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| Effect of Surface Treatment with Different Alkaline Solutions on Rare Earth-Magnesium-Nickel Based Hydrogen Storage Alloy |
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| Abstract: The rare earth-Mg-Ni (RE-Mg-Ni) based hydrogen storage alloy was treated in the same concentration of 6 mol·L-1 LiOH, NaOH, and KOH aqueous solutions. The effects of different alkaline solutions and the treating times on the morphologies and compositions of the alloy surfaces and the electrochemical characters of the alloy electrodes have been investigated. The alloy electrode treated in 6 mol·L-1 NaOH for 10 min shows the best electrochemical properties. LiOH solution could remove Mg element and diminish the oxygen species on the alloy surface effectively. The alloy surface layer formed in LiOH solution was more unfavorable for H adsorption and desorption but had good resistance for further corrosion. The alloy electrode treated with 6 mol·L-1 LiOH had the best cyclic durability. With the increase of the treating time, the reduction of the discharge capacity was the largest for the alloy electrode treated with 6 mol·L-1 NaOH solution because of the dissolution of a large amount of rare earth (RE) and Al elements, and the loose surface layer containing mainly rare earth hydroxides. |
| Keywords: nickel metal hydride battery hydrogen storage alloy surface treatment rare earth-magnesium-nickel based |
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| YUAN Hui-Ping,JIANG Li-Jun.Effect of Surface Treatment with Different Alkaline Solutions on Rare Earth-Magnesium-Nickel Based Hydrogen Storage Alloy[J].Chinese Journal of Inorganic Chemistry,2018,34(12):2271-2279. |
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