期刊
ACS ENERGY LETTERS
卷 1, 期 1, 页码 57-63出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.6b00029
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资金
- Nanostructures for Electrical Energy Storage (NEES II), an Energy Frontier Research Center (EFRC) - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DESC0001160]
We demonstrate reversible cycle stability for up to 200 000 cycles with 94-96% average Coulombic efficiency for symmetrical delta-MnO2, nanowire capacitors operating across a 1.2 V voltage window in a poly(methyl methacrylate) (PMMA) gel electrolyte. The nanowires investigated here have a Au@delta-MnO2 core@shell architecture in which a central gold nanowire current collector is surrounded by an electrodeposited layer of delta-MnO2 that has a thickness of between 143 and 300 nm. Identical capacitors operating in the absence of PMMA (propylene carbonate (PC), 1.0 M LiClO4) show dramatically reduced cycle stabilities ranging from 2000 to 8000 cycles. In the liquid PC electrolyte, the delta-MnO2 shell fractures, delarninates, and separates from the gold nanowire current collector. These deleterious processes are not observed in the PMMA electrolyte.
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