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- W2006337997 abstract "The effects of etching with HCl on the hydrogen sorption properties of Mg2Ni have been investigated. On being etched with HCl, Mg2Ni can be activated and hydrided easily at room temperature and its low temperature desorption kinetics are improved. However, its hydriding is incomplete at room temperature and its room temperature hydrogen absorption capacity degrades rapidly on cycling. X-ray photoelectron spectroscopy, X-ray diffraction and scanning electron microscopy analyses show that the etching treatment removes the magnesium oxide overlayer and preferentially dissolves away magnesium; this results in a new surface layer composed mainly of porous, metallic nickel microspheres. We believe that the nickel microspheres act as the active catalyst for hydrogen absorption and desorption at lower temperatures. The incomplete hydriding and the cycling degradation of the hydrogen absorption capacity at room temperature are caused, we suggest, by the cracking and disintegration of the alloy powder on each cycle, with the newly generated surfaces deactivating very quickly." @default.
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- W2006337997 date "1991-08-01" @default.
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- W2006337997 title "The effects of etching with HCl on the hydrogen sorption properties of Mg2Ni" @default.
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- W2006337997 doi "https://doi.org/10.1016/0022-5088(91)90215-p" @default.
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