| 초록 |
Single-atom M-N-C catalysts have been enormously researched in electrocatalyst application. MNx active sties can be easily tuned to increase intrinsic catalytic activity. Designing active sites is mainly focused on the way of doping heteroatom and generating defects, however, we concentrated on how graphene support morphology can affect the active sites.We introduced H2O2 treatment to graphene support, and it can not only distort the morphology of graphene support but also generate vacancy defects. Highly wrinkled graphene support morphology makes nonplanar distortion of FeN4 active sites. Distorted morphology modified the electronic structure of the metal to improve the Li2S redox step, and increased specific surface area also improved performance at low C-rates. The combination of modified FeN4 active sites and wrinkled graphene morphology shows the remarkable performance of lithium-sulfur battery with high cycling stability. |
