Hydrogen-mediated photoelectrocatalysis with nickel-modified poly(heptazine 
imides)

Blaskievicz, Sirlon F.; Teixeira, Ivo; Mascaro, Lucia H.; Carta, Mariolino; McKeown, Neil B.; Zhao, Yuanzhu; Marken, Frank

doi:10.1007/s12678-023-00852-9

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Hydrogen-mediated photoelectrocatalysis with nickel-modified poly(heptazine imides)

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Teixeira, Ivo
Markus Antonietti, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Citation

Blaskievicz, S. F., Teixeira, I., Mascaro, L. H., Carta, M., McKeown, N. B., Zhao, Y., et al. (2024). Hydrogen-mediated photoelectrocatalysis with nickel-modified poly(heptazine imides). Electrocatalysis, 15(1), 42-51. doi:10.1007/s12678-023-00852-9.

Cite as: https://hdl.handle.net/21.11116/0000-000D-F1F7-C

Abstract

Polymeric carbon nitrides (C₃N₄) are photochemically active organic semiconductors that can be produced in a wide range of structural types. Here, a poly-(heptazine imide) containing nickel single atoms (Ni-PHI) is employed for photochemical hydrogen production and is compared to the non-nickel-doped semiconductor. Film deposits are formed on a platinum disk electrode (to detect hydrogen) and a coating of the molecularly rigid polymer of intrinsic microporosity PIM-1 is applied to (i) mechanically stabilize the photo-catalyst film without impeding photocatalysis and (ii) assist in the interfacial hydrogen capture/oxygen suppression process. In the presence of hole quenchers such as methanol or ethanol, anodic photocurrents linked to hydrogen production/oxidation are observed. A comparison with an experiment on glassy carbon confirms the formation of interfacial hydrogen as a mediator. The effects of hole quencher concentration are evaluated. The system Pt/Ni-PHI/PIM-1 is employed in a single-compartment photo-fuel cell.