3D self-supported hierarchical NiCo architectures with integrated capacitive performance and enhanced electronic conductivity for supercapacitors

YanRu Tang and Baohai Cheng

Energy, 2016, vol. 112, issue C, 755-761

Abstract: 3D self-supported hierarchical Ni and Co co-hydroxide architectures are promising electrode materials for supercapacitor application attributed to their prominent properties such as binder-free electrode fabrication process and high power density. However, the intrinsic conductivity of Ni and Co co-hydroxide is poor. How to develop a new type of supercapacitors exhibiting enhanced electronic conductivity and involving pseudocapacitive performance and electric double-layer capacitive performance is still challenging. Herein, we present a facile co-electrodeposition method to fabricate self-standing NixCo2x(OH)y@Ni/ITO monolithic electrode by growing a layer of NixCo2x(OH)y with layered structure on surface of conductive Ni nanotube, which increases specific surface area and prompts fast ion adsorption/de-adsotption (electrochemical double layer capacitance performance) and fast surface redox reactions (pseudo-capacitance performance). With the conductive Ni nanotube as current collector and electronic conductor, the binder-free NixCo2x(OH)y@Ni/ITO electrode exhibits high specific capacitance (92.4 mF cm−2 at 0.1 mA cm−2, the mass of active material per cm−2 is typically in 100 s μg). Moreover, NixCo2x(OH)y@Ni/ITO hybrids display excellent cycling stability with 93.3% capacitance retention after 5000 cycles. The results suggest NixCo2x(OH)y@Ni/ITO nanostructure constructed based on integrated features of pseudocapacitive performance and electric double-layer capacitive performance and enhanced electronic conductivity is expected to be a type of excellent electrode material for supercapacitor.

Keywords: Binder free; Hierarchical NixCo2x(OH)y@Ni/ITO architectures; Conductive Ni nanotube; Nanosheet; Supercapacitor (search for similar items in EconPapers)
Date: 2016
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:112:y:2016:i:c:p:755-761

DOI: 10.1016/j.energy.2016.06.104

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