Doping strategy, not surface area, proves key to better graphene capacitor electrodes

Researchers at Parahyangan Catholic University, Universitas Pertamina, the Korea Institute of Science and Technology (KIST), and Politeknik Negeri Bandung have found that how graphene oxide is doped matters more than how much surface area the resulting material has, when it comes to building better cathodes for lithium-ion capacitors.

The team synthesized a series of doped reduced graphene oxide (rGO) materials using a modified Hummers’ method followed by hydrothermal doping, introducing boron, fluorine, nitrogen and sulfur in both dual-element and quaternary (four-element) combinations. Each variant was characterized structurally (XRD, Raman spectroscopy, BET surface area analysis, XPS, SEM) and tested electrochemically in half-cell configurations using galvanostatic charge-discharge, cyclic voltammetry and impedance spectroscopy.

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