Non-aqueous chromium acetylacetonate electrolyte for redox flow batteries

被引：183

作者：

Liu, Qinghua ^{[1
,2
,3
]}

Shinkle, Aaron A. ^{[1
]}

Li, Yongdan ^{[2
,3
]}

Monroe, Charles W. ^{[1
]}

Thompson, Levi T. ^{[1
,4
]}

Sleightholme, Alice E. S. ^{[1
]}

机构：

[1] Univ Michigan, Dept Chem Engn, Ann Arbor, MI 48109 USA

[2] Tianjin Univ, Tianjin Key Lab Catalysis Sci & Technol, Tianjin 300072, Peoples R China

[3] Tianjin Univ, State Key Lab Chem Engn, Sch Chem Engn, Tianjin 300072, Peoples R China

[4] Univ Michigan, Dept Mech Engn, Ann Arbor, MI 48109 USA

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2010年 / 12卷 / 11期

关键词：

Chromium acetylacetonate; Single-metal redox flow battery; Non-aqueous electrolyte; Energy storage; Organic; CR(III) COMPLEXES; CELL;

D O I：

10.1016/j.elecom.2010.09.013

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

A single-metal redox flow battery employing chromium(III) acetylacetonate in tetraethylammonium tetrafluoroborate and acetonitrile has been investigated using electrochemical techniques. Cyclic voltammetry was used to evaluate electrode kinetics. Four redox couples were observed in the stable potential window. The Cr-II/Cr-III, Cr-I/Cr-II, Cr-III/Cr-IV and Cr-IV/Cr-V redox couples all appeared to be quasi-reversible, with the Cr-III/Cr-IV couple exhibiting comparatively slow kinetics. A cell potential of 3.4 V was measured for the one-electron disproportionation of the neutral Cr-III complex. The diffusion coefficient for chromium acetylacetonate in the supporting electrolyte solution was estimated to be in the range of 5.0-6.2 x 10(-7) cm(2) s(-1) at room temperature. The charge-discharge characteristics of this system were evaluated in an H-type glass cell, and coulombic and energy efficiencies of approximately 55% and 20%, respectively, were obtained. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：1634 / 1637

页数：4

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