A composite of single-wall carbon nanotubes and a coordination polymer of fullerene and palladium, SWCNT/(C60Pd3)(n), has been formed by polymeric phase deposition on SWCNTs dispersed in a benzene solution. The polymer is deposited on aggregates of SWCNTs in the form of spherical particles that are 50 to 200 nm in diameter. The effect of the composite composition on the morphology and capacitance properties of SWCNT/(C60Pd3)(n) has been investigated. In composites containing few carbon nanotubes, the (C60Pd3)(n) particles separate carbon nanotube aggregates into thinner structures. An increase in the SWCNT number in the composite material results in the deposition of smaller polymeric particles. The composite shows excellent capacitance properties due to the high double-layer capacitance at the composite/electrolyte interface and high polymer reduction yield, resulting in a high level of pseudo-capacitance. The polymer reduction yield increases with the increasing SWCNT amount in the composite, reaching a maximal value for material containing approximately 75 mass % of carbon nanotubes in the composite. For this deposit composition, specific capacitances of ca. 150 and 370 F g(-1) were obtained for the composite and (C60Pd3)(n) polymeric component, respectively. (C) 2016 The Electrochemical Society. All rights reserved.