- LSF ID
- 60430
- ORCID
- 0000-0002-9049-4002
- Sonstiges
- der Hochschule zugeordnete*r Autor*in
- GND
- 117475950X
- LSF ID
- 56994
- ORCID
- 0000-0002-8661-6038
- Sonstiges
- der Hochschule zugeordnete*r Autor*in
- GND
- 1067571620
- LSF ID
- 51063
- ORCID
- 0000-0002-1880-6550
- Sonstiges
- der Hochschule zugeordnete*r Autor*in
- LSF ID
- 54351
- ORCID
- 0000-0002-4506-6383
- Sonstiges
- der Hochschule zugeordnete*r Autor*in
- GND
- 1054372470
- LSF ID
- 56790
- Sonstiges
- der Hochschule zugeordnete*r Autor*in
- GND
- 12115226X
- LSF ID
- 47290
- ORCID
- 0000-0001-8395-3541
- Sonstiges
- der Hochschule zugeordnete*r Autor*in
- GND
- 1042780021
- LSF ID
- 56419
- ORCID
- 0000-0003-3407-5011
- Sonstiges
- der Hochschule zugeordnete*r Autor*in
Abstract in Englisch:
By using the crystalline precursor decomposition approach and direct co-precipitation the composition and mesostructure of cobalt-based spinels can be controlled. A systematic substitution of cobalt with redox-active iron and redox-inactive magnesium and aluminum in a cobalt spinel with anisotropic particle morphology with a preferred 111 surface termination is presented, resulting in a substitution series including Co₃O₄, MgCo₂O₄, Co₂FeO₄, Co₂AlO₄ and CoFe₂O₄. The role of redox pairs in the spinels is investigated in chemical water oxidation by using ceric ammonium nitrate (CAN test), electrochemical oxygen evolution reaction (OER) and H₂O₂ decomposition. Studying the effect of dominant surface termination, isotropic Co₃O₄ and CoFe₂O₄ catalysts with more or less spherical particles are compared to their anisotropic analogues. For CAN-test and OER, Co³⁺ plays the major role for high activity. In H₂O₂ decomposition, Co²⁺ reveals itself to be of major importance. Redox active cations in the structure enhance the catalytic activity in all reactions. A benefit of a predominant 111 surface termination depends on the cobalt oxidation state in the as-prepared catalysts and the investigated reaction.