Capacitance enhancement by electrochemically active benzene derivatives for graphene-based supercapacitors
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AbstractVarious aromatic molecules have been reported to improve the performance of reduced graphene oxide (rGO)-based supercapacitors. However, the mechanism for this improvement remains unclear. Here we design a facile approach that clearly identifies the main reason for the enhancement. Benzene derivatives, namely p-phenylenediamine (PPD), m-phenylenediamine (MPD), o-phenylenediamine (OPD), hydroquinone (HQ), phenol, aniline and p-aminophenol (PAP) are incorporated into graphene oxide (GO) layers during their reduction and assembly at room temperature. We find that the capacitance increase mainly arises from the pseudocapacitance of specific benzene derivative molecules rather than their spacing effect. Moreover, the para and ortho substituted benzene derivatives contribute much more than the meta substituted ones do. With a small amount of PPD (similar to 11 wt%), the specific capacitance reaches 273 F g(-1), much higher than that of pure rGO electrodes (113 F g(-1)). The hybrid electrode also shows great stability with a capacitance retention of up to 86% after 10 000 charge/discharge cycles.
All Author(s) ListWu ZK, Lin ZY, Li LY, Song B, Tuan CC, Li Z, Moon KS, Bai SL, Wong CP
Journal nameRSC Advances
Volume Number5
Issue Number102
Pages84113 - 84118
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesChemistry; Chemistry, Multidisciplinary

Last updated on 2020-20-11 at 02:43