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

作者：Tang, YanRu; Cheng, Baohai^*

来源：Energy, 2016, 112: 755-761.

DOI：10.1016/j.energy.2016.06.104

• Binder free
• Hierarchical NixCo2x(OH)(y)@Ni/ITO
• architectures
• Conductive Ni nanotube
• Nanosheet
• Supercapacitor

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 mu g). 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.

• 出版日期2016-10-1
• 单位长春师范大学