Hybrid photoanodes for water oxidation combining a molecular photosensitizer with a metal oxide oxygen-evolving catalyst

Collomb, Marie‐Noëlle; Morales, Daniela V.; Astudillo, Catalina N.; Dautreppe, Baptiste; Fortage, Jérôme

doi:10.1039/c9se00597h

Cited by 33 publications

(23 citation statements)

References 86 publications

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“…Optical, electrochemical, and XPS experiments conrmed the formation of the dyad and, in particular, the presence of the Ru catalyst anchored to the TiO 2 photoanode via the dye linker. Both dyad-sensitized photoanodes showed state-of-the-art FE in the O 2 generation process, 8,[45][46][47] with the CBZ-3Py + Ru dyad reaching an average efficiency of nearly 90% and a best cell efficiency of 95%. Moreover, IPCE measurements conrmed the validity of the approach showing efficiencies among the best recorded for similar compounds and noticeably supported the evidence of the formation of dyads when compared to isolated dyes.…”

Section: Discussionmentioning

confidence: 99%

Dye–catalyst dyads for photoelectrochemical water oxidation based on metal-free sensitizers

et al. 2021

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Section: Discussionmentioning

confidence: 99%

Dye–catalyst dyads for photoelectrochemical water oxidation based on metal-free sensitizers

et al. 2021

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“…[152][153][154] Surprisingly, a threefold enhancement in stability was observed in ETL-free devices compared with their mesoporous metal oxide counterpart, [149][150][151] which we attributed to the elimination of OHions from water splitting under illumination of nearultraviolet (UV) light. [155][156][157][158] The mechanism of this degradation will be further discussed in Section 3. Even though ETL-free devices demonstrate better durability, their low PV performance (PCE: %13%) due to poor charge transport properties (FF ≤ 65%) Figure 3.…”

Section: Device Architecturementioning

confidence: 99%

A Perspective on the Commercial Viability of Perovskite Solar Cells

et al. 2021

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Perovskite solar cells (PSCs) have received a large amount of research funds due to their potential as a frontrunner in a new generation of solar cells; consequently, the desire to commercialize this technology is mounting. In this roadmap, the knowledge and the technological gaps between laboratory and industry are critically analyzed from the perspective of 5S criteria (Stability, Safety, Sustainability, Scalability, and Storage). To avoid any favoritism in the arguments toward commercializing this technology, herein, the average parameters of PSCs (photoconversion efficiency, durability, cost, manufacturability, and sustainability) estimated from previous studies are analyzed and discussed. Unique opportunities for PSCs in their current stage of achievements are identified, where application‐driven, instead of performance‐driven, developments are shown to favor their commercialization. Efforts required to improve the average performance of PSCs to state‐of‐the‐art levels are also identified and discussed.

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“…Most investigated photoanodes for PEC cells are based either on passivated conventional semiconductors (e.g., Si or III-V compounds) (Scheuermann et al, 2013) or on low-cost metal oxides, such as hematite (Peter et al, 2012) or bismuth vanadate (Kim and Choi, 2014). An alternative, yet much less developed, concept is represented by "hybrid photoanodes" that comprise a "soft" molecular or polymeric light absorber supported on a wide-gap metal oxide acting as an electron collector and modified with an additional cocatalyst to promote the OER from water (Youngblood et al, 2009;Kirner et al, 2014;Ashford et al, 2015;Swierk et al, 2015;Finke, 2017a, 2017b;Xu P. et al, 2017;Collomb et al, 2019;Zhang et al, 2019). A key advantage of this concept is that the wide-bandgap metal oxide support (e.g., TiO 2 ) has typically a very negative potential of the conduction band edge, which alleviates the need for large external electric bias and makes the coupling with typical photocathodes in a tandem cell more feasible.…”

Section: Introductionmentioning

confidence: 99%

Anatase-Wrapped Rutile Nanorods as an Effective Electron Collector in Hybrid Photoanodes for Visible Light-Driven Oxygen Evolution

et al. 2021

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Arrays of single crystal TiO2 rutile nanorods (RNRs) appear highly promising as electron-collecting substrates in hybrid photoanodes as the RNRs offer direct charge carriers transport pathways, contrary to the conventional electrodes prepared from TiO2 powders that suffer from the numerous charge traps at the grain boundaries. However, the specific surface area of the nanorods is highly limited by their smooth morphology, which might be detrimental in view of utilizing the RNR as a substrate for immobilizing other functional materials. In this study, we developed a novel anatase-wrapped RNR (ARNR) material fabricated by a facile seed layer-free hydrothermal method. The ARNR comprises polycrystalline anatase nanoparticles formed on the surface of RNR, resulting in a large surface area that provides more deposition sites compared to the bare nanorods. Herein, we functionalize ARNR and RNR electrodes with polymeric carbon nitride (CNx) coupled with a CoO(OH)x cocatalyst for dioxygen evolution. The anatase wrapping of the rutile nanorod scaffold is found to be crucial for effective deposition of CNx and for improved photoanode operation in visible light-driven (λ > 420 nm) oxygen evolution, yielding a significant enhancement of photocurrent (by the factor of ∼3.7 at 1.23 V vs. RHE) and faradaic efficiency of oxygen evolution (by the factor of ∼2) as compared to photoanodes without anatase interlayer. This study thus highlights the importance of careful interfacial engineering in constructing photoelectrocatalytic systems for solar energy conversion and paves the way for the use of ARNR-based electron collectors in further hybrid and composite photochemical architectures for solar fuel production.

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Hybrid photoanodes for water oxidation combining a molecular photosensitizer with a metal oxide oxygen-evolving catalyst

Abstract: Hybrid photoanodes for water oxidation, using an n-semiconductor photosensitized by a molecular dye associated with an inorganic catalyst, are overviewed.

Cited by 33 publications

References 86 publications

Dye–catalyst dyads for photoelectrochemical water oxidation based on metal-free sensitizers

Dye–catalyst dyads for photoelectrochemical water oxidation based on metal-free sensitizers

A Perspective on the Commercial Viability of Perovskite Solar Cells

Anatase-Wrapped Rutile Nanorods as an Effective Electron Collector in Hybrid Photoanodes for Visible Light-Driven Oxygen Evolution

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