Self-Generated Nanoporous Silver Framework for High-Performance Iron Oxide Pseudocapacitor Anodes

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The rapid development of electric vehicles is increasing the demand for next-generation fast-charging energy storage devices with a high capacity and long-term stability. Metal oxide/hydroxide pseudocapacitors are the most promising technology because they show a theoretical capacitance that is 10-100 times higher than that of conventional supercapacitors and rate capability and long-term stability that are much higher than those of Li-ion batteries. However, the poor electrical conductivity of metal oxides/hydroxides is a serious obstacle for achieving the theoretical pseudocapacitor performance. Here, a nanoporous silver (np-Ag) structure with a tunable pore size and ligament is developed using a new silver halide electroreduction process. The structural characteristics of np-Ag (e.g., large specific surface area, electric conductivity, and porosity) are desirable for metal oxide-based pseudocapacitors. This work demonstrates an ultra-high-capacity, fast-charging, and long-term cycling pseudocapacitor anode via the development of an np-Ag framework and deposition of a thin layer of Fe2O3 on its surface (np-Ag@Fe2O3). The np-Ag@Fe2O3 anode shows a capacitance of similar to 608 F g(-1) at 10 A g(-1), and similar to 84.9% of the capacitance is retained after 6000 charge-discharge cycles. This stable and high-capacity anode, which can be charged within a few tens of seconds, is a promising candidate for next-generation energy storage devices.
Publisher
AMER CHEMICAL SOC
Issue Date
2018-05
Language
English
Article Type
Article
Keywords

ELECTROCHEMICAL ENERGY-STORAGE; SUPERCAPACITOR PERFORMANCE; CARBON ELECTRODES; NANOTUBE ARRAYS; HIGH-POWER; CAPACITORS; NANOSHEETS; ULTRALONG; GRAPHENE; DENSITY

Citation

ACS APPLIED MATERIALS & INTERFACES, v.10, no.20, pp.17223 - 17231

ISSN
1944-8244
DOI
10.1021/acsami.8b03725
URI
http://hdl.handle.net/10203/242622
Appears in Collection
ME-Journal Papers(저널논문)
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