A general strategy for the fabrication of high performance microsupercapacitors
Name:
1-s2.0-S2211285515002475-main.pdf
Size:
3.072Mb
Format:
PDF
Description:
Accepted Manuscript
Name:
1-s2.0-S2211285515002475-fx1.jpg
Size:
23.93Kb
Format:
JPEG image
Description:
Graphical abstract
Type
ArticleKAUST Department
Functional Nanomaterials and Devices Research GroupMaterial Science and Engineering Program
Physical Science and Engineering (PSE) Division
Date
2015-06-06Online Publication Date
2015-06-06Print Publication Date
2015-09Permanent link to this record
http://hdl.handle.net/10754/556515
Metadata
Show full item recordAbstract
We propose a generic strategy for microsupercapacitor fabrication that integrates layers of reduced graphene oxide (rGO) and pseudocapacitive materials to create electrode heterostructures with significantly improved cycling stability and performance. Our approach involves a combination of photolithography and a simple transfer method of free-standing reduced graphene oxide film onto an Au/patterned photoresist bilayer. The resulting stack (rGO/Au/patterned resist/substrate) is then used for the electrochemical deposition of various pseudocapacitive materials before the final step of lift-off. To prove the viability of this method, we have successfully fabricated microsupercapacitors (MSCs) with the following interdigitated electrode heterostructures: MnO2/rGO, Co(OH)2/rGO and PANI/rGO. These MSCs show better performance and cycling stability compared to the single layer, (i.e., rGO-free) counterparts. The interdigitated electrode heterostructures result in MSCs with energy densities in the range of 3–12 mW h/cm3 and power densities in the range of 400–1200 mW/cm3, which is superior to the Li thin film batteries (E=10 mW h/cm3), carbon, and metal oxide based MSCs (E=1–6 mW h/cm3) while device energy densities are in the range of 1.3–5.3 mW h/cm3, corresponding power densities are in the range of 178–533 mW/cm3. These results can be explained by a facilitated nucleation model, where surface topology of the rGO film creates a favorable environment for the nucleation and growth of pseudocapacitive materials with strong interfacial contacts and enhanced surface area. This approach opens up a new avenue in fabricating MSCs involving a variety of heterostructures combining electrical double layer carbon type with Faradaic pseudocapacitive materials for enhanced electrochemical performance.Citation
A general strategy for the fabrication of high performance microsupercapacitors 2015 Nano EnergyPublisher
Elsevier BVJournal
Nano EnergyAdditional Links
http://linkinghub.elsevier.com/retrieve/pii/S2211285515002475ae974a485f413a2113503eed53cd6c53
10.1016/j.nanoen.2015.05.031