Novel dense graphene foams were fabricated by directly growing graphene on nickel templates by chemical vapor deposition. The as-grown graphene foam showed a hierarchical structure consisting of graphene microspheres with nano pores as flower-like morphology. The high quality of the graphene foam was confirmed by Raman spectrum and conductivity measurement as high as 5100 S m⁻¹. To test its potential application in lithium ion battery, the monolithic graphene foam hybridized with TiO₂ nanoparticles as anode material was synthesized via atomic layer deposition. The electrode exhibited high specific capacity (204 mAh g⁻¹, 91 mAh g⁻¹) even at high current (20 C, 60 C, respectively, 1 C = 335 mA g⁻¹) with good stability and reversibility. The outstanding electrical performance could be attributed to the flower-like dense porous nanostructure in the graphene foam, which would work not only as a highly conductive host matrix for ion and electron transportation, but also effectively buffer the volume expansion during the lithiation and delithiation process.

中文翻译：

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通过化学气相沉积直接在镍模板上生长的新型花状石墨烯泡沫

通过化学气相沉积直接在镍模板上生长石墨烯来制造新型致密的石墨烯泡沫。刚生长的石墨烯泡沫表现出由具有纳米孔的石墨烯微球组成的分层结构，呈花状形态。通过拉曼光谱和电导率测量证实了石墨烯泡沫的高质量，其高达5100 S m ^-1。为了测试其在锂离子电池中的潜在应用，通过原子层沉积合成了以TiO ₂纳米颗粒为负极材料的整体式石墨烯泡沫。电极显示出高的比容量（204毫安克^-1，91毫安克^-1），即使在高电流（20℃，60℃，分别为1 C =335毫安克^-1），具有良好的稳定性和可逆性。优异的电性能归因于石墨烯泡沫中的花状致密多孔纳米结构，它不仅可以作为离子和电子传输的高导电基质，而且可以有效地缓冲锂化和脱锂过程中的体积膨胀。