Binder-free Mn–V–Sn oxyhydroxide decorated with metallic Sn as an earth-abundant supercapattery electrode for intensified energy storage

Abstract

The integration of battery and capacitor merits in one device would achieve the best energy storage performance. However, this is yet to be realized due to the shortage in identifying...

Compositionally variant bimetallic Cu–Mn oxysulfide electrodes with meritorious supercapacitive performance and high energy density

“…This is due to the reaction between KOH and the fabricated oxysulfide electrodes, which undergo the following redox transitions: Cu + /Cu 2+ and Mn 3+ /Mn 4+ states according to eqn (6)–(8). 33,66–68 The redox reaction mechanism of metal sulfides is similar to that of metal oxides in an alkaline electrolyte as the oxygen and sulfur elements are in the same group in the periodic table. 69 Cu 2 O + 2OH − ↔ 2CuO + H 2 O + e − Mn(OH) 2 + OH − ↔ MnOOH + H 2 O + e − MnOOH + OH − ↔ MnO 2 + H 2 O + e − …”

Optimized Synthesis of Nanostructured Trimetallic Mn–V–Fe Selenides with Battery-Type Behavior for High-Performance Hybrid Supercapacitors

“…Meanwhile, GCD measurement was performed within the 0–0.4 V versus Hg/HgO potential window. The areal capacitance ( C s , mF cm –2 ) at variable current densities was calculated using eq , as the discharge curves follow nonlinear behavior. C normals = 2 I true∫ V normald t A · normalΔ V 2 Here, I represents the discharging current, Δ V is the potential window, ∫ V d t gives the area under the discharge curve, and A is the area of the deposited active material on NF. Moreover, the EIS scans were recorded in low- and high-frequency regimes ranging from 0.1 Hz to 10 kHz.…”

“…Meanwhile, GCD measurement was performed within the 0−0.4 V versus Hg/HgO potential window. The areal capacitance (C s , mF cm −2 ) at variable current densities was calculated using eq 1 34,35 as the discharge curves follow nonlinear behavior.…”

Compositionally Tunable Mn–V–Fe Phosphoselenide Nanorods with Minimal Ion-Diffusion Barrier as High Energy Density Battery Electrode Materials

“…Henceforth, one of the most promising research areas is the investigation of highly conducting electrode materials with high surface area, nontoxicity, and cost-effectiveness. To this end, transition metal-based compounds are common electrode materials due to their multiple valence states that lead to fast faradaic redox reactions. , Among them, transition metal phosphides (TMP) have received utmost interest as a battery-like electrode material owing to their semimetallic properties, high electrical conductivity, and low electronegativity. , Besides, TMP possesses an open chemical structure that facilities the intercalation and diffusion of electrolyte ions into the active material, which leads to rise both PD and storage capacity . Nonetheless, TMPs suffer from sluggish reaction kinetics and volume variation upon repeated cycling, which makes the capacity drastically decrease, morphology change, and low rate capability …”