Dual-heteroatom-modified ordered mesoporous carbon: Hydrothermal functionalization, structure, and its electrochemical performance

Abstract

The diverse applications of ordered mesoporous carbons (OMCs) are not only bonded to their superior structural properties, but also to their chemical properties. The termination of graphene sheets in OMCs provides abundant sites for heteroatom decoration to mediate their chemical properties. In this contribution, boron and phosphorus were co-incorporated into OMCs via a facile aqueous selfassembly taking advantage of a hydrothermal doping strategy. The as-obtained B/P-modified OMCs process a large surface area of ca. 600 m 2 g À1, and a uniform pore size of ca. 6.3 nm, as well as long range ordering. By varying the hydrothermal synthesis temperature, the concentration of B and P introduced can be controlled from 0.8 to 1.6 wt% and from 2.3 to 3.6 wt%, respectively. The interaction of heteroatom B and P was enhanced when the hydrothermal temperature is above 100 C. The heteroatom-containing groups were firmly embedded and homogeneously distributed on the carbon frameworks. When the B/P co-modified OMCs were applied as electrodes in supercapacitors, they presented promising performance compared with B-or/and P-modified OMC obtained without hydrothermal treatment.

Porous Carbon Nanosheets Prepared from Plastic Wastes for Supercapacitors

“…5d) can be deconvoluted into two peaks at 531.0 eV and 532.8 eV that correspond to quinine and C=O. 35,38 Based on the aforementioned characteristics, including sheet-like morphology, nitrogen doped nature, high specific surface area and porous structure, the N-PCNs are potentials for supercapacitor applications. The electrochemical properties are investigated in a 6 M KOH aqueous solution by CV, GCD and Nyquist plots within the potential window of À 1 V to 0 V in a three-electrode system.…”

Nitrogen- and phosphorus-co-doped carbons with tunable enhanced surface areas promoted by the doping additives

“…The black product was also characterised by means of elemental combustion analysis (EA) and inductively coupled plasma optical emission spectrometry (ICP-OES) to determine the degree of heteroatom-doping: 4.1 wt% of N-doping (EA) and 5.7 wt% of P-doping (ICP-OES) are revealed. The material is thus successfully dually doped; especially the remarkably high degree of P-doping compared to other approaches [36][37][38] is noteworthy and points out the advantages of the method. To also prove the homogeneity of the material, elemental mapping based on energy dispersive X-ray spectroscopy (EDX) and wavelength dispersive X-ray spectroscopy (WDX) was performed.…”

“…in electrochemistry, are known. Although other heteroatoms are of thriving interest, synthetic pathways towards boron-, [23][24][25][26] sulphur- [27][28][29][30][31][32][33][34][35] and phosphorus-doped [36][37][38] carbons are still rare. As especially bigger atoms like S or P have most preferable effects on the polarisability of the carbon materials and thus on their performance in electrochemical applications, [31][32][33][34][35][36] new synthesis routes are inevitable.…”

Hydrothermal functionalization of ordered mesoporous carbons: The effect of boron on supercapacitor performance

“…In contrast, OMCs can be directly obtained by soft-templating approaches avoiding the use of corrosive reactants. Several works preparing boron containing OMCs using block copolymers as templates and polymerizable carbon/boron precursors in solution can be found in the literature [26][27][28][29][30]. Nevertheless, some of them involve the use of silica in solution (tri-constituent co-assembly method) [26,27] or the evaporation of large amounts of organic solvents (EISA method) [11,28].…”