Simple electroless solutions plating have been applied to Mg2Ni alloy: (i) Ni-plating solution using NiSO4+NaPH2O2+NaH2C 6H5O7, (ii) a reducing solution using NaPH2O2+NaH2C6H5O 7, and (iii) acid solution consisting of CuSO4+H2SO4. The electrochemical characteristics and performance of thus modified electrodes were examined using cyclic voltammetry, and electrochemical impedance spectroscopy techniques with the microelectrode technique focusing on a single particle of the alloy. The results show that all applied surface modifications have significantly improved the electrocatalytic activity of the Mg2Ni towards hydrogen absorption/adsorption processes compared to the untreated alloy. Among all the treated samples, the highest discharge capacity of 320 mAh/g, and the lowest charge-transfer resistance were obtained with Mg2Ni alloy treated by copper plating method.
|Number of pages
|Journal of New Materials for Electrochemical Systems
|Published - 2002
- MgNi alloy
- Rechargeable metal hydride battery
- Single particle electrode
- Surface modification