Graphene oxide sheets tend to self-stack, and this self-stacking can be reopened by water molecules and the interlayer space can be accessible. However, in the reduction of GO, due to the removal of the hydrophilic oxygen functionalities, the self-stacked rGO sheets can hardly be separated again and thus it is difficult to recover the interlayer space. Moreover, the increased in-plane strain caused by the removal of functionalities may lead to the self-folding of rGO sheets. These unfavorable morphology changes will largely reduce the effective specific surface area of the materials and thus limit their performance. Introducing surfactants or physical spacers is commonly performed to resist the self-stacking and aggregation of rGO materials during their synthesis. However, these widely used approaches will inevitably associate with undesirable impurities which are usually difficult to be removed. Accordingly, we suggest that it will be more optimized if GO can be reduced without undesirable chemical impurities or physical spacers while keeping its sheet morphology.