Electrochemical performance of zinc carbodiimides based porous nanocomposites as supercapacitors

Abstract

The low energy densities of supercapacitors are generally limited by the used anodes. To develop supercapacitors with high energy densities, metal-organic framework (TRD-ZIF-8) derived honeycomb-like porous zinc carbodiimide (ZnNCN) based nanocomposites (HPZC) surface loaded with graphitized carbon nitride (g-C 3 N 4 ) are synthesized. After their detailed characterization by means of electron microscopy, spectroscopy and electrochemical techniques, the materials are used to prepare asymmetric supercapacitor cells (HPZC-4//AC ASCs) with HPZC-4 and active carbon as electrodes, which demonstrate power and energy densities as high as 7839 W Kg − 1 and 213 Wh Kg − 1 , respectively. The unique honeycomb-like porous structure of HPZC loaded with a 2D material (g-C 3 N 4 ) improves charge/mass transport efficiency and reduces ion diffusion resistance, contributing to a specific capacitance of 779 F g − 1 at a current density of 3 A g − 1 . The study thus presents a new way to design transition metal carbodiimide materials and assesses their potential application as electrodes in asymmetric supercapacitors.

Heteroatom-doped microporous carbon nanosheets derived from pentaerythritol-melamine for supercapacitors and CO2 capture

“…In addition, MEL contributes to the formation of the porous structure by acting as a self-sacrifice agent and an etchant [35]. The intriguing interaction between MEL and carbon precursors have also been reported by other researchers, including Ji et al [35] and Meng et al [36].…”

“…At the same time, the melem from MEL and the conjugated double bonds from the decomposition of PER undergo a Diels-Alder reaction to form nitrogen doped polyaromatic structures [33,34]. In addition, MEL contributes to the formation of the porous structure by acting as a self-sacrifice agent and an etchant [35]. The intriguing interaction between MEL and carbon precursors have also been reported by other researchers, including Ji et al [35] and Meng et al [36].…”

Metal Cyanamides/Carbodiimides: Structure, Synthesis and Electrochemical Energy Storage Performance

“…Ji 课题组 [63] 报道了氰胺锌和石墨相氮化碳复合物 (ZnNCN/C3N4)用作水系超级电容器的电极材料， 组装的非对称型超级电容器具有较高的能量密度 (213 Wh/kg)； Yuan 等 [64] [60] Colourful figures are available on website…”

Recent Advances in Immunosafety and Nanoinformatics of Two-Dimensional Materials Applied to Nano-imaging

“…The number of publications of 2D materials and their applications is growing, in which nano-imaging and drug release systems stand out and are present mostly in the health sector ( Figures 2B, D ) . For energy application, the structural and electronic properties of 2D materials have been shown to improve the energy accumulation in devices such as lithium-ion, metal-air batteries (LIBs) ( 9 , 39 , 49 , 50 ) and electrochemical devices ( 51 , 52 ). Moreover, these 2D materials are of particular interest as catalysts and nanoscale substrates, replacing transition, or noble metals normally used to catalyze an acid-basic reaction, producing metal free-catalysts ( 53 , 54 ).…”