Electrochemical or electrochemical and photochemical experiments are performed on a collection of samples by suspending a drop of electrolyte solution between an electrochemical experiment probe and one of the samples that serves as a test sample. During the electrochemical experiment, the electrolyte solution is added to the drop and an output solution is removed from the drop. The probe and collection of samples can be moved relative to one another so the probe can be scanned across the samples.
STATEMENT REGARDING GOVERNMENT SPONSORED RESEARCH
 This invention was made with government support under DE-SC0004993/T-105630 awarded by the U.S. Department of Energy. The government has certain rights in the invention.