Electrochemical Reduction of Oxygen and Nitric Oxide on Mn-Based Perovskites with Different A-Site Cations

Table 2

Maximum cathodic current densities in oxygen- and nitric oxide-containing atmospheres for the four manganite-based perovskites, given in mA/cm². The current densities increase with increasing temperature. The apparent selectivity for the reduction of nitric oxide is highest for the LaMnO_3+δ perovskite at 200°C.

Compound	LaMnO3+δ		PrMnO3+δ		SmMnO3+δ		GdMnO3+δ
T/gas	O2	NO	O2	NO	O2	NO	O2	NO
200°C	0.01	0.23	0.01	0.12	0.04	0.04	0.04	0.06
300°C	2.60	2.00	0.20	1.20	1.00	0.80	1.00	1.00
400°C	4.60	3.20	1.00	3.00	4.50	5.00	4.50	6.00