TiO<sub>2</sub>-supported Pt single atoms by surface organometallic chemistry for photocatalytic hydrogen evolution

Jeantelot, Gabriel; Qureshi, Muhammad; Harb, Moussab; Ould‐Chikh, Samy; Anjum, Dalaver H.; Abou-Hamad, Edy; Aguilar‐Tapia, Antonio; Hazemann, Jean‐Louis; Takanabe, Kazuhiro; Basset, Jean‐Marie

doi:10.1039/c9cp04470a

Cited by 37 publications

(58 citation statements)

References 82 publications

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“…In this case, metal clusters appear more active than single atoms. This is also valid for Pt/TiO 2 in photocatalytic hydrogen evolution conditions, under which single Pt atoms readily aggregate [247,256,257]. Such a dramatic sensitivity of atomic dispersion to the atmosphere is increasingly characterized by electron microscopy [234,242,[258][259][260], and systems for which metal clusters are catalytically superior to single atoms are increasingly reported [257,258,[261][262][263][264].…”

Section: Sintering Redispersion Exsolutionmentioning

confidence: 80%

Restructuring effects of the chemical environment in metal nanocatalysis and single-atom catalysis

Piccolo

2021

Catalysis Today

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Metal-based heterogeneous catalysts mostly consist of supported nanoparticles of a few nanometers in size, because these objects provide a good compromise between exposed active surface area and structural stability. However, far from being static, heterogeneous catalysts constantly evolve under reaction conditions, thereby creating and removing surface sites in response to their gaseous or liquid reactive environment. Modern ex situ and in situ investigations have shown that nanocatalysts at work can face a number of deep restructuring phenomena, such as morphological change, compound formation, segregation, leaching, as well as redispersion and other metal-support interaction effects. Recently emerging single-atom catalysts are -like subnanometric clusters -especially sensitive to their chemical environment. Using examples from the recent literature with a particular emphasis on operando characterization studies, this article reviews the main dynamic effects induced by the reaction medium on nanocatalysts (including nanoalloy catalysts) and single-atom catalysts.

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Section: Sintering Redispersion Exsolutionmentioning

confidence: 80%

Restructuring effects of the chemical environment in metal nanocatalysis and single-atom catalysis

Piccolo

2021

Catalysis Today

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“…The resulting rate for the photocatalytic hydrogen evolution reaction (PHER) is therefore increased. Several noble metal co-catalysts were reported in the literature (with Pt, the most studied) [5][6][7][8][9][10][11][12] as well as oxides [13][14][15] or transition metal sulfides co-catalysts [16][17][18][19][20][21][22][23][24]. However, no photocatalytic system is efficient enough to produce sustainable H 2 at a reasonable cost.…”

Section: Table Of Content Introductionmentioning

confidence: 99%

Photocatalytic production of H2 is a multi-criteria optimization problem: Case study of RuS2/TiO2

et al. 2021

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Many parameters influence the photocatalytic production of H 2. Identifying and quantifying them is necessary for correct comparison of photocatalysts and right understanding of involved mechanism. In this work, we studied the photocatalytic dehydrogenation of isopropanol with titania-supported ruthenium disulfide. We studied the influence of seven parameters on the photocatalytic activity: the temperature, the composition of the reactive mixture, the mass of the photocatalyst, the flux and the energy of the incident photons, the co-catalyst loading and the nature of the support. Their influence was studied, not only on the rate of hydrogen production (or photon yield) but also on the apparent activation energy and on the preexponential factor, deduced from an Arrhenius law. The photon yield as a function of the co-catalyst loading show an optimum of activity. A 6.9 % photon yield was obtained at 0.84 wt% and = 3.65. The rate-determining step for the photocatalytic dehydrogenation of the isopropanol with RuS 2 /TiO 2 is, at optimal conditions, the electron transfer from TiO 2 to RuS 2. The latter is not favored because of the band diagrams of RuS 2 and TiO 2. The electron transfer can be optimized working with incident photons having a higher energy, thanks to a hot carrier effect observed in RuS 2 /TiO 2 .

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“…13 , 14 Lately, facet engineering has become an effective way to tune the semiconductor photoanode characteristics and thus improving its photocatalytic activity. 15 − 17 A recent study on facet-engineered WO 3 electrode for photoelectrochemical hydrogen generation from natural seawater has given an average rate of 38.18 μmol h –1 . 18 …”

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confidence: 99%

Significant Impact of Exposed Facets on the BiVO₄ Material Performance for Photocatalytic Water Splitting Reactions

Lardhi

Cavallo

Harb

2020

J. Phys. Chem. Lett.

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The impact of the four predominant (010), (110), (001), and (121) exposed facets obtained experimentally for monoclinic BiVO 4 on its photocatalytic performance for water splitting reactions is investigated on the basis of the hybrid density functional theory including the spin–orbit coupling. Although their electronic structure is similar, their transport and redox properties reveal anisotropic characters based on the crystal orientation and termination. The particular role of each facet in proton reduction was correlated with the surface Bi coordination number and their geometrical distribution. Our work predicts the (001) facet as the only good candidate for both HER and OER, while the (010) facet is a fitting candidate for OER only. The (110) and (121) surfaces are acceptable candidates only for OER but less potential than (001) and (010). These outcomes will efficiently conduct experimentalists for an attentive design of facet-oriented BiVO 4 samples toward improving water oxidation and proton reduction.

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TiO₂-supported Pt single atoms by surface organometallic chemistry for photocatalytic hydrogen evolution

Abstract: Platinum single atoms are grafted by SOMC on morphology-controlled TiO2. Their structure is characterized by EXAFS and other techniques, and their activity and stability in HER and backwards reaction are studied and compared to Pt nanoparticles.

Cited by 37 publications

References 82 publications

Restructuring effects of the chemical environment in metal nanocatalysis and single-atom catalysis

Restructuring effects of the chemical environment in metal nanocatalysis and single-atom catalysis

Photocatalytic production of H2 is a multi-criteria optimization problem: Case study of RuS2/TiO2

Significant Impact of Exposed Facets on the BiVO₄ Material Performance for Photocatalytic Water Splitting Reactions

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TiO2-supported Pt single atoms by surface organometallic chemistry for photocatalytic hydrogen evolution

Abstract: Platinum single atoms are grafted by SOMC on morphology-controlled TiO2. Their structure is characterized by EXAFS and other techniques, and their activity and stability in HER and backwards reaction are studied and compared to Pt nanoparticles.

Cited by 37 publications

References 82 publications

Restructuring effects of the chemical environment in metal nanocatalysis and single-atom catalysis

Restructuring effects of the chemical environment in metal nanocatalysis and single-atom catalysis

Photocatalytic production of H2 is a multi-criteria optimization problem: Case study of RuS2/TiO2

Significant Impact of Exposed Facets on the BiVO4 Material Performance for Photocatalytic Water Splitting Reactions

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TiO₂-supported Pt single atoms by surface organometallic chemistry for photocatalytic hydrogen evolution

Significant Impact of Exposed Facets on the BiVO₄ Material Performance for Photocatalytic Water Splitting Reactions