Graphene, as one of the carbon-based materials, is considered to be a potential replacement for platinum and has been widely used as a counter electrode in dye-sensitized solar cells to achieve low-cost and high electrocatalytic materials. In this work, we synthesized a nitrogen-sulfur-coordinated iron complex as a source of heteroatoms, and prepared iron-nitrogen-sulfur co-doped reduced graphene oxide (FeNS-rGO) composite material by mixing with different mass ratios of graphene oxide (GO) and thermal annealing under nitrogen at 400 °C. The sintered GO was transformed into rGO, which increased the conductivity of materials, while the doping of nitrogen and sulfur atoms enhanced the carrier mobility and conductivity of the material. The distribution of Fe on graphene also improved the catalytic performance of material. FeNS-rGO (5:1), used as the CE in DSSC, showed superior reduction catalytic activity for I⁻/I₃⁻ compared to platinum and demonstrated an excellent power conversion efficiency of 8.17 %, which outperformed platinum. This proves that the graphene composite material doped with iron, nitrogen, and sulfur has excellent performance and can be used as a substitute for platinum.

石墨烯作为碳基材料之一，被认为是铂的潜在替代品，已广泛用作染料敏化太阳能电池中的对电极，以实现低成本和高电催化材料。在这项工作中，我们合成了氮硫配位铁配合物作为杂原子源，并通过与不同质量比的氧化石墨烯混合制备了铁氮硫共掺杂还原氧化石墨烯（FeNS-rGO）复合材料（ GO) 和 400 °C 氮气下热退火。烧结后的GO转变为rGO，增加了材料的电导率，而氮和硫原子的掺杂则增强了材料的载流子迁移率和电导率。Fe在石墨烯上的分布也提高了材料的催化性能。FeNS-rGO (5:1) 用作 DSSC 中的 CE，与铂相比，对 I ^- /I ₃ ^-表现出优异的还原催化活性，并表现出 8.17% 的优异功率转换效率，优于铂。这证明掺杂铁、氮、硫的石墨烯复合材料具有优异的性能，可以作为铂的替代品。