A novel hierarchical porous nitrogen-doped carbon derived from bamboo shoot for high performance supercapacitor

Abstract

Porous N-doped carbons hold good prospects for application in supercapacitor due to their low-cost, large surface area, good surface wettability, high electrical conductivity as well as extra pseudocapacitance. However, most synthetic methods required the tedious and multiple-step process with the assistance of hard/soft templates or the massive use of chemical reagents, and exogenous nitrogen sources, which made them difficult to realize industrial production and application. Here, we described a novel hierarchical porous N-doped carbons fabricated by a facile and sustainable approach via hydrothermal treatment and subsequent carbonization process by using renewable bamboo shoots as the starting material without any templates, additional chemical activation and nitrogen source. The obtained bamboo shoot-derived carbons possessed a large BET surface area (up to 972 m2 g−1), hierarchically interconnected porous framework, rich and uniform nitrogen incorporation (3.0 at%). Benefiting from these unique features, the novel carbon-based electrode materials displayed a high capacitance of 412 F g−1 in KOH electrolyte and long cycling life stability. Thus, an advanced electrode material for high-performance supercapacitor was successfully assembled by a simple and scalable synthesis route with abundant renewable resources freely available in nature.

Preparation of nitrogen-doped porous carbons for high-performance supercapacitor using biomass of waste lotus stems

“…35,36 In general, the N-6 and N-5 in the carbons were regarded as electroactive sites, which would benet the enhancement of electrical conductivity as well as capacitances. 37 These results illustrate increasing total contents of N-6 and N-5, similar to previous results indicating that high N-6 and N-5 contents in porous carbons signicantly contribute to conductivity. 38 Fig.…”

High yield conversion of biowaste coffee grounds into hierarchical porous carbon for superior capacitive energy storage

“…This result further verified the significant role of FeCl 3 that mainly introduced meso-/macropores into carbon matrix during carbonization, as consistent with the TEM result. Alkali activation is widely used to produce micropores-dominant carbon with large specific surface area (SSA) and abundant micropores, as confirmed by previous reports 42,43 . In our work, HPCs displayed a typical I/IV pattern with a H4 hysteresis loop after KOH activation process, indicating the presence of abundant micropores and meso-/macropores.…”

Preparation and electrochemical performance of nitrogen-enriched activated carbon derived from silkworm pupae waste

“…7a shows the CV curves of all samples at a scan rates of 5 mV s À1 in the potential range of À0.2-0.8 V. The CV curves of the YP50 exhibited quasirectangular shape, indicating the electrical double layer capacitor behavior, 31 while those of the P-ACs displayed a slight distortion and hump located at approximately 0 V generated from redox reactions of the nitrogen functionalities. 32,33 The area of the CV curves for the P-ACs are larger than that of the YP50 implying a high capacitance even though the P-ACs possess smaller surface area. Fig.…”