the total text.

Page 1 of 2

Noise Source Isolation for Electrochemical Interfaces

An improved potentiostat/electrochemical cell system with low levels of extraneous electronic noise includes two working electrodes that are maintained at the same potential. With this system the random noise generated at the metal/electrolyte interface in an electrochemical cell can be isolated for study from the random noise generated in other regions of the cell and from the random noise generated in associated electronic circuitry. The difference between the currents to two virtually identical working electrodes poised to the same potential is monitored, resulting in the cancellation of coherent current components.

As show in the drawing, the potentiostat/electrochemical cell system 10 has a counter electrode 12, a reference electrode 14 and two working electrodes 16 and 18. The cell system 10 is placed under potentiostatic control with the operational amplifiers 20 and 22 configured to measure the current difference between the two working electrodes having a minimum part count to keep extraneous electronic noise down.

The requirements for the differencing circuitry are that the current difference is obtained while maintaining both working electrodes 16 and 18 at the same potential. In this case, both electrodes 16 and 18 are maintained at virtual ground. The standard differencing circuit provides a voltage e(N) which is proportional to the current difference i(16)-i(18). For the circuit parameters shown,...