Li−S batteries are recognized as one of the most promising energy storage and conversion devices because of the high theoretical energy density and acceptable financial and environmental costs but suffer from sluggish sulfur reduction. Herein, the g-C 3 N 4 /g-C 3 N 4 heterojunction is synthesized using two kinds of precursors, aiming to adjust the electron cloud structure of g-C 3 N 4 and the interface adhesion energy. This intimate interface of g-C 3 N 4 /g-C 3 N 4 endows a significantly accelerated reaction kinetics and enhanced transportation of ions and electrons. Furthermore, the abundant N element of g-C 3 N 4 allows physical confinement and chemical interactions with lithium polysulfides (LiPSs). As a result, a Li−S cell with a g-C 3 N 4 /g-C 3 N 4 heterojunction as the sulfur host provides an initial discharge capacity of 1200 mAh/g at 0.1 C and retains 464 mAh/g after 150 cycles at 1 C. It also exhibits a stable rate capability of 350 mAh/g after 500 cycles at 2 C. This study may provide insights into functionalizing g-C 3 N 4 for application in Li−S batteries.
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