A Four-Electron Sulfur Electrode Hosting a Cu2+ /Cu+ Redox Charge Carrier.
Angew Chem Int Ed Engl
; 58(36): 12640-12645, 2019 Sep 02.
Article
en En
| MEDLINE
| ID: mdl-31301101
ABSTRACT
The elemental sulfur electrode with Cu2+ as the charge carrier gives a four-electron sulfur electrode reaction through the sequential conversion of SâCuSâCu2 S. The Cu-S redox-ion electrode delivers a high specific capacity of 3044â
mAh g-1 based on the sulfur mass or 609â
mAh g-1 based on the mass of Cu2 S, the completely discharged product, and displays an unprecedently high potential of sulfur/metal sulfide reduction at 0.5â
V vs. SHE. The Cu-S electrode also exhibits an extremely low extent of polarization of 0.05â
V and an outstanding cycle number of 1200 cycles retaining 72 % of the initial capacity at 12.5â
A g-1 . The remarkable utility of this Cu-S cathode is further demonstrated in a hybrid cell that employs an Zn metal anode and an anion-exchange membrane as the separator, which yields an average cell discharge voltage of 1.15â
V, the half-cell specific energy of 547â
Wh kg-1 based on the mass of the Cu2 S/carbon composite cathode, and stable cycling over 110 cycles.
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