Nitrogen-Doped Hierarchical Meso/Microporous Carbon from Bamboo Fungus for Symmetric Supercapacitor Applications

Abstract

We report the synthesis of nitrogen-doped hierarchical meso/microporous carbon using renewable biomass bamboo fungus as precursor via two-step pyrolysis processes. It is found that the developed porous carbon (NHPC-800) features honeycomb-like cellular framework with well-developed porosity, huge specific surface area (1708 m2 g−1), appropriate nitrogen-doping level (3.2 at.%) and high mesopore percentage (25.5%), which are responsible for its remarkable supercapacitive performances. Electrochemical tests suggest that the NHPC-800 electrode offers the largest specific capacitance of 228 F g−1, asplendid rate capability and stable electrochemical behaviors in a traditional three-electrode system. Additionally, asymmetric supercapacitor device is built based on this product as well. An individual as-assembled supercapacitor of NHPC-800//NHPC-800 delivers the maximum energy density of 4.3 Wh kg−1; retains the majority of capacitanceat large current densities; and shows terrific cycling durability with negligible capacitance drop after long-term charge/discharge for beyond 10,000 cycles even at a high current density of 10 A g−1. These excellent supercapacitive properties of NHPC-800 in both three- and two-electrode setups outperform those of lots of biomass-derived porous carbons and thus make it a perspective candidate for producing cost-effective and high-performance supercapacitors

Renewable biomass‐derived carbons for electrochemical capacitor applications

“…The positive charges pyridinic‐N‐oxide and graphitic‐N are beneficial for accelerating the electron transfer, while the negative charges of pyridinic‐N and pyrrolic‐N provide electroactive sites for pseudocapacitance to the specific capacity. Numerous biomass materials contain nitrogen element, including pine needle, 164 juncus, 46 chitosan, 170 coronarium, 148 pine pollen, 171 bamboo fungus, 172 spirulina platensis, 173 and porcine bladders 174 . These materials can be transformed into nitrogen self‐doped BDCs by carbonization and activation without additional nitrogen dopants.…”

Preparation of phosphorus-doped porous carbon for high performance supercapacitors by one-step carbonization

“…11 Among them, porous carbon derived from renewable biomass is widely used due to its relatively low cost, environmentally friendly characteristics, and simple synthetic process. Many studies have produced porous carbon from biomass, such as wood, 12 bamboo, 13 nutshells, 14 seeds, 15 peels, 16 leaves, 17 and seaweed, 18 which have excellent electrochemical properties and can be used as electrode materials. In this case, we use r sawdust, a low-cost and renewable forestry residue, to produce porous carbon.…”

Nanoarchitectonics of Nanoporous Carbon Materials in Supercapacitors Applications

“…Xiao and coworkers have used high-temperature alkaline activation method and obtained nitrogen-doped (3.2%) carbon with hierarchical meso/microporous architecture from bamboo fungus [149]. The porous carbon featured honeycomb-like cellular framework with the rational distribution of mesopores and micropores and exhibits a high specific surface area (1708 m 2 g −1 ).…”

“…The porous carbon featured honeycomb-like cellular framework with the rational distribution of mesopores and micropores and exhibits a high specific surface area (1708 m 2 g −1 ). In the symmetric supercapacitor cell, the prepared material exhibits an energy density of 4.3 Wh kg −1 with negligible degradation of the capacitance for 10 000 charge−discharge cycles at 10 A g −1 [149].…”