废竹木制备多孔材料及其性能研究

Study on properties of porous materials prepared from waste bamboo

以建筑废材废竹木为前驱体、KOH为活化剂,采用一步热解法制备氮掺杂多孔碳。利用氮气吸附-脱附等温线、XRD、XPS等方法对得到的样品进行表征,结果发现,样品主要由微孔构成,有大的比表面积和高的氮含量,为电化学还原反应提供了丰富的活性位点。电化学测试结果表明,样品还原CO2的主要产物为CO,在-0. 78 V的过电势下,CO的法拉第效率最高达75%,且样品的稳定性良好。

N-doped porous carbon is prepared by one-step pyrolysis method with waste bamboo,a kind of Ncontaining buildings scrap,as precursor and KOH as activator. The obtained samples are characterized by means of N2 adsorption-desorption isotherm,XRD,XPS and so on. It is found that the samples are mainly composed of micropores,showing a large specific surface area and high nitrogen content,which can provide abundant active sites for electrochemical CO2 reduction reaction. The electrochemical test shows that CO is the main product from reduction of CO2 by N-doped porous carbon samples. Faraday efficiency of CO can reach up to 75% at an overpotential of-0. 78 V.Moreover,the sample has a good stability.