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Instruments / Technical Area	Publication Details	Published	Actions
I20-Scanning-X-ray spectroscopy (XAS/XES)	A novel synthesis yielding macroporous CaFe2O4 sponges for solar energy conversion Andre Bloesser , Jana Timm , Hannah Kurz , Wolfgang Milius , Shusaku Hayama , Josef Breu , Birgit Weber , Roland Marschall Solar Rrl DOI: 10.1002/solr.201900570 Diamond Proposal Number(s): [23538] Open Access Show Abstract ▼ Abstract: Phase‐pure and highly crystalline CaFe2O4 with a sponge‐like macroporous structure is synthesized for the first time via facile solution‐based microwave reaction and subsequent short thermal treatment. The formation mechanism of the orthorhombic phase (Pnma) and the pore network is investigated in detail and reveals a complex formation of this p‐type semiconductor. Superconducting quantum interference device (SQUID) magnetometry and Mössbauer spectroscopy confirm the phase changes by altered magnetic properties. Furthermore, the optical and photoelectrochemical properties of the material were investigated. The material has a bandgap of 1.9 eV and sufficient band positions for water splitting. Valence‐to‐core X‐ray emission spectroscopy is used to support the band positions obtained from Mott–Schottky analysis. Photocathodes prepared from macroporous CaFe2O4 generate photocurrents under illumination with light of up to 600 nm.	Feb 2020
I15-Extreme Conditions	Stabilization of Monodisperse, Phase-Pure MgFe 2 O 4 Nanoparticles in Aqueous and Nonaqueous Media and Their Photocatalytic Behavior Kristin Kirchberg , Anna Becker , André Bloesser , Tobias Weller , Jana Timm , Christian Suchomski , Roland Marschall The Journal Of Physical Chemistry C DOI: 10.1021/acs.jpcc.7b08780 Show Abstract ▼ Abstract: Monodisperse, monocrystalline magnesium ferrite (MgFe2O4) nanoparticles were synthesized phase purely by fast nonaqueous microwave-assisted solution-phase synthesis. Colloidal stabilization of the nanocrystals in nonaqueous media was realized either in-situ during synthesis or postsynthetically by surface capping with oleylamine and oleic acid. Phase transfer to aqueous media was performed employing citric acid and betaine hydrochloride, resulting in agglomerate-free dispersions of citrate- or betaine-functionalized MgFe2O4 nanocrystals. Furthermore, a one-step synthesis of highly stable, water-dispersible colloids of MgFe2O4 was achieved using polyvinylpyrrolidone as stabilizer. Characterization of the as-synthesized and functionalized nanoparticles was performed employing X-ray diffraction, UV–vis and infrared spectroscopy, thermogravimetry, dynamic light scattering, and transmission electron microscopy. Special focus was laid on phase purity, which was thoroughly monitored using Raman microscopy/spectroscopy. Photocatalytic reactions were performed to evaluate the use of such highly stable ferrite colloids for solar energy conversion.	Nov 2017

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