Furan and Pyran Functional Groups Driven the Surface of Nitrogen‐Doped Nanofiber Sponges,ChemNanoMat

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Furan and Pyran Functional Groups Driven the Surface of Nitrogen‐Doped Nanofiber Sponges
ChemNanoMat ( IF 2.6 ) Pub Date : 2020-03-18 , DOI: 10.1002/cnma.201900729
M.Sc. Juan L. Fajardo‐Díaz ₁ , M.Sc. Cristina L. Rodríguez‐Corvera ₁ , Ph.D. Emilio Muñoz‐Sandoval ₁ , Ph.D. Florentino López‐Urías ₁

Affiliation

Highly surface oxidized, nitrogen‐doped, and nitrogen functionalized carbon nanotube sponge (N‐CFS) were produced at 1020 °C using two sprayers approach in an aerosol‐assisted chemical vapor deposition (AACVD) experiment. The structure of N‐CFS consisted of entangled and corrugated carbon nanofibers of ∼200 nm diameter, also showing junctions and knots. TEM characterizations revealed that the carbon nanofiber exhibits stacked graphitic layers in a transversal way with positive curvature. Superficial chemical analysis by XPS showed that the N‐CFSs contain an atomic concentration of oxygen and nitrogen of 9.2% and 2.9%, respectively. The high‐resolution XPS scans deconvolution‐analysis revealed high percentages for C−O bonds, pyrrolic nitrogen doping, NH₃ functionalization, and Si−C interactions. The cyclic voltammetry measurements did not display a redox process despite the high oxygen concentration at the surface. Hydrophobic functional groups containing C−O bonds do not participate in a redox process (furan, pyran, epoxy, methoxy, ethoxy, among others) could mostly determine the electroactivity of N‐CFS. Based on density functional theory calculations, we determine that the furans transfer a high amount of electron and promote a positive curvature in thin carbon nanotubes. Graphitic materials with furans, pyrans, and epoxy functional groups could be used as an anode in lithium‐ion batteries.

中文翻译：

呋喃和吡喃官能团推动了掺氮纳米纤维海绵的表面

在气溶胶辅助化学气相沉积（AACVD）实验中，使用两个喷雾器方法在1020°C下生产了高度表面氧化，氮掺杂和氮官能化的碳纳米管海绵（N-CFS）。N-CFS的结构由直径约200 nm的缠结和波纹状碳纳米纤维组成，也显示出结点和结。TEM表征表明，碳纳米纤维以横向弯曲的方式呈现正曲率堆叠的石墨层。XPS的表面化学分析表明，N-CFS的氧和氮原子浓度分别为9.2％和2.9％。高分辨率XPS扫描解卷积分析显示出高百分比的C-O键，吡咯氮掺杂，NH ₃功能化和Si-C相互作用。尽管表面上的氧气浓度很高，但循环伏安法测量并未显示出氧化还原过程。含有C-O键的疏水性官能团不参与氧化还原过程（呋喃，吡喃，环氧，甲氧基，乙氧基等）可能主要决定N-CFS的电活性。根据密度泛函理论计算，我们确定呋喃在薄碳纳米管中转移了大量电子并促进了正曲率。具有呋喃，吡喃和环氧官能团的石墨材料可用作锂离子电池的负极。

更新日期：2020-03-18

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