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Article Abstract
A layered manganese dioxide (MnO) film with [Co(en)] intercalated as the gallery ion was fabricated on a carbon-based composite coating obtained by co-kneading bamboo charcoal and carbon nanotubes, followed by electrodeposition. Linear sweep voltammetry of the resulting [Co(en)]@MnO film displayed anodic current maxima at +0.08, +0.56, and +1.10 V Ag/AgCl. Potentiostatic electrolysis at +1.10 V generated gas at the platinum counter electrode (cathode) opposite the MnO anode. Gas-chromatographic analysis identified the product as hydrogen, released at a rate of 0.14 mL h from a 1.0 cm Pt substrate under the applied potential. No visible oxygen bubbles were detected at the [Co(en)]@MnO anode, indicating that continuous hydrogen evolution at the cathode proceeds through the primary reduction of MnO by the interlayer [Co(en)] ions together with a secondary reduction of [Co(en)] by water molecules.
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