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In practical applications,Mg-based hydrogen-storage materials may be exposed to the air or alow-purity-gas environment with particularly oxygen as impurity.In this paper,the influence of a micro-amount of oxygen on the performance of desorption of MgH2 hydrogen storage materialhas beenstudied by placing samples in an argon-filled glove box(at atmospheric pressure)with 1000 ppm oxygen concentration.The hydrogen capacity and desorption kinetics were measuredbyusing ahigh-pressure and high-temperature gas-adsorption analyzer.The samples were characterized by X-ray diffraction.It isfound that thedesorption of MgH2improves significantlyby amicro-amount of oxygen,especially at high temperature.