Highly stable chemisorption of dyes with pyridyl anchors over TiO<sub>2</sub>: application in dye-sensitized photoelectrochemical water reduction in aqueous media

Takijiri, Kohei; Morita, Kenichi; Nakazono, Takashi; Sakai, Ken; Ozawa, Hiroki

doi:10.1039/c6cc10321a

Cited by 56 publications

(62 citation statements)

References 26 publications

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“…In the literature, catalysis with pyridine as an anchor for surface-bound catalysts is scarcely reported. Sakai and Ozawa et al 20 have constructed a photoanode with a pyridine-functionalized [Ru (bpy) 3 ] 2+ (bpy = 2,2′-bipyridine) complex as the chromophore immobilized on TiO 2 film. This photoanode was examined for the PEC oxidation of EDTA.…”

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confidence: 99%

Stabilization of a molecular water oxidation catalyst on a dye−sensitized photoanode by a pyridyl anchor

et al. 2020

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Understanding and controlling the properties of water-splitting assemblies in dye-sensitized photoelectrosynthesis cells is a key to the exploitation of their properties. We demonstrate here that, following surface loading of a [Ru(bpy)3]2+ (bpy = 2,2′-bipyridine) chromophore on nanoparticle electrodes, addition of the molecular catalysts, Ru(bda)(L)2 (bda = 2,2′-bipyridine-6,6′-dicarboxylate) with phosphonate or pyridyl sites for water oxidation, gives surfaces with a 5:1 chromophore to catalyst ratio. Addition of the surface-bound phosphonate derivatives with L = 4-pyridyl phosphonic acid or diethyl 3-(pyridin-4-yloxy)decyl-phosphonic acid, leads to well-defined surfaces but, following oxidation to Ru(III), they undergo facile, on-surface dimerization to give surface-bound, oxo-bridged dimers. The dimers have a diminished reactivity toward water oxidation compared to related monomers in solution. By contrast, immobilization of the Ru-bda catalyst on TiO2 with the 4,4′-dipyridyl anchoring ligand can maintain the monomeric structure of catalyst and gives relatively stable photoanodes with photocurrents that reach to 1.7 mA cm−2 with an optimized, applied bias photon-to-current efficiency of 1.5%.

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confidence: 99%

Stabilization of a molecular water oxidation catalyst on a dye−sensitized photoanode by a pyridyl anchor

et al. 2020

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“…3) passing through the origin. A case opposite to the above, indicates different mass transfer rates in the initial and final stages of adsorption, indicating the involvement of film diffusion in addition to intra particle diffusion [33,34]. Figure 10d shows the linear fitting plot of intra particle diffusion model.…”

Section: Photocatalytic Experiments and Kinetic Analysismentioning

confidence: 92%

“…4 a, Q e were not found to be in good match which implied that adsorption kinetics cannot be well explained by pseudo second order adsorption model [32]. Pseudo second order model presents the chemisorption process which involves the formation of relatively strong bonds with the surfaces [33].…”

Section: Photocatalytic Experiments and Kinetic Analysismentioning

confidence: 92%

Inorganic–organic nanohybrid of MoS2-PANI for advanced photocatalytic application

et al. 2019

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In this work, the fabrication of MoS 2 -Polyaniline (PANI) nanocomposites, by in situ polymerization, has been described and its application as a photocatalyst for the degradation of organic pollutants such as methylene blue (MB) and 4-chlorophenol (4-CP), has been reported. The disadvantages of MoS 2 such as poor electronic conductivity and agglomeration between the nanosheets, was overcome by intercalating 2D MoS 2 layers with 1D conducting polymer, Polyaniline (PANI). The composite material was characterised by SEM, TEM, BET, XRD, FTIR, UV-Vis spectroscopy and XPS, indicating proper intercalation between MoS 2 nanosheets and PANI. Consequently, the synthesized composites were used for the degradation of MB and 4-CP, followed by kinetic investigations to determine the rate kinetics. The photoactivity of the nanocomposite is explained by the transfer of photogenerated electrons from PANI to the CB of MoS 2 , thus preventing the direct recombination of electrons and holes. Hence, a positive synergistic effect between MoS 2 and PANI resulted in efficient photocatalytic degradation of organic dyes like MB.

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“…By contrast, hydroxamic acids and silatranes, which are less investigated, are more robust against hydrolysis and more stable over wider pH ranges (pH 2–11) 92. In addition to the groups mentioned above, Sakai and co‐workers have demonstrated that pyridine groups forming more stable surface links than the widely used carboxylic and phosphonic groups as an anchoring group on TiO 2 surfaces 114. Thiol groups are also good candidates for binding on sulfophilic metal containing photoelectrodes 41,48.…”

Section: Semiconductor/molecular Catalyst Interfacesmentioning

confidence: 99%

Hybrid Photoelectrochemical Water Splitting Systems: From Interface Design to System Assembly

Niu

Wang

et al. 2019

Advanced Energy Materials

189

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Photoelectrochemical (PEC) water splitting has attracted increasing attention due to its potential to mitigate energy and environmental issues. Hybrid PEC systems containing semiconductor photosensitizers and molecular catalysts are reported to be highly active and stable for water splitting with great potential for facilitating clean fuels production. In this review, following a showcasing of the fundamental details of hybrid PEC systems for water splitting, semiconductor/molecular catalyst interface designs are highlighted, with a focus on interfacial physicochemical interactions and binding, and interfacial energetics and dynamics for efficient charge transfer. Recent advances in hybrid system assemblies for PEC water splitting are also briefly introduced. Finally, future challenges and directions in the field of hybrid PEC water splitting for solar energy conversion are reviewed. The current review provides state‐of‐the‐art strategies for optimized interface design for creating highly active and stable PEC water splitting assemblies.

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Highly stable chemisorption of dyes with pyridyl anchors over TiO₂: application in dye-sensitized photoelectrochemical water reduction in aqueous media

Cited by 56 publications

References 26 publications

Stabilization of a molecular water oxidation catalyst on a dye−sensitized photoanode by a pyridyl anchor

Stabilization of a molecular water oxidation catalyst on a dye−sensitized photoanode by a pyridyl anchor

Inorganic–organic nanohybrid of MoS2-PANI for advanced photocatalytic application

Hybrid Photoelectrochemical Water Splitting Systems: From Interface Design to System Assembly

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Highly stable chemisorption of dyes with pyridyl anchors over TiO2: application in dye-sensitized photoelectrochemical water reduction in aqueous media

Cited by 56 publications

References 26 publications

Stabilization of a molecular water oxidation catalyst on a dye−sensitized photoanode by a pyridyl anchor

Stabilization of a molecular water oxidation catalyst on a dye−sensitized photoanode by a pyridyl anchor

Inorganic–organic nanohybrid of MoS2-PANI for advanced photocatalytic application

Hybrid Photoelectrochemical Water Splitting Systems: From Interface Design to System Assembly

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Highly stable chemisorption of dyes with pyridyl anchors over TiO₂: application in dye-sensitized photoelectrochemical water reduction in aqueous media