Rechargeable proton-exchange membrane batteries that employ organic chemical hydrides as hydrogen-storage media have the potential to serve as next-generation power sources; however, significant challenges remain regarding the improvement of the reversible hydrogen-storage capacity. Here, we address this challenge through the use of metal-ion redox couples as energy carriers for battery operation. Carbon, with a suitable degree of crystallinity and surface oxygenation, was used as an effective anode material for the metal redox reactions. A SnInPO-based electrolyte membrane allowed no crossover of vanadium ions through the membrane. The V/V, V/V, and Sn/Sn redox reactions took place at a more positive potential than that for hydrogen reduction, so that undesired hydrogen production could be avoided. The resulting electrical capacity reached 306 and 258 mAh g for VOSO and SnSO, respectively, and remained at 76 and 91 % of their respective initial values after 50 cycles.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4964886 | PMC |
| http://dx.doi.org/10.1002/celc.201500473 | DOI Listing |
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