Copper Hydroxide Porous Nanotube Arrays Grown on Copper Foils as High-Performance Integrated Electrodes for Supercapacitors

Kang, Jiahui; Sheng, Jiali; Ji, Yaqiang; Wen, Haoran; Fu, Xian‐Zhu; Du, Guoping; Sun, Rong; Wong, Ching‐Ping

doi:10.1002/slct.201701920

Cited by 12 publications

(5 citation statements)

References 48 publications

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“…First, copper(II) hydroxide is extremely superhydrophilic due to the strong polar hydroxide, which is the prerequisite for oil dewetting performance . Second, the preparation method of a copper(II) hydroxide non-directional nanowire is a mature and widely reported technology, − and this structure has significant topographical features for detailed analysis. Finally, the morphology parameters can be controlled by experimental conditions, and this structure can be transformed into other structures with similar morphologies through special treatment, which is convenient for us to conduct a comprehensive study.…”

Section: Resultsmentioning

confidence: 99%

Structure–Activity Relationship between the Superhydrophilic Nanowire Structure and the Oil Dewetting Property

2023

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Materials require specific surface structures to achieve the best performance, but achieving an optimal structural design requires a systematic study of how structure affects performance. In this work, we comprehensively and systematically investigated the structure−activity relationship between the nanowire structure and the oil dewetting self-cleaning performance. It is easy for an oil droplet to enter this structure, but it is difficult for it to escape from the gaps between the structures even under the action of water. So, the oil dewetting ability is greatly reduced, showing that this "easy to enter and difficult to exit" mode is very disadvantageous for oil desorption. Moreover, if the structure is dissolved during the test, the oil dewetting ability will be restored. The desorption effect is affected by structural parameters and reaction conditions, which further verifies the negative effect of this structure. In contrast, copper(II) oxide nanowires completely lose their selfcleaning ability due to the enhancement of hydrophobicity and oleophilicity, and the larger-diameter copper(II) oxalate nanorods exhibit a "difficult to enter and difficult to exit" mode, leading to the partial recovery of the oil dewetting performance. This study helps us deeply understand the influence of the surface microstructure on the oil dewetting performance and lay a solid foundation for further appropriate structural design.

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Section: Resultsmentioning

confidence: 99%

Structure–Activity Relationship between the Superhydrophilic Nanowire Structure and the Oil Dewetting Property

2023

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“…Kang et al discovered that these nanorods are transformed into nanotubes within 30 min of reaction. [103] Besides this insitu oxidation method, Cu(OH) 2 can also be prepared by anodization. The mechanism of Cu(OH) 2 formation is called the "oriented crystal growth", which is analogous to Ni(OH) 2 .…”

Section: Cu-based Materialsmentioning

confidence: 99%

“…Kang et al. discovered that these nanorods are transformed into nanotubes within 30 min of reaction [103] . Besides this in‐situ oxidation method, Cu(OH) 2 can also be prepared by anodization.…”

Section: Transition Metal‐based Self‐supported Nanoarraysmentioning

confidence: 99%

Self‐Supported Transition Metal‐Based Nanoarrays for Efficient Energy Storage

Liu

Chen

et al. 2022

The Chemical Record

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Rechargeable batteries and supercapacitors are currently considered as promising electrochemical energy storage (EES) systems to address the energy and environment issues. Self‐supported transition metal (Ni, Co, Mn, Mo, Cu, V)‐based materials are promising electrodes for EES devices, which offer highly efficient charge transfer kinetics. This review summarizes the latest development of transition metal‐based materials with self‐supported structures for EES systems. Special focus has been taken on the synthetic methods, the selection of substrates, architectures and chemical compositions of different self‐supported nanoarrays in energy storage systems. Finally, the challenges and opportunities of these materials for future development in this field are briefly discussed. We believe that the advancement in self‐supported electrode materials would pave the way towards next‐generation EES.

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“…Moreover, electrodeposition can produce a regular morphology with a large surface area of desired nanostructured materials . Unlike the usual synthesis techniques of forming pure materials without any substrates, growing active materials directly on conductive substrates further facilitates the movement of electrons and ions, thereby increasing the overall electrochemical performance. , Soram et al developed active material Co(OH) 2 nanosheets through electrochemical deposition upon a nickel mesh network coated over a cracked silica template film, which showed an areal capacitance of 15.88 mF cm –2 . Lee et al recently reported double-transition metal hydroxide layers of Co(OH) 2 and Ni(OH) 2 using a two-step electrodeposition route that showed 27.66 mF cm –2 capacitance .…”

Section: Introductionmentioning

confidence: 99%

Room-Temperature Growth of Co(OH)₂ Nanosheets on Nanobelt-like Cu(OH)₂ Arrays for a Binder-Free High-Performance All-Solid-State Supercapacitor

Satpathy

Patnaik

Pradhan

2021

ACS Appl. Energy Mater.

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Herein, a solution-based route is presented to fabricate Cu(OH)2/Co(OH)2 heterostructures directly on copper foil (CF) as a potential electrode material for supercapacitor application. First a CF is etched to form uniform Cu(OH)2 nanobelt-like structures on its surface. Using the same CF as the substrate, Co(OH)2 nanosheets are electrochemically grown on Cu(OH)2 nanobelts to form a Cu(OH)2/Co(OH)2 heterostructure at room temperature. The electrodeposition duration determines the density of Co(OH)2 nanosheets on the substrate. With an electrodeposition duration of 900 s, a maximum areal capacitance is achieved and thus the same duration is used for forming the heterostructure for device fabrication. An areal capacitance of 413 mF cm–2 is obtained for CF/Cu(OH)2/Co(OH)2, which is higher than those for CF/Co(OH)2 (344 mF cm–2) and CF/Cu(OH)2 (44 mF cm–2) at 5 mA cm–2. This demonstrates the direct use of a surface-modified binder-free electrode in supercapacitor applications. A more detailed analysis following Trasatti and Dunn’s method reveals the primary charge storage through the diffusion-controlled process. Additionally, the performance of an asymmetric supercapacitor device is demonstrated with CF/Cu(OH)2/Co(OH)2 as a positive electrode, activated carbon on CF as a negative electrode, and polyvinyl alcohol–KOH gel as the solid-state electrolyte. An areal capacitance of 113 mF cm–2 at 2.5 mA cm–2 is achieved with an energy density of 3.5 × 10–2 mW h cm–2 at a power density of 1.87 mW cm–2 with a 1.5 V voltage window. A capacitance retention of 81% is measured after 12,000 galvanostatic charge–discharge cycles.

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Copper Hydroxide Porous Nanotube Arrays Grown on Copper Foils as High-Performance Integrated Electrodes for Supercapacitors

Cited by 12 publications

References 48 publications

Structure–Activity Relationship between the Superhydrophilic Nanowire Structure and the Oil Dewetting Property

Structure–Activity Relationship between the Superhydrophilic Nanowire Structure and the Oil Dewetting Property

Self‐Supported Transition Metal‐Based Nanoarrays for Efficient Energy Storage

Room-Temperature Growth of Co(OH)₂ Nanosheets on Nanobelt-like Cu(OH)₂ Arrays for a Binder-Free High-Performance All-Solid-State Supercapacitor

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Copper Hydroxide Porous Nanotube Arrays Grown on Copper Foils as High-Performance Integrated Electrodes for Supercapacitors

Cited by 12 publications

References 48 publications

Structure–Activity Relationship between the Superhydrophilic Nanowire Structure and the Oil Dewetting Property

Structure–Activity Relationship between the Superhydrophilic Nanowire Structure and the Oil Dewetting Property

Self‐Supported Transition Metal‐Based Nanoarrays for Efficient Energy Storage

Room-Temperature Growth of Co(OH)2 Nanosheets on Nanobelt-like Cu(OH)2 Arrays for a Binder-Free High-Performance All-Solid-State Supercapacitor

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Room-Temperature Growth of Co(OH)₂ Nanosheets on Nanobelt-like Cu(OH)₂ Arrays for a Binder-Free High-Performance All-Solid-State Supercapacitor