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首页> 外文期刊>Energy Conversion & Management >Electrochemical behavior of exfoliated NiCl_2-graphite intercalation compound affected by hydrogen sorption
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Electrochemical behavior of exfoliated NiCl_2-graphite intercalation compound affected by hydrogen sorption

机译：剥落的NiCl_2-石墨插层化合物的电化学行为受氢吸附的影响

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摘要

The aim of this investigation was to examine the processes occurring in alkaline solution for electrodes made of graphite intercalation compound with nickel chloride (NiCl_2-GIC) and exfoliated graphite intercalation compound with nickel chloride (NiCl_2-EGIC). On the contrary to most acceptor graphite intercalation compounds (GICs), which are easily exfoliated upon heat treatment, NiCl_2-GIC appeared to be thermally resistant even if the process was carried out at very high temperatures. Exfoliation of NiCl_2-GlC was succeeded at room temperature by chemical method in the solution of hydrogen peroxide. The effects of exfoliation were examined by XRD and SEM techniques. As shown by these techniques, after exfoliation a part of NiCl_2 intercalate persisted in the graphite lattice. Using the cyclic voltammetry method it was shown that the process of electrochemical reduction occurring for electrode made of NiCl_2-EGIC differs significantly from that for the original NiCl_2-GIC. The conversion of NiCl_2-GlC to NiCl_2-EGIC reveals new possibilities of practical use of the electrode, in which the Ni(II) → Ni reduction reaction and hydrogen sorption occur simultaneously. The obtained results have shown that the anodic charge increases on increasing the time of hydrogen sorption at a given potential and on decreasing the potential of hydrogen sorption. From comparison, one can conclude that the surplus charge measured during the anodic run is associated with the oxidation reaction of hydrogen stored in NiCl_2-EGlC during the precedent reduction reaction resulting in the generation of electrochemically active nickel clusters in exfoliated graphite matrix. It was shown that the diffusion rate of hydrogen ions to/in the structure of NiCl_2-EGIC exerts important influence on the kinetics of hydrogen storage.
机译：这项研究的目的是检查在碱性溶液中发生的电极，该电极由石墨与氯化镍的层间化合物（NiCl_2-GIC）和脱落的石墨与氯化镍的层间化合物（NiCl_2-EGIC）制成。与大多数受体石墨插层化合物（GIC）在热处理时容易剥落相反，即使在非常高的温度下进行处理，NiCl_2-GIC仍具有耐热性。 NiCl_2-GlC在室温下通过化学方法在过氧化氢溶液中成功剥离。通过XRD和SEM技术检查剥离的效果。如这些技术所示，剥离后，一部分NiCl_2嵌入层保留在石墨晶格中。使用循环伏安法表明，NiCl_2-EGIC制成的电极发生的电化学还原过程与原始NiCl_2-GIC明显不同。 NiCl_2-GlC到NiCl_2-EGIC的转化揭示了电极实际应用的新可能性，其中Ni（II）→Ni还原反应和氢吸附同时发生。所得结果表明，在给定电势下增加氢吸附时间并在降低氢吸附电势时，阳极电荷增加。通过比较，可以得出结论，在阳极运行过程中测得的过剩电荷与先行还原反应期间NiCl_2-EGlC中存储的氢的氧化反应有关，从而导致片状石墨基体中产生电化学活性镍簇。结果表明，氢离子扩散到/在NiCl_2-EGIC结构中的扩散速率对储氢动力学有重要影响。

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