TY - JOUR A1 - Menga, D. A1 - Wagner, F. E. A1 - Fellinger, Tim-Patrick T1 - Life cycle of single atom catalysts: a Mo¨ssbauer study on degradation and reactivation of tetrapyrrolic Fe–N–C powders JF - Materials Horizons N2 - The degradation of a single-site atomically dispersed, model Fe–N–C powder catalyst with high activity is investigated using cryo-Mössbauer spectroscopy. The results indicate a degradation initiated by an Fe2+ to Fe3+ oxidation due to coordination of oxygen to tetrapyrrolic Fe–N4 sites at atmospheric conditions (change between characteristic doublets) before iron(III) oxide is formed (sextet). Thermal reactivation can be used to restore substantial catalytic activity of aged Fe–N–C powders. KW - Life cycle KW - Atom catalysts KW - Tetrapyrrolic Fe–N–C powders PY - 2023 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-586007 DO - https://doi.org/10.1039/d3mh00308f SN - 2051-6347 SP - 1 EP - 7 PB - Royal Society of Chemistry (RSC) AN - OPUS4-58600 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Menga, D. A1 - Wagner, F. E. A1 - Fellinger, Tim-Patrick T1 - Life cycle of single atom catalysts: a Mössbauer study on degradation and reactivation of tetrapyrrolic Fe–N–C powders JF - Material Horizons N2 - The degradation of a single-site atomically dispersed, model Fe–N–C powder catalyst with high activity is investigated using cryo-Mössbauer spectroscopy. The results indicate a degradation initiated by an Fe2+ to Fe3+ oxidation due to coordination of oxygen to tetrapyrrolic Fe–N4 sites at atmospheric conditions (change between characteristic doublets) before iron(III) oxide is formed (sextet). Thermal reactivation can be used to restore substantial catalytic activity of aged Fe–N–C powders. KW - Single atom catalysts KW - Mössbauer study KW - Tetrapyrrolic Fe–N–C powders PY - 2023 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-589352 DO - https://doi.org/10.1039/d3mh00308f VL - 10 SP - 5577 EP - 5583 PB - Royal Society of Chemistry AN - OPUS4-58935 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -