Monocrystalline FeMnO₃ on Carbon Cloth for Extremely High-Areal-Capacitance Supercapacitors

Abstract

Flexible supercapacitors with extremely high areal capacitances are of great significance in wearable electronics. Here, we report fast fabrication of high mass loading monocrystalline FeMnO 3 on highly conductive carbon cloth (CC) textiles within just 1 min through a molten salt route. The heavily loaded (10.7 mg cm −2 ), binder-free FeMnO 3 @CC electrode exhibits a preeminent highest areal capacitance of 11.02 F cm −2 when working as a negative electrode at 2 mV s −1 , thanks to the monocrystalline characteristic and the activated carbon substrate. Because of the multivalence change, it is appropriately applied as electrodes in a symmetric supercapacitor, which operates at an extremely high potential (1.6 V) and achieves outstanding areal performance (capacitance of 3.6 F cm −2 at 10 mA cm −2 , energy density of 1.28 mWh cm −2 at 8.12 mW cm −2 ) as well as excellent gravimetric and volumetric properties. We also record an outstanding cycling stability at 10 mA cm −2 , which is 91% of the first areal capacitance maintained after 20 000 cycles. This study reveals an encouraging application prospect when considering the low-cost, fast-fabrication of supercapacitor electrodes exhibiting merits of high mass loading, hierarchical structure, boosted conductivity, and structural stability.

Fascinating Bifunctional Electrocatalytic Activity via a Mesoporous Structured FeMnO3@ZrO2 Matrix as an Efficient Cathode for Li–O2 Batteries

“…Research into low-cost transition-metal oxides, nitrides, carbides, and sulfides, as substitutes for precious metals, should be beneficial for lowering catalyst costs . For perovskite catalysts, crystallographic flaws and oxygen vacancies caused by the multivalency effect of A and B cations result in the electrocatalytic activity of triple metal oxides (e.g., of the types ABO 3 , ABO 4 , and AB 2 O 4 ) being much greater than that of dual metal oxides. − Engineering oxygen defects into perovskite oxides has been a strategy for improving the sluggish kinetics in LOBs when an appropriate level of oxygen defects can result in quicker transport of electrons and a lower-energy barrier. , Furthermore, oxygen vacancies can function as effective sites for binding Li 2 O intermediate products and decomposing Li 2 O 2 discharged products . In addition, considerable changes in the structural morphology and surface structure can alter the catalytic efficiency .…”

SYNTHESIS AND PHYSICO-CHEMICAL PROPERTIES OF POLYCRYSTAL FeMnO3-Ho3Fe5O12

“…The progress of perovskites as a sensory material for the detection of versatile analyses from the perspective of psychological and pedagogical safety is very important . Much attention in the development of perovskites is paid to the presence of the environmentally benign nature of ABO₃-based variable elements, the abundance of electrochemical properties, the availability of cost, low toxicity and high earth content (Gu, 2020) (Suvina V. K. T., 2020) (Amalraj, 2021). Despite the above advantages, it mainly suffers from insufficient electrical conductivity (Karuppiah C. T. B., 2021) .…”

Electrochemical studies of Ni(OH) 2 , NiO, and Ni 3 S 2 nanostructures on Ni‐foam toward binder‐free positive electrode for hybrid supercapacitor application

“…Therefore, for practical application, the SC electrode having high-mass loading with high utilization of active material, the areal and volumetric performance has been highlighted as essential and ideal. 3,17,18 Electrically conducting 3D porous Ni-foam in electrode design can give a higher specific surface area and a solid mechanical skeleton for the active material; this could provide better contact between the active material and electrolytes. 19,20 Electrodes, designed to have active materials anchored on Ni-foam surface without any polymer binders and conductive additives, would be able to avoid loss in electrical conductivity, enhancing SC performance.…”

“…However, the electrochemical performance of SC electrodes frequently declines fast with increased mass loading of active material due to poor ionic diffusion and reduced electrical conductivity at the electrode surface. Therefore, for practical application, the SC electrode having high‐mass loading with high utilization of active material, the areal and volumetric performance has been highlighted as essential and ideal 3,17,18 …”