作者: Xuewei Lu , Zhongfang Li , Xiaoyan Yin , Suwen Wang , Yurong Liu
DOI: 10.1016/J.IJHYDENE.2017.02.090
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摘要: Abstract Three-dimensional nitrogen-doped graphene (3D-NG@SiO2) is prepared by pyrolyzing poly (o-phenylenediamine) (POPD) with high nitrogen content. POPD via an in situ chemical oxidation polymerization of o-phenylenediamine (OPD) acetic acid silica colloid as templates. The optimum parameter OPD:SiO2 = 1:2, pyrolysis @ 900 °C. SEM and TEM images show the wrinkled porous structures. Raman spectra indicate that 3D-NG@SiO2 consists 4–6 layers graphene. N2 adsorption–desorption isotherms reveal pore size distributions mainly centralize at 5–10 nm. XRD illustrates amorphous structure. XPS analysis shows content 3.6% exists form pyridinic pyrrolic nitrogen. oxygen reduction reaction (ORR) performance investigated using a rotating disk electrode initial potential 0.08 V (vs. Hg/HgO). electron transfer number 3.92 −0.3 V Hg/HgO), indicating occurs four-electron process. current density decreases 21% after 60 h chronoamperometry test. CVs manifests loss 0.16 mA cm−2 scanning for 5000 cycles. activity durability promising ORR catalysts.