Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 42, Pages 49952-49963Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c14537
Keywords
flexible devices; high energy density; silver-sputtered; ultrahigh conductivity; asymmetric supercapacitors
Funding
- National Natural Science Foundation of China [51874079, 51674068, 11775226, 51804035]
- Hebei Province Key Research and Development Plan Project [19211302D]
- Natural Science Foundation of Hebei Province [E2018501091]
- Fundamental Research Funds for the Central Universities [N182312007, N2023040, N182304018]
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A new type of flexible electrode material was designed and fabricated based on nanosheet architectures of a Co-Fe alloy coated with ternary metal sulfide composites on silver-sputtered carbon cloth. This material exhibited high specific capacitance and superior rate capability, with potential applications in the field of supercapacitors.
Electrode materials with high conductivities that are compatible with flexible substrates are important for preparing high-capacitance electrode materials and improving the energy density of flexible supercapacitors. Here, we report the design and fabrication of a new type of flexible electrode based on nanosheet architectures of a Co-Fe alloy (FeCo-A) coated with ternary metal sulfide composites (FeCo-Ss) on silver-sputtered carbon cloth. The high conductivity of the flexible substrate and the iron-cobalt alloy skeleton enables good electron transmission through the material. In particular, the outer FeCo-S layer has an average thickness of similar to 30 nm, providing many active sites. This layer also inhibits the oxidation of the alloy. The electrode material is close to 20 nm thick, which limits inaccessible volumes and promotes high utilization of FeCo-alloy@FeCo-sulfide (FeCo-A-S). The additive-free FeCo-A-S electrode has a high specific capacitance of 2932.2 F g(-1) at 1.0 A g(-1) and a superior rate capability. All-solid-state supercapacitors based on these electrodes have a high power density of 8000 W kg(-1) and a high energy density of 46.1 W h kg(-1).
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