Journal
APPLIED SURFACE SCIENCE
Volume 467, Issue -, Pages 104-111Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2018.10.093
Keywords
Ultrathin Au/graphene composite electrode; Flexible; Transparent; Supercapacitor
Categories
Funding
- National Key Research and Development Program of China
- National Natural Science Foundation of China (NSFC) [2017YFB0404500, 61675085, 61505065, 61705075, 61605056]
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Large-area monolayer graphene by chemical vapor deposition as electrode in electronic devices always suffers from shortages of low conductivity and high contact resistance. In this work, we demonstrate a composite electrode by depositing a continuous and homogeneous ultrathin 7-nm Au film on monolayer graphene with low average sheet resistance of 24.6 Omega/square and high transmittance of 74.6% at 520 nm. The excellent properties of the composite electrode are attributed to the suppressed Au Volmer-Weber growth mode of the ultrathin Au film by the organized hexagonal carbon lattices of graphene. Rigid supercapacitor based on the composite electrode exhibits a capacitance of 81.5 mu F/cm(2) at the scan rate of 0.1 V/s, which is 17 times higher than the device based on monolayer graphene. Flexible supercapacitor based on the composite electrode can be bending at curvature radius of 2 mm and with slight performance decrease over 1800 bending cycles.
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