Tomasz Baran

Tomasz Baran
SajTom Light Future

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About

36
Publications
10,004
Reads
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818
Citations
Additional affiliations
January 2015 - March 2016
Jagiellonian University
Position
  • Researcher
January 2015 - March 2016
University of Milan
Position
  • Researcher
September 2011 - present
Jagiellonian University
Position
  • PhD Student

Publications

Publications (36)
Article
Full-text available
This work aims at reviewing the most impactful results obtained on the development of Cu-based photocathodes. The need of a sustainable exploitation of renewable energy sources and the parallel request of reducing pollutant emissions in airborne streams and in waters call for new technologies based on the use of efficient, abundant, low-toxicity an...
Article
Cocatalysts play an important role in photocatalysis towards achieving enhanced efficiency and stability. The coupling of metal cocatalysts with semiconductor photocatalysts is the most proficient path to facilitate the separation of photoexcited electron-hole pairs and to suppress their recombination. Herein, a strategy for the preparation of copp...
Article
Volatile organic compounds constitute a group of dangerous air pollutants, which can be eliminated by the photocatalytic route. In this work we demonstrated the hydrothermal synthesis of photocatalytic composite CTO-RGO based on copper titanate and reduced graphene oxide. The material is composed of three phases namely rutile, tenorite and reduced...
Preprint
Full-text available
Conduction band potential is one of the most crucial physicochemical properties of semiconductor towards photocatalytic and photoelectrochemical aplications. Inexpensive home-made Arduino devices is proposed for determination of flat band potential, based on the well-established method: open-circuit photovoltage measurements. To verify proposed mea...
Article
Full-text available
Based on a facile three‐step preparation method, CuO/g‐C3N4 photocatalysts have been successfully synthesized by exfoliation of a bulk graphitic carbon nitride and subsequent hydrothermal decoration with CuO nanoparticles. Several advanced scientific tools were used to characterize crucial features of the prepared materials, in particular, to under...
Article
Full-text available
Photocatalytic use of the neat graphitic carbon nitride, g-C3N4, is usually restricted by unsatisfactory efficiency due to low solar light absorption and rapid recombination of photogenerated charge carriers. The introduction of metal ions into g-C3N4 structure can effectively reduce the recombination rate of photogenerated charges, expand the ligh...
Article
Photoelectrochemical water splitting (PEC‐WS) is a promising route to obtain hydrogen (and oxygen) from sunlight and water. However, too many semiconductors show poor stability, due to photodegradation phenomena in aqueous solutions, thus loosing efficiency under operative conditions. Aim of this paper is to introduce a simple and fast method for s...
Article
A low specific surface area and high rate of electron-hole pairs recombination restrict photocatalytic use of graphitic carbon nitride (g-C3N4). In this context, we demonstrated that doping of g-C3N4 may overcome these obstacles. Graphitic carbon nitride doped with iron, manganese, antimony, and bismuth demonstrated the reduced band gap energy, enl...
Article
A novel photocathodic composite has been studied towards photoelectrochemical (PEC) hydrogen production from water. Copper oxide/indium oxide (CuO/In2O3) thin film photocathodes have been prepared by electrochemical method under various potentials, followed by the thermal treatment. Photocathodes were characterized using X-ray powder diffraction (X...
Article
Full-text available
Cu2O is one of the most studied semiconductors for photocathodes in photoelectrochemical water splitting (PEC-WS). Its low stability is counterbalanced by good activity, provided that a suitable underlayer/support is used. While Cu2O is mostly studied on Au underlayers, this paper proposes Cu(0) as a low-cost, easy to prepare and highly efficient a...
Article
The nanoflowers copper-zinc oxide (CZO) heterostructure has been prepared using the hydrothermal method. As it exhibits a low band gap energy the material may absorb large amounts of natural sunlight. Under visible light irradiation, CZO showed signs of activity towards hydrogen production in the two conditions, which are: i) the condition of photo...
Article
Full-text available
3D printing has been gaining popularity in the past few years for both personal and professional uses. However, recent results showed that desktop 3D printers emit particles and compounds, which have negative health effects. In this study, the emission from commercially available 3D printing polymers was evaluated. Volatile organic compounds (VOC)...
Article
Photocatalytic hydrogen production is a promising approach of sustainable economy, because a use of sunlight and water to produce a fuel will solve a problem of fossil fuels depletion. Metal sulfides are well known photocatalysts in water splitting process, but in absence of sacrificial electron donor they undergo a photocorrosion. In this paper we...
Article
In this paper we propose titanium dioxide modified with cobalt(II) 2-ethylhexanoate ([email protected]2) as photoactive material for the efficient visible light driven production of H2O2. We demonstrate that visible light activity can be achieved thanks to a photoinduced electron transfer from the excited complex towards the TiO2 conduction band th...
Article
Nanocrystalline, wurtzite structure ZnS and iron-doped ZnS were synthesized by a hydrothermal method. The visible light (λ > 500 nm) driven photocatalytic activity of doped zinc sulfide was evaluated by the reduction of hexavalent chromium in water. ZnS-based materials exhibit high photocatalytic activity towards reduction of Cr(VI) due to its low...
Article
Full-text available
Photoelectrochemical (PEC) water splitting is promising approach of solar energy conversion. Graphitic carbon nitride can be given as an example of metal-free and cheap semiconducting material for photoelectrochemical reactions however its activity is very low, probably due to high rate of unfavorable charge carriers recombination. Type II heterost...
Article
Here we report the synthesis of a core - CuI/shell - CuO nanostructure that depending on the applied potential works as photocathode or photoanode in neutral pH upon visible light irradiation. Under cathodic polarization, this material generates a stable cathodic photocurrent but functions as photoanode when anodic polarization is applied. In this...
Article
The development of efficient, sustainable, cheap and safe methods for the synthesis of hydrogen peroxide is a very important challenge from the environmental viewpoint, since H2O2 can be used as a solar fuel or for degradation of organic, inorganic and biologic pollutants from wastewater. Efficient photocatalytic or photoelectrochemical formation o...
Article
Bare and photosensitized copper iodide were tested in photocatalysed degradation of an organic dye (Acid Red 1) and inactivation of fungi (Saccharomyces cerevisiae). CuI, with the band gap energy slightly lower than that of TiO2, appeared highly efficient in these processes. Sensitization of copper iodide was achieved by surface modification with [...
Article
Full-text available
Materials obtained by immobilization of nickel and iron complexes on the surface of n-type titanium dioxide and p-type copper iodide have interesting photoelectrochemical properties. Fe(NA)Cl2@TiO2, Fe(NA)Cl2@CuI, Ni-rutin@CuI and Ni-rutin@TiO2 exhibit pronounced photosensitization towards visible light and photoelectrodes prepared from these mater...
Article
Full-text available
The fast development of low-cost desktop three-dimensional (3D) printers has made those devices widely accessible for goods manufacturing at home. However, is it safe? Users may belittle the effects or influences of pollutants (organic compounds and ultrafine particles) generated by the devices in question. Within the scope of this study, the autho...
Article
The Inside cover picture shows the concept of using p-type semiconductors as photocatalysts for carbon dioxide conversion into chemicals and fuels. Although p- and n-type semiconductors are mainly considered as basic components used in electronics, the distinction between these two types of semiconductors may also be crucial for photocatalysis. The...
Article
Light driven water splitting is one of the most promising approaches for using solar energy in view of a more sustainable development. In this paper, a highly efficient p-type copper(II) oxide photocathode is studied. The material, prepared by thermal treatment of CuI nanoparticles, is initially partially reduced upon working conditions and soon re...
Article
A p-type semiconductor, CuI, has been synthesized, characterized, and tested as a photocatalyst for CO2 reduction under UV/Vis irradiation in presence of isopropanol as a hole scavenger. Formation of CO, CH4 , and/or HCOOH was observed. The photocatalytic activity of CuI was attributed to the very low potential of the conduction band edge (i.e., -2...
Article
Industrial utilization of CO2 is an important research area not only due to the potential contribution to the reduction of emissions into atmosphere, but also for saving carbon resources through the recycle of carbon. The use of solar energy in the conversion of CO2 appears to be a major challenge and opportunity for the future. A group of nanocrys...
Article
Full-text available
Despite the development of advanced technology (or because of its development) environmental pollution, including particularly dangerousair pollutions, are really serious today. Photocatalytic air treatment has the potential for degradation of both, organic and inorganiccontaminants including particularly dangerous nitrogen oxides and volatile orga...
Article
Full-text available
The utilization of solar energy may represent a real breakthrough in the conversion of CO2 to afford different products, from functionalised organic substrates to C1 and Cn energy rich molecules. In this paper we describe the photocatalytic incorporation of CO2 into 2,3-dihydrofuran (2,3-DHF). Ru-decorated ZnS was used as photocatalyst, that has be...
Article
Full-text available
A hybrid enzymatic/photocatalytic approach for the conversion of CO2 into methanol is described. For the approach discussed here, the production of one mol of CH3OH from CO2 requires three enzymes and the consumption of three mol of NADH. Regeneration of the cofactor NADH from NAD(+) was achieved by using visible-light-active, heterogeneous, TiO2-b...
Article
Photocatalytic carboxylation of acetylacetone with carbon dioxide has been performed by using ZnS-based photocatalysts. The formation of two isomeric carboxylic acids, as proven by IR and 13C NMR spectroscopy, was observed. The reaction yield was enhanced after deposition of ruthenium nanoparticles on ZnS. The reaction encompasses ruthenium-mediate...
Article
A photoinduced electron injection from the excited photosensitizer to the conduction band is usually a key step of photosensitization of wide bandgap semiconductors. The significance of this process has been recognized especially in the case of titanium dioxide, when applied as a visible light active photocatalyst or as an anode material in dye-sen...
Article
Full-text available
A series of materials based on titanium dioxide modified with platinum(IV), chromium(VI) and chromium(III) compounds were prepared. Their photocatalytic activity upon visible light irradiation was tested in the processes of gas-phase oxidation of volatile organic compounds, like acetone and methanol. These experiments confirmed an effective photose...
Article
A series of materials based on titanium dioxide modified with platinum(IV), chromium(VI) and chromium(III) compounds were prepared. Their photocatalytic activity upon visible light irradiation was tested in the processes of gas-phase oxidation of volatile organic compounds, like acetone and methanol. These experiments confirmed an effective photose...
Article
Rocking chair enzyme: Chemical reducing agents (sodium dithionite) or bioglycerol (as H and e−-donor under irradiation in the presence of ZnS-A as photocatalyst) are able to back-convert NADP+ into NADPH, which is used as e−-donor in the enzymatic reduction of CO2 into CH3OH. In doing so, the molar ratio CH3OH/CO2 has been increased (without recycl...

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