Chemical Engineering

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VALENCE CHANGE ABILITY AND GEOMETRICAL OCCUPATION OF SUBSTITUTION CATIONS DETERMINE THE PSEUDOCAPACITANCE OF SPINEL FERRITE XFE₂O₄ (X = MN, CO, NI, FE)

Abstract

Nanoparticles were then mixed with Vulcan carbon CX72 with a mass ratio of C:XFe2O4 = 40:60. The as-prepared C/XFe2O4 (XFe2O4 = 60 w%) material and polyvinylidene difluoride (PVDF) were mixed in a mass ratio of 90:10 and dispersed in N-methyl pyrrolidone (NMP). The resulting slurry was pasted onto nickel foam substrate (1 cm × 1 cm) with a spatula. After drying at 80 oC for 12 hours, the electrode was pressed at a 10 MPa pressure. Electrochemical Characterization The electrochemical measurements were performed using the three-electrode method in 1 M Na2SO4 electrolyte within the potential window of 0 ~ 0.9 V vs Ag/AgCl. Platinum foil and Ag/AgCl electrode (filled with saturated KCl) were used as counter and reference electrodes, respectively. The cyclic voltammetry curves were collected on a Solartron 1287A potentiostat at the scan rate of 5 m

Material Code

PBM_RBNRX

Reference

(1) Xu, Z.; Shen, C.; Hou, Y.; Gao, H.; Sun, S. Chem. Mater. 2009, 21, 1778. (2) Yan, J.; Fan, Z.; Wei, T.; Qian, W.; Zhang, M.; Wei, F. Carbon 2010, 48, 3825. (3) Wei, C.; Lee, P. S.; Xu, Z. RSC Adv. 2014, 4, 31416. (4) Lee, S. W.; Kim, J.; Chen, S.; Hammond, P. T.; Shao-Horn, Y. ACS Nano 2010, 4, 3889. (5) Calvin, S.; Carpenter, E. E.; Ravel, B.; Harris, V. G.; Morrison, S. A. Phys. Rev. B 2002, 66, 224405.

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