| http://www.w3.org/ns/prov#value | - In the laboratory, the counter electrode 15 is made of any conductive material, however the lower the conductive resistance the better the effect, such as a copper, a silver, a nickel, a graphite, a carbon, a gold, a platinum or other conductive materials, or can be a conductive membrane electrode formed by printing a carbon paste or a silver paste.
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