Al Foil-Supported Carbon Nanosheets as Self-Supporting Electrodes for High Areal Capacitance Supercapacitors

Abstract

Self-supporting electrode materials with the advantages of a simple operation process and the avoidance of the use any binders are promising candidates for supercapacitors. In this work, carbon-based self-supporting electrode materials with nanosheets grown on Al foil were prepared by combining hydrothermal reaction and the one-step chemical vapor deposition method. The effect of the concentration of the reaction solution on the structures as well as the electrochemical performance of the prepared samples were studied. With the increase in concentration, the nanosheets of the samples became dense and compact. The CNS-120 obtained from a 120 mmol zinc nitrate aqueous solution exhibited excellent electrochemical performance. The CNS-120 displayed the highest areal capacitance of 6.82 mF cm−2 at the current density of 0.01 mA cm−2. Moreover, the CNS-120 exhibited outstanding rate performance with an areal capacitance of 3.07 mF cm−2 at 2 mA cm−2 and good cyclic stability with a capacitance retention of 96.35% after 5000 cycles. Besides, the CNS-120 possessed an energy density of 5.9 μWh cm−2 at a power density of 25 μW cm−2 and still achieved 0.3 μWh cm−2 at 4204 μW cm−2. This work provides simple methods to prepared carbon-based self-supporting materials with low-cost Al foil and demonstrates their potential for realistic application of supercapacitors.

Synthesis and Characterization of Advanced Inorganic Nanomaterials for Energy Storage Devices

“…Supercapacitors, renowned for their high power density and rapid charge-discharge kinetics, also stand to gain from the integration of advanced nanomaterials with tailored surface chemistry and porosity. Transition metal oxides (e.g., ruthenium oxide, manganese dioxide) and conducting polymers (e.g., polyaniline, polypyrrole) represent leading candidates for electrode materials in supercapacitors, offering high specific capacitance and robust cycling stability [7]. The advent of hybrid nanostructures, combining the merits of multiple material components, further enhances the performance of supercapacitors by synergistically optimizing charge storage mechanisms and electrochemical kinetics.…”

Recent Breakthroughs in Supercapacitors Boosted by Macrocycles

“…As a primary energy storage device, supercapacitors (SCs) exhibit excellent properties, such as high energy and power densities, high cycle life, fast charge-discharge rates, environmental benignity, and low maintenance costs. [3][4][5][6][7] They have become a leading choice for storing clean energy. SCs performance is defined by electrochemical double-layer capacitors (EDLCs) with physical charge accumulation and pseudocapacitance with Faradaic charge transfer.…”

Nanosheet‐like MoO3 and conductive PANI electrodeposited on flexible carbon cloth for self‐supported solid‐state supercapacitor electrode

“…But the use of conductive adhesive in the preparation process often reduces the porosity and utilization of the active material, resulting in lower ion penetration and capacitance. 11,12 Therefore, the flexible, self-supported and binder-free electrode materials with good electrochemical performances have received much attention. 13 Metallic substances 14 and carbonaceous materials 15 possess high electrical conductivity and are often chosen as substrates to preparation of selfsupported electrodes.…”

“…Well‐knowingly, the electrodes of traditional supercapacitors are fabricated by coating the active material onto the collector using conductive adhesive due to the limited device design. But the use of conductive adhesive in the preparation process often reduces the porosity and utilization of the active material, resulting in lower ion penetration and capacitance 11,12 . Therefore, the flexible, self‐supported and binder‐free electrode materials with good electrochemical performances have received much attention 13 .…”