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Inside back cover

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Sustainable Energy & Fuels Vol - 1 Issue - 1

Asymmetric tin–vanadium redox electrolyte for hybrid energy storage with nanoporous carbon electrodes

Content Provider	Royal Society of Chemistry (RSC)
Author	Lee, Juhan Jäckel, Nicolas Presser, Volker Tolosa, Aura Kim, Daekyu Krüner, Benjamin Fleischmann, Simon Zeiger, Marco
Copyright Year	2017
Abstract	In recent decades, redox-active electrolytes have been applied in stationary energy storage systems, benefitting from Faradaic reactions of the electrolyte instead of the electrode material. One of the challenging tasks is to balance the redox activities between the negative and positive electrode. As a possible solution, a mixed electrolyte with vanadyl and tin sulfate was previously suggested; however, a low power performance is a great challenge to be overcome. Here, we found that the origin of the poor power performance in the mixture electrolyte system (vanadium complex and tin solution) is the reduction of the pore volume at the positive electrode via irreversible tin dioxide formation. To prevent the latter, we introduce a hybrid energy storage system exhibiting both battery-like and supercapacitor-like features via asymmetric redox electrolytes at the microporous activated carbon electrodes; SnF2 solution as anolyte and VOSO4 as catholyte. By employing an anion exchange membrane, the irreversible SnO2 formation at the positive electrode is effectively suppressed; thus, an asymmetric 1 M SnF2\|3 M VOSO4 system provides a high maximum specific power (3.8 kW kg−1 or 1.5 kW L−1), while still exhibiting a high maximum specific energy up to 58.4 W h kg−1 (23.4 W h L−1) and a high cycling stability over 6500 cycles.
Starting Page	299
Ending Page	307
Page Count	9
File Format	HTM / HTML PDF
ISSN	23984902
Volume Number	1
Issue Number	2
Journal	Sustainable Energy & Fuels
DOI	10.1039/c6se00062b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Power density Electrode Vanadium Redox Vanadyl ion Vanadyl sulfate Sulfuric acid Specific energy Electrolyte Activated carbon Tin Faradaic Electrolysed water Ion-exchange membranes Energy storage
Content Type	Text
Resource Type	Article
Subject	Fuel Technology Renewable Energy, Sustainability and the Environment Energy Engineering and Power Technology

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