Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 20, Pages 17223-17231Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b03725
Keywords
nanoporous silver; silver halide; electroreduction; pseudocapacitor; iron oxide
Funding
- Basic Science Research Program - National Research Foundation (NRF) under the Ministry of Science [2015R1A2A1A05001840, 2018R1A2B6007500]
- BK 21 Plus Program - National Research Foundation (NRF) under the Ministry of Science
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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.
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