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Keywords:

  • hydrogen storage;
  • glass-ceramic material;
  • crednerite;
  • PCT;
  • X-Ray Diffraction

SUMMARY

Crednerite glass-ceramic material (CuMnO2) has been investigated for the first time as a hydrogen storage candidate. The average gravimetric capacity is about 16 g H2/kg and about 50 g H2/kg of CuMnO2 at 473 and 573 K respectively under a pressure up to 20 bars. The hydrogen adsorbed capacity (weight percent) of CuMnO2 increased with increasing temperature. The material doesn't release hydrogen during desorption cycle revealing storage of hydrogen in the prepared material. X-ray diffraction patterns reveal a structure corresponding to Cu2O, CuMnO2, and traces of CuO and SiO2 phases. X-ray diffraction patterns exhibit a reduction of copper ions to copper metal beside cristobalite and traces from manganese oxide phase after exposing to H2 at 80 and 573 K. This reduction of Cu ions into Cu metal may explain the irreversibility of hydrogen adsorption process. Thermal stability detected by differential scanning calorimetry and thermal gravimetric analysis shows decomposition temperature up to ~473 K followed by gain of weight till 1173 K then another decomposition till 1273 K. Copyright © 2013 John Wiley & Sons, Ltd.