Structural and electronic effects in bimetallic PdPt nanoparticles on TiO2 for improved photocatalytic oxidation of CO in the presence of humidity

Rosseler, Olivier; Ulhaq‐Bouillet, C.; Bonnefont, Antoine; Pronkin, Sergey; Savinova, Elena R.; Louvet, Alain; Keller, Valérie; Keller, Nicolas

doi:10.1016/j.apcatb.2014.12.001

Cited by 53 publications

(20 citation statements)

References 84 publications

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“…It was often observed, that bimetallic nanoparticles exhibit synergistic properties compared to their monometallic counterparts [34]. Titania modified with bimetallic nanoparticles such as PdPt [35], AgPt, AuAg [36], AuCu [29], [36], AuPd [32], AgCu [30] NiAu [37] displayed higher catalytic and photocatalytic activity in the comparison with the samples decorated with only one metal.…”

Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic, electrochemical and photoelectrochemical properties of TiO2 nanotubes arrays modified with Cu, AgCu and Bi nanoparticles obtained via radiolytic reduction

Nischk¹,

Mazierski

Wei

et al. 2016

Applied Surface Science

111

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Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic, electrochemical and photoelectrochemical properties of TiO2 nanotubes arrays modified with Cu, AgCu and Bi nanoparticles obtained via radiolytic reduction

Nischk¹,

Mazierski

Wei

et al. 2016

Applied Surface Science

111

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“…[10,16] In this context, these statements agree with previous investigations. [46][47][48] The ORR and water splitting reactions encompass complex steps related to several oxygen-containing compounds, in which the interaction of the catalyst surface with O2 and/or H2O interface is expected to have a pivotal role in their catalytic activities. [49] The electronic effect as well as the introduction of oxygen vacancies at the surface of PdPt-TiO2 can modify the position of d-bands of the catalyst, favoring the interaction between the catalyst surface and the O2 and H2O…”

Section: Resultsmentioning

confidence: 99%

“…molecules. [28,48] The oxygen binding for surfaces displaying an optimized control over the electronic effect and oxygen vacancies should promote moderate interactions (Sabatier's principle) between PdPt-TiO2 and O2/H2O interfaces, leading to higher catalytic activities. In this context, we believe that a question should be investigated: how could the observed electronic effects and oxygen vacancy at the TiO2 nanowire surface be correlated to the catalytic performances towards the photocatalytic water splitting and ORR?…”

Section: Resultsmentioning

confidence: 99%

PdPt-TiO2 nanowires: correlating composition, electronic effects and O-vacancies with activities towards water splitting and oxygen reduction

Silva

Fernandes

Hood

et al. 2020

Applied Catalysis B: Environmental

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We report on the optimization of both the support and the active phase in PdPt NPs supported on TiO2 nanowires to obtain highly active electro/photocatalysts towards the oxygen reduction reaction (ORR) and photocatalytic water splitting. This system displayed strong metal-support interactions, high concentration of oxygen vacancies, and ~2 nm PdPt NPs sizes. By optimizing the loading of PdPt at the TiO2 surface, both photo/electrocatalytic activities were improved compared to commercial materials. Interestingly, a volcano plot between the catalytic activity and the PdPt composition was observed, in which the Pd0.22 Pt0.78-TiO2/C sample led to the optimal performances. For instance, the amount of hydrogen produced from water splitting was 11.6 mmol/gcatalyst. For the ORR, catalytic activity similar to the commercial Pt catalyst but with a lower Eonset (0.87 VRHE vs w 0.95 VRHE) was detected. The variations in the catalytic activities with the composition correlated well with variations in the electronic effects and concentration of oxygen vacancy sites at the catalyst surfaces.

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“…Other beneficial effects can also occur. For instance, the adsorption on the metal of a reactant or an intermediate product, e.g., CO [85][86][87][88] that is poorly adsorbed on TiO 2 , can be favorable. In several cases, it has also been observed that the metal particles facilitate the de-agglomeration of the TiO 2 grains and thereby could allow, inter alia, a better contact of TiO 2 with the reactants and improved irradiation (however, see Sect.…”

Section: Effects Of Metal Depositsmentioning

confidence: 99%

Fundamentals of TiO2 Photocatalysis. Consequences for Some Environmental Applications

Pichat

2015

Green Chemistry and Sustainable Technology

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This chapter considers the fundamental phenomena occurring when TiO 2 is excited by photons. The focus is first on the formation and fate of the charges generated by the excitation. Then, the roles in photocatalytic reactions of water and oxygen which are almost always present are presented and discussed; the effects of adding ozone or hydrogen peroxide are also briefly indicated. Regarding the photocatalytic degradation of organic compounds -which is involved in potential applications such as self-cleaning materials and air or water purification -the following issues are examined: the hole-induced and hydroxyl radical-induced pathways and the predictability of the nature of the intermediate products. Some of the material aspects of photocatalysis are dealt with through (1) the influence of the structural and textural characteristics of pristine TiO 2 , (2) the effects of modifying TiO 2 by metal deposits or ion doping, and (3) the basic outcomes of combining TiO 2 with either another oxide (insulating or semiconducting) or a supplementary adsorbent of high surface area. Conclusions are drawn from these fundamental topics about the applicability of TiO 2 photocatalysis.

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Structural and electronic effects in bimetallic PdPt nanoparticles on TiO2 for improved photocatalytic oxidation of CO in the presence of humidity

Cited by 53 publications

References 84 publications

Enhanced photocatalytic, electrochemical and photoelectrochemical properties of TiO2 nanotubes arrays modified with Cu, AgCu and Bi nanoparticles obtained via radiolytic reduction

Enhanced photocatalytic, electrochemical and photoelectrochemical properties of TiO2 nanotubes arrays modified with Cu, AgCu and Bi nanoparticles obtained via radiolytic reduction

PdPt-TiO2 nanowires: correlating composition, electronic effects and O-vacancies with activities towards water splitting and oxygen reduction

Fundamentals of TiO2 Photocatalysis. Consequences for Some Environmental Applications

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