Editors’ Choice—Review—Polymer Electrolyte Fuel Cell Science and Technology: Highlighting a General Mechanistic Pattern and a General Rate Expression for Electrocatalytic Processes

This article has been written for students and teachers of the science technology low-temperature fuel cells, as well scientists engineers actively involved in research development this area. It offers first an analysis cell electrocatalytic processes, identifying a common pattern mechanisms these processes which serves basis universal expression describing non-linear V vs log J dependences observed under kinetic control. serves, turn, introduction to reviews several polymer electrolyte technologies covering both engineering aspects including process rate equations electrode processes. These highlight requirement explicit consideration various types overpotential-driven site activation steps experimentally dependences. In addition mature proton-conducting membrane H 2 /air NH 3 cells using hydroxide-ion conducting electrolyte, are also discussed. Finally, brief summary remaining needs priorities is offered each type paper Critical Review Electrochemical Solid State Science Technology (CRES T).