Environmental problems caused by excessive carbon dioxide emissions demand more than attention but realistic plans and specific actions as well. The development of materials with an efficient CO 2 adsorption performance is significant. In this paper, boric acid and ethylenediamine are used as boron and nitrogen sources, respectively, without using a hard/soft template, and a simple hydrothermal carbonization method is used to synthesize hierarchical porous carbon materials double-doped with boron and nitrogen. The cooperative effect between the doped elements and the well-developed porous structure leads to the excellent CO 2 capture ability of the prepared adsorbent. Notably, the material also exhibits impressive cyclic stability, revealing the feasibility of its use in practical applications.
The CN-15-x series materials with different doses of SBA-15 template and the CN-y-2.0 series materials with different hard templates were prepared by the hard template method with hexamethylenetetramine as the carbon and nitrogen source. The obtained mesoporous carbon materials were characterized by X-ray diffraction (XRD), N 2 adsorption-desorption, transmission electron microscopy (TEM), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). The catalytic performance of propane oxidative dehydrogenation was determined. The characterization results indicate that the catalytic activity of CN-15-2.0 with a bipartite hexagonal ordered structure was higher than those of the other materials. The conversion of propane was 22.98%, and the selectivity toward propylene was 41.70%.
Hydrolysis for hydrogen production is one of the most efficient ways to produce hydrogen energy. In order to realize its wide application, people urgently need to find cheap and efficient metal-free electrocatalysts to replace the noble-metal electrocatalysts in hydrogen evolution reaction (HER). Here, N-doped hierarchical porous carbon materials were successfully fabricated without any template. We changed the nitrogen and carbon source needed to prepare the material and tested HER performance. In all samples, the ethylenediamine-based porous carbon material (NPC-2) compared with other nonmetallic heteroatom doped carbon materials and some traditional metallic catalysts exhibited outstanding HER performance and stability in acid solution. To achieve a 10 mA/cm2 HER current density, the nitrogen-doped hierarchical porous carbon materials (NPC-2) required an overpotential of 398 mV.
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