Facile fabrication of N/O co-doped activated carbon hollow fibers for hydrogen storage at atmospheric pressure

作者：Yu, Junwei; Chen, Feifei; Yan, Shuhan; Qiao, Kun; Zhao, Shengyao; Zhao, Xian^*; Zhu, Bo^*

来源：Polymer Bulletin, 2023, 80(2): 1385-1397.

DOI：10.1007/s00289-022-04080-x

• Activated carbon hollow fiber
• Polyacrylonitrile
• Skin-core structure
• Hydrogen storage

Polyacrylonitrile-based nascent fibers (PAN-NFs) with skin-core structure are commonly inferior fiber or waste fiber, which often abundanted in the industrial production process of polyacrylonitrile (PAN)-based carbon fibers. At present, the related research about the skin-core structure of PAN fiber mainly focuses on its regulation and elimination. Based on the different activation difficulty between skin part and core part, we proposed a new way to prepare activated carbon hollow fiber from PAN-NFs with skin-core structure. Phosphoric acid activation process is used in the facile fabrication of nitrogen, oxygen co-doped activated carbon hollow fiber (N/O-ACHF). The synthetic N/O-ACHF has the structural characteristics of smooth outer wall, while the inner wall is densely covered with micrometer-scale macropores (0.31-2.18 mu m) and abundant micropores/mesopores (0-6 nm), which provides excellent structural conditions for hydrogen storage at atmospheric pressure. S-BET, micropore volume, surface oxygen heteroatom content and surface nitrogen heteroatom content of N/O-ACHF are 545.72 m(2)/g, 0.188 cm(3)/g, 15.26 at% and 4.06 at%, respectively. The multistage pore structure and abundant surface functional groups provide excellent physical structure conditions for hydrogen storage. The preparative N/O-ACHF delivers a high hydrogen storage density of 1.35 wt% at atmospheric pressure.

• 单位
  山东大学