Effect of SiO₂Coating on the CO Poisoning Resistance of ZrCo Hydrogen Storage Alloy AITranslate

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Chinese Library Classification Number:TG139.7[一般工业技术—材料科学与工程]

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In order to improve the poisoning resistance of ZrCo alloy against CO impurity gas,ZrCo alloy particles were embedded into SiO₂matrix by SiO₂sol coating method to prepare ZrCo/SiO₂composites with different mass ratios.The phase composition,micro-morphology,and elemental composition of the samples were characterized by X-ray diffractometer,scanning electron microscope,transmission electron microscope,and energy-dispersive X-ray spectrometer.The effects of CO concentration and SiO₂coating ratio on the hydrogen absorption kinetic performance of ZrCo/SiO₂were investigated by using a hydrogen storage material performance test device in a mixed H₂/CO atmosphere,and the hydrogen absorption behavior of the samples was analyzed by kinetic model.The experimental results show that ZrCo hydrogen storage alloy particles are well bonded with the SiO₂matrix and uniformly distributed in the matrix.The SiO₂coating effectively improves the hydrogen absorption rate of ZrCo alloy in H₂/CO atmosphere.When the mass ratio of ZrCo/SiO₂is 1∶1.5,it takes only 5 h for the composite to reach the saturation hydrogen absorption capacity in H₂containing 0.5%(molar ratio)CO,whereas it takes 55 h for the uncoated ZrCo.Therefore,the ZrCo/SiO₂composites have good CO poisoning resistance and certain cycling pulverization resistance.