Article
Chemistry, Physical
Donglin Han, Xin Liu, Tor Svendsen Bjorheim, Tetsuya Uda
Summary: Increasing Ce content in Y-doped BaZrO3, BaCeO3, and their solid solutions stabilizes protons, increases oxide ion conductivity, and decreases hole conduction, thereby enhancing the ionic conduction of BZCY20 for improved performance in fuel cells and electrolysis cells.
ADVANCED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Francisco J. A. Loureiro, Devaraj Ramasamy, Sergey M. Mikhalev, Aliaksandr L. Shaula, Daniel A. Macedo, Duncan P. Fagg
Summary: Protonic ceramic fuel cells show promise for energy conversion at intermediate temperatures. High order nickelates could be attractive cathode materials due to their high electrical conductivities. Composite cathodes in this study show improved performance, especially in wet O-2 conditions, with the correction of potential measurement biases.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Materials Science, Ceramics
Meilong Chen, Mingyang Zhou, Zhijun Liu, Jiang Liu
Summary: This paper compares the performance of two proton-conducting ceramic fuel cell electrolyte materials, BZY and BZCY. The results show that while BZCY has higher conductivity, BZY exhibits greater stability in a CO2-containing environment.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
L. Spiridigliozzi, G. Accardo, E. Audasso, S. P. Yoon, G. Dell'Agli
Summary: Orthorhombic perovskite materials BaCe0.85Gd0.15O3-& delta; (BCGO) doped with variable amounts of CuO (0-5 mol%) were synthesized and exhibited high total ionic conductivities. Various characterization techniques were used to analyze the samples, including X-ray Diffraction (XRD), Rietveld refinement, Scanning Electron Microscopy (SEM), Raman spectroscopy, and Electrochemical Impedance Spectroscopy analysis (EIS). The addition of copper as a sintering aid improved the density and conductivity of BCGO, with the optimal content being around 2 mol%.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Zhen Wang, Luyao Ding, Shenglong Yu, Huan Xu, Xiaohui Hao, Yi Sun, Tianmin He
Summary: A comparative study was conducted to investigate the effect of different addition strategies for a sintering aid of ZnO on the performance of the BaZr0.4Ce0.4Y0.2O3-delta electrolyte. The results showed that the internally-doped sample exhibited higher relative density and lower grain boundary core barrier height, leading to higher power density and better ion transport performance.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Tomohiro Kuroha, Yoshiki Niina, Mizuki Shudo, Go Sakai, Naoki Matsunaga, Takehito Goto, Kosuke Yamauchi, Yuichi Mikami, Yuji Okuyama
Summary: This study investigates ceramic tape-casting and anode electrolyte co-firing for large-scale manufacturing of protonic ceramic fuel cells. It confirms the reactivity of certain metal elements with the anode material and reveals that NiO doping decreases the proton conductivity of all materials. The research identifies the suitable material BZYb20 for this fabrication technique.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Multidisciplinary
Donglin Han, Kazuhiro Goto, Masatoshi Majima, Tetsuya Uda
Summary: The addition of NiO in Y-doped BaZrO3, BaCeO3, and BaZr1-xCexO3 decreases dehydration temperature and proton concentration, leading to reduced ionic conductivity and transport number. This results in worse ion conductivity and brittle electrolyte in Ce-rich samples containing Ni.
Article
Electrochemistry
Dan Cao, Mingyang Zhou, Xiaomin Yan, Zhijun Liu, Jiang Liu
Summary: A tubular protonic ceramic fuel cell with BaCe0.7Zr0.1Y0.2O3-δ electrolyte was fabricated using the dip-coating technique. The cell showed good electrochemical performance, with output power even at a temperature as low as 200°C. Stability testing at 600°C showed that the cell's operating power density gradually stabilized over 30 hours of testing.
ELECTROCHEMISTRY COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Donglin Han, Lulu Jiang, Peng Zhong
Summary: This study improved the phase compatibility between BaZrO3-based electrolyte and NiO electrode substrate by adjusting the electrolyte composition and selecting proper dopants. However, high temperature heat treatment during co-sintering led to Ni diffusion into the electrolyte layer, negatively impacting performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Materials Science, Ceramics
Zidai Fan, Dan Cao, Mingyang Zhou, Ziyi Zhu, Meilong Chen, Jiang Liu
Summary: Proton-conducting perovskite oxide BaCe0.7Zr0.1Y0.2O3-delta (BZCY) is prepared using carbonate coprecipitation method with Tween-80 as the surfactant, resulting in well dispersed particles with an average size of 200 nm. The BZCY powder is used as the electrolyte material in a Ni-based anode-supported protonic ceramic fuel cell (PCFC). The electrolyte can be densified without any sintering aids at 1400 degrees C in open air, and the PCFC exhibits a peak power density of 1050 mW cm-2 at 700 degrees C, with a conducting activation energy of 0.36 eV. The superiority of the BZCY powder prepared using the coprecipitation method is demonstrated by comparing it with a BZCY powder made by conventional solid-state reaction method.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Elisa Mercadelli, Angela Gondolini, Daniel Montaleone, Paola Pinasco, Alessandra Sanson
Summary: This study presents the use of Dynamic Mechanical Analysis to characterize the thermo-mechanical behavior of green tapes, with a focus on the impact of rice starch pore former content on the tape properties and lamination process. It identified an optimal lamination viscosity (10(10) Pa s) required for suitable adhesion among the layers, regardless of the tape formulation. The study also highlighted the increase in temperature required for proper lamination with higher rice starch content in the tapes.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
L. S. Hagy, K. Ramos, M. V. Gelfuso, A. L. Chinelatto, A. S. A. Chinelatto
Summary: The reduction of sintering time and temperature for BaCe0.2Zr0.7Y0.1O3-delta was investigated using unconventional route and sintering aid. Effects of ZnO addition and microwave sintering on structure, sinterability, microstructure, and electrical conductivity were explored. Both ZnO addition and microwave sintering improved the density and conductivity, with microwave sintering providing a rapid alternative for sintering.
CERAMICS INTERNATIONAL
(2023)
Review
Chemistry, Physical
Mohd Affandi Nur Syafkeena, Muhammad Luthfi Zainor, Oskar Hasdinor Hassan, Nurul Akidah Baharuddin, Mohd Hafiz Dzarfan Othman, Chung-Jen Tseng, Nafisah Osman
Summary: Proton ceramic fuel cells (PCFCs) are a promising alternative to combustion-based electrical generators due to their high energy conversion efficiency and low carbon emission. The morphology and composition of the electrolyte materials significantly affect the electrochemical performance of PCFCs. Microstructural modification of the proton ceramic electrolyte can further optimize its performance. Cerate-zirconate ceramic perovskite-type oxides show excellent proton conductivity. This review discusses the influence of electrolyte synthesis and fabrication techniques on the electrochemical properties of PCFCs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Wojciech Skubida, Daniel Jaworski, Aleksandra Mielewczyk-Gryn, Sebastian Wachowski, Tadeusz Miruszewski, Kacper Cichy, Konrad Swierczek, Maria Gazda
Summary: This research focuses on the transport properties of high-entropy BaZr1/8Hf1/8Sn1/8Ti1/8Y1/8In1/8Sm1/8Yb1/8O3-x perovskite oxide, with a particular emphasis on proton transport. The presence of proton defects is analyzed using thermogravimetry, and the proton and deuterium conductivities are evaluated using electrochemical impedance spectroscopy. The isotope effect is observed, and the contribution of proton conductivity to the total conductivity is established. Electrical conductivity relaxation studies are performed for the first time on high-entropy oxides, allowing the calculation of water kinetic coefficients and the determination of the chemical diffusion coefficient and chemical surface exchange coefficient of water.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Yu Ma, Biao He, Jiaqi Wang, Ming Cheng, Xianzeng Zhong, Jianbing Huang
Summary: Perovskite-type yttrium-doped barium zirconate (BZY) is a promising electrolyte material for protonic ceramic fuel cells (PCFCs) due to its high conductivity and stability. A new cell structure based on porous/dense bilayer BZY electrolyte matrix was designed, showing improved performance with proper graphite content and impregnated NiO anode. This study suggests the potential of this design for cost-effective PCFC development.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Biotechnology & Applied Microbiology
Alexandre R. Lima, Nathana L. Cristofoli, Ana M. Rosa da Costa, Jorge A. Saraiva, Margarida C. Vieira
Summary: The suitability of isolation processes for producing cellulose nanofibers (CNFs) from Salicornia ramosissima waste was investigated. Both alkaline treatment and bleaching treatment were used to separate cellulose fibrils and obtain CNFs, which were further hydrolyzed by acid treatment or enzyme treatment. The results showed that both treatments effectively removed amorphous components, increased crystallinity, and exposed fibers. However, CNF(ET) exhibited higher zeta potential values and mechanical resistance compared to CNF(AT). Overall, the enzyme treatment showed potential for isolating CNFs with higher-value applications due to its environmentally friendly nature and production of thinner nanofibers.
FOOD AND BIOPRODUCTS PROCESSING
(2023)
Article
Food Science & Technology
Ricardo V. V. Duarte, Jose A. Lopes-da-Silva, Ana M. M. Gomes, Ivonne Delgadillo, Francisco J. J. Barba, Jorge A. A. Saraiva
Summary: This study observed the changes in microbiological, physiochemical, and textural properties of fresh cheeses made from cow or goat milk under hyperbaric and refrigerated storage. The results showed that hyperbaric storage at room temperature inhibited microbial growth and improved the stability of the cheeses. However, it also caused whey loss, reduction in moisture content, and textural changes. Overall, hyperbaric storage reduced microbial load and had minimal effects on quality parameters, thus extending the shelf-life of fresh cheeses.
JOURNAL OF FOOD SCIENCE
(2023)
Article
Biochemistry & Molecular Biology
Enrique Pino-Hernandez, Luiz Henrique Fasolin, Lina F. Ballesteros, Carlos A. Pinto, Jorge A. Saraiva, Luis Abrunhosa, Jose Antonio Teixeira
Summary: This study investigated the impact of high-pressure processing (HPP) and hydrothermal treatments (HT) on rejected chestnut starch. The results showed that HPP did not induce starch gelatinization and increased the size and resistant starch content of the granules. The HPP-treated starch also exhibited modified pasting properties and a novel gel structure.
Article
Chemistry, Physical
Rafael A. Raimundo, Vinicius D. Silva, Luciena S. Ferreira, Francisco J. A. Loureiro, Duncan P. Fagg, Daniel A. Macedo, Uilame U. Gomes, Rodinei M. Gomes, Marcio M. Soares, Marco A. Morales
Summary: This work investigates the magnetic behavior and electrocatalytic properties of CoFe2/CoFe2O4 composite and CoFe2 alloy obtained through proteic sol-gel synthesis. The samples were characterized using microscopy, XRD, Mossbauer spectroscopy, and magnetometry. The results show that both samples exhibit promising magnetic properties and demonstrate good electrochemical stability for the oxygen evolution reaction (OER). These materials based on transition metals, Co and Fe, have great potential in energy storage and conversion systems due to their high performance and low cost.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Review
Biochemistry & Molecular Biology
Hana Scepankova, Diogo Galante, Edelman Espinoza-Suarez, Carlos A. Pinto, Leticia M. Estevinho, Jorge Saraiva
Summary: The interest in high hydrostatic pressure (HHP) is focused on the inactivation of enzymes in foods, but it has also been studied for biotechnological applications. Each enzyme responds differently to high pressure, with some remaining active while others lose activity. High pressure can enhance enzymatic activity and increase product concentration, but it may also favor hydrolysis over synthesis.
Article
Chemistry, Multidisciplinary
Rui Queiros, Rita Ferreira, Jorge A. Saraiva, Jose A. Lopes-da-Silva
Summary: The use of vegetable proteins is being studied to develop new products and replace other protein sources. This study evaluated the effects of high-pressure processing (HPP) on the properties of pea and soy protein isolates at different pH values. HPP increased protein solubility and surface hydrophobicity, while decreasing the content of free sulfhydryl groups. The effects of HPP on emulsifying properties depended on various factors.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Multidisciplinary
Rita S. Inacio, Luis M. Rodriguez-Alcala, Ligia L. Pimentel, Jorge A. Saraiva, Ana M. P. Gomes
Summary: High-pressure processing (HPP) can be used to pasteurize raw ewes' milk Serra da Estrela cheese without affecting its lipid composition, ensuring both microbial safety and quality during storage. The total triglycerides content and the fatty acid profiles remained similar between HPP-treated and control cheeses over the course of 15 months of refrigerated storage. HPP-treated Serra da Estrela cheese exhibited a high content of conjugated linoleic acid, comparable to the control cheese, with similar atherogenic and thrombogenic indices.
APPLIED SCIENCES-BASEL
(2023)
Article
Food Science & Technology
Rita S. Inacio, Maria J. P. Monteiro, Jose A. Lopes-da-Silva, Ana M. P. Gomes, Jorge A. Saraiva
Summary: This study compared the effects of non-vacuum greaseproof paper wrapping and vacuum packaging in plastic film on Serra da Estrela cheese. The results showed that there were no significant differences in the counts of lactococci, lactobacilli, enterococci, and total mesophiles between the two packaging systems. Yeasts and molds were present in higher numbers in non-vacuum paper-wrapped cheeses. Vacuum packaging allowed for better control of cheese proteolysis and resulted in a harder texture compared to non-vacuum paper-wrapped cheeses. Overall, non-vacuum paper wrapping is suitable for short-term storage, while vacuum packaging in plastic film is preferable for long-term storage.
Article
Food Science & Technology
Carlos A. Pinto, Diogo Galante, Edelman Espinoza-Suarez, Vitor M. Gaspar, Joao F. Mano, Francisco J. Barba, Jorge A. Saraiva
Summary: This study examined the use of hyperbaric storage at room temperature to control the development of Byssochlamys nivea ascospores in apple juice. Different pasteurization methods were applied to contaminated juice samples before storage. The results showed that hyperbaric storage at room temperature inhibited ascospore development and inactivated them, effectively preventing mycotoxin production.
Article
Food Science & Technology
Ricardo M. Ferreira, Adriana M. Costa, Carlos A. Pinto, Artur M. S. Silva, Jorge A. Saraiva, Susana M. Cardoso
Summary: Opuntia ficus-indica fruits are rich in valuable compounds and have high nutritional value and health benefits. However, due to their short shelf life and increased production, there are significant post-harvest losses of these fruits. Therefore, finding ways to utilize the wasted increase in production is necessary. The chemical composition of prickly pear makes it an appealing substrate for fermentation.
Article
Biotechnology & Applied Microbiology
Sergio Sousa, Ana P. Carvalho, Carlos A. Pinto, Renata A. Amaral, Jorge A. Saraiva, Ricardo N. Pereira, Antonio A. Vicente, Ana C. Freitas, Ana M. Gomes
Summary: To make Nannochloropsis oculata a financially viable source for commercial applications, extraction efficiency needs to be improved. This study tested emerging technologies such as high hydrostatic pressure (HHP) and moderate electric fields (MEF), along with solvents with different polarity indexes, to increase accessibility and extraction yields of eicosapentaenoic acid (EPA). The combined use of HHP and MEF resulted in a 62% increase in EPA extraction yields from wet N. oculata biomass. These findings are highly relevant for the food and pharmaceutical industries, providing alternatives to traditional extraction methods with increased yields and reduced environmental impact.
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
(2023)
Article
Chemistry, Physical
Thayse R. Silva, Rafael A. Raimundo, Vinicius D. Silva, Jakeline Raiane D. Santos, Luciena S. Ferreira, Allan J. M. Araujo, Francisco J. A. Loureiro, Fausthon F. da Silva, Duncan P. Fagg, Daniel A. Macedo
Summary: This research presents a simplified sol-gel method combined with an adapted hydrothermal process to synthesize MnCo2O4 nanoparticles on nickel foam catalyst. The catalyst possesses a large surface area and the absence of binders promotes adhesion of the active material, which boosts the electrocatalytic reactions. The structural, microstructural, and surface properties of the MnCo2O4 electrode are studied through XRD, FESEM, TEM, FTIR, Raman, and XPS analysis. The electrode exhibits excellent electrochemical stability, with an overpotential of 296 mV (at 25 mA cm-2 current density) and a Tafel slope of 82 mV dec � 1, indicating its great potential for future applications.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Chemistry, Applied
Patricia Vieira, Carlos A. Pinto, Brian James Goodfellow, Ana M. Gomes, Sergio Sousa, Manuela Machado, Ivonne Delgadillo, Jorge A. Saraiva
Summary: Yoghurt fermented under sub-lethal high pressure (10, 20, 30, and 40 MPa at 43 degrees C) and refrigeration (4 degrees C for 23 days) was analyzed and compared with yoghurt fermented at atmospheric pressure (0.1 MPa). Metabolite fingerprinting, sugar and organic acid assessment, and total fatty acid determination were performed. The results showed that certain metabolites varied with increasing pressure, possibly due to the influence of pressure on specific enzymes. Yoghurts fermented at 40 MPa had lower lactose and total fatty acid content. Further research is needed to better understand fermentation processes under sub-lethal high pressure.
Article
Energy & Fuels
Vanessa C. D. Graca, Laura I. V. Holz, Allan J. M. Araujo, Francisco J. A. Loureiro, Duncan P. Fagg
Summary: To address the urgent need for alternative energy transfer methods, Proton Ceramic Membrane Reactors (PCMRs) are being investigated as a clean alternative for energy production and chemical synthesis. This study focuses on using niobium (oxy)nitride with proton ceramic conducting materials as a new composite electrode for PCMRs applications, specifically in the synthesis and fuel use of ammonia. The chemical compatibility and thermal stability of the composite electrode material were assessed, and the electrode mechanism under hydrogenation/de-hydrogenation conditions was studied using electrochemical impedance spectroscopy.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Materials Science, Multidisciplinary
Vanessa C. D. Graca, Laura I. V. Holz, Francisco J. A. Loureiro, Glenn C. Mather, Duncan P. Fagg
Summary: In recent years, there has been increasing interest in transition metal oxynitrides due to their attractive properties, such as high conductivity, hardness, and catalytic activity. Among them, niobium oxynitrides have shown great potential for various applications. This study focuses on the impact of ammonolysis conditions on the crystalline phase formation of niobium oxynitride compounds. The results demonstrate that careful control of ammonolysis conditions can tailor the anion composition, cation/anion ratio, and crystallographic structure of the materials.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
