Honeycomb-like graphitic ordered macroporous carbon prepared by pyrolysis of ammonium bicarbonate

Honeycomb-like graphitic macroporous carbon (HGMC) was synthesized by means of pyrolysis of NH4HCO3 using Mg powder as reductant in an autoclave at 550 °C. The characterization of structure and morphology was carried out by X-ray diffraction (XRD), Raman spectrum, field-emission scanning electron microscopy (FESEM), and (High-resolution) transmission electron microscope [(HR)TEM]. The results of nitrogen adsorption–desorption indicate that the products are macropore materials with the pore size of 1–3 μm, and the Brunauer–Emett–Teller (BET) surface area was 14 m2/g. As a typical morphology, the possible growth process of HGMC was also investigated and discussed. The experimental results show that the in situ formed MgO microparticles play a template role during the HGMC formation.

Honeycomb-like graphitic macroporous carbon (HGMC) with big pores centered at 1–3 μm, has been prepared by controlling the reaction temperature and amount of NH4HCO3 at 550 °C in a sealed reaction system. Possible formation processes of HGMC are discussed on the experimental results. It is believed that the in situ formed MgO microparticles play a template role during the preparation of HGMC.Figure optionsDownload as PowerPoint slideHighlights
► Honeycomb-like graphitic carbon was synthesized at 550 °C.
► The honeycomb-like graphitic carbon is macroposous structures.
► The formed MgO microparticles play a template role during the HGMC formation.
► The method can be expended to synthesize other porous or hollow carbon material.