This study presents the development of nitrogen‐doped carbon sphere/SnS 2 nanocomposites (SnS 2 @NCS) as efficient platinum‐free counter electrodes for dye‐sensitized solar cells (DSSCs). Nitrogen doping introduces topological defects into the carbon matrix, facilitating the epitaxial growth of ultrathin SnS 2 nanosheets into hierarchical architectures. The optimized SnS 2 @NCS electrode exhibits significantly enhanced catalytic activity, demonstrated by a low charge–transfer resistance of 1.070 Ω cm −2 (representing a 74.6% reduction compared to the undoped SnS 2 @CS) and achieves a power conversion efficiency of 8.18%, rivaling that of platinum‐based counterparts. The improved performance is attributed to synergistic effects arising from CN bonds and SnS 2 nanosheets, which collectively enhance interfacial charge transport and electrolyte infiltration. This work demonstrates a cost‐effective strategy for fabricating high‐performance DSSCs.
Li et al. (Sun,) studied this question.