In this lecture, we begin discussing the three types of electrochemical sensors: Potentiometric, Amperometric, and Conductometry. The focus of the lecture is the potentiometric and how it is used to measure the potential difference between two electrodes. This is used for sensing ions and helps with determining experimental EMF of the ions. Two types of potentiometric systems were shown. The first one had two electrodes set and the voltage measured between. The second system was a Daniell Cell in which the container the solution was in, was the second electrode. The concentration of ions in a solution can be measured through the detection of the EMF of the cell. Then, the amperometric transducer was discussed and specifically in relation to Oxygen. There is a platinum catalyst that speeds the process of turning oxygen into water and the electrons moving between the electrode to the solution have their amperage measured, Further information will be discussed in the next lecture.
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University of Illinois at Urbana-Champaign, Urbana, IL