The hydrogen electrode in the “dry”: A Kelvin probe approach to measuring hydrogen in metals

► Work function of palladium in nitrogen atmosphere is a function of hydrogen content. ► The surface of hydrogen charged palladium behaves like an hydrogen electrode. ► A thin palladium film evaporated on another metal takes up its hydrogen. ► Stable collection of the released hydrogen possible over days and weeks ► Quantifiable high sensitivity measurement of diffusible hydrogen in metals