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Electrocatalytic conversion of CO_2 to liquid fuels using nanocarbon-based electrodes

Journal of Energy Chemistry 2013年第2期22卷 202-213页

作者： chiara genovese Claudio Ampelli Siglinda Perathoner Gabriele Centi Dipartimento di Ingegneria Elettronica Chimica e Ingegneria Industriale and INSTM/CASPE University of Messina V. le F. Stagno d'Alcontres 31-98166 Messina Italy

Recent advances on the use of nanocarbon-based electrodes for the electrocatalytic conversion of gaseous streams of CO2 to liquid fuels are discussed in this perspective paper. A novel gas-phase electrocatalytic cell, different from the typical electrochemical systems working in liquid phase, was developed. There are several advantages to work in gas phase, e.g. no need to recover the products from a liquid phase and no problems of CO2 solubility, etc. Operating under these conditions and using electrodes based on metal nanoparticles supported over carbon nanotube （CNT） type materials, long C-chain products （in particular isopropanol under optimized conditions, but also hydrocarbons up to C8-C9） were obtained from the reduction of CO2. Pt-CNT are more stable and give in some cases a higher productivity, but Fe-CNT, particular using N-doped carbon nanotubes, give excellent properties and are preferable to noble-metal-based electrocatalysts for the lower cost. The control of the localization of metal particles at the inner or outer surface of CNT is an importact factor for the product distribution. The nature of the nanocarbon substrate also plays a relevant role in enhancing the productivity and tuning the selectivity towards long C-chain products. The electrodes for the electrocatalytic conversion of CO2 are part of a photoelectrocatalytic （PEC） solar cell concept, aimed to develop knowledge for the new generation artificial leaf-type solar cells which can use sunlight and water to convert CO2 to fuels and chemicals. The CO2 reduction to liquid fuels by solar energy is a good attempt to introduce renewables into the existing energy and chemical infrastructures, having a higher energy density and easier transport/storage than other competing solutions （i.e. H2）.

关键词： CO2 conversion solar fuels CNT Fe nanoparticles nanocarbon H2 production

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Analysis of the factors controlling performances of Au-modified TiO2 nanotube array based photoanode in photo-electrocatalytic(PECa)cells

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Journal of Energy Chemistry 2017年第2期26卷 284-294页

作者： Claudio Ampelli Francesco Tavella chiara genovese Siglinda Perathoner Marco Favaro Gabriele Centi Department of Chemical BiologicalPharmaceutical and Environmental SciencesUniversity of MessinaERIC aisbl and CASPE/INSTMV.le F.Stagno d’Alcontres 3198166 MessinaItaly Department of Chemical Sciences University of Paduavia Marzolo 135136 PaduaItaly Department of Mathematical ComputerPhysical and Earth SciencesUniversity of MessinaERIC aisbl and CASPE/INSTMV.le F.Stagno d’Alcontres 3198166 MessinaItaly Advanced Light Source Joint Center for Artificial PhotosynthesisLawrence Berkeley National Laboratory1 Cyclotron Rd.M/S 30R0205 BerkeleyCA 94720USA.

The efficiency of photo-electrocatalytic（PECa） devices for the production of solar fuels depends on several limiting factors such as light harvesting, charge recombination and mass transport diffusion. We analyse here how they influence the performances in PECa cells having a photo-anode based on Au-modified TiOnanotube（TNT） arrays, with the aim of developing design criteria to optimize the photo-anode and the PECa cell configuration for water photo-electrolysis（splitting） and ethanol photo-reforming *** TNT samples were prepared by controlled anodic oxidation of Ti foils and then decorated with gold nanoparticles using different techniques to enhance the visible light response through heterojunction and plasmonic effects. The activity tests were made in a gas-phase reactor, as well as in a PECa cell without applied bias. Results were analysed in terms of photo-generated current, Hproduction rate and photoconversion efficiency. Particularly, a solar-to-hydrogen efficiency of 0.83% and a Faradaic efficiency of 91%were obtained without adding sacrificial reagents.

关键词： H2 production Au nanoparticles Solar fuels TiO2 nanotubes Electrodeposition Photoelectrochemical cells(PEC) Solar-to-hydrogen efficiency Anodic oxidation

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Emission or scattering?Discriminating the origin of responsiveness in AIEgen-doped smart polymers using the TPE dye

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Aggregate 2023年第6期4卷 85-94页

作者： Valentina A.Dini Damiano genovese Cosimo Micheletti Nelsi Zaccheroni Andrea Pucci chiara Gualandi Department of Chemistry“Giacomo Ciamician” University of BolognaBolognaItaly INSTM UdR of Bologna University of BolognaBolognaItaly Department of Chemistry and Industrial Chemistry University of PisaPisaItaly INSTM UdR of Pisa University of PisaPisaItaly Health Sciences and Technologies(HST)CIRI University of BolognaOzano Emilia BolognaItaly Advanced Applications in Mechanical Engineering and Materials Technology CIRI University of BolognaBolognaItaly

Aggregation-induced emission(AIE)luminogens are attractive dyes to probe poly-mer properties that depend on changes in chain mobility and free *** embedded in polymers the restriction of intramolecular motion(RIM)can lead to their photoluminescence quantum yield(PLQY)strong enhancement if local microviscosity increases(lowering of chain mobility and free volume).Nonethe-less,measuring PLQY during stimuli,*** or mechanical stress,is technically challenging;thus,emission intensity is commonly used instead,assuming its direct correlation with the ***,by usingﬂuorescence lifetime as an absoluteﬂuorescence parameter,it is demonstrated that this assumption can be invalid in many commonly encountered *** this aim,different poly-mers are loaded with tetraphenylenethylene(TPE)and characterized during the application of thermal and mechanical stress and physical *** these con-ditions,polymer matrix transparency variation is observed,possibly due to local changes in refractive index and to the formation of *** combin-ing different characterization techniques,it is proved that scattering can affect the apparent emission intensity,while lifetime measurements can be used to ascertain whether the observed phenomenon is due to modiﬁcations of the photophysi-cal properties of AIE dyes(RIM effect)or to alterations in the matrix optical properties.

关键词： AIE luminogens glass transition mechanochromism physical aging scattering smart polymer

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