Abstract
Currentless deposition of precious metals, Au, Pt, Ir, Ru, Rh and Pd, on glassy carbon surfaces in LiCl-KCl eutectic at 450°C has been reported. When the electrodes are simply immersed in the melt solutions containing the metal ions, metal deposits equivalent to several atomic layers are obtained within a few minutes. Chronopotentiometric stripping of deposited metals and the decays of open-circuit potentials during the soaking experiments strongly suggest that the deposition is related to the surface redox properties of carbon substrates. Interpretation of the deposition process based on the mixed potential concept is presented, and the substrate reactivity derived from the deposited amount is ascribed to the surface redox reactions involving bulk O2− ions, superficial water and surface functional groups.
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