Simultaneous Electrodeposition of Ternary Metal Oxide Nanocomposites for High-Efficiency Supercapacitor Applications

Abstract

Complex oxides and hydroxides of Ni, Co, and Mn from a precursor mixture were electrochemically deposited on both a cathode and an anode. On the Ni foam cathode, the complex metal hydroxides precipitated as nanolayers at −0.9 V. Simultaneously, the metal ions were oxidized and deposited as blocks on the Ni foam anode. While the concentrations of Ni(NO 3 ) 2 and Mn(NO 3 ) 2 were constant (80 mM for Ni 2+ and 40 mM for Mn 2+ , respectively), the concentration of Co(NO 3 ) 2 was varied from 20 to 120 mM, which affected the morphology and electrochemical properties of the electrode: a Co:Ni:Mn molar ratio resulted in the highest specific capacitance (at a scan rate of 5 mV s –1 , 1800 F g –1 for the cathode material and 720 F g –1 for the anode material). This cathode material was assembled into symmetric supercapacitors, which demonstrated an excellent energy density of 39 Wh kg –1 at a power density of 1300 W kg –1 and a high capacitance retention of 90% after 3000 charge/discharge cycles. This high electrochemical performance was attributed to the optimized ratio of metal oxides, and this simple preparation strategy can be applied to other nanocomposites of complex metal oxides/hydroxides with desired characteristics for various applications.

Commercially Accessible High-Performance Aluminum-Air Battery Cathodes through Electrodeposition of Mn and Ni Species on Fuel Cell Cathodes

“…This is also related to the observation of a high concentration of H + generated around the glassy carbon during the nickel deposition. On the one hand, this effect allows the nickel electrodeposition on the fuel cell electrode to generate a rich OH − environment (nitrate ions (NO 3 − ) are reduced to produce hydroxide ions (OH − ), which reacts with Ni 2+ ions to form metal hydroxides [30]). On the other hand, it produces the partial reaction of nickel with the carbonaceous electrode [31].…”

Hydrothermally Grown SnO 2 and SnO 2 /rGO Nanocomposite and Its Physio-Electrochemical Studies for Pseudocapacitor Electrode Applications

“…The electrochemical properties of the synthesized SnO 2 and SnO 2 /rGO nanocomposite samples were measured by using 3 M KOH aqueous electrolyte solution in a three-electrode system. The capacitive behavior of electrode materials is commonly investigated by cyclic voltammetry measurements [26,27].…”

Effects of Nanocomposite Derivatives of Ni–Fe, Ni–Co, Ni–Co–Fe Prussian Blue Analogues on the Thermal Decomposition Performance of Nitrocellulose

“…Prussian blue (PB), as a typical metal–organic framework (MOF) material, has received wide attention in recent years due to its low cost, simple preparation process, and unique hollow framework structure. , Using these advantages, PB-derived nanomaterials gain distinctive qualities that make them highly desirable in a range of applications. In particular, nanocatalysts, due to their small particle size, large surface area, and high catalytic activity, have become a hot topic in explosive research. − MOFs can form in situ metal (metal oxide)–carbon-based complexes with combustion catalytic activity during the combustion process of explosives . However, the combustion process is inherently uncontrollable, making it difficult to control the structural characteristics of the formed catalysts and adjust their catalytic activity.…”