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Journal Article

Advances in photo-assisted seawater splitting promoted by green iron oxide-carbon nitride photoelectrocatalysts

Authors

Benedet,  Mattia
External Organizations;

Rizzi,  Gian Andrea
External Organizations;

Lebedev,  Oleg I.
External Organizations;

/persons/resource/roddatis

Roddatis,  Vladimir
3.5 Interface Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Sada,  Cinzia
External Organizations;

Wree,  Jan-Lucas
External Organizations;

Devi,  Anjana
External Organizations;

Maccato,  Chiara
External Organizations;

Gasparotto,  Alberto
External Organizations;

Barreca,  Davide
External Organizations;

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Fulltext (public)

5025018.pdf
(Publisher version), 3MB

Supplementary Material (public)
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Citation

Benedet, M., Rizzi, G. A., Lebedev, O. I., Roddatis, V., Sada, C., Wree, J.-L., Devi, A., Maccato, C., Gasparotto, A., Barreca, D. (2023): Advances in photo-assisted seawater splitting promoted by green iron oxide-carbon nitride photoelectrocatalysts. - Journal of Materials Chemistry A, 11, 40, 21595-21609.
https://doi.org/10.1039/D3TA04363K


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5025018
Abstract
Solar-driven seawater electrolysis for hydrogen fuel production holds an outstanding potential towards the development of a carbon-neutral and sustainable energy infrastructure, but the development of green, efficient and stable photoelectrocatalysts selectively promoting oxygen evolution remains a formidable challenge. Motivated by this issue, in this work we propose a tailored combination of two economically viable materials, α-Fe2O3 and graphitic carbon nitride (gCN), to fabricate promising anodes – eventually decorated with cobalt phosphate (CoPi) particles – for alkaline seawater photosplitting. The target systems were fabricated via an original multi-step route, involving the plasma-enhanced chemical vapor deposition of iron(III) oxide on conducting glasses, the introduction of gCN in very small amounts by a rapid and facile electrophoretic process, and final annealing in air. A comprehensive characterization revealed the successful fabrication of composites featuring a tailored surface defectivity, a controlled nano-organization, and a close Fe2O3/gCN interfacial contact. After decoration with CoPi, the best performances corresponded to a Tafel slope of ≈100 mV dec−1 and overpotential values enabling us to rule out the competitive hypochlorite formation. In addition, photocurrent densities at 1.23 V vs. RHE showed a nearly 7-fold increase upon Fe2O3 functionalization with both gCN and CoPi. These amenable results, directly dependent on the electronic interplay at Fe2O3/gCN heterojunctions and on CoPi beneficial effects, are accompanied by a remarkable long-term stability, and may open up attractive avenues for clean energy production using natural resources.