Article
Chemistry, Physical
Deniz Lim, Goksel Ozkan, Gulay Ozkan
Summary: This study investigates the catalytic hydrolysis of sodium borohydride and ammonia boranes mixtures, focusing on the effect of Zr additive in the catalyst, different catalyst types, molar ratio of the mixture, and temperature. In-situ synthesized Zr-Ni-B catalyst shows better results compared to Ni-B catalyst and improves efficiency at lower temperatures. The addition of Zr increases the surface area of the catalyst. SEM, BET, XPS analyses are used to characterize the catalysts.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Jialu Shen, Weifeng Chen, Guo Lv, Zihan Yang, Jiaying Yan, Xiang Liu, Zhongxu Dai
Summary: Recently, graphene quantum dots-transition metal nanoparticles (GQDs-TMNPs) have been successfully applied in the hydrolysis of NH3BH3 (AB) and NaBH4, showing high dispersibility and activity. GQDs-RhNPs, GQDs-RuNPs, and GQDs-PtNPs demonstrate high catalytic activity in the hydrolysis of AB, with turnover frequencies (TOFs) reaching up to 656, 384, and 281 mol(H2)center dot mol(cat)(-1) min(-1), respectively.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Xiaofa Su, Sifang Li
Summary: A new type of PVP-stabilized bimetallic Co-Ni nanoparticles as catalyst for hydrogen production from methanolysis of ammonia borane showed good catalytic performance, magnetic recyclability, and synergistic effect between Co and Ni.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Cafer Saka
Summary: A hybrid g-C3N4-SiO2-N composite was successfully produced using calcination and hydrothermal methods. The composite catalyst showed excellent catalytic performance in the H2 production reaction from NaBH4 methanolysis, with a high hydrogen generation rate and good durability.
Review
Chemistry, Physical
Umit B. Demirci
Summary: Sodium borohydride (NaBH4) has been considered as a promising hydrogen storage material, but its hydrolysis still faces numerous obstacles. This article aims to assess the progress made in hydrolysis of NaBH4 and summarize the newly acquired knowledge.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Environmental Sciences
Senem Karahan Gulbay, Mulkiye Kaymaz, Fulya Gulbagca, Fatih Sen
Summary: This study investigates the catalyst efficiency of morpholine borane in hydrogen production and discovers that Pd50Ni50/C nanoparticles have excellent catalytic behavior and high reusability.
Article
Chemistry, Physical
Jiapeng Zhang, Jiang Li, Lijing Yang, Ran Li, Fengming Zhang, Hua Dong
Summary: The hydrolysis of ammonia borane is a reliable method for hydrogen production, and TiO2-supported RuCo catalysts synthesized in this study exhibit excellent catalytic performance, especially in alkaline solutions. The Ru1Co9/TiO2 catalyst with a Ru/Co molar ratio of 1:9 shows low activation energy and high turnover frequency for the hydrolysis of ammonia borane. Anatase TiO2-supported catalysts demonstrate better catalytic activity compared to rutile TiO2-supported catalysts or mixtures of anatase and rutile TiO2-supported catalysts.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Polymer Science
Ibrahim M. Maafa, Nasser Zouli, Ahmed Abutaleb, Ayman Yousef, Isam Y. Qudsieh, Saleh M. Matar, Abdel Samed M. Adam, M. M. El-Halwany
Summary: This study synthesized photocatalytic composite nanofibers (NiTiO3/TiO2@CNFs) using an electrospinning process and used them in hydrogen production from the photohydrolysis of ammonia borane. The results showed that the composite nanofibers exhibited good catalytic performance and could produce stoichiometric H-2 in a short time under visible light. Increasing the catalyst load and reaction temperature further improved the reaction efficiency.
Article
Green & Sustainable Science & Technology
Yufa Feng, Xiaodong Chen, Huize Wang, Xiaolei Li, Hanzhao Huang, Yu Liu, Hao Li
Summary: The study successfully synthesized Ni0.4Cu0.6Co2O4 nanoleaf-like arrays with excellent catalytic performance and stability in the hydrolysis of ammonia borane, showing promise as a substitute for precious metal-based catalysts.
Article
Biochemistry & Molecular Biology
Oscar Ramirez, Sebastian Bonardd, Cesar Saldias, Macarena Kroff, James N. O'Shea, David Diaz Diaz, Angel Leiva
Summary: The bimetallic NiPt nanoparticles were successfully loaded into alginate hydrogel beads through in situ reduction process, and the prepared hybrid hydrogels showed excellent catalytic activity and stability for the hydrolysis of ammonia borane to produce hydrogen.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Nanoscience & Nanotechnology
Yufa Feng, Xuefeng Zhang, Youxiang Shao, Xiaodong Chen, Huize Wang, Junhao Li, Ming Wu, Huafeng Dong, Quanbing Liu, Hao Li
Summary: In this study, uniform Mox-Ni0.8Cu0.2O nanowires were successfully fabricated as catalysts for ammonia borane (AB) methanolysis. The acidity of the catalysts' surface was flexibly modulated, leading to high catalytic activity. The relationship between the quantity of moderated acid sites and the activity of AB methanolysis was determined for the first time, and a plausible mechanism for the reaction was proposed.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Ibrahim Gozeten, Kadir Karakas, Yasar Karatas, Mehmet Tunc, Mehmet Gulcan
Summary: This study focuses on the production of hydrogen from sodium borohydride in a methanolysis environment using ruthenium nanoparticles impregnated on a halloysite support material. The newly synthesized nanocatalyst showed excellent activity and reusability in the catalytic methanolysis reaction. The material analysis confirmed the homogeneous distribution of ruthenium nanoparticles on the support material. Kinetic studies were conducted to calculate the kinetic parameters and determine the rate equation for hydrogen production.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Inorganic & Nuclear
Saeideh Kord, Fariba Fathirad, Daryoush Afzali, Maryam Fayazi
Summary: In this study, the four-component nanostructures of boron-cobalt-nickel-yttrium (B-Co-Ni-Y) were synthesized and characterized. The 1:1:1:2 atomic ratio was found to be the best catalyst based on catalytic performance evaluation. The affected parameters were optimized, leading to the highest hydrogen production and activation energy value. The proposed nanocatalyst showed stability during 5 sequential cycles with a slight loss of activity.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Fahriye Donmez, Nezihe Ayas
Summary: In this study, Ni/TiO2 catalysts were synthesized using the sol-gel technique and characterized through various methods, while the effects of different factors on hydrogen production performance were investigated. It was found that high hydrogen yield and production rate could be achieved under specific reaction conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Jyun-Lin Lai, Win-Jet Luo, Yean-Der Kuan, Pai-Jun Zhang
Summary: This study focused on processing water vapor to increase hydrogen production. Experimental results indicated that using a certain concentration of catalyst and appropriate operating conditions can effectively enhance hydrogen production.
Article
Chemistry, Inorganic & Nuclear
Aysel Kanturk Figen
Summary: The study focused on continuous hydrogen production from sodium borohydride through methanolytic dehydrogenation, achieving continuous H-2 production using semi-continuous regimes. Batch catalytic hydrogen generation profiles were examined and a figure of merit (FOM) was used for comparative analysis of catalysts' performance. The semi-continuous regime resulted in stable hydrogen production for almost 2.6 hours, with a production rate of 0.94 Lh(-1) from Co-O-B catalyzed methanolytic dehydrogenation of NaBH4.
Article
Chemistry, Physical
Bilge Coskuner Filiz
Summary: This study investigated the dehydrogenation kinetics of magnesium hydride in cobalt chloride aqueous solutions, finding that 6.25 wt% CoCl2 was the optimal activator concentration, leading to complete conversion of MgH2 to Mg(OH)(2) at room temperature. The approach was practical for hydrogen generation applications.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2021)
Article
Materials Science, Multidisciplinary
Beyza Nur Kinsiz, Bilge Coskuner Filiz, Serpil Kilic Depren, Aysel Kanturk Figen
Summary: This study focused on the preparation of bead type catalysts with rapid and easy recoverable properties for reusability and regeneration during ammonia borane (NH3BH3) hydrolysis. Through nano-casting, cobalt-alginate capsules were used to form surface-active beads containing Co3O4 nanoparticles, resulting in enhanced hydrogen release performance. The catalysts were able to be used for 555 minutes without mechanical damages, and enabled rapid and easy recovery at the end of the reaction for improved reuse.
APPLIED MATERIALS TODAY
(2021)
Article
Chemistry, Physical
Ozge Coskuner, Aysel Kanturk Figen
Summary: This study presents the hydro-catalytic treatment of organoamine boranes for efficient thermal dehydrogenation for hydrogen production. The Co-AC catalyst exhibited efficient catalytic activity towards organoamine boranes thermal dehydrogenation, significantly improving the hydrogen release kinetics. Overall, the hydro and catalytic treatment showed a remarkable synergistic effect in thermal dehydrogenation, enhancing the hydrogen release kinetics.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Biochemistry & Molecular Biology
Bilge Coskuner Filiz, Yeliz Basaran Elalmis, Irem Serra Bektas, Aysel Kanturk Figen
Summary: This study successfully designed a stable CS/PVA nanofiber structure for naked-eye colorimetric glucose detection using cost-effective electrospinning technology. The nanofibers exhibited good stability and readability, showing linear glucose analysis response in experiments and achieving significant color changes.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Chemistry, Physical
Ozge Coskuner, Carlos A. Castilla-Martinez, Oscar Sonzogni, Eddy Petit, Umit B. Demirci, Aysel Kanturk Figen
Summary: A two-step process has been developed to produce formic acid by hydrogenation of CO2 using sodium borohydride in aqueous solution at ambient conditions. The process aims at capturing and transforming CO2 effectively at ambient conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Ozge Coskuner, Aysel Kanturk Figen
Summary: This study evaluates the semi-continuous regime for hydrogen generation from carbon derivatives of ammonia borane using cobalt-doped activated carbon catalyst. Different carbon derivatives exhibit different hydrogen generation rates due to their varying thermal stability. The kinetic rate and activation energy of the hydrolysis reaction are described using power-law and zero-order kinetic models. After the semi-continuous regime, the catalyst remains stable and no leaching of cobalt species into the exhaust solution is observed, although boron accumulation occurs.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Bilge Coskuner Filiz, Aysel Kanturk Figen
Summary: This study aims to develop easily recoverable and regenerated catalysts for efficient hydrogen production from alkyl-substituted amine boranes. The results showed that alkyl-substituted amine boranes exhibited slower hydrogen generation rates compared to ammonia borane in the presence of catalysts. Among the different activated carbon support types, the catalyst supported on granule activated carbon demonstrated the best catalytic performance and recyclability activity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Multidisciplinary
Carlos A. CASTILLA-MARTINEZ, Bilge COSKUNER FILIZ, Eddy PETIT, Aysel KANTURK FIGEN, Umit B. DEMIRCI
Summary: Ammonia borane mixed with palladium chloride was used as a reactive solid to trap and convert carbon dioxide, resulting in the formation of various compounds. The study also demonstrated the conversion of CO2 into graphitic carbon.
FRONTIERS OF MATERIALS SCIENCE
(2022)
Article
Chemistry, Physical
Hulya Civelek Yoruklu, Bilge Coskuner Filiz, Aysel Kanturk Figen, Bestami Ozkaya
Summary: Nanoparticles (NPs) are used as enhancement additives in biohydrogen production due to their unique features. In this study, the effectiveness and feasibility of NPs in enhancing biohydrogen production over Clostridium sp. were evaluated using the two-stage TOPSIS method. Iron-containing NPs (hematite, magnetite) were determined to be the most effective and economical NPs for increasing the yield.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Electrical & Electronic
Havva Hande Cebeci, Ibrahim Yilmaz, Oender Yargi, Korkut Acikalin, Ali Gelir, Aysel Kanturk Figen
Summary: Upcycling of electronic waste into metal contented pyrolytic carbon (C-WPCB) was achieved through simple pyrolysis, and the obtained C-WPCB was utilized for supercapacitor electrode preparation. The electrode prepared in 1.5 M H2SO4 solution showed the best performance with specific capacitance, specific power, and specific energy of 39.5 F/g, 25.0 kW/kg, and 16.5 Wh/kg at 5 A/g, respectively.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Environmental Sciences
Havva Hande Cebeci, Korkut Acikalin, Aysel Kanturk Figen
Summary: This study aimed to characterize and determine the kinetic parameters of pyrolysis of printed circuit board (PCB) wastes, and analyze the evolved gases at different particle sizes. SEM-EDS, SEM-Mapping, and FTIR were used to examine the structures of PCB wastes. Non-isothermal TG-FTIR analyses were conducted to study the thermal decomposition of PCB wastes, revealing four stages of decomposition with the second stage being the main pyrolysis stage. The apparent activation energies (Ea) for the main pyrolysis stage varied with particle size, contrary to previous studies, and the evolved gas analyses showed that CO2 was the most common emission associated with the decomposition of plastic, brominated compounds, polycarbonate, and epoxy resins in PCB wastes.
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT
(2023)
Article
Chemistry, Physical
Hulya Civelek Yoruklu, Bilge Coskuner Filiz, Aysel Kanturk Figen, Bestami Ozkaya
Summary: Enhancing biohydrogen production by adding nano-sized iron oxide doped metal oxides, especially Fe2O3 doped Al2O3, shows great potential.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)