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Hydrogen storage in a rare-earth perovskite-type oxide La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_3 for battery applications

John Henao  Oscar Sotelo  Maura Casales-Diaz  Lorenzo Martinez-Gomez  
【摘要】:Recently, rare-earth perovskite-type oxides with the general formula ABO_3(A rare earth element, B transition metal, O oxygen) are regarded as promising materials for Ni/oxide batteries due to their hydrogen storage ability. In the present study, the hydrogen storage properties of the rare-earth perovskite-type oxide La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_3 were evaluated in alkaline solution and at various temperatures. The hydrogen storage properties were investigated electrochemically by applying galvanostatic charge/discharge currents. Electrochemical pressurecomposition-temperature isotherms were constructed using the Nernst equation. The exchange current density and proton hydrogen diffusion coefficient were calculated using linear polarization measurements and the potential-step method, respectively. Interestingly, the maximum hydrogen absorption capacity, re-calculated from the electrochemical capacity, is 1.72 wt% at 333 K and 6 mol·L~(-1)KOH. In addition, the hysteresis value, calculated from pressure-composition-temperature isotherms, was429 J·mol~(-1) at 333 K,while the self-discharge rate was about 25% after 24-h storage at open circuit and at 333 K.

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