Investigating the Cycling Stability of Fe2WO6 Pseudocapacitive Electrode Materials

The stability upon cycling of Fe2WO6 used as a negative electrode material for electrochemical capacitors was investigated. The material was synthesized using low temperature conditions for the first time (220 degrees C). The electrochemical study of Fe2WO6 in a 5 M LiNO3 aqueous electrolyte led to a specific and volumetric capacitance of 38 F g(-1) and 240 F cm(-3) when cycled at 2 mV center dot s(-1), respectively, associated with a minor capacitance loss after 10,000 cycles. In order to investigate this very good cycling stability, both surface and bulk characterization techniques (such as Transmission Electron Microscopy, Mossbauer spectroscopy, and magnetization measurements) were used. Only a slight disordering of the Fe3+ cations was observed in the structure, explaining the good stability of the Fe2WO6 upon cycling. This study adds another pseudocapacitive material to the short list of compounds that exhibit such a behavior up to now.

Automated summary

Fe2WO6 synthesized at low temperature showed good cycling stability as a negative electrode material for electrochemical capacitors, with only minor capacitance loss after a large number of cycles. Various characterization techniques revealed that only slight disordering of Fe3+ cations was observed in the structure, explaining the excellent stability of Fe2WO6 during cycling. This study adds Fe2WO6 to the list of compounds exhibiting such behavior, expanding the understanding of pseudocapacitive materials.