A Novel Synthesis Yielding Macroporous CaFe2O4 Sponges for Solar Energy Conversion,Solar RRL

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A Novel Synthesis Yielding Macroporous CaFe2O4 Sponges for Solar Energy Conversion
Solar RRL ( IF 6.0 ) Pub Date : 2020-02-19 , DOI: 10.1002/solr.201900570
André Bloesser ₁ , Jana Timm ₁ , Hannah Kurz ₁ , Wolfgang Milius ₁ , Shusaku Hayama ₂ , Josef Breu ₁ , Birgit Weber ₁ , Roland Marschall ₁

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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.

中文翻译：

新型合成大孔CaFe2O4海绵用于太阳能转化

通过基于溶液的简便微波反应和随后的短暂热处理，首次合成了具有海绵状大孔结构的纯相和高度结晶的CaFe ₂ O ₄。正交相（Pnma）的形成机理）和孔网络进行了详细研究，并揭示了这种p型半导体的复杂形成。超导量子干涉仪（SQUID）磁力仪和Mössbauer光谱仪通过改变磁性能来确认相变。此外，研究了该材料的光学和光电化学性质。该材料的带隙为1.9 eV，具有足够的带位用于水分解。价芯X射线发射光谱用于支持从Mott–Schottky分析获得的谱带位置。由大孔CaFe ₂ O ₄制备的光电阴极在高达600 nm的光照射下产生光电流。

更新日期：2020-02-19

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