Improvement in electrochemical performances of Mm(NiCoMnAl)_5 electrodes by surface modification

摘要

All metal elements on the surface of the hydrogen storage alloys exist in oxide state. The ox- ide layer on the surface of alloys affects the electrochemical performances of metal hydride (MH) electrodes. The surface of MH electrode was modified by immersing in 0.05 mol/L KBH_4 + 6 mol/L KOH or 0.2 mol/L NaH_2PO_2 + 6 mol/L KOH solution. It is found that their electrochemical properties such as discharge capacity, Activation and cyclic stability are apparently improved.