Lithium alanate (LiAlH₄), as a prototypical high-capacity complex hydride, has attracted intense interest as a promising hydrogen storage material. However, the drawbacks of high dehydrogenation temperatures and slow kinetics in the dehydrogenation process limit its practical applications. Herein, we have successfully synthesized NiCo₂O₄ nanorods anchored on rGO through a low-temperature solution method coupled with annealing treatment, and efficient effects derived from the NiCo₂O₄@rGO composite towards the dehydrogenation of LiAlH₄ are demonstrated. The ball-milled LiAlH₄ + 7 wt% NiCo₂O₄@rGO sample starts to decompose at 62.7 °C and releases a total of 6.28 wt% hydrogen, which is 118 °C lower than that of as-received LiAlH₄, and 42.8 °C lower than that of ball-milled LiAlH₄. The isothermal dehydrogenation kinetics show that the LiAlH₄ + 7 wt% NiCo₂O₄@rGO sample could release approximately 4.0 wt% hydrogen within 20 min at 150 °C, whereas less than 0.04 wt% hydrogen release was detected for LiAlH₄ under identical conditions within 100 min. Kinetic measurements reveal 21.9% and 37.1% reduction in the apparent activation energy of the two-step dehydrogenation of undoped LiAlH₄, respectively, in the presence of a 7 wt% NiCo₂O₄@rGO additive. It is reasonable to conclude that the large surface area and mesoporous structures provided by NiCo₂O₄@rGO nanocomposites play a synergistic role in remarkably improving the dehydrogenation properties of LiAlH₄.

中文翻译：

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NiCo2O4固定的还原型氧化石墨烯纳米复合材料的简便合成，作为改善铝酸锂脱氢性能的有效添加剂

铝酸锂（LiAlH ₄）作为一种典型的高容量复合氢化物，作为一种有前途的储氢材料引起了人们的浓厚兴趣。但是，脱氢温度高和脱氢过程动力学慢的缺点限制了其实际应用。在本文中，我们已经成功地合成了镍钴_2个ö ₄纳米棒通过加上退火处理一低温溶液方法锚定在RGO，并从镍钴衍生的有效效果₂ ö ₄ @rGO复合朝向的LiAlH的脱氢₄被证明。球磨LiAlH ₄ + 7 wt％NiCo ₂ O ₄@rGO样品在62.7°C时开始分解，并释放出总计6.28 wt％的氢，这比接收到的LiAlH ₄降低118°C ，比球磨LiAlH ₄降低42.8°C 。等温脱氢动力学表明，LiAlH ₄ + 7 wt％NiCo ₂ O ₄ @rGO样品在150°C下可在20分钟内释放约4.0 wt％的氢，而在相同条件下LiAlH _4的氢释放低于0.04 wt％。100分钟之内的条件。动力学测量表明，在存在7 wt％的NiCo ₂的情况下，未掺杂LiAlH ₄的两步脱氢反应的表观活化能分别降低了21.9％和37.1％。O ₄ @rGO添加剂。这是合理的结论是，大的表面面积和由镍钴提供的介孔结构_2个ö ₄ @rGO纳米复合材料在显着提高的LiAlH的脱氢性能起协同作用，₄。