Journal
ACS APPLIED ENERGY MATERIALS
Volume 3, Issue 4, Pages 3692-3703Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c00150
Keywords
in-plane asymmetric microsupercapacitors; 2D hybrid nanostructures; metal oxyhydroxide (MOOH) nanosheets; CuSe nanosheets; flexibility
Funding
- National Natural Science Foundation of China [21671106, 21671170, 21541007]
- Fundamental Research Funds for the Central Universities [2018B19714, 2019B44914]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University
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Two-dimensional transition metal oxyhydroxide (MOOH) nanostructures show great potential for application in catalysis, sensing, secondary batteries, and supercapacitors fields. Nonetheless, it is still a challenge to orient and hybridize MOOH nanosheets with carbon-free conductive materials (e.g., CuSe), and their uses in flexible inplane asymmetric microsupercapacitors (AMSCs) are not explored. Herein, vertically oriented CuSe@FeOOH and CuSe@MnOOH hybrid nanosheet frameworks are alternately integrated on Au interdigital electrodes/polyethylene terephthalate substrate through a successive electrodeposition strategy without any template. Because of the unique geometric motifs and composition combination, those hybrid nanosheets frameworks exhibit greatly enhanced specific capacitance (543.9 F g(-1) for CuSe@ FeOOH, 422.9 F g(-1) for CuSe@MnOOH). An in-plane AMSCs (CuSe@FeOOH//CuSe@MnOOH) is directly assembled by using poly(vinyl alcohol)-LiCl gel as the electrolyte. The as-fabricated AMSCs manifests large areal capacitance (20.47 mF cm(-2)), remarkable cycle stability (95% remained after 32 000 cycles), excellent flexibility and mechanical stability. Moreover, it also exhibits a high volumetric energy density of 16.0 mW h cm(-3) and a power density of 1299.4 mW cm(-3), outperforming most recently reported in-plane microsupercapacitors. This work may promote the development of MOOH-based two-dimensional heteronanostructures and accelerate their applications in flexible energy storage or other clean energy fields.
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