Du Juan, Peng Xingyu, Gao Xueqing, Li Jinfeng, Han Qinghui, Guan Jing, Chen Aibing
College of Chemical and Pharmaceutical Engineering, Hebei University of Science and Technology, 26 Yuxiang Street, Shijiazhuang 050018, P. R. China.
School of Environmental & Municipal Engineering, Qingdao University of Technology, Qingdao 266033, P. R. China.
Nano Lett. 2024 Oct 2;24(39):12140-12147. doi: 10.1021/acs.nanolett.4c02780. Epub 2024 Aug 9.
N-Doped carbon sheets based on edge engineering provide more opportunities for improving oxygen reduction reaction (ORR) active sites. However, with regard to the correlation between porous structural configurations and performances, it remains underexplored. Herein, a silica-assisted localized etching method was employed to create two-dimensional mesoporous carbon materials with customizable pore structures, abundant edge sites, and nitrogen functionalities. The mesoporous carbon exhibited superior electrocatalytic performance for the ORR compared to that of a 20 wt % Pt/C catalyst, achieving a half-wave potential of 0.88 V versus RHE, situating them in the leading level of the reported carbon electrocatalysts. Experimental data suggest that the edge graphitic nitrogen sites played a crucial role in the ORR process. The three-dimensional interconnected pores provided a high density of active sites for the ORR and facilitated the efficient transport of electrons. These unique properties make the carbon sheets a promising candidate for highly efficient air cathodes in rechargeable Zn-air batteries.
基于边缘工程的氮掺杂碳片为改善氧还原反应（ORR）活性位点提供了更多机会。然而，关于多孔结构构型与性能之间的相关性，仍未得到充分探索。在此，采用二氧化硅辅助的局部蚀刻方法来制备具有可定制孔结构、丰富边缘位点和氮官能团的二维介孔碳材料。与20 wt%的Pt/C催化剂相比，该介孔碳对ORR表现出优异的电催化性能，相对于可逆氢电极（RHE）的半波电位达到0.88 V，使其处于已报道的碳基电催化剂的领先水平。实验数据表明，边缘石墨氮位点在ORR过程中起关键作用。三维相互连接的孔为ORR提供了高密度的活性位点，并促进了电子的高效传输。这些独特性能使碳片成为可充电锌空气电池中高效空气阴极的有前途的候选材料。
