Abstract

Polymeric carbon nitrides (C 3N 4) 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. Graphical Abstract: [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)42-51
Number of pages10
JournalElectrocatalysis
Volume15
Issue number1
Early online date11 Nov 2023
DOIs
Publication statusPublished - 31 Jan 2024

Data Availability Statement

Data and materials are available from the authors.

Funding

S.F.B. thanks to the financial support of the CAPES Foundation for a sandwich doctorate scholarship (CAPES-PRINT Process 88887.465542/2019-00). L.H.M. thanks to FAPESP (2017/11986-5, 2020/14741-6, 2014/50249-8). Y.Z. (201809350006) is grateful to the China Scholarship Council for a PhD scholarship.

FundersFunder number
Fundação de Amparo à Pesquisa do Estado de São Paulo
Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior88887.465542/2019-00
China Scholarship Council201809350006
Centros de Pesquisa, Inovação e Difusão, Fundação Amazônia Paraense de Amparo à Pesquisa2020/14741-6, 2014/50249-8, 2017/11986-5

    Keywords

    • Biomass
    • Hydrogen
    • Intrinsic Microporosity
    • Photocatalysis
    • Photofuel cell

    ASJC Scopus subject areas

    • Electrochemistry

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