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Pt-cathode hydrogen evolution enabled by low-potential [Co(en)3]-intercalated layered MnO2 anodes on bamboo and CNT
Ryo Sasaki1, Riku Okiguchi1, Ayuri Senuma1
1Department of Materials and Life Science, Graduate School of Engineering, Kanto Gakuin University, 1-50-1 Mutsuura-higashi, Kanazawa-ku, Yokohama, Kanagawa 236-0037, Japan. tomono@kanto-gakuin.ac.jp.
None:
A layered manganese dioxide (MnO2) film with [Co(en)3] 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)3]@MnO2 film displayed anodic current maxima at +0.08, +0.56, and +1.10 V versus Ag/AgCl. Potentiostatic electrolysis at +1.10 V generated gas at the platinum counter electrode (cathode) opposite the MnO2 anode. Gas-chromatographic analysis identified the product as hydrogen, released at a rate of 0.14 mL h-1 from a 1.0 cm2 Pt substrate under the applied potential. No visible oxygen bubbles were detected at the [Co(en)3]@MnO2 anode, indicating that continuous hydrogen evolution at the cathode proceeds through the primary reduction of MnO2 by the interlayer [Co(en)3] ions together with a secondary reduction of [Co(en)3] by water molecules.
