Nitrogen/phosphorus dual-doped hierarchically porous graphitic biocarbon with greatly improved performance on oxygen reduction reaction in alkaline media

作者：Tong, Jinhui^*; Ma, Wenmei; Wang, Wenhui; Ma, Jiangping; Li, Wenyan; Bo, Lili; Fan, Haiyan^*

来源：Journal of Electroanalytical Chemistry, 2018, 809: 163-170.

DOI：10.1016/j.jelechem.2017.12.055

• N, P-doped biocarbons
• Metal free catalysts
• Alkaline fuel cell
• Oxygen reduction reaction

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 N-2 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 PVC (20%) with respect to onset potential, halfwave potential and limit current density.

• 出版日期2018-1-15
• 单位甘肃农业大学; 西北师范大学