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a) Schematic depictions of the preparation of a cobalt pyrite (CoS2) film, microwire array, or nanowire array on a graphite disk substrate. b) Electrochemical characterization of CoS2 film, microwire (MW) array, and nanowire (NW) array electrodes for HER electrocatalysis. Reproduced with permission.27 Copyright 2014, American Chemical Society.
