1. Achieving a High Areal Capacity with a Binder-Free Copper Molybdate Nanocone Array-Based Positive Electrode for Hybrid Supercapacitors
- Author
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Jae Su Yu, Ramulu Bhimanaboina, Sung Min Cha, and S. Chandra Sekhar
- Subjects
Supercapacitor ,chemistry.chemical_element ,02 engineering and technology ,Electrolyte ,Molybdate ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Copper ,Hydrothermal circulation ,0104 chemical sciences ,Inorganic Chemistry ,chemistry.chemical_compound ,Crystallinity ,Nickel ,chemistry ,Chemical engineering ,Electrode ,Physical and Theoretical Chemistry ,0210 nano-technology - Abstract
Herein, we develop a binder-free copper molybdate nanocone array with a prism-like morphology on nickel foam (Cu3Mo2O9 NCAs/Ni foam) using a single-step hydrothermal method. With an optimal growth time (10 h) under hydrothermal conditions, the prism-like Cu3Mo2O9 NCAs are uniformly decorated on Ni foam with good adhesion and crystallinity. The prepared Cu3Mo2O9 NCAs/Ni foam has been directly used as a binder-free electrode to examine its suitability as a positive electrode in hybrid supercapacitors. In an aqueous 1 M KOH electrolyte, the binder-free Cu3Mo2O9 NCAs/Ni foam showed battery-type behavior with a high areal capacity of 449.5 μAh cm–2 at a discharge current density of 2 mA cm–2 and also exhibited a good cycling stability. In addition, the pouch-type hybrid supercapacitor is assembled using the prism-like Cu3Mo2O9 NCAs/Ni foam as a positive electrode and the activated carbon as a negative electrode in a 1 M KOH electrolyte. The hybrid supercapacitor achieves a maximum cell potential of 1.6 V with ...
- Published
- 2018