Nanocrystalline FeWO4 as a pseudocapacitive electrode material for high volumetric energy density supercapacitors operated in an aqueous electrolyte

被引：60

作者：

Goubard-Bretesche, Nicolas ^{[1
,3
]}

Crosnier, Olivier ^{[1
,3
]}

Payen, Christophe ^{[1
]}

Favier, Frederic ^{[2
,3
]}

Brousse, Thierry ^{[1
,3
]}

机构：

[1] Univ Nantes, CNRS, UMR 6502, Inst Mat Jean Rouxel IMN, F-44322 Nantes 3, France

[2] Univ Montpellier 2, UMR CNRS 5253, Inst Charles Gerhardt, F-34095 Montpellier 05, France

[3] CNRS, FR 3459, Reseau Stockage Electrochim Energie RS2E, F-80039 Amiens, France

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2015年 / 57卷

关键词：

Iron tungstate; Pseudocapacitive behavior; High density; Neutral aqueous electrolyte; Supercapacitor; ELECTROCHEMICAL CAPACITORS; PERFORMANCE;

D O I：

10.1016/j.elecom.2015.05.007

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Iron tungstate (FeWO4) has been synthesized using two low-temperature synthetic routes and investigated as a new pseudocapacitive electrode material for supercapacitors operating in a neutral aqueous electrolyte. Its electrochemical properties are clearly related to the specific surface area and seem to originate from Fe3+/Fe2+ fast surface reactions. For FeWO4 obtained by polyol-mediated synthesis, a high volumetric capacitance of 210 F.cm(-3) (i.e. more than two times higher than that of activated carbon) was measured at 20 mV.s(-1) with less than 5% fade over 10,000 cycles. Furthermore, unlike most of the previously investigated iron based electrodes, a unique pseudocapacitive behavior is observed, thus emphasizing the role of the crystallographic structure on the electrochemical signature. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：61 / 64

页数：4

共 16 条

[1] Effect of partial preferential orientation and distortions in octahedral clusters on the photoluminescence properties of FeWO4 nanocrystals [J].