Graphite nanoplatelets (GNPs) have been used as a secondary filler to improve the electrical conductivity of poly(phenylene sulfide) (PPS)/graphite composites for use as bipolar plates in fuel cells, and the effects of adding small quantities of GNPs on the electrical, thermal, and mechanical properties of PPS/GNP/graphite composites have been extensively studied. The GNPs were compounded with PPS to produce master batch (MB) chips that were further ground to fine MB powder (MB_g). PPS/MB_g/graphite powders were compressed to fabricate 10-mm thick square samples. Composites containing a large quantity of graphite (~80 wt%) were then tested for use as a bipolar plate in phosphoric acid fuel cells. When 5 wt% GNP was added to the PPS/graphite composite, the in-plane electrical conductivity increased almost twofold from 643 to 1340 S·cm⁻¹, the through-plane electrical conductivity increased from 19 to 54 S·cm⁻¹, the through-plane thermal conductivity increased approximately two-fold from 60 to 129 W·(mK)⁻¹, and the flexural strength decreased slightly from 32 to 26 MPa. The fractured surface of the compressed MB_g sample revealed well-dispersed GNPs in the PPS matrix, which created electrical pathways and improved the electrical conductivity of the non-conducting PPS matrix material. Thus, the PPS/GNP/graphite composite is a promising system for bipolar plate applications because a higher amount of graphite (~93 wt%) is needed in PPS/graphite composites to reach the same level of electrical conductivity as the PPS/MB_g(5 wt%)/graphite (75 wt%) composite, and such a large quantity of graphite is difficult to process and leads to weaker mechanical properties.

石墨纳米片（GNP）已被用作辅助填料，以改善用作燃料电池中双极板的聚苯硫醚（PPS）/石墨复合材料的电导率，以及在电气上添加少量GNP的影响对PPS / GNP /石墨复合材料的热，机械性能进行了广泛的研究。将GNP与PPS混合以生产母料（MB）碎片，然后将其进一步研磨成MB细粉（MB _g）。PPS / MB_克将石墨粉压缩以制造10毫米厚的正方形样品。然后测试了包含大量石墨（〜80 wt％）的复合材料，用作磷酸燃料电池中的双极板。当向PPS /石墨复合物中添加5 wt％GNP时，面内电导率从643增加到两倍，达到1340 S·cm ^-1，通面电导率从19增加到54 S·cm ^-1，贯穿面的热导率从60到129 W·（mK）^-1增加了大约两倍，抗弯强度从32 MPa略有降低。压缩后的MB _g的断裂面样品显示PPS基质中的GNP分散良好，这创造了电通路并提高了非导电PPS基质材料的电导率。因此，PPS / GNP /石墨复合材料是用于双极板应用的有前途的系统，因为在PPS /石墨复合材料中需要更高数量的石墨（〜93 wt％）才能达到与PPS / MB _g相同的电导率水平。（5重量％）/石墨（75重量％）复合材料，并且如此大量的石墨难以加工并且导致较弱的机械性能。