A process to deposit a conformal coating of manganese oxide nanocrystals within a high surface area connected pore structure of a carbon paper electrode. A two-step process is utilized. In the first step the carbon paper electrode is immersed in an alkaline manganese oxide solution to form a nanocrystal seed layer on the surface and within the pores of the carbon paper. In the second step the seeded carbon paper is immersed in an acidic manganese oxide solution. The result is a densely packed continuous conformal nanocrystal coating both on the surface of the carbon and deep within its pores. The carbon paper is highly suitable for use as an electrode in a supercapacitor.
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