Abstract
The N, P dual-doped hierarchically porous graphitic biocarbons were prepared via a simple pyrolysis of the precursors derived from hydrothermal treatment of natural polymer chitosan and triphenyl phosphine (P(Ph)3). The characterization using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and N2 adsorption-desorption analysis indicated the samples doping with P exhibited smaller crystal size and more defect sites. The electrocatalytic activities of the as-prepared samples were evaluated with oxygen reduction reaction (ORR) in alkaline media. The results showed that the catalytic properties of N, P dual-doped samples were greatly enhanced compared with the phosphorous free ones. The optimized catalysts exhibited nearly equivalent catalytic performances to the commercial Pt/C (20%) with respect to onset potential, halfwave potential and limit current density.
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