The effect of pyrolysis temperature on the N conversion of biochar derived from the residue of Chlorella vulgaris after lipid extraction

文献类型： 外文期刊

第一作者： Yang, Gaixiu

作者： Yang, Gaixiu;Zheng, Xuhong;Wang, Kexin;Sun, Yongming;Chen, Liumeng;Yang, Gaixiu;Zheng, Xuhong;Sun, Yongming;Dan, Zeng;Xi, Yuebin;Chen, Liumeng

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关键词： Pyrolysis; Nitrogen conversion; Temperature; Biomass based carbon materials; Oxygen reduction reaction

期刊名称：JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS （ 影响因子：6.0； 五年影响因子：5.8 ）

ISSN： 0165-2370

年卷期： 2023 年 169 卷

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收录情况： SCI

摘要： The application of biomass-based carbon materials in catalyzing oxygen reduction reactions has gained a renewed momentum due to their abundant heteroatoms and inherent structures. In this study, the effect of pyrolysis temperature on the nitrogen conversion of nitrogen-enriched biomass waste-microalgae residue carbon catalysts, and their application in microbial fuel cells, were studied. Temperature exhibits a significant impact on the effective nitrogen functional groups, playing a vital role in the oxygen reduction reaction process. Results revealed that an interconversion may occur among the nitrogen functionalities, where Pyrrolic-N, which is the dominant N formed at 700 degrees C, was converted to Pyridinic-N as the temperature increased to 800 degrees C. Graphitic-N has the best thermal stability; thus, it occupies the highest ratio at 900 degrees C. In addition, the increment in temperature resulted in the loss of nitrogen. The biochar prepared at 800. exhibited the most outstanding oxygen reduction reaction activity (0.8444 V vs. RHE), due to its relatively high nitrogen content (5.75 at%), more active nitrogen forms (Pyridinic-N and Graphitic-N) and appropriate pore structure. The maximum power density of a microbial fuel cell assembled with MRC-800 as cathode catalyst was 442.5 mW m(-2). This research not only presents a fundamental study on the nitrogen conversion of biochar, but also provides a promising metal-free electrode catalyst for microbial fuel cells.

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