A melamine-based carbon foam was obtained from a melamine foam (2×2×2 cm³), which was then coated with graphene by immersing it in 400 mL of a suspension of reduced graphene oxide in water with concentrations of 25 to 100 mg/L. MoS₂/graphene/carbonized melamine foam composites for use as catalysts for the hydrogen evolution reaction were synthesized by the hydrothermal growth of MoS₂ nanosheets on the graphene-coated carbon foams in a mixed solution of molybdic acid disodium salt and thiourea. Results indicate that MoS₂ nanosheets with a thickness of 15–20 nm were uniformly distributed on the three-dimensional carbon foam substrates coated with different amounts of graphene. The amount of graphene coating has a great influence on the hydrogen evolution performance. The composite prepared with a graphene concentration of 25 mg/L has the best electrochemical performance, its initial overpotential at a 10 mA cm^–2 current density is 163 mV, and the corresponding Tafel slope is 76 mV dec^–1. It has also the lowest impedance, which shows that coating the carbon foam with an appropriate amount of reduced graphene oxide accelerates electron migration and improves the hydrogen evolution performance.

从三聚氰胺泡沫（2×2×2 cm ³）中获得三聚氰胺基碳泡沫，然后将其浸入400 mL浓度为25至100 mg的还原性氧化石墨烯的悬浮液中，用石墨烯涂覆/升 MoS ₂ /石墨烯/碳化三聚氰胺泡沫复合材料用作氢气析出反应的催化剂，是通过在钼酸二钠盐和硫脲的混合溶液中在涂有石墨烯的碳泡沫上水热生长MoS ₂纳米片而合成的。结果表明，MoS ₂厚度为15–20 nm的纳米片均匀地分布在涂覆有不同石墨烯量的三维碳泡沫基材上。石墨烯涂层的量对析氢性能有很大的影响。石墨烯浓度为25 mg / L的复合材料具有最佳的电化学性能，在10 mA cm ^–2的电流密度下其初始超电势为163 mV，相应的Tafel斜率为dec ^–1的76 mV 。它还具有最低的阻抗，这表明用适量的还原氧化石墨烯覆盖碳泡沫可加速电子迁移并改善氢释放性能。