POTENTIOMETRIC HYDROGEN SENSORS WITH PROTON-CONDUCTING SOLID ELECTROLYTES

The operating principles and characteristics of solid-state electroche mical hydrogen sensors built with proton-conducting solid electrolytes were discussed. Selection criteria for the electrolyte, reference ele ctrode, and working electrode were reported. It was shown that in hydr ogen-air mixtures, the steady-state response of a platinum electrode t o changes in hydrogen concentration is determined by hydrogen ionizati on and oxygen ionization, and depends on the oxidation state of the pl atinum surface. The major characteristics of the potentiometric sensor s were reported.