As a hydrogen storage material, palladium nanoparticle decorated nitrogen doped graphene (Pd/N-rGO) has drawn much attention owing to its high absorption capacity at moderate conditions. However, its hydrogen absorption-desorption cycle performance, which is essential for their practical application, has been rarely studied. In this paper, a simple and convenient high temperature thermal reduction method was used to synthesize nitrogen-doped graphene decorated with Pd nanoparticles (Pd/N-rGO). Taken it as a representative, the hydrogen absorption-desorption cycle performance of Pd/N-rGO was investigated. The results showed that after three cycles the hydrogen storage capacity dropped from 2.9 ​wt% to 0.8 ​wt% at 25 ​°C and 4 ​MPa pressure. It was found that the palladium nanoparticles shed from Pd/N-RGO sheet after cycle performance test, and then agglomerated. These phenomena will weaken the hydrogen spillover effect, leading to the decrease of hydrogen storage capacity. Meanwhile, decreased defects reduce the hydrogen absorption sites, which will thus deteriorate the hydrogen storage capacity.

作为储氢材料，钯纳米粒子修饰的氮掺杂石墨烯（Pd/N-rGO）因其在中等条件下的高吸收能力而备受关注。然而，对其实际应用至关重要的吸氢-解吸循环性能却鲜有研究。本文采用一种简单方便的高温热还原方法合成了以Pd纳米粒子装饰的氮掺杂石墨烯（Pd/N-rGO）。以它为代表，研究了Pd/N-rGO的吸氢-解吸循环性能。结果表明，在25℃和4MPa压力下，三个循环后储氢容量从2.9wt%下降到0.8wt%。发现钯纳米颗粒在循环性能测试后从 Pd/N-RGO 片上脱落，然后凝聚。这些现象会削弱氢溢出效应，导致储氢能力下降。同时，缺陷的减少减少了吸氢位点，从而降低了储氢能力。