| Autor: |
Yang JL; School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore., Yang P; The Institute of Technological Sciences, MOE Key Laboratory of Hydrodynamic Transients, Wuhan University, Wuhan 430072, China., Cai DQ; School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore., Wang Z; College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, China., Fan HJ; School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore. |
| Abstrakt: |
Single-atom catalysts (SACs) with high atom utilization and outstanding catalytic selectivity are useful for improving battery performance. Herein, atomically dispersed Ni-N 4 and Fe-N 4 dual sites coanchored on porous hollow carbon nanocages (Ni-Fe-NC) are fabricated and deployed as the sulfur host for Li-S battery. The hollow and conductive carbon matrix promotes electron transfer and also accommodates volume fluctuation during cycling. Notably, the high d band center of Fe in Fe-N 4 site demonstrates strong polysulfide affinity, leading to an accelerated sulfur reduction reaction. Meanwhile, Li 2 S on the Ni-N 4 site delivers a metallic property with high S 2p electron density of states around the Femi energy level, enabling a low sulfur evolution reaction barrier. The dual catalytic effect on Ni-Fe-NC endows sulfur cathode high energy density, prolonged lifespan, and low polarization. |
