Ultrasonic and NH4+ assisted Ni foam substrate oxidation to achieve high performance MnO2 supercapacitor

In Situ Grown MnO2 Nanoflower Arrays on Ni Foam (MnO2@NF) as 3D Lithiophilic Hosts for a Stable Lithium Metal Anode

“…In the high-resolution XPS spectrum of Mn 2p (Figure g), two peaks appearing at 641.9 and 653.6 eV with an energy difference of 11.7 eV are related to Mn 2p 3/2 and Mn 2p 1/2 , which indicates that manganese exists in the chemical state of Mn 4+ . , The high-resolution of O 1s spectrum (Figure h) can be divided into two fitting peaks at 529.7 and 531.2 eV. The peak located at 529.7 eV is relevant to the metal oxide banding configurations, and the peak at 531.2 eV can be attributed to the OH – or absorbed oxygen. − From the above characterization, it is well proved that amorphous MnO 2 nanoflower array is successful synthesized on the surface of NF skeleton. In addition, the molten Li wettability experiments were further carried out to intuitively certify the lithiophilicity of different electrodes (Figure S7).…”

“…Figure 4b, c shows that for the plating/stripping curves of two electrodes at different current densities from 0.5 to 10 mA cm −2 , the polarization voltage of MnO 2 @NF (21, 28, 41, 78, 145 mV) is significantly lower than that for NF (27,37,56, 105, 167 mV), indicating that MnO 2 @NF has a lower interface impedance as a result of uniform Li plating/stripping. Meanwhile, CE tests were also measured by the Aurbach method on Li//NF and Li//MnO 2 @NF half cells.…”

“…In the high-resolution XPS spectrum of Mn 2p (Figure 1g), two peaks appearing at 641.9 and 653.6 eV with an energy difference of 11.7 eV are related to Mn 2p 3/2 and Mn 2p 1/2 , which indicates that manganese exists in the chemical state of Mn 4+ . 36,37 The high-resolution of O 1s spectrum (Figure 1h) can be divided into two fitting peaks at 529.7 and 531.2 eV. The peak located at 529.7 eV is relevant to the metal oxide banding configurations, and the peak at 531.2 eV can be attributed to the OH − or absorbed oxygen.…”

Preparation of Eco-Friendly High-Performance Manganese Dioxide Supercapacitors by Linear Sweep Voltammetry

“…For 15 min, Nickel foam (110 PPI, 1 mm thickness, 350 g m −2 , 1.0 × 1.5 cm −2 ) was submerged in a solution of hydrochloric acid, ethanol, and deionized water to remove any oxides or impurities from the substrate surface [32]. After drying, they were weighed, and their weights were recorded.…”

Growth of Flower-like MnO2 on Porous ZIF-67 for Achieving Enhanced Supercapacitive Properties

“…Efficient, sustainable, and inexpensive energy storage devices have received considerable attention due to the explosive growth in demand for portable electronic devices, high-power industrial equipment, and hybrid electric vehicles. − Among the various emerging energy storage devices, supercapacitors (SCs) have attracted extensive interest due to their high power density, rapid charging capability, excellent lifespan, low fabrication cost, and so forth. , The capacitance of SCs mainly originates from the electrical double layer capacitance related to ion adsorption/desorption at the electrode/electrolyte interface, and pseudocapacitance associated with reversible redox reactions, or intercalation/deintercalation of electrolyte ions (Li + , Na + , K + , or H 3 O + ) in bulk active materials. , Compared with electrical double layer capacitors (EDLCs), pseudocapacitors could provide higher specific capacitance and energy density, although the disadvantages include poor cycle stability and rate capability. , To promote the practical applications of capacitors, the development of high-performance electrode materials, especially pseudocapacitive ones, with excellent cycle stability and satisfactory rate capability is quite important.…”