NiMoO<sub>4</sub> Nanosheets Embedded in Microflake-Assembled CuCo<sub>2</sub>O<sub>4</sub> Island-like Structure on Ni Foam for High-Performance Asymmetrical Solid-State Supercapacitors
Micro/nano-heterostructure with subtle structural design is an effective strategy to reduce the self-aggregation of 2D structure and maintain a large specific surface area to achieve high-performance supercapacitors. Herein, we report a rationally designed micro/nano-heterostructure of complex terna...
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| Format: | Article |
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MDPI AG
2023-09-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/28/19/6840 |
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| author | Gaofeng Li Lingling Chen Longfei Li |
| author_facet | Gaofeng Li Lingling Chen Longfei Li |
| author_sort | Gaofeng Li |
| collection | DOAJ |
| description | Micro/nano-heterostructure with subtle structural design is an effective strategy to reduce the self-aggregation of 2D structure and maintain a large specific surface area to achieve high-performance supercapacitors. Herein, we report a rationally designed micro/nano-heterostructure of complex ternary transition metal oxides (TMOs) by a two-step hydrothermal method. Microflake-assembled island-like CuCo<sub>2</sub>O<sub>4</sub> frameworks and secondary inserted units of NiMoO<sub>4</sub> nanosheets endow CuCo<sub>2</sub>O<sub>4</sub>/NiMoO<sub>4</sub> composites with desired micro/nanostructure features. Three-dimensional architectures constructed from CuCo<sub>2</sub>O<sub>4</sub> microflakes offer a robust skeleton to endure structural change during cycling and provide efficient and rapid pathways for ion and electron transport. Two-dimensional NiMoO<sub>4</sub> nanosheets possess numerous active sites and multi-access ion paths. Benefiting from above-mentioned advantages, the CuCo<sub>2</sub>O<sub>4</sub>/NiMoO<sub>4</sub> heterostructures exhibit superior pseudocapacitive performance with a high specific capacitance of 2350 F/g at 1 A/g as well as an excellent cycling stability of 91.5% over 5000 cycles. A solid-state asymmetric supercapacitor based on the CuCo<sub>2</sub>O<sub>4</sub>/NiMoO<sub>4</sub> electrode as a positive electrode and activated carbon as a negative electrode achieves a high energy density of 51.7 Wh/kg at a power density of 853.7 W/kg. These results indicate that the hybrid micro/nanostructured TMOs will be promising for high-performance supercapacitors. |
| first_indexed | 2024-03-10T21:39:47Z |
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| publishDate | 2023-09-01 |
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| spelling | doaj.art-6bd8d79cd00046799f9b1a2ae82c0ece2023-11-19T14:46:18ZengMDPI AGMolecules1420-30492023-09-012819684010.3390/molecules28196840NiMoO<sub>4</sub> Nanosheets Embedded in Microflake-Assembled CuCo<sub>2</sub>O<sub>4</sub> Island-like Structure on Ni Foam for High-Performance Asymmetrical Solid-State SupercapacitorsGaofeng Li0Lingling Chen1Longfei Li2Institute of Advanced Energy Storage Technology and Equipment, Faculty of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, ChinaInstitute of Advanced Energy Storage Technology and Equipment, School of Materials Science and Chemcal Engineering, Ningbo University, Ningbo 315211, ChinaInstitute of Advanced Energy Storage Technology and Equipment, School of Materials Science and Chemcal Engineering, Ningbo University, Ningbo 315211, ChinaMicro/nano-heterostructure with subtle structural design is an effective strategy to reduce the self-aggregation of 2D structure and maintain a large specific surface area to achieve high-performance supercapacitors. Herein, we report a rationally designed micro/nano-heterostructure of complex ternary transition metal oxides (TMOs) by a two-step hydrothermal method. Microflake-assembled island-like CuCo<sub>2</sub>O<sub>4</sub> frameworks and secondary inserted units of NiMoO<sub>4</sub> nanosheets endow CuCo<sub>2</sub>O<sub>4</sub>/NiMoO<sub>4</sub> composites with desired micro/nanostructure features. Three-dimensional architectures constructed from CuCo<sub>2</sub>O<sub>4</sub> microflakes offer a robust skeleton to endure structural change during cycling and provide efficient and rapid pathways for ion and electron transport. Two-dimensional NiMoO<sub>4</sub> nanosheets possess numerous active sites and multi-access ion paths. Benefiting from above-mentioned advantages, the CuCo<sub>2</sub>O<sub>4</sub>/NiMoO<sub>4</sub> heterostructures exhibit superior pseudocapacitive performance with a high specific capacitance of 2350 F/g at 1 A/g as well as an excellent cycling stability of 91.5% over 5000 cycles. A solid-state asymmetric supercapacitor based on the CuCo<sub>2</sub>O<sub>4</sub>/NiMoO<sub>4</sub> electrode as a positive electrode and activated carbon as a negative electrode achieves a high energy density of 51.7 Wh/kg at a power density of 853.7 W/kg. These results indicate that the hybrid micro/nanostructured TMOs will be promising for high-performance supercapacitors.https://www.mdpi.com/1420-3049/28/19/6840CuCo<sub>2</sub>O<sub>4</sub>NiMoO<sub>4</sub>heterostructuremicro/nanostructuresolid-state supercapacitor |
| spellingShingle | Gaofeng Li Lingling Chen Longfei Li NiMoO<sub>4</sub> Nanosheets Embedded in Microflake-Assembled CuCo<sub>2</sub>O<sub>4</sub> Island-like Structure on Ni Foam for High-Performance Asymmetrical Solid-State Supercapacitors Molecules CuCo<sub>2</sub>O<sub>4</sub> NiMoO<sub>4</sub> heterostructure micro/nanostructure solid-state supercapacitor |
| title | NiMoO<sub>4</sub> Nanosheets Embedded in Microflake-Assembled CuCo<sub>2</sub>O<sub>4</sub> Island-like Structure on Ni Foam for High-Performance Asymmetrical Solid-State Supercapacitors |
| title_full | NiMoO<sub>4</sub> Nanosheets Embedded in Microflake-Assembled CuCo<sub>2</sub>O<sub>4</sub> Island-like Structure on Ni Foam for High-Performance Asymmetrical Solid-State Supercapacitors |
| title_fullStr | NiMoO<sub>4</sub> Nanosheets Embedded in Microflake-Assembled CuCo<sub>2</sub>O<sub>4</sub> Island-like Structure on Ni Foam for High-Performance Asymmetrical Solid-State Supercapacitors |
| title_full_unstemmed | NiMoO<sub>4</sub> Nanosheets Embedded in Microflake-Assembled CuCo<sub>2</sub>O<sub>4</sub> Island-like Structure on Ni Foam for High-Performance Asymmetrical Solid-State Supercapacitors |
| title_short | NiMoO<sub>4</sub> Nanosheets Embedded in Microflake-Assembled CuCo<sub>2</sub>O<sub>4</sub> Island-like Structure on Ni Foam for High-Performance Asymmetrical Solid-State Supercapacitors |
| title_sort | nimoo sub 4 sub nanosheets embedded in microflake assembled cuco sub 2 sub o sub 4 sub island like structure on ni foam for high performance asymmetrical solid state supercapacitors |
| topic | CuCo<sub>2</sub>O<sub>4</sub> NiMoO<sub>4</sub> heterostructure micro/nanostructure solid-state supercapacitor |
| url | https://www.mdpi.com/1420-3049/28/19/6840 |
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