Potential of zero charge of a molybdenum electrode by laser ablation voltammetry

We found that a zero-current potential, ZCP, in the laser ablation voltammo gram agreed with a potential at which a differential capacitance component showed a minimum in the corresponding phase-selective ac voltammogram at th e Mo electrode in phosphate buffer. This fact suggests that the ZCP is iden tical with the potential of zero charge (pzc). A pH dependence of the ZCP f or the Mo electrode is discussed in terms of specific adsorption of a hydro xide ion.