Each fixture is machine from polyether ether ketone (PEEK) and contains liquid or gas handling ports. The bill of materials for building the AutoGDE system, not including analytical detection of reaction products, is summarized in Table . The CE and WE fixtures contain electrical contacts for interfacing to the power supply or potentiostat. The CE and WE fixtures are separated using a polymer membrane, which is Selemion anion-exchange membrane in the present work.