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Robust hybrid bismuth perovskites as potential photocatalysts for overall water splitting

Nano Research 2024年第5期17卷 4593-4601页

作者： Antonio J.Chacón-garcía Herme G.Baldovi Artem A.Babaryk Antonio Rodríguez-Diéguez Sergio Navalón Yolanda Pérez hermenegildo garcía Patricia Horcajada Advanced Porous Materials Unit IMDEA Energy InstituteAvda.Ramón y Cajal 328935 MóstolesMadridSpain Departamento de Química Universitat Politècnica de València46022 ValènciaSpain Departamento Química Inorgánica Universidad de Granada1807GranadaSpain Departamento de Biología y Geología Física y Química Inorgánica.ESCET.Universidad Rey Juan Carlos28933 MóstolesMadridSpain Instituto de tecnología química CSIC-UPV Universitat Politècnica de València(UPV)46022Spain

Organic-inorganic hybrid perovskites have gained great attention as promising photocatalysts for hydrogen ***,due to their poor stability in water,the use of aqueous hydrohalic acid solutions is specifically required for an efficient hydrogen ***,three novel photoactive lead-free hybrid perovskites based on bismuth and triazolium cations(denoted as IEF-15,IEF-16,and IEF-17(IEF stands for IMDEA energy frameworks))were synthesized and fully characterized(structural,compositional,optical,etc.).Further,these solids were proposed as photocatalysts for the challenging gas phase overall water splitting(OWS)***,IEF-16 thin films exhibited a remarkable photocatalytic activity in both H_(2) and O_(2) evolution,as a consequence of its appropriate bandgap and energy-band alignment,achieving hydrogen evolution rates ofμmol·g_(H_(2))^(-)1846 and 360 after 24 h under ultraviolet-visible(UV-vis)irradiation or simulated solar irradiation,*** study additionally highlights the remarkable structural and photochemical stability of IEF-16 under different operational conditions(*** volume,irradiation and temperature),paving the way for green hydrogen production from OWS using perovskite-based photocatalysts.

关键词： bismuth-based hybrid perovskites thin films photocatalysis overall water splitting green hydrogen

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Metal-organic framework-based materials as key components in electrocatalytic oxidation and reduction reactions

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Journal of Energy Chemistry 2023年第12期87卷 540-567,I0014页

作者： Soheila Sanati Ali Morsali hermenegildo garcía Department of Chemistry Faculty of Basic SciencesTarbiat Modares UniversityTehran 14115175Iran Instituto Universitario de Tecnología Química Universidad Politecnica de ValenciaConsejo Superior de Investigaciones CientíficaSUniversitat Politècnica de ValènciaValència 46022Spain

Studies have extensively addressed the development of electrocatalytic technologies for energy storage and conversion,fuel production,and environmental *** processes such as different oxidation and reduction reactions play a vital and significant role in these *** this regard,efficient,inexpensive,and stable electrocatalysts capable can significantly promote electrochemical *** features of metal–organic frameworks(MOFs)such as their high porosity,tunable structure,size,and pore shape,high surface area,and redox properties have introduced them as an ideal electrocatalyst *** review is thus aimed at elucidating the role of MOF-based materials(pristine,derivatives and composites)as efficient electrocatalysts in energy and sensing-related oxidation and reduction reactions such as oxygen reduction reaction(ORR),hydrogen oxidation reaction(HOR),carbon dioxide reduction reaction(CO_(2)RR),urea oxidation reaction(UOR),alcohol oxidation reaction(AOR),nitrogen reduction reaction(NRR),and glucose oxidation reaction(GOR)in advanced energy and sensing ***,the structure–property relationship of the electrocatalyst was elaborated for each electrocatalytic ***,perspectives on the potential research topics for practical use of MOF-based electrocatalysts are *** present review can improve the interest in MOF-based electrocatalysts to study different oxidation and reduction reactions in energy and sensing systems.

关键词： Metal-organic frameworks Electrocatalyst Oxidation reaction Reduction reaction

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Structure–activity relationship in Ti phosphate-derived photocatalysts for H2 evolution

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Journal of Energy Chemistry 2017年第2期26卷 295-301页

作者： Diego Mateo Francisco Gonell Josep Albero Avelino Corma hermenegildo garcía Instituto de Tecnología Química Universitat Politècnica de València-Consejo superior de Investigaciones CientíficasAvenido de los Naranjos s/n46022 ValenciaSpain

Photocatalytic Hproduction has emerged as one of the most clean and promising renewable energy sources. In spite of the efforts to obtain efficient photocatalysts able to produce Hfrom Sun light and water, there is still the need to prepare cheaper and environmental friendlier photocatalysts. Phosphatebased materials could be good candidates to fulfill these requirements. In this manuscript we have prepared a set of mixed Ti/Tivalence, open-framework titanium phosphates（of-TiPO） and mixed titanium oxide/phosphate derivatives（cr-Ti P）, correlating their structure and composition with the photocatalytic activity for Hproduction. We determined that mixed titanium oxide/phosphate crystalline phases produced enhanced Hevolution under Sun simulated light irradiation than mixed Ti/Tivalence, open-framework titanium phosphates and titanium oxide phases.

关键词： Photocatalysis Hydrogen generation Semiconductor

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Nickel phosphonate MOF as efficient water splitting photocatalyst

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Nano Research 2021年第2期14卷 450-457页

作者： Pablo Salcedo-Abraira Sergio M.F.Vilela Artem A.Babaryk Maria Cabrero-Antonino Pedro Gregorio Fabrice Salles Sergio Navalon hermenegildo garcia Patricia Horcajada IMDEA Energy Advanced Porous Materials Unit(APMU)Avda.Ramon de Ia Sagra 3E 28935 MostolesMadridSpain Deparrtamento de Quimica Inorginica I.Fac.CC.Quimicas Universidad Complutense de MadridAvda.Complutense s/n28040 MadridSpain Departamento de Quimica and Instituto de Tecnologia Quimica(CSIC-UPV) Universitat Politecnica de ValenciaC/Camino de Veras/n46022 ValenciaSpain Institut Charles Gerhardt Montpellier UMR 5253 CNRS UM ENSCMUniversite MontpellierPlace E.Bataillon34095 Montpellier Cedex 05France

A novel microporous two-dimensional(2D)Ni-based phosphonate metal-organic framework(MOF;denoted as IEF-13)has been successfully synthesized by a simple and green hydrothermal method and fully characterized using a combination of experimental and computational *** resolution by single-crystal X-ray diffraction reveals that IEF-13 crystallizes in the triclinic space group Pi having bi-octahedra nickel nodes and a photo/electroactive tritopic phosphonate ***,this material exhibits coordinatively unsaturated nickel(II)sites,free-P0_(3)H_(2)and-P0_(3)H acidic groups,a C0_(2)accessible microporosity,and an exceptional thermal and chemical ***,its in-deep optoelectronic characterization evidences a photoresponse suitable for *** this sense,the photocatalytic activity for challenging H_(2)generation and overall water splitting in absence of any co-catalyst using UV-Vis irradiation and simulated sunlight has been evaluated,constituting the first report for a phosphonate-MOF ***-13 is able to produce up to 2,200 fimol of H_(2)per gram using methanol as sacrificial agent,exhibiting stability,maintaining its crystal structure and allowing its *** more,170μmol of H_(2)per gram were produced using IEF-13 as photocatalyst in the absence of any co-catalyst for the overall water splitting,being this reaction limited by the 0_(2)*** present work opens new avenues for further optimization of the photocatalytic activity in this type of multifunctional materials.

关键词： metal-organic framework phosphonates photocatalysis water splitting

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Molybdenum carbide as catalyst in biomass derivatives conversion

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Journal of Energy Chemistry 2022年第10期31卷 68-87,I0003页

作者： Xiangze Du Rui Zhang Dan Li Changwei Hu hermenegildo garcia Key Laboratory of Green Chemistry and Technology Ministry of EducationCollege of ChemistrySichuan UniversityChengdu 610064SichuanChina Instituto Universitario de Tecnología Química Consejo Superior de Investigaciones Científicas.-Universitat Politecnica de ValenciaUniversitat Politecnica de ValenciaAv.De los Naranjos s/nValencia 46022Spain Department of Chemistry University of HelsinkiA.I.Virtasen Aukio 1P.O.Box 5500014Finland

The present energy dilemma in conjunction with the adverse environmental impacts caused by fossil fuel combustion motivates researchers to seek for new renewable energy with minimal CO_(2)*** a practice pathway,it is of significance to produce biofuel and platform chemicals from sustainable biomass ***,the research and development of high-efficiency catalysts remain one key scientific *** the catalysts developed,transition metal carbides,especially molybdenum carbide,show promising performances on biomass-based *** efforts have been made in past few decades on tuning the structure and electronic property of molybdenum carbide via controlling particle size and morphology,metal and nonmetal doping and vacancies,*** review summarizes recent developments of molybdenum carbide as catalysts in converting biomass into fuel,mainly focused on the preparation methods,the structure-dependent effects and the electronic *** controllable selective cleavage of C-C,C-O and C-H bonds over modified molybdenum carbides that has been demonstrated in the conversion of biomass feedstocks is then *** addition,the possible deactivation mechanisms of molybdenum carbide are also presented in the *** review provides systematic and fundamental information for the further design and development of molybdenum carbide for the conversion of biomass resources.

关键词： Molybdenum carbide Synthesis Modification Hydrogenation Biomass Selective cleavage

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Effect of high anodic polarization on the passive layer properties of superduplex stainless steel friction stir welds at different chloride electrolyte pH values and temperatures

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International Journal of Minerals,Metallurgy and Materials 2019年第6期26卷 710-721页

作者： L.A.Santa-Cruz G.Machado A.A.Vicente T.F.C.hermenegildo T.F.A.Santos Department of Mechanical Engineering Universidade Federal de PernambucoAv.da Arquiteturas/n50740-550RecifePEBrazil Center of Nanotechnology Centro de Tecnologias Estratégicas do NordesteCETENERecifePEBrazil Department of Chemical Engineering Universidade de Sao PauloSao PauloSPBrazil

The conditions used for friction stir welding of duplex stainless steels determine the resulting mechanical and corrosion performance of the *** study investigates the corrosion resistance of UNS S32750 and S32760 superduplex stainless steels(SDSSs)joined by friction stir welding,employing cyclic polarization,Mott–Schottky,and microscopy techniques for *** microscopy images indicated the presence of a deleterious intermetallic phase after electrolytic etching of S32760,as well as decreased corrosion *** presence of molybdenum in the steels promoted better passive behavior at low *** Mott–Schottky curves revealed p-n heterojunction behavior of the passive *** acquired after the polarization test by scanning electron microscopy showed higher passivation propensity with increases of temperature and pH.

关键词： superduplex stainless steel friction stir welding corrosion resistance cyclic polarization Mott–Schottky

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Availability, Prices and Affordability of Glaucoma Medicines among Private Pharmacies of Nampula City in Mozambique

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Open Journal of Epidemiology 2022年第2期12卷 158-169页

作者： Joel Bambamba Neivaldo Murrube Paulo Pires Ângela Bambamba Christpina Anale Avelino Mazuze João Mazalo Momade Fumo Ramos Manuel hermenegildo Tomo Department of Optometry Faculty of Health Sciences Lúrio University Nampula Mozambique Department of Pharmacy Faculty of Health Sciences Lúrio University Nampula Mozambique Department of Family Medicine Faculty of Health Sciences Lúrio University Nampula Mozambique

Introduction: Glaucoma is a group of chronically progressive disorders of the optic nerve and a worldwide leading cause of irreversible vision loss. Eye chronic diseases including glaucoma are major public health problems around the world, rapidly increasing with a growing and aging population. The treatment of chronic diseases lasts a lifetime. The purpose of this study is to assess the availability, prices and affordability of the medicines for glaucoma management in private pharmacies of Nampula City in Mozambique. Material and Methods: The standardized methodology designed by the World Health Organization and Health Action International was employed to conduct the study about the availability, price and affordability of glaucoma medicines in Nampula City from October to November 2021. Data were collected in 39 private pharmacies using a survey with fifteen glaucoma Medicines. Results: The Average of medicines availability was 46.6% (0.0% - 71.8%) with a mean of 8.86. The availability level demonstrated that 14 (93.3%) of all surveyed glaucoma medicines were very low and 1 (6.67%) was fairly high. Timolol was the most available medicine, found in 28 (71.8%) while apraclonidine, carteolol, levobunolol, carbachol, brinzolamide, bimatoprost, travoprost and unoprostone were not available. The medicine with the lowest price was latanoprost (2.84 USD) and the higher was acetazolamide (23.58 USD). None of the surveyed medicines were considered affordable. Conclusion: The majority of surveyed glaucoma medicines were not available and they were totally unaffordable against the defined thresholds. Policy strategy and technical options should be driven and implemented by the government to ensure the availability and affordability of glaucoma medicines at various levels of the Mozambican healthcare system.

关键词： Availability Prices Affordability Medicines Glaucoma

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