Ding Yiwang, Yu Chang, Chang Jiangwei, Yao Chun, Yu Jinhe, Guo Wei, Qiu Jieshan
State Key Lab of Fine Chemicals, School of Chemical Engineering, Liaoning Key Lab for Energy Materials and Chemical Engineering, Dalian University of Technology, Dalian, 116024, Liaoning, China.
College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.
Small. 2020 Mar;16(10):e1907164. doi: 10.1002/smll.201907164. Epub 2020 Feb 16.
The methodology of metal-involved preparation for carbon materials is favored by researchers and has attracted tremendous attention. Decoupling this process and the underlying mechanism in detail are highly required. Herein, the intrinsic mechanism of carbon fixation in graphitic carbon nitride (g-C N ) via the magnesium-involved carbonization process is reported and clarified. Magnesium can induce the displacement reaction with the small carbon nitride molecule generated by the pyrolysis of g-C N , thus efficiently fixing the carbon onto the in situ template of Mg N product to avoid the direct volatilization. As a result, the N-doped carbon nanosheet frameworks with interconnected porous structure and suitable N content are constructed by reconstruction of carbon and nitrogen species, which exhibit a comparable photoelectric conversion efficiency (8.59%) and electrocatalytic performances to that of Pt (8.40%) for dye-sensitized solar cells.
金属参与的碳材料制备方法受到研究人员的青睐，并引起了极大的关注。详细解开这一过程及其潜在机制的需求极为迫切。在此，报道并阐明了通过镁参与的碳化过程在石墨相氮化碳（g-C₃N₄）中固定碳的内在机制。镁能与g-C₃N₄热解产生的小氮化碳分子发生置换反应，从而有效地将碳固定在Mg₃N₂产物的原位模板上，避免碳直接挥发。结果，通过碳和氮物种的重构构建了具有相互连接的多孔结构和合适氮含量的氮掺杂碳纳米片框架，其在染料敏化太阳能电池中表现出与Pt（8.40%）相当的光电转换效率（8.59%）和电催化性能。
