Surface science studies of model fuel cell electrocatalysts

Interfacial processes involving electrocatalytic evolution and oxidation of H2, and the role of chemisorbed H

Temperature-dependent hydrogen electrochemistry on platinum low-index single-crystal surfaces in acid solutions

The structure and orientation of water molecules at a highly ordered Au(111) electrode surface in perchloric acid have been investigated in-situ as a function of applied potential by means of surface-enhanced infrared absorption spectroscopy. This newly developed infrared spectroscopy technique enables the observation of the electrode/electrolyte interface at a very high sensitivity without interference from the bulk solution. The spectrum of the interfacial water significantly differs from that of bulk water and drastically changes in peak frequencies and band widths around the potential of zero charge (pzc) of the electrode and at about 0.3 V positive from the pzc. The interfacial water molecules are weakly hydrogen-bonded at potentials below the pzc and form a strongly hydrogen-bonded ice-like structure at potentials slightly above the pzc. The ice-like structure is broken at more positive potentials due to the specific adsorption of perchlorate ion, where one OH moiety of water is non-hydrogen-bonded ...

Potential-Dependent Reorientation of Water Molecules at an Electrode/Electrolyte Interface Studied by Surface-Enhanced Infrared Absorption Spectroscopy

J.W. Russell

Papers

Electrochemically modulated infrared spectroscopy (EMIRS): Experimental details

Structural investigation by infra-red spectroscopy of adsorbed hydrogen on platinum

IR vibrational spectroscopy of species in the electrode-electrolyte solution interphase

Structural investigation by electrochemically modulated infrared spectroscopy of adsorbed hydrogen on rhodium