Kochaniec Maria K, Lieder Marek
Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664, Warsaw, Poland.
Chemical Faculty, Department of Process Engineering and Chemical Technology, Gdansk University of Technology, Narutowicza 11/12, 80-233, Gdansk, Poland.
Sci Rep. 2024 Oct 8;14(1):23374. doi: 10.1038/s41598-024-72411-1.
The one-step carbonization of low cost and abundant chitosan biopolymer in the presence of salt eutectics ZnCl/NaCl results in nitrogen-doped carbon nanostructures (8.5 wt.% total nitrogen content). NaCl yields the spacious 3D structure, which allows external oxygen to easily reach the active sites for the oxygen reduction reaction (ORR) distinguished by their high onset potential and the maximum turnover frequency of 0.132 e site⁻ s⁻. Data show that the presence of NaCl during the synthesis exhibits the formation of pores having large specific volumes and surface (specific surface area of 1217 m g), and holds advantage by their pores characteristics such as their micro-size part, which provides a platform for mass transport distribution in three-dimensional N-doped catalysts for ORR. It holds benefit over sample pre-treated with LiCl in terms of the micropores specific volume and area, seen as their percentage rate, measured in the BET. Therefore, the average concentration of the active site on the surface is larger.
在盐共晶ZnCl/NaCl存在的情况下，低成本且储量丰富的壳聚糖生物聚合物一步碳化可生成氮掺杂碳纳米结构（总氮含量为8.5 wt.%）。NaCl产生宽敞的三维结构，使外部氧气能够轻松到达氧还原反应（ORR）的活性位点，这些活性位点的起始电位高，最大周转频率为0.132 e site⁻ s⁻。数据表明，合成过程中NaCl的存在表现出形成具有大比容和表面积的孔（比表面积为1217 m² g），并因其孔特征（如微孔部分）具有优势，这为三维氮掺杂ORR催化剂中的质量传输分布提供了平台。就微孔比容和面积而言，以BET测量的百分比速率来看，它比用LiCl预处理的样品更具优势。因此，表面活性位点的平均浓度更大。
