Fabrication and Characterization of Nano-Sized Soluble Prussian Blue K-Fe-Fe Nanoparticles for K+-battery
Chun-Yu Tsai1*, Chi-Hung Lee1, Yu-Shuan Huang1, Chia-Tsun Chen1, Erdembayalag Batsaikhan1, Shih-Chieh Tai1, Wen-Hsien Li1
1Department of Physics, National Central University, Chungli, Taiwan
* presenting author:Chun-Yu Tsai, email:james610739@gmail.com
The K-Fe-Fe phase of Prussian blue analogue (PBA) with a chemical formula KxFe[Fe(CN)6]y[(H2O)6]1-y•zH2O has been recognized as a cathode material for K+-battery. The voids at the centers of lattices are large enough in accommodating potassium or water molecules. Potassium citrate has been used to fabricate nano-sized K-Fe-Fe PBA. The amount of potassium citrate in the chemical mixtures for reaction was used to adjust the K-composition in the resultant K-Fe-Fe PBA. The compounds obtained with molar concentrations of 0.02, 0.06 and 0.08 M are designed as PBAK-1, PBAK-2 and PBAK-3, respectively. The colors of the three compounds are visibly different. PBAK-1 is dark blue, PBAK-3 is light blue, and PBAK-2 is in between, indicating a red shift in absorption when more potassium citrate is introduced into the reaction mixture. Profile refining the x-ray diffraction patterns, employing the General Structure Analysis System (GSAS) program, give K contents of 0.62, 0.75 and 0.54 for the PBAK-1, PBAK-2 and PBAK-3 compounds, respectively. Size analysis followed the Scherrer-Wilson method give mean particle diameters of 27.3, 24.3 and 20.6 nm for the PBAK-1, PBAK-2 and PBAK-3 compounds, respectively.

Keywords: Nanoparticle, Magnetization, Prussian Blue