Preparation of N,P Co-doped Porous Carbon Derived from Daylily for Supercapacitor Applications

Abstract

Biomass-derived activated carbon is a widely used electrode material for supercapacitors. One of the keys to preparing high-performance activated carbon is the selection of appropriate precursors. Daylily is a common edible herb and is widely planted in Asia. It is rich in nitrogen and phosphorus, so it can be used as a precursor of heteroatom-doped activated carbon. Herein, a daylily-derived porous carbon with a large specific surface area and high content of heteroatoms has been successfully prepared by a simple carbonization method. The as-prepared carbon materials showed a remarkable specific capacitance of 299.1 F/g at 0.5 A/g and excellent cycling stability of 99.6% after 4000 cycles at a current density of 1 A/g. Moreover, the assembled symmetric supercapacitor showed a high energy density of 21.6 Wh/kg at a power density of 598.2 W/kg in 6 M KOH electrolyte. These results demonstrate that the daylily-derived porous carbon is an excellent material for high-performance supercapacitors.

Microwave-plasma induced one-step synthesis of Ni(PO3)2 nanosphere-loaded bio-waste derived N, P co-doped carbon for an asymmetric supercapacitor with prolonged life

“…4a) showed an irregular rectangle shape with two distinguishable faradaic redox couples within the potential window of 0 V to −1.2 V which is due to the incorporation of N and P dopants into the bio-waste derived carbon. 51,52 The redox peaks at −0.6 V (designated as P ox ) and −0.8 V (designated as P red ) can be attributed to the oxidation and reduction of the P doping functionalities (P–O, PO, P–C) attached to the developed carbon, respectively. 53 Similarly, the redox peaks at −0.3 V (designated as N ox ) and −0.4 V (designated as N red ) appeared due to the oxidation and reduction of the N doping functionalities (possibly, N–O, N–C), 53 respectively.…”

Supercapacitive Swing Adsorption of Carbon Dioxide: Current Status and Perspectives

“…Daylily KOH 1531 299 at 0.5 A g À 1 6 M KOH [46] Willow wood KOH 2800 294 at 1 A g À 1 6 M KOH [47] Cherry flower KOH 2025 334 at 0.5 A g À 1 6 M KOH [48] Nelumbo nucifera (Lotus) seed KOH 2330 379 at 1 A g À 1 1 M H 2 SO 4 [49] compared to the specific capacitance of 135 F g À 1 reported by Stoller et al in 2008 for the first graphene-based supercapacitor. [66] Carbon nanotubes (CNT), hollow tubes formed by rolling up single layer graphene (SWNT) or multilayer graphene (MWNT), possess exceptional mechanical, electrical and thermal performances.…”

Unleashing Enhanced Energy Density with PANI/NiO/Graphene Nanocomposite in a Symmetric Supercapacitor Device, Powered by the Hybrid PVA/Na2SO4 Electrolyte

“…The selection of supercapacitive materials is driven by their electrochemical performance. These materials can be broadly categorized into electric double-layer capacitors (EDLC) and pseudocapacitors based on their charge storage mechanisms. , Pseudocapacitor materials, including transition metal oxides (TMOs) and conducting polymers (CPs), exhibit higher specific capacitance and energy density values compared to carbon-based EDLC materials, thanks to their faradaic reactions. − Among CPs, polyaniline (PANI) stands out as a promising electrode material for SCs due to its relatively high conductivity, environmental stability, low cost, and ease of synthesis. , However, the cyclic life of PANI is limited when used solely as an electrode material, as it undergoes structural degradation during continuous doping and dedoping of ions between the electrode and electrolyte . This limitation can be overcome by creating a suitable composite of PANI with other materials that possess superior supercapacitive properties. , …”

“…4−7 Among CPs, polyaniline (PANI) stands out as a promising electrode material for SCs due to its relatively high conductivity, environmental stability, low cost, and ease of synthesis. 8,9 However, the cyclic life of PANI is limited when used solely as an electrode material, as it undergoes structural degradation during continuous doping and dedoping of ions between the electrode and electrolyte. 10 This limitation can be overcome by creating a suitable composite of PANI with other materials that possess superior supercapacitive properties.…”