Abstract
An in situ hydrogen generation and storage technique is demonstrated during the electrodeposition of hexagonal closed pack (HCP) nickel from NiCl 2-1-ethyl-3-methylimidazolium chloride (NiCl 2-EmimCl) and NiCl 2·6H 2O-1-ethyl-3-methylimidazolium chloride (NiCl 2·6H 2O-EmimCl) melts. During electrolysis, the dissolution of hydrogen in nickel takes place due to the electrolysis of water. This results in the production of HCP nickel. The hydrogen content of the electrodeposited nickel from NiCl 2-EmimCl was found to be 1.2 wt.%. Thermal analysis showed that the phase transformation from HCP nickel to FCC occurred at 462 °C, releasing hydrogen in the process.
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