# Phase evolution in calcium molybdate nanoparticles as a function of synthesis temperature and its electrochemical effect on energy storage

Minakshi, Manickam 1; Mitchell, David R. G.; Baur, Christian 1; Chable, Johann 1; Barlow, Anders J.; Fichtner, Maximilian 1; Banerjee, Amitava; Chakraborty, Sudip; Ahuja, Rajeev
1 Karlsruher Institut für Technologie (KIT)

##### Abstract:
The design of a suitable electrode is an essential and fundamental research challenge in the field of electrochemical energy storage because the electronic structures and morphologies determine the surface redox reactions. Calcium molybdate (CaMoO$_{4}$) was synthesized by a combustion route at 300 °C and 500 °C. We describe new findings on the behaviour of CaMoO$_{4}$ and evaluate the influence of crystallinity on energy storage performance. A wide range of characterization techniques was used to obtain detailed information about the physical and morphological characteristics of CaMoO$_{4}$. The characterization results enable the phase evolution as a function of the electrode synthesis temperature to be understood. The crystallinity of the materials was found to increase with increasing temperature but with no second phases observed. Molecular dynamics simulation of electronic structures correlated well with the experimental findings. These results show that to enable faster energy storage and release for a given surface area, amorphous CaMoO$_{4}$ is required, while larger energy storage can be obtained by using crystalline CaMoO$_{4}$. ... mehr

 Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU) Publikationstyp Zeitschriftenaufsatz Publikationsjahr 2019 Sprache Englisch Identifikator ISSN: 2516-0230 KITopen-ID: 1000129613 Erschienen in Nanoscale advances Verlag Royal Society of Chemistry (RSC) Band 1 Heft 2 Seiten 565–580 Vorab online veröffentlicht am 08.10.2018 Nachgewiesen in ScopusWeb of ScienceDimensions
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