Electrochemical investigations of Nb2O5/carbon materials from filter paper, microfibrillated and bacterial celluloses by sustainable reductive mineralization

A. HENRY; S. LE VOT; J. ALAUZUN; P. HESEMANN; M. L. FORESTI; P. CERRUTTI; L. HEUX; O. FONTAINE; B. BOURY

ELECTROCHIMICA ACTA

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2019 vol. 313 p. 478 - 487

0013-4686

Cellulose is an attractive reagent for the elaboration of C-containing materials, but here, we alsoconsidered it as an O-provider for preparing macro, micro and nano-fibrous Nb2O5/C composites by anew mineralization with Nb2Cl10 in anhydrous conditions. Our study highlights differences of reactivitybetween filter paper, microfibrillated or bacterial cellulose in connection with the crystallinity and theaccessibility of the hydroxyl groups. The Nb2O5/C ratio was found to be adjustable (55e75% of Nb oxide)depending on the cellulosic precursor. Our composites were tested as electrodes that could be used asnegative electrode in hybrid lithium-capacitor. Electrochemical characterizations of Nb2O5/C compositesare reported and it was demonstrated that characteristics of the starting cellulosic reagents that influencephysico-chemical properties of composites thus impact electrodes performances. Very interestingly,for 1C charging/discharging rates, capacities as good as thus of literature (150mAh g1) were obtainedusing our new sustainable synthesis protocol.