高等学校化学研究 ›› 2020, Vol. 36 ›› Issue (3): 453-458.doi: 10.1007/s40242-020-0101-7
WANG Yuqing1, TAO Li1, CHEN Ru1, LI Hao1, SU Hui2, ZHANG Nana1, LIU Qinghua2, WANG Shuangyin1
WANG Yuqing1, TAO Li1, CHEN Ru1, LI Hao1, SU Hui2, ZHANG Nana1, LIU Qinghua2, WANG Shuangyin1
摘要: Exploring cost-effective and high-performance oxygen reduction reaction(ORR) electrocatalysts to replace precious platinum-based materials is crucial for developing electrochemical energy conversion devices but remains a great challenge. Herein, Fe single atoms anchored on nanosheet-linked, defect-rich, highly N-doped 3D porous carbon(Fe-SAs/NLPC) electrocatalysts were obtained by pyrolyzing salt-sealed Fe-doped zeolitic imidazolate frameworks(ZIFs). NaCl functions both as pore-forming agent and closed nanoreactor, which can not only lead to the formation of defects-rich three-dimensional interconnected structures with high N-doping content to expose abundant active sites, promote mass transfer and electron transfer, but also facilitate the effective incorporation of Fe to form Fe-Nx active sites without aggregation. These unique characteristics render Fe-SAs/NLPC outstanding electrocatalytic activity for ORR, with one-set potential of 0.96 V and high kinetic current density(jK) of 33.32 mA/cm2 in alkaline medium, which surpass the values of most nonprecious-metal catalysts and even commercial Pt/C.