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NaAlH4 dehydrogenation properties enhanced by MnFe2O4 nanoparticles
Wan, Qi; Li, Ping; Li, Ziliang; Zhao, Kuifei; Liu, Zhiwei; Wang, Ling; Zhai, Fuqiang; Qu, Xuanhui; Volinsky, Alex A.
Universitat Politècnica de Catalunya. GCM - Grup de Caracterització de Materials
The catalytic effects of MnFe2O4 nanoparticles on the dehydrogenation properties of NaAlH4, prepared by ball milling, are investigated. The onset temperatures for NaAlH4 + 7 mol% MnFe2O4 are 95 C, 152 C and 327 C for the three dehydrogenation steps, significantly lower compared with as-received NaAlH4. The isothermal dehydriding kinetics shows that adding MnFe2O4 to NaAlH4 could significantly enhance the desorption kinetics of NaAlH4, 7 mol% MnFe2O4-doped sample also displays the well-maintained kinetics and only a slight capacity loss for the three cycles. From the differential scanning calorimetry and the Kissinger desorption kinetics analysis, the apparent activation energy of the 7 mol% MnFe2O4-doped sample for the three steps is 57.74 kJ mol(-1), 75.06 kJ mol(-1) and 117.22 kJ mol(-1), resulting in 56.05 kJ mol(-1), 67.53 kJ mol(-1) and 59.12 kJ mol(-1) reduction, respectively, compared with the as-received NaAlH4. Based on the Fourier Transform Infrared Spectroscopy, X-ray diffraction and X-ray photoelectron spectroscopy, Fe0.9536O and amorphous Mn or Mn-containing species together play a synergistic role in remarkably improving NaAlH4 dehydriding properties
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria dels materials
Nanoparticles
Manganese ferrite
Hydrogen storage
Sodium alanate
Dehydriding temperature
Apparent activation energy
Nanopartícules
info:eu-repo/semantics/publishedVersion
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