2113
Extracting Kinetic Information from Bipolar Electrochemistry

Monday, 14 May 2018: 16:20
Room 620 (Washington State Convention Center)
R. K. Anand, K. L. Rahn, K. L. Knoche, J. S. Borchers, and O. L. Riusech (Iowa State University)
Bipolar electrodes (BPEs) hold enormous promise for rapid screening of electrocatalysts owing to their ability to be operated wirelessly – without direct ohmic contact to a power source – and in parallel. A BPE is a conductor, immersed in an ionically conducting phase, that facilitates coupled oxidation and reduction reactions at opposing ends when exposed to an electric field. The current arising from these coupled processes can be monitored if one of the reactions leads to a visible change, such as chemiluminescence or anodic stripping of a metal film. Therefore, an array of BPEs operated with a single pair of driving electrodes can facilitate many electrochemical measurements simultaneously. Several reports have clearly demonstrated the utility of BPEs to obtain relative catalytic activity. However, to date, the extraction of specific activity and kinetic rate constants from these measurements remains challenging. We discuss here the experimental factors that contribute to this challenge and we present initial results demonstrating alternative approaches to extract this valuable information from BPE-based screens.