Engineering Architecture of 3D-Urchin-like Structure and 2D-Nanosheets of Bi₂S₃@g-C₃N₄ as the Electrode Material for a Solid-State Symmetric Supercapacitor

Abstract

In this work, uniform hierarchical mesoporous 3D-urchin-like Bi2S3@2D-nanosheet g-C3N4 was synthesized via a superficial hydrothermal method. The prepared pristine Bi2S3, g-C3N4, and 3D-Bi2S3@2D-g-C3N4 composite samples were extensively studied for their electrochemical performance and exhibited superior battery-type behaviors. The results highlight that the optimized 3D-Bi2S3@2D-g-C3N4 composite sample exhibits a high areal capacity of 41.53 μA h/cm2 at 1 mA/cm2 and a good rate capability of 62.77% along with a remarkable capacity retention of 94.86% after 5000 cycles. The improved performance can be attributed to the good beneficial features of the synergistic effect, mesoporous structure, and lower dissolution. It offers a higher specific surface area, enriches electroactive sites, increases electronic/ionic conductivities, and reduces the interfacial resistance. Furthermore, the solid-state symmetric supercapacitors (SSCs) were assembled by two similar electrodes of 3D-Bi2S3@2D-g-C3N4 sandwiched between the KOH and PVA gel electrolyte. The fabricated SSC device provides a high areal capacity of 25.40 μA h/cm2 at 1 mA/cm2. Furthermore, the SSC delivers a maximum power density of 1495 μW/cm2 and an energy density of 3.17 μW h/cm2 with a good cyclic retention of 83.84% after 7500 cycles. This work also demonstrates the practical applicability of realizing red-light-emitting diodes by interconnecting two SSCs in series.

Well-Designed Construction of Yttrium Orthovanadate Confined on Graphitic Carbon Nitride Sheets: Electrochemical Investigation of Dimetridazole

“…In this work, we report the formation of ellipsoid-like YVO 4 nanoparticles entrapped in CN for improved electrochemical determination of DMZ. In agreement with literature, graphitic CN is a 2D polymeric semiconductor having a band gap of ∼2.7 eV that kindles the electrochemical sensing field to higher succeeding levels owing to its economic fabrication, high conductivity, biocompatibility, short-diffuse distance, highly exposed active sites, large surface area, rapid electron transfer, and thermal stability. , The appearance of sp 2 -hybridized nitrogen in CN layers acts as a channel for electron transfer via free electron pairs and can significantly tune the functions and properties of materials of interest. − …”

“…The investigation of the elemental status and the surface chemistry in the fabricated YVO 4 @CN nanocomposite is carried out by X-ray photoelectron spectroscopy (XPS). The XPS survey spectrum of YVO 4 @CN recommends that the nanocomposite consists of C 1s, N 1s, Y 3d, V 2p, and O 1s elements (Figure a). ,,, The high-resolution spectrum of Y 3d includes peaks at 157.2 eV (Y 3d 5/2 ) and 159.2 eV (Y 3d 3/2 ), which are distinctive of the spin orbit states constituting Y 3+ (Figure b). The spin–spin orbit components, V 2p 3/2 and V 2p 1/2 , are clearly envisaged by the binding energy peaks at 517.5 and 524.6 eV, respectively (Figure c).…”

Heterostructured Ov‐Mn2O3@Cu2SnS3@SnS Composite as Battery‐Type Cathode Material for Extrinsic Self‐Charging Hybrid Supercapacitors

“…The CV, GCD, and EIS (frequency range: 1 mHz to 100 kHz with an applied potential of 5 mV) analyses were performed at RT. The specific capacity ( Q sc , mA h g −1 ) of the prepared electrodes were estimated by the following Equation () [ 46,47 ] where Q sc is the specific capacity (mA h g −1 ), I is the applied current (A), Δ t is the discharge time (s), and m is the mass of coated material (g), respectively.…”

“…The CV, GCD, and EIS (frequency range: 1 mHz to 100 kHz with an applied potential of 5 mV) analyses were performed at RT. The specific capacity (Q sc , mA h g −1 ) of the prepared electrodes were estimated by the following Equation (12) [46,47] 3.6 mA h g sc 1…”

MnCo2O4 Microflowers Anchored on P-Doped g-C3N4 Nanosheets as an Electrocatalyst for Voltammetric Determination of the Antibiotic Drug Sulfadiazine

“…P-doped CN nanosheets (P-CN) were prepared by a direct thermal polycondensation process (Scheme 1, top). 34 The typical preparation process is given in the Supporting Information.…”