Passing the limit of electrodeposition: ‘Gas template’ H2 nanobubbles for growing highly crystalline nanoporous ZnO

Elias, Jamil; Parlinska-Wojtan, Magdalena; Erni, Rolf; Niederberger, Christoph; Sauvage, Frédéric; Thevenin, Maxime; Michler, Johann; Philippe, Laëtitia

doi:10.1016/j.nanoen.2012.06.001

Cited by 14 publications

(9 citation statements)

References 45 publications

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“…This can be seen also on the electrode surface with the development of hydrogen bubbles forming close to the cathodic to anodic vertex potential. Such a heterogeneous competition between hydrogen formation and nitrate reduction is particularly fascinating as it provides a very new way, without any means of template, to control dense-to-porous and meso-to-macroporosity depending on the potentiostatic conditions, as carefully demonstrated previously on ZnO 35 .…”

Section: Resultsmentioning

confidence: 85%

“…At pH greater than 2, a white precipitate is progressively forming into the chemical bath owing to hydrolysis of Ti 4+ . In opposite, films electrodeposited at pH below 1.2 becomes fragile and crumbly owing to an excessive porosity, likely generated by the promoted hydrogen evolution on the surface of the electrode 35 . This very close relationship between film’s morphology and chemical bath pH also gets retranscribed in the cyclic voltamperograms where more current is systematically observed when the pH is acidified ( Fig.…”

Section: Resultsmentioning

confidence: 99%

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Low-temperature electrodeposition approach leading to robust mesoscopic anatase TiO2 films

Patra

Andriamiadamanana

Tułodziecki

et al. 2016

Sci Rep

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Anatase TiO2, a wide bandgap semiconductor, likely the most worldwide studied inorganic material for many practical applications, offers unequal characteristics for applications in photocatalysis and sun energy conversion. However, the lack of controllable, cost-effective methods for scalable fabrication of homogeneous thin films of anatase TiO2 at low temperatures (ie. < 100 °C) renders up-to-date deposition processes unsuited to flexible plastic supports or to smart textile fibres, thus limiting these wearable and easy-to-integrate emerging technologies. Here, we present a very versatile template-free method for producing robust mesoporous films of nanocrystalline anatase TiO2 at temperatures of/or below 80 °C. The individual assembly of the mesoscopic particles forming ever-demonstrated high optical quality beads of TiO2 affords, with this simple methodology, efficient light capture and confinement into the photo-anode, which in flexible dye-sensitized solar cell technology translates into a remarkable power conversion efficiency of 7.2% under A.M.1.5G conditions.

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Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Low-temperature electrodeposition approach leading to robust mesoscopic anatase TiO2 films

Patra

Andriamiadamanana

Tułodziecki

et al. 2016

Sci Rep

Self Cite

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“…This effect does not hinder, however, the growth of the whole nanocrystal. Thus, the present route appears to be an interesting alternative to previously reported methods based on the use of molecular dyes 39 or gas 40 to electrodeposit ZnO nanoporous lms.…”

Section: Journal Of Materials Chemistry a Papermentioning

confidence: 76%

ZnO–ionic liquid hybrid films: electrochemical synthesis and application in dye-sensitized solar cells

et al. 2013

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An innovative ionic liquid (IL)-based synthesis route was developed to obtain ZnO-based hybrid nanostructured films with a modified surface. In particular, ZnO-IL hybrid films, with thickness from 1.5 to 4.5 mm and an appealing sponge-like morphology, were obtained from the electrochemical reduction of NO 3 À in ionic liquid-based electrolytes containing Zn 2+ . The presence of the ionic liquid moieties and/ or derivatives in the as-deposited films was demonstrated by Fourier transform infra-red spectroscopy and energy dispersive X-ray spectroscopy. However, a relatively soft thermal annealing (i.e. 1 hour in air at 350 C) was proved to be an effective way to remove the ionic liquid content from the samples, leading to porous ZnO films with high specific surface area. In comparison to ionic liquid-free samples, a blue shift of $40 meV in the absorption onset is detected for the ZnO-PYR14TFSI hybrid films, which suggests a modification of the bandgap. Both kind of films (i.e. ZnO-IL and ZnO) were sensitized with an indoline dye, coded D358, and evaluated as photoanodes in Dye-sensitized Solar Cells (DSCs).Although less D358 was adsorbed onto ZnO-IL samples (suggesting co-adsorption of the IL and D358), a clear enhancement (by a factor of ca. 2) of the power conversion efficiency was detected in DSC based on ZnO-IL hybrid films. This improvement was mainly due to a huge increase ($180 mV) in the photovoltage, which reaches values of up to 780 mV. The DSC characterization, by electrochemical impedance spectroscopy and open circuit voltage decay techniques, indicates that the photovoltage improvement is likely due to a negative displacement of the conduction band in hybrid films. Therefore, the use of metal oxide-IL hybrid anodes appears to be a promising strategy to increase the open circuit voltage of the DSCs.

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“…In recent years research is more focused on CdS, CdSe, CdTe and ZnS quantum dots [174][175][176][177] due to their unique nature. More attention has been paid to their electronic arrangement phase.…”

Section: Semiconductor Quantum Dotsmentioning

confidence: 99%

Preparation and catalytic applications of nanomaterials: a review

et al. 2015

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Catalyst plays a very important role in the chemical industries. Catalysts have been used in processes like the workup of fuels such as oil, gas and coal, purification of effluents and industrial waste gases etc. Heterogeneous catalysts are gaining much attention as compared to the homogeneous catalysts as it confers more selectivity and provides better yield. Research in new catalytic materials or optimization of existing catalyst systems is of enormous importance in order to increase the efficiency of the catalyst resulting in higher product yields and purities.Currently, the research is more focused towards the nanostructured catalyst with enhanced physiochemical properties. Nanoscale catalysts have high specific surface area and surface energy, which ultimately lead to the high catalytic activity. Nano-catalyst improves the selectivity of the reactions by allowing reaction at a lower temperature, reducing occurrence of side reactions, higher recycling rates and recovery of energy consumption. Therefore, these are widely used in green chemistry, environmental remediation, efficient conversion of biomass, renewable energy development and other areas of interest. In this review prospects, paradox and perspective of preparation and catalytic application of nanomaterials in organic synthetic chemistry is reviewed, and an outlook of their developments is discussed.Zeolites sparked a revolution in the field of catalysis due to the special structure and performance. However, processing problem has been encountered with the zeolites such as the catalytic cracking of heavy oil macromolecules and immobilization of the macrocyclic complexes. Scientists had discovered mesoporous materials at early 18 th century. Since, that time mesoporous materials had become attraction for the material, chemical, physical and other disciplines. Mesoporous Silica Nanocatalyst is having the wide catalytic applications (Table 1).As, nanostructured mesoporous materials have large surface area, high activity and a great adsorption capacity 31-34 ( Figure.4). Figure 4. Variation in the pore size and particle size of the Mesoporous silica Nanocatalys. Due to an increasing interest and acceptance in the field of formation and applicability of MNB's, many new areas have been introduced with the advantages being provided by them. Theoretically, it is calculated that due to high pressure, and size in nanobubbles, the air should escape out of the bubble in microseconds. But, practically another aspect was noticed of the MNB's, i.e. under the appropriate circumstances, these MNB's can shape freely and remain stable for a comprehensive period of time. Hence, such property can be used for various different fields, like-The MNBs can be used for bioremediation purposes. Due to the large surface area of MNB, and high stagnation time in the water, sparging with MNB proves to be a better option of increasing the content of oxygen, than sparging with the macrobubbles. Hence, the water purification can be achieved with the help of MNB technology 164-166 . Mo...

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Passing the limit of electrodeposition: ‘Gas template’ H2 nanobubbles for growing highly crystalline nanoporous ZnO

Cited by 14 publications

References 45 publications

Low-temperature electrodeposition approach leading to robust mesoscopic anatase TiO2 films

Low-temperature electrodeposition approach leading to robust mesoscopic anatase TiO2 films

ZnO–ionic liquid hybrid films: electrochemical synthesis and application in dye-sensitized solar cells

Preparation and catalytic applications of nanomaterials: a review

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