▎ 摘　　要

The complicated multielectron and multiphase electrocatalytic sulfur reduction reaction (SRR) occurring in the Li-S battery is demonstrated, which strongly influences the performances of this battery chemistry. Effective candidates for SRR are often based on heteroatom-doped carbon-based electrocatalysts. However, the electrocatalytic sulfur reduction activity of these catalysts is so far insufficiently explored. Herein, a series of graphene doped with nonmetal elements (nitrogen, phosphorus, and sulfur) are designed and synthesized. It is shown that nitrogen-doped graphene has a superior SRR catalytic activity with highest electrochemical reversibility and best electrochemical kinetics for the liquid-solid two-phase conversion from long-chain soluble Li2Sx (4