Effect of Boron Addition on the Differential Capacitance of Stress- Annealed Pyrolytic Graphite
CASE WESTERN RESERVE UNIV CLEVELAND OH ELECTROCHEMISTRY RESEARCH LAB
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The non-faradaic differential electrode capacity of the basal plane of boronated stress-annealed pyrolytic graphite with 0.3 weight boron was studied in aqueous solution using an a.c. impedance bridge and compared to results previously obtained on the non-boronated material. On boronated graphite the potential of the minimum in the capacity-potential curve shifts negative by about 0.5 V relative to that for the non-boronated material. This shift is in agreement with the semiconductor interpretation proposed previously for the capacitance of the basal plane of the non-boronated material. The capacity of the minimum for the boronated material compared favorably with that estimated from the carrier concentration for the space charge region in the electrode phase.
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