| http://www.w3.org/ns/prov#value | - In a preferred embodiment, the potential is stepped first to a positive applied potential, e.g. 0.1 to 0.2V, for a period of between 0.1 to 10 seconds, more preferably 1 to 4 seconds, for example about 1 second, and then stepped to a negative applied potential of ???0.4 to ???0.6V for an equivalent time period to that used in the first potential step, for example for a further 1 second.
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