Issue 28, 2025

Pt-cathode hydrogen evolution enabled by low-potential [Co(en)3]-intercalated layered MnO2 anodes on bamboo and CNT composite films

Abstract

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.

Graphical abstract: Pt-cathode hydrogen evolution enabled by low-potential [Co(en)3]-intercalated layered MnO2 anodes on bamboo and CNT composite films

Supplementary files

Article information

Article type
Paper
Submitted
07 May 2025
Accepted
21 Jun 2025
First published
26 Jun 2025

Dalton Trans., 2025,54, 10961-10972

Pt-cathode hydrogen evolution enabled by low-potential [Co(en)3]-intercalated layered MnO2 anodes on bamboo and CNT composite films

R. Sasaki, R. Okiguchi, A. Senuma and K. Tomono, Dalton Trans., 2025, 54, 10961 DOI: 10.1039/D5DT01069A

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