Abstract
Thin porous layers of palladium deposited onto gold or Pd bulk metal treated by cathodic reduction in the presence of CsI under super-dry conditions were tested to establish their reactivity towards electrolytes. Specifically, an iono-metallic layer [Pd4−, TMA+ {TMABF4}] was found to be generated in tetra-alkylammonium salts, especially TMA+, BF4−. This material is then taken as a starting substrate for in situ exchange between BF4− and many electrogenerated organic acceptor anions. Importantly, the list includes doped graphene and electro-active conducting organic polymers in their basic form. Thus, for example, an intriguing Pd–graphene layer can be created as a relatively thick interface, and may be either doped or un-doped, depending on the applied potential. The method was also shown to work with many organic acceptors (coronene, anthraquinone, etc.) immobilized in their reduced state. The proposed method suggests a new strategy for building stable composite materials of considerable interest for use as electrodes and/or in 3D redox applications.
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