Fig. The AutoGDE electrochemical cell. The cross-section view shows the cell's three custom PEEK fixtures (shaded yellow) atop the mounting platform. The ports in each fixture are labelled by their purpose and/or ancillary pump and valve components to which they are connected. The GDL interface piston and gas handling fixture (bottom) manage the delivery of gas to the catalyst and to subsequent analytical characterization of reaction products. The working electrode fixture (middle) manages the electrical contact to the catalyst as well as the working electrolyte. Separated by a membrane, the counter electrode fixture (top) features a porous counter electrode and recirculating electrolyte.