Article
Chemistry, Physical
Jing Jiang, Shiyu Yang, Huili Lei, Lunhong Ai
Summary: Porous carbon nanostructures as supports can stabilize highly dispersed metal nanoparticles and facilitate mass transfer in reactions; catalytically active porous structures were synthesized and characterized for the efficient catalytic hydrolysis of NaBH4; the prepared Co@NC-600 sample shows high activity due to the catalytically active metallic Co and suitable support effect of N-doped carbon.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Minoo Bagheri, Yeganeh Amidi, Mohammad Yaser Masoomi
Summary: In this study, quasi-ZIF-67 (Q-ZIF-67) with large-scale structural defects was synthesized via controlled thermal partial deligandation. Q-ZIF-67 exhibited enhanced catalytic activity for hydrolysis of NaBH4, generating hydrogen at a high rate under mild conditions. Mechanistic studies revealed the importance of strong acidity for efficient hydrogen generation.
Article
Nanoscience & Nanotechnology
Yi Wang, Xiang Liu
Summary: A series of magnetic recyclable cobalt ferrite-modified transition-metal nanoparticles were developed for catalytic hydrolytic dehydrogenation of NaBH4 for H-2 evolution, with Ru/CoFe2O4 and Pd/CoFe2O4 exhibiting the highest catalytic activities. CoFe2O4 was found to be the key factor in facilitating H-2 production in this work.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Physical
Burcu Kiren, Nezihe Ayas
Summary: Hydrogen is expected to play a crucial role as an environmentally friendly and flexible energy carrier in future energy systems. This study investigates the effects of catalyst composition and reaction conditions on hydrogen yield in the hydrolysis of NaBH4, and identifies that a catalyst with 40 wt% Ni content exhibits the best performance under specific conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
O. V. Netskina, E. S. Tayban, V. A. Rogov, A. M. Ozerova, S. A. Mukha, V. I. Simagina, O. V. Komova
Summary: In the study, it was found that cobalt catalysts are more active than nickel catalysts in the hydrolysis of sodium borohydride. One reason for the lower activity of nickel catalysts is the presence of hydrogen on its surface, which interferes with reactant adsorption. The addition of cobalt to nickel catalysts can enhance hydrogen generation rate.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Environmental
Geo Jong Kim, Hyun Tae Hwang
Summary: Hydrogen from sodium borohydride can be generated by thermolysis or hydrolysis, but both methods have drawbacks such as high temperatures required or safety concerns. A new process, thermal hydrolysis of SBH, is proposed to address these issues and achieve efficient hydrogen production.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Yuqian Yu, Li Kang, Lixian Sun, Fen Xu, Hongge Pan, Zhen Sang, Chenchen Zhang, Xinlei Jia, Qingli Sui, Yiting Bu, Dan Cai, Yongpeng Xia, Kexiang Zhang, Bin Li
Summary: In this study, a porous titanium oxide cage (PTOC) catalyst was successfully synthesized, and its synergistic effect with PtNi alloy particles resulted in a high hydrogen generation rate and low activation energy. The robust porous structure of PTOC effectively prevented agglomeration issues and ensured the long-term stability of the catalyst.
Article
Chemistry, Physical
Aybike Paksoy, Samira F. Kurtoglu-Oztulum, M. Baris Yagci, Ozge Balci-Cagiran
Summary: In this study, a series of nanocatalysts were developed through a mechanochemical route followed by a wet milling step. These catalysts exhibited excellent catalytic performance and durability at room temperature, making them suitable for efficient hydrogen production via the hydrolysis of sodium borohydride.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Yiting Bu, Jiaxi Liu, Hailiang Chu, Sheng Wei, Qingqing Yin, Li Kang, Xiaoshuang Luo, Lixian Sun, Fen Xu, Pengru Huang, Federico Rosei, Aleskey A. Pimerzin, Hans Juergen Seifert, Yong Du, Jianchuan Wang
Summary: In this study, Co nanoparticles supported on bagasse-derived porous carbon (Co@xPC) were synthesized for catalytic hydrolytic dehydrogenation of NaBH4. The Co@150PC catalyst showed high hydrogen generation activity and excellent durability. The results indicate that the Co@xPC structure enhances the hydrolysis efficiency of NaBH4.
Article
Chemistry, Physical
Wenkai Huang, Fuhua Xu, Xiang Liu
Summary: Adding nonprecious metal Co or Ni to Ru enhances the H2 generation efficiency synergistically, while alloying with Fe or Cu impedes it. Among them, Co-Ru/C exhibits the highest catalytic activity for H2 generation, with a TOF of 117.69 mol(H2)•molRu-1•min-1, significantly higher than Ru/C's 57.08 mol(H2)•molRu-1•min-1. Moreover, Co-Ru/C shows a TOF of 436.51 mol(H2)•molRu-1•min-1 (96.7 L(H2)•gRu-1•min-1) in the presence of NaOH.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Meryem Sena Akkus
Summary: In this study, nickel, nickel-chromium alloy, and nickel-vanadium alloy were coated to form a thin film on the slides prepared by magnetron sputtering process as catalysts for the hydrolysis of alkaline sodium borohydride. The effects of solution temperature, catalyst amount, initial pH, and catalyst performance on hydrogen generation rate were investigated using response surface methodology. The maximum hydrogen generation rates for Ni, NiCr, and NiV catalysts were determined under optimized conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Valentina G. Minkina, Stanislav I. Shabunya, Vladimir I. Kalinin, Vladimir V. Martynenko
Summary: This study investigated the catalytic hydrolysis of aqueous NaBH4 solutions and found that the catalyst used showed stable catalytic activity. It was also observed that conducting the hydrolysis under near adiabatic conditions significantly reduced the hydrolysis time.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Cigdem Tuc Altaf, Tuluhan O. Colak, Valentina G. Minkina, Stanislav Shabunya, Mehmet Sankir, Nurdan Demirci Sankir, Vladimir Kalinin
Summary: This study reveals the influence of structural differences in titanium dioxide (TiO2) as supporting materials for cobalt (Co) nanoparticles in aqueous and alkaline sodium borohydride (NaBH4) hydrolysis. The activation energies for TiO2/Co catalysts in aqueous and alkaline solutions were calculated, and the hydrogen generation rate (HGR) was determined. The results showed that the structural differences in TiO2 affected the catalytic performance of Co nanoparticles, and the TiO2/Co catalysts had higher HGR in the aqueous-alkaline solution.
Article
Thermodynamics
Jae Seon Koh, Do Hoon Kim, Se Hyeok Lee, Min Soo Kim
Summary: The aim of this study was to produce sufficient hydrogen for high-power fuel cell applications through acid-accelerated hydrolysis of sodium borohydride (SBH) with liquid water. The experimental results showed that the conversion of SBH was >= 95%, and a maximum of 6.71 wt% gravimetric hydrogen density was achieved. It was also found that the rate of hydrogen generation could be controlled through the feed injection rate, and the reactant temperature and excess stoichiometric number had significant effects on the hydrogen production.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Chemistry, Physical
Dinh Trinh Tran, Tap Huu Van, Yu-chih Tsai, Kun-Yi Andrew Lin, Tuan Dinh Duong
Summary: This study reports the design and fabrication of a cobalt-based catalyst for the hydrolysis of sodium borohydride (NaBH4), which shows excellent catalytic activity and stability. The hierarchical porous hollow core-shell framework cobalt oxide (HCSCO) catalyst exhibits a high H-2 generation rate and a low activation energy. Compared to other catalysts, HCSCO demonstrates superior performance. This research provides a valuable strategy for the synthesis and fabrication of efficient catalysts.
Article
Chemistry, Physical
Serdar Akbayrak, Gulhan Cakmak, Tayfur Ozturk, Saim Ozkar
Summary: Magnetic isolable ruthenium(0), rhodium(0), and palladium(0) nanoparticles supported on carbon-coated iron particles were synthesized and used as catalysts for hydrolysis of ammonia borane. The catalysts demonstrated high reactivity and turnover frequency at room temperature, showing great potential for industrial applications.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Sibel Duman, Bulent Kaya, Fatma Caf, Baris Enez, Sema Aguloglu Fincan
Summary: In this innovative study, microorganisms such as Bacillus simplex bacteria were used as a bio-supporter agent of iron to release hydrogen from sodium borohydride hydrolysis for the first time. Fe2O3@BS NPs were successfully used as a catalyst for the reaction, resulting in the formation of highly active, stable, and durable biocatalysts-like Fe2O3@BS NPs.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Serdar Akbayrak, Yalcin Tonbul, Saim Ozkar
Summary: The study demonstrates that Rh0/WO3 (0.5% wt. Rh) catalyst shows high catalytic activity in the hydrolysis of ammonia borane, mainly attributed to its reducible nature as the support. Additionally, compared to colloidal(0) nanoparticles, Rh0/WO3 (0.5% wt. Rh) catalyst exhibits better performance in terms of activity, recyclability, and reusability.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Review
Chemistry, Physical
Saim Ozkar
Summary: This review summarizes recent studies on the preparation and use of magnetically separable transition metal nanoparticles (TMNs) as reusable catalysts for the hydrolytic dehydrogenation of ammonia borane (AB). Research includes intrinsically magnetic TMNs, core-shell multimetallic nanoparticles, and TMNs supported on various materials.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Nanoscience & Nanotechnology
Serdar Akbayrak, Saim Ozkar
Summary: The development of a new platinum nanocatalyst with superb catalytic activity and excellent reusability for hydrogen generation from ammonia borane has been reported. The catalyst shows the highest turnover frequency among reported platinum nanocatalysts developed for this purpose.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Serdar Akbayrak, Saim Ozkar
Summary: In this study, magnetically separable Pt-0/CoFe2O4 nanoparticles were prepared and found to exhibit high catalytic activity and outstanding reusability in the hydrolysis of ammonia borane.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Physical
Enis Oguzhan Eren, Saim Ozkar
Summary: This review provides an overview of recent advances in developing highly efficient heterogeneous catalysts for the selective electroreduction of CO2 to CO, considering mechanistic investigations and basic catalytic requirements. It compares the efficiency of different combinations of transition metals with various supporting materials, and addresses the current challenges in designing future research in this field.
JOURNAL OF POWER SOURCES
(2021)
Article
Energy & Fuels
Saim Ozkar
Summary: This article reports on how to increase the overall catalytic performance of precious platinum nanocatalysts in the hydrolytic dehydrogenation of ammonia borane. The approaches mentioned include the use of colloidal nanoparticles, supporting the nanoparticles on large surface area materials, selecting suitable oxide support, downsizing the nanoparticles, and using magnetic powder materials as support. These methods can enhance the utilization efficiency and performance of platinum nanocatalysts.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Physical
Kadir Ulutas, Mansour Alshawesh, Sibel Duman
Summary: This study explores the utilization of waste-bio white-flowering horse-chestnut seed as a supporter for tri-metallic RuNiPd nanoclusters. The synthesized RuNiPd@WFHC nanoclusters exhibited specific surface morphologies and meso-porous structures, showing great catalytic performance in the dehydrogenation of dimethylamine-borane. The detailed analysis and kinetic studies provide valuable insights into the eco-friendly application of WFHC in catalysis.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Serdar Akbayrak, Saim oezkar
Summary: A new palladium(0) nanocatalyst has been developed to enhance the catalytic efficiency of precious metal catalysts in hydrogen generation from the hydrolytic dehydrogenation of ammonia borane. The catalyst exhibits high activity and superb stability, and has magnetically isolable properties.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Derya Ozhava, Sibel Duman
Summary: In this study, the in-situ synthesis of four different metal(0) nanoparticles (Pd, Cu, Ru, and Ni) loaded on cellulose (MNPs@Cellulose) and their catalytic activity in the solventless dimethylamine-borane dehydrogenation were investigated. The optimal metal loading percentages and cellulose amounts were determined, and the Arrhenius activation energies were calculated for each metal nanoparticles.
Article
Chemistry, Multidisciplinary
Sibel Duman, Derya Ozhava
Summary: This study discusses the detailed results of a study on the in-situ formation and catalytic use of metal nanoparticles [Ru(0), Ni(0) and Cu(0)] stabilized on starch, a biodegradable and natural polymer, in the absence of a solvent. It was found that all three metals were well-stabilized on the starch surface with a particle size of about 10.0 nm, and showed high activity in hydrogen production from the dehydrogenation of dimethylamine borane (DMAB) at 35.0 +/- 0.1 degrees C, with remarkable initial TOF and TTON values.
Article
Chemistry, Physical
Saim O''zkar, Luke T. Machale, Richard G. Finke
Summary: Synthetic conditions have been discovered to produce massive submicron-sized yet near-uniform Ir-0 particles for the first time. The deliberate addition of Bu3N plays a crucial role in the formation of these particles.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Review
Chemistry, Multidisciplinary
Dogan Akbulut, Saim Ozkar
Summary: This article reviews the catalytic conversion of glycerol to lactic acid in an alkaline medium, discussing the reaction conditions, catalytic activity, and selectivity. The use of different homogeneous and heterogeneous catalysts is discussed, along with proposed mechanisms for glycerol oxidation and the formation of side products.
Review
Materials Science, Multidisciplinary
Christopher B. Whitehead, Saim Ozkar, Richard G. Finke
Summary: The review examines the 1950 model proposing the formation of monodisperse particles and analyzes the experimental support for the concepts of burst/instantaneous nucleation and diffusion-controlled growth. Through a critical look at 164 papers that cited the model since 1950, the review questions the validity of the model's assumptions over the past 70 years.
MATERIALS ADVANCES
(2021)
