applied sciences Article A Low-Cost Inkjet-Printed Paper-Based Potentiostat † Petroné Bezuidenhout 1,2,*, Suzanne Smith 2 ID and Trudi-Heleen Joubert 1 ID 1 Carl and Emily Fuchs Institute for Microelectronics (CEFIM), University of Pretoria, Pretoria 0002, South Africa; trudi.joubert@up.ac...