Semiconducting Characteristics of Galena Electrodes.
Richardson PE; O'Dell CS
Proc Inter'l Symp Eletrochem in Min & Met Proc Electrochem soc 1984 84-10:20 pages
Electrochemical, interfacial capacitance, and surface photovoltage measurements were used by the Bureau of Mines in a study of oxygen reduction and xanthate chemisorption on in situ cleaved natural and synthetic lead sulfide crystals. Electrodes cleaved in nitrogen sparged 0.1M sodium tetraborate assume the flatband potential, vfbp, at the instant of cleavage, and thus the cleavage potential decreases with increasing bulk electron concentration. Highly n- type electrodes have a cleavage potential (vfbp) of approximately - 0.6 V (sce [saturated calomel electrode]), and highly p-type electrodes have a value of approximately -0.2 V (sce). The space charge is readily varied by applied potentials in the range -0.2 To - 0.6 V. The effect of the variable space charge layer on oxygen reduction and xanthate chemisorption is discussed.
Proc. Inter'l Symp. Eletrochem. in Min. & Met. Proc., Electrochem. Soc., V.84-10, 1984, pp.132-151