CATALYTIC ELECTRODE FOR FUEL CELL OR ELECTROLYTIC CELL, AND PROCESS FOR MANUFACTURING SAID ELECTRODE

A method of preparing an array of vertically aligned carbon nanotubes for use in catalytic electrodes for fuel cell or electrolytic cell, comprising: providing an array of vertically aligned carbon nanotubes obtained by a gas phase growth process in which the precursor of a carbon nanotube growth catalyst is added continuously to the feed gas; and depositing a plurality of platinum nanodots onto the outer surface of said vertically aligned carbon nanotubes by using a gas phase deposition process such as ALD. The ALD process advantageously uses a platinum source gas which is Pt(PF). The nanodots can be protected by nanocaging.