Low-temperature zirconia oxygen gauges based on RuO2 electrode

Thermodynamic Properties of LaCrO4, La2CrO6, and La2Cr3O12, and Subsolidus Phase Relations in the System Lanthanum–Chromium–Oxygen

“…Pure oxygen gas at a pressure p = 0.1 MPa, used as the reference electrode, was passed inside the (Y 2 O 3 )ZrO 2 tube over a RuO 2 electrode. At low temperatures, RuO 2 is a better catalyst than Pt for the conversion of molecular oxygen to oxygen ions at the triple phase boundary involving oxygen gas, electrocatalyst and solid electrolyte . The RuO 2 electrode was made by inserting few drops of aqueous solution of RuCl 3 inside the (Y 2 O 3 )ZrO 2 tube and drying the solution to get a deposit of RuCl 3 against inside flat surface of the tube.…”

Review—Evolution of the Development of In-Sodium Oxygen Sensor and Its Present Status

“…RuO 2 , a mixed conductor with e − and O 2− ions as mobile species, can be used as electrode material since it has low activation energies and hence would provide high exchange current densities. 22,23 Although, this electrode can be used at low temperatures, its loss as highly volatile RuO 3 during operation of the cells is a disadvantage. The equilibrium oxygen partial pressure in the gas or gas mixture should preferably be within the electrolytic domain boundaries.…”

Thermodynamic properties of RhO2

“…The yttria-stabilized zirconia tube used as the solid electrolyte was leak tested and found to be impervious. A coating of RuO2 was applied on flat inner surfaces of the closed-end tube so that it would serve as a low interfacial impedance electrode at reduced operating temperatures [14]. Drops of 10% aqueous solution of RuCl3 was dropped inside the tube.…”