Achieving a High Areal Capacity with a Binder-Free Copper Molybdate Nanocone Array-Based Positive Electrode for Hybrid Supercapacitors

作者：Cha Sung Min; Sekhar S Chandra; Bhimanaboina Ramulu; Yu Jae Su^*

来源：Inorganic Chemistry, 2018, 57(14): 8440-8450.

DOI：10.1021/acs.inorgchem.8b01119

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 mu Ah 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 superior energy storage properties, including a high areal capacitance of 609.7 mF cm(-2) at 3.S mA cm(-2), a high areal energy (0.21 mWh cm(-2)), and a high power density (2.73 mW cm(-2)). The obtained results suggest that the facilely synthesized Cu3Mo2O9 NCAs/Ni foam electrode has great potential in high-performance energy storage devices.

• 出版日期2018-7-16