Article
Materials Science, Multidisciplinary
Juan Wang, Li-jun Yang, Xiao-chong Zhao, Pan Yang, Wei Cao, Qing-song Huang
Summary: Bimetal materials derived from transition metals can serve as good catalyst candidates for specific reactions, particularly when loaded on graphene for enhanced performance in sodium borohydride hydrolysis. A simple thermal reduction strategy was used to prepare NixCo10-x series bimetal catalysts, with Ni1Co9 exhibiting the best catalytic performance. The inclusion of graphene as a supporting frame led to Ni1Co9@Graphene with a large surface area and high turnover frequency for efficient catalytic properties in H₂ generation.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2021)
Article
Chemistry, Physical
Wei Chen, Shunlong Ju, Yahui Sun, Tianren Zhang, Juan Wang, Jikai Ye, Guanglin Xia, Xuebin Yu
Summary: A high-efficiency and reversible hydrogen storage of sodium borohydride (NaBH4) has been achieved at a low temperature (400 degrees C) with the help of bimetallic nanoporous carbon nanosheets. The reversible transformation between NiB/CoB and Ni2B/Co2B acts as a B reservoir and decreases the Gibbs free energy change, while the catalytic role of in situ formed Co2B/Ni2B promotes the H-2 desorption performance of NaBH4.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Materials Science, Multidisciplinary
Wang Lei, Huiming Jin, Jichen Gao, Yuerong Chen
Summary: The study demonstrates that the amorphous Co-Mo-B alloy supported on reduced graphene oxide shows higher hydrogen generation rate and better cycling stability, making it a promising catalyst for hydrogen generation from NaBH4 hydrolysis.
JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Chemistry, Physical
Guo Li, Niyi Wei, Yi Wang
Summary: In this study, a trace Ru-based RuCo bimetallic alloy catalyst was prepared through a simple impregnation reduction approach and the hydrolysis catalysis of ammonia borane (AB). The activity of the catalyst is mainly determined by the composition of Ru and Co metals. The high catalytic activity of Ru0.075Co0.925/NPC can be attributed to the active cluster ensemble effect of the bimetallic RuCo alloy, which exhibits the random stacking of rigid geometry and more d-electron layers without filling, leading to strange catalytic properties. Additionally, the co-alloying effect between Ru and Co NPs improves the hydrolysis performance of AB. This experimental study provides a promising approach for high catalytic activity and the potential of hydrogen production from chemical storage materials.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Organic
Timothy D. Schoch, Mukulesh Mondal, Jimmie D. Weaver
Summary: An economical method using NaBH4 for removing fluorine from highly fluorinated arenes was presented. A novel organic dye based on carbazole phthalonitrile was synthesized in two steps, demonstrating its photoactivity and ability to facilitate isomerization.
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
Materials Science, Multidisciplinary
Umme Thahira Khatoon, Aditya Velidandi, G. V. S. Nageswara Rao
Summary: This study reports a simple and economic method for the synthesis of nano-sized silver particles, which showed effective antimicrobial activity and low cytotoxicity. These silver nanoparticles can be potentially used as antimicrobial agents in biomedical applications.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Inorganic & Nuclear
Umme Thahira Khatoon, Aditya Velidandi, G. V. S. Nageswara Rao
Summary: Copper oxide nanoparticles were synthesized using oxalic acid, sodium borohydride, and tri-sodium citrate as both reducing and stabilizing agents. Different concentrations of metal precursor and reducing agent were tested. The synthesized nanoparticles showed maximum absorbance in the range of 200 nm to 450 nm. XRD and EDX confirmed the synthesis of CuO NPs. S-CuO NPs exhibited the best particle size and surface charge, as well as the highest antibacterial activity against various bacteria.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Engineering, Chemical
Hamed Jafarzadeh, Ceren Karaman, Afsin Gungor, Onur Karaman, Pau-Loke Show, Parisa Sami, Abbasali Abouei Mehrizi
Summary: In this study, the kinetics of hydrogen production in alkaline sodium borohydride hydrolysis were enhanced by using a cobalt ferrite anchored nitrogen-and sulfur-doped graphene catalyst. An optimal artificial neural network (ANN) model was developed to predict hydrogen production rate under different operational conditions.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
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.
Article
Chemistry, Multidisciplinary
Mir Ghasem Hosseini, Vahid Daneshvari-Esfahlan, Sigrid Wolf, Viktor Hacker
Summary: Nitrogen-doped reduced graphene oxide-supported palladium-cobalt nanoparticles are synthesized and used as an efficient and cost-effective anodic catalyst for direct hydrazine-hydrogen peroxide fuel cells. The catalyst shows uniform metal nanoparticle distribution and excellent catalytic performance, making it a promising candidate for fuel cell applications.
Article
Materials Science, Multidisciplinary
Yan Wang, Jian Ren, Jiaxin Ma, Fengyan Xu, Ke Zhang, Qiuju Sun, Zhongqiu Cao, Guode Li, Shiwei Wu
Summary: Co-Fe-B@g-C3N4/Cu sheet was successfully prepared via chemical deposition process. The optimized weight of g-C3N4, 0.005 g, resulted in a catalyst with unique surface structure that exhibited improved catalytic performance in the hydrolysis of NaBH4 solution. Under visible light irradiation, a HGR of 8343 mL•min-1•g-1 and Ea of 48.4 kJ•mol-1 were achieved, surpassing most reported non-precious metal and precious metal catalysts. This work offers a viable method for manufacturing non-noble metal catalysts with high catalytic properties in the hydrolysis of NaBH4 solution.
Article
Materials Science, Ceramics
Enlei Zhang, Rui Xu, Lijie Wang, Jiaojiao Chen, Bengui Zhang, Guosheng Wang
Summary: This work focuses on the hydrogen production from sodium borohydride (NaBH4) hydrolysis using homogeneous copper ferrite (CuFe2O4) nanocubes. The nanocubes, produced without the use of surfactants, exhibited good catalytic activity and recyclability in the hydrolysis process. The hydrogen production rate reached up to 1.5 L/min/g at 303K, which is significantly higher than other CuFe2O4 materials. The effects of NaOH concentration, NaBH4 concentration, and reaction temperature were investigated, and the nanocubes were found to have a low activation energy of 41.53 kJ/mol.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Noemi Leick, Ba L. Tran, Mark E. Bowden, Thomas Gennett, Tom Autrey
Summary: This study investigated the thermal stability of coordination complexes formed between different glymes with Mg(BH4)(2), revealing diverse phase transitions, speciations, and decomposition pathways despite their structural similarities.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Mengchen Song, Liuting Zhang, Zhendong Yao, Jiaguang Zheng, Danhong Shang, Lixin Chen, Hong Li
Summary: This study investigates the mechanism of kinetics decline during cycling of MgH2, revealing the grain growth in MgH2 and Fe nanocatalysts as the main cause of capacity loss and kinetic degradation.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Energy & Fuels
Ali Rasw Hamad, Hatice Calis, Aykut Caglar, Hilal Kivrak, Arif Kivrak
Summary: The study involved the synthesis of novel indole derivatives catalysts ITFM and ITTM, with electrochemical analysis showing that ITTM exhibited superior glucose electrooxidation activity and stability compared to ITFM.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Environmental Sciences
H. Kivrak, D. Saleh, D. Alpaslan, A. Caglar, K. Selcuk, T. E. Dudu, N. Aktas
Summary: The preparation of titanium dioxide supported cadmium catalysts at different cadmium loadings altered the surface electronic properties and crystal structure, leading to enhanced photocatalytic degradation of methylene blue.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Omer Faruk Er, Hilal Kivrak, Omruye Ozok, Sebahattin Celik, Arif Kivrak
Summary: The COVID-19 crisis has a serious impact on ovarian cancer patients, highlighting the importance of early detection. In this study, a PTTC-based sensor was designed to detect CA-125, a common marker for ovarian cancer, with higher precision and speed using electrochemical methods. The PTTC-based GCE electrode showed promising sensitivity and reliability for CA-125 detection, with optimum conditions determined as 3 μL PTTC loading, 5000 ng/mL CA125 antigen concentration, and 30 min incubation time. The linear range of this electrode was found to be 1-100 ng/mL, with a limit of detection of 0.0096 ng/mL and a limit of quantification of 0.0288 ng/mL. These findings suggest that PTTC is a novel and promising material for the detection of ovarian cancer antigen CA-125.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Engineering, Electrical & Electronic
Sefika Kaya, Yonca Yilmaz, Omer Faruk Er, Duygu Alpaslan, Berdan Ulas, Tuba Ersen Dudu, Hilal Kivrak
Summary: In this study, bimetallic RuPd/carbon nanotube (RuPd/CNT) electrocatalysts with different molar ratios were synthesized and characterized using advanced techniques. The Ru60Pd40/CNT catalyst exhibited the highest current mass activity, making it a promising anode catalyst for direct borohydride fuel cells (DBFC) with good stability and high activity.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Physical
Tulin Avci Hansu
Summary: The goal of this study is to achieve controlled hydrogen production rate through the hydrolysis of sodium borohydride (NaBH4) using appropriate catalysts. The effects of NaBH4 and alkaline solution concentrations, catalyst quantity, and temperature on hydrogen generation rate (HGR) were investigated, and the best Ru-based catalyst was identified. By applying energy and exergy analysis to the hydrogen production step, the energy and exergy efficiency of the system were determined to be 24% and 7%, respectively.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Tulin Avci Hansu
Summary: A novel RuW/MWCNT catalyst was synthesized successfully for the hydrolysis reaction of NaBH4. The addition of W to Ru on MWCNT support increased the catalyst activity. Surface characterization of the catalyst was performed using SEM-EDX, XRD, XPS, and TEM analysis methods. The hydrolysis performance of RuW/MWCNT catalyst was investigated by studying parameters including temperature, catalyst amount, NaBH4 concentration, and NaOH concentration.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Sefika Kaya, Aykut Caglar, Hilal Kivrak
Summary: In this study, carbon nanotube supported catalysts with different compositions and weight percentages were synthesized and characterized. The addition of metals and the formation of alloys were found to have a significant impact on the catalytic activity. Among them, the Ga@PdAgCo/CNT catalyst showed good performance in hydrazine electrooxidation.
Article
Energy & Fuels
Sefika Kaya, Omruye Ozok-Arici, Arif Kivrak, Aykut Caglar, Hilal Kivrak
Summary: An efficient synthesis method for 2-(2,5-dimethylphenyl)-3-iodobenzo[b]thiophene was developed and its performance as an anode catalyst was investigated. The Pd-doped benzothiophene organic catalyst showed high stability and low charge transfer resistance, indicating its potential as an alternative electro-catalyst in fuel cell applications.
Article
Chemistry, Physical
Hilal Kivrak, Nahit Aktas
Summary: Carbon nanotube (CNT)-supported Ga@PdAgCo catalysts were synthesized using a sequential reduction method. The catalysts were characterized and their electrooxidation performances for formic acid and ethylene glycol were evaluated. The results showed that the 0.5% Ga@PdAgCo(80:10:10/CNT) catalyst exhibited the best activity for both formic acid and ethylene glycol electrooxidation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Analytical
Aykut Caglar, Omer Faruk Er, Nahit Aktas, Hilal Kivrak
Summary: Activated carbon, graphene, reduced graphene oxide, carbon nanotube supported CdTe photocatalysts were synthesized and characterized. The electrochemical analyses indicated that CNT-supported CdTe catalyst exhibited better catalytic activity, stability, and resistance for photocatalytic glucose electrooxidation.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Engineering, Electrical & Electronic
Sefika Kaya, Aykut Caglar, Hilal Kivrak
Summary: In this study, Ga@PdAgCo catalysts were prepared using carbon nanotubes as support material. The catalysts were characterized and analyzed using various analytical techniques. The 7% Ga@PdAgCo(CNT) catalyst exhibited the best electrochemical activity and specific activity, making it a potential anode catalyst for direct glucose fuel cells.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Environmental Sciences
Tuelin Avci Hansu, Fevzi Hansu, Murat Akdemir
Summary: This study demonstrates the conversion of Prunus spinosa seed waste biomass into supercapacitor active material through different activation processes. The obtained electrodes showed improved capacitance values and surface areas. The research highlights the great potential of these electrodes for energy storage in terms of cost, efficiency, capacity, and stability.
WASTE AND BIOMASS VALORIZATION
(2023)
Article
Chemistry, Multidisciplinary
Aykut Caglar, Hilal Kivrak, Nahit Aktas
Summary: The sequential sodium borohydride (SBH, NaBH4) reduction method was used to prepare different catalysts. XRD, SEM-EDS, TEM, and XPS analyses were performed to characterize the catalysts. Electrochemical measurements were conducted to evaluate the catalytic activity of the catalysts for glucose electrooxidation. The 0.1% (CdSe-CNT)/CdTe catalyst exhibited the highest catalytic activity, stability, and resistance with a specific activity of 2.4 mA cm(-2).
Article
Energy & Fuels
Aykut Caglar, Tulin A. Hansu, Omer Sahin, Hilal Kivrak
Summary: This study investigates the effect of Co addition on Pd in PdCo/CNT catalysts prepared via the SBH reduction method. The PdCo(70-30)/CNT catalyst exhibits high specific activity, electrochemical active surface area, and stability, making it a promising catalyst for NaBH4 electrooxidation reaction.
Article
Energy & Fuels
Hilal Kivrak, Sarwar Khalid, Aykut Caglar, Duygu Alpaslan, Kadir Selcuk, Tuba Ersen Dudu, Nahit Aktas
Summary: Poly(methacrylic acid) hydrogel and Pd-doped poly(MA) hydrogel electrodes were constructed on graphite pencil and showed promising formic acid electro-oxidation activity, with a current density of 60 mA. The electrodes were characterized by various analytical techniques and exhibited higher electro-catalytic activity compared to literature values, making them potential candidates for formic acid electro-oxidation.
