biostudies-literatureDanmo FHNorges Teknisk-Naturvitenskapelige UniversitetNorges Forskningsr?d42439-42448https://www.ebi.ac.uk/biostudies/studies/S-EPMC10510046biostudies-literatureUnknown15(36)Hexagonal manganites, RMnO₃ (R = Sc, Y, Ho-Lu), are potential oxygen storage materials for air separation due to their reversible oxygen storage and release properties. Their outstanding ability to absorb and release oxygen at relatively low temperatures of 250-400 °C holds promise of saving energy compared to current industrial methods. Unfortunately, the low temperature of operation also implies slow kinetics of oxygen exchange in these materials, which would make them inefficient in applications such as chemical looping air separation. Here, we show that the oxidation kinetics of RMnO₃ can be improved through Ti⁴⁺-doping as well as by increasing the rare earth cation size. The rate of oxygen absorption of nanocrystalline RMn_1-<i>x</i>Ti<sub><iACS applied materials & interfacesOxidation Kinetics of Nanocrystalline Hexagonal RMn_1-<i>x</i>Ti_<i>x</i>O₃ (R = Ho, Dy).PMC105100462057653197405/F50Grande TSelbach SMMarshall KPWestermoen ADanmo FHGlaum JNylund IEStoian DfalseOxidation Kinetics of Nanocrystalline Hexagonal RMn_1-<i>x</i>Ti_<i>x</i>O₃ (R = Ho, Dy).Hexagonal manganites, RMnO₃ (R = Sc, Y, Ho-Lu), are potential oxygen storage materials for air separation due to their reversible oxygen storage and release properties. Their outstanding ability to absorb and release oxygen at relatively low temperatures of 250-400 °C holds promise of saving energy compared to current industrial methods. Unfortunately, the low temperature of operation also implies slow kinetics of oxygen exchange in these materials, which would make them inefficient in applications such as chemical looping air separation. Here, we show that the oxidation kinetics of RMnO₃ can be improved through Ti⁴⁺-doping as well as by increasing the rare earth cation size. The rate of oxygen absorption of nanocrystalline RMn_1-<i>x</i>Ti<sub><i2023-01-01T00:00:00Z2023 Sep2025-04-26T04:54:05.411Z2025-04-06T11:15:05.008ZS-EPMC105100463763946810.1021/acsami.3c06020