Low cost flexible 3-D aligned and cross-linked efficient ZnFe₂O₄ nano-flakes electrode on stainless steel mesh for asymmetric supercapacitors

Abstract

3-D ZnFe2O4/FSSM-300 nano-flakes on flexible stainless steel mesh as anode and Ni(OH)2/FSSM-300 as cathode was used to fabricate an asymmetric supercapacitor.

Comparative Study of Individual and Mixed Aqueous Electrolytes with ZnFe2O4 Nano–flakes Thin Film as an Electrode for Supercapacitor Application

“…Figure (a‐d) shows SEM images of ZnFe 2 O 4 nano‐flakes based electrode (viewed from the top) at different magnification revealing morphological features of the ZnFe 2 O 4 nano‐flakes on stainless steel substrate . The ZnFe 2 O 4 nano‐flakes thin film (1 μm thickness, calculated using weight difference method) standing on the stainless steel support are interconnected with each other forming an ordered array with an open network.…”

Utilizing Waste Thermocol Sheets and Rusted Iron Wires to Fabricate Carbon–Fe3O4 Nanocomposite‐Based Supercapacitors: Turning Wastes into Value‐Added Materials

“…Due to its hierarchical porouss tructure, which facilitates fast electrolytic ion transfer ands trong interconnected morphology, the CÀFe 3 O 4 composite shows ah igh specific capaci- tance of 697 Fg À1 ,e ven at ah igher current density of 30 Ag À1 ; this indicates its high rate performance. [8] The highest frequency,n amely,t he starting point, of the Warburg line for the CÀFe 3 O 4 composite electrode is 50 Hz, which is significantly highert han those of pure Fe 3 O 4 (5.5 Hz) and pure carbon (9.0 Hz);t his indicatese xcellent capacitive response of the CÀ Fe 3 O 4 composite electrode. Furthermore,f ast ion transfer in the CÀFe 3 O 4 composite electrode can be confirmed by Nyquists plots (Figure 4d)r ecorded from 0.01 to 50 000 Hz at open-circuit potential.…”

“…The ability to store/delivere nergy at high current densities is the most advantageous property of SCs over that of batteries. [8] In addition, it has as maller Warburg resistance (R w ;4 .2 W)a nd aW arburg line with am uch higher slope, which indicates fast iont ransfer. Pure Fe 3 O 4 and pure carbon instead show only capacitances of 108 and 180 Fg À1 , respectively,a t3 0Ag À1 (Figure 4c).…”

“…[2,3] Pseudocapacitors, in which charges torage is achieved through Faradic redox reactions, provide significantly highere nergy densities, but usually suffer from lower cyclic stability. [4,5] Typical ASCs incorporate electrodes fabricated with iron-containing oxides (such as Fe 2 O 3 ,F e 3 O 4 ,Z nFe 2 O 4 ,a nd NiFe 2 O 4 )a se lectrode mate-rials, [6][7][8][9] which show high capacitance and energy density values, butthese metal oxidesusually have poor electrical conductivity anda re hydrophobic in nature. [4,5] Typical ASCs incorporate electrodes fabricated with iron-containing oxides (such as Fe 2 O 3 ,F e 3 O 4 ,Z nFe 2 O 4 ,a nd NiFe 2 O 4 )a se lectrode mate-rials, [6][7][8][9] which show high capacitance and energy density values, butthese metal oxidesusually have poor electrical conductivity anda re hydrophobic in nature.…”

Metal Oxide and Hydroxide–Based Aqueous Supercapacitors: From Charge Storage Mechanisms and Functional Electrode Engineering to Need‐Tailored Devices

“…[123] For example, a ZnFe 2 O 4 /stainless steel mesh||Ni(OH) 2 /stainless steel mesh cell in which both electrode have well-defined redox peaks was recently assembled [124] in a working voltage window of 1.6 V. The cell delivered energy density of 42 Wh kg −1 at power density of 5 kW kg −1 and retained 83% of initial capacity after 8000 cycles. Probably, fast Faradaic redox reactions at each electrode, or the formation of composites with carbon-based materials, enabled these well-matched electrochemical responses.…”