In Situ Ni-Doped Hierarchically Porous Carbon Nanofibers Derived from Polyacrylonitrile/Pitch for Hydrogen Storage at Ambient Temperature

Fuquan Song (), Lintao Huang, Heying Ding, Shiming Zhang and Jinbiao Yu
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Fuquan Song: School of Petroleum and Natural Gas Engineering, Changzhou University, Changzhou 213164, China
Lintao Huang: School of Petrochemical Engineering and Environment, Zhejiang Ocean University, Zhoushan 316022, China
Heying Ding: School of Petrochemical Engineering and Environment, Zhejiang Ocean University, Zhoushan 316022, China
Shiming Zhang: Exploration and Development Research Institute, Shengli Oilfield Company, SINOPEC, Dongying 257015, China
Jinbiao Yu: Exploration and Development Research Institute, Shengli Oilfield Company, SINOPEC, Dongying 257015, China

Sustainability, 2023, vol. 15, issue 11, 1-13

Abstract: Porous carbon nanofibers doped with nickel (Ni) were successfully fabricated through electrospinning, carbonization, and CO 2 activation techniques using polyacrylonitrile (PAN) and petroleum pitch as carbon sources and nickel acetate as the dopant. During the activation process, Ni was reduced and dispersed in situ on the carbon matrix. The effects of Ni doping content on the morphology and structure of the carbon nanofibers were systematically investigated using SEM, TEM, XPS, XRD, Raman, and BET analyses. The experimental results revealed that the prepared materials had a hierarchically porous structure and that Ni nanoparticles played multiple roles in the preparation process, including catalyzing pore expansion and catalytic graphitization. However, particle agglomeration and fiber fracture occurred when the Ni content was high. In the adsorption/desorption experiments, the sample with 10 wt% Ni doping exhibited the highest specific surface area and micropore volume of 750.7 m 2 /g and 0.258 cm 3 /g, respectively, and had the maximum hydrogen storage capacity of 1.39 wt% at 298 K and 10 MPa. The analyses suggested that the hydrogen adsorption mechanism contributed to enhanced H 2 adsorption by the spillover effect in addition to physisorption.

Keywords: carbon nanofiber; petroleum pitch; electrospinning; hydrogen adsorption; spillover (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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