B, N Dual Doped Coral-Like Carbon Framework With Superior Pseudocapacitance and Surface Wettability

Abstract

Carbon-based materials are usually considered as conventional electrode materials for supercapacitors (SCs), therefore it is meaningful to enhance supercapacitive capacity and cycling stability via rational surface structure design of carbon-based materials. The bio-inspired coral-like porous carbon structure has attracted much attention recently in that it can offer large surface area for ion accommodation and favor ions-diffusion, promoting its energy storage capacity. Herein, we designed a superiorly hydrophilic B, N dual doped coral-like carbon framework (BN-CCF) and studied its surface wettability via low-field nuclear magnetic resonance relaxation technique. The unique coral-like micro-nano structure and B, N dual doping in carbon framework can enhance its pseudocapacitance and improve surface wettability. Therefore, when used as electrodes of SCs, the BN-CCF displays 457.5 F g−1 at 0.5 A g−1, even when current density increases 20 folds, it still exhibits high capacitance retention of 66.1% and superior cycling stability. The symmetrical SCs assembled by BN-CCF electrodes show a high energy density of 14.92 Wh kg−1 (600 W kg−1). In this work, simple structural regulation with B, N dual doping and surface wettability should be considered as effective strategy to enhance energy storage capacity of carbon-based SCs.

A Simple Route to Produce Highly Efficient Porous Carbons Recycled from Tea Waste for High-Performance Symmetric Supercapacitor Electrodes

“…The above set of results suggests that TAC3 has various O-containing and N-containing groups on the surface. Importantly, these functional groups can effectively improve the hydrophilicity and wettability of activated carbon, thus making the surface accessible to aqueous electrolytes and capable of excellent electrochemical performances [ 53 , 54 , 55 ].…”

10 years of frontiers in carbon-based materials: carbon, the “newest and oldest” material. The story so far

“…It was claimed that the incorporation of N-doped carbon material avoided the agglomeration of MoS 2 nanocrystals, improved the electron transport capacity, and the stress of MoS 2 during charge/discharge process. Han et al (2021) designed B,Ncodoped coral-like carbon framework and the surface wettability was checked by using the low-field nuclear magnetic resonance relaxation technique. The surface wettability towards the electrolyte, afforded by the presence of surface functional groups, was claimed to be crucial for the supercapacitive performance of the materials developed in that study.…”

“…Carbon frameworks are also important 3D structures, so there is a huge interest in their synthesis. Regarding the synthesis method, Han et al (2021) designed a coral-like carbon framework structure doped with B and N via a simple heat treatment of urea, polyethylene glycol and boric acid. The temperature used for this treatment was 900°C under a N 2 atmosphere, and subsequently, the material was washed with HCl to remove boron trioxide species.…”

“…Meanwhile, Poirot et al (2022) reported the TiO2/CNTs as an interesting electrode for supercapacitors due to the high pseudocapacitance provided by the metal oxide. In the case of doping, Han et al (2021) designed a B,N dual doped coral-like carbon framework (BN-CCF) which offered an excellent performance as an electrode in supercapacitor. This was ascribed to the porous structure, high hydrophilicity and enhanced pseudocapacitance provided by B-containing groups.…”