Competitive adsorption, halide anions

We consider competitive chemisorption of anions and cations at a fixed array of adsorption sites on an electrode surface in terms of a voltage-dependent ideal thermodynamic equilibrium. For simplicity, we consider systems with sufficiently high electrolyte conductivity that all the interface voltage drop is across a single layer of chemisorbed ions at the polarized electrode surface. This seems a reasonable initial assumption for most conductive electrode materials and for the fused and solid silver halides cited above. 

Fe(0H)2)ajg, (Fe(OHA))j,j, and (FeA2)ads- The kinetics of iron dissolution in the active range in the presence of halide ions X is largely dominated by the competitive adsorption of X [88] with the dissolution activating OH. A critical survey of the possible reaction paths in which Cl competes with other anion adsorption is given in Ref 73. The mechanism is claimed to depend on the pH range. The catalytic step of dissolution in Cl-flee media [63] is considered to become at medium acidities (pH > 0.6) ... 

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