Advances in photo-assisted seawater splitting promoted by green iron oxide-carbon nitride photoelectrocatalysts - Archive ouverte HAL
Article Dans Une Revue Journal of Materials Chemistry A Année : 2023

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

Résumé

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-Fe$_2$O$_3$ 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 Fe$_2$O$_3$/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 Fe$_2$O$_3$ functionalization with both gCN and CoPi. These amenable results, directly dependent on the electronic interplay at Fe$_2$O$_3$/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

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Autre Catalyse
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hal-04304869 , version 1 (03-06-2024)

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Mattia Benedet, Gian Andrea Rizzi, Oleg Lebedev, Vladimir Roddatis, Cinzia Sada, et al.. Advances in photo-assisted seawater splitting promoted by green iron oxide-carbon nitride photoelectrocatalysts. Journal of Materials Chemistry A, 2023, 11 (40), pp.21595-21609. ⟨10.1039/D3TA04363K⟩. ⟨hal-04304869⟩
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