Article
Chemistry, Physical
Natthapong Pongpichayakul, Suwaphid Themsirimongkon, Suphitsara Maturost, Kanlayawat Wangkawong, Li Fang, Burapat Inceesungvorn, Paralee Waenkaew, Surin Saipanya
Summary: Catalyst composites based on carbon loaded with Pt and CeO2 have been successfully prepared for methanol oxidation in direct-methanol fuel cells (DMFCs), showing enhanced catalytic performance and reduced CO poisoning by modifying carbon surfaces with CeO2 and Pt nanoparticles.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Multidisciplinary
Islam M. Al-Akraa, Ahmed E. Salama, Yaser M. Asal, Ahmad M. Mohammad
Summary: The study introduced a NiOx/Pt/CNTs/GC catalyst that significantly enhanced the electro-oxidation activity of formic acid and exhibited better tolerance against CO poisoning. By driving the reaction mechanism exclusively via the desirable direct dehydrogenation pathway, the catalyst suppressed the undesirable poisoning dehydration route and showed improved performance in direct formic acid fuel cells.
ARABIAN JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
W. Zhao, F. Xie, M. Gan, L. Ma, Y. Zhang, X. Li, L. Wang, X. Hua
Summary: Efficient strategies for constructing durable and active Pt-based electrocatalysts for methanol oxidation reaction (MOR) are of great significance for the application of direct methanol fuel cells (DMFCs). This study reports a facile pyrolysis procedure to fabricate carbon layer wrapped PtFeCo alloy nanoparticles supported on nitrogen-doped carbon nanotubes (NCNT). The nitrogen-doped carbon support is highly graphitized, and the PtFeCo particles are firmly wrapped by the graphitized carbon, leading to improved durability and activity of the catalyst.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Cyril Tlou Selepe, Sandile Surprise Gwebu, Thabo Matthews, Tebogo Abigail Mashola, Ludwe Luther Sikeyi, Memory Zikhali, Nobanathi Wendy Maxakato
Summary: Carbon nano-onions (CNOs) were successfully synthesized using flame pyrolysis, with Pd-Sn/CNOs electro-catalysts showing improved performance in methanol and ethanol electro-oxidation under alkaline conditions. The characterization techniques confirmed the structure and properties of the materials, with PdSn alloy formation on the CNO surface contributing to the enhanced catalytic activity.
Review
Energy & Fuels
Mike O. Ojemaye, Anthony Okoh
Summary: Platinum catalysts in fuel cells have gained attention for their high catalytic activity and durability, with nanomaterials opening new possibilities. China and the USA are the leading countries in research in this field.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Chemistry, Physical
Bilquis Ali Al-Qodami, Hafsa H. Alalawy, Islam M. Al-Akraa, Sayed Youssef Sayed, Nageh K. Allam, Ahmad M. Mohammad
Summary: A novel electrochemical engineering method utilizing intersected ferric oxyhydroxide nanotubes for synthesizing spherical Pt nanoparticles showed remarkable catalytic performance in direct formic acid fuel cells, effectively eliminating the issue of permanent CO poisoning and hinting at quick industrialization potential for the technology.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Energy & Fuels
Wei Kong, Zhen Han, Siyu Lu, Meng Ni
Summary: The introduction of a heat bar design can improve the performance and durability of direct carbon solid oxide fuel cells by enhancing temperature uniformity, increasing the Boudouard reaction rate, and reducing the temperature difference between maximum and minimum temperatures by 40%.
Article
Chemistry, Multidisciplinary
Md. Fahamidul Islam, Jahir Ahmed, M. Faisal, Jari S. Algethami, Kentaro Aoki, Yuki Nagao, Farid A. Harraz, Mohammad A. Hasnat
Summary: This study investigated the performance of an iridium-oxide-layer-deposited platinum surface as a catalyst for ethanol oxidation reaction in an alkaline medium. Results showed that while the pure platinum catalyst exhibited higher activity towards EtOR compared to IrOx-Pt, the latter had better CO tolerance and stability. The cyclic voltammetry analysis indicated that the electrode reaction was limited by mass transfer.
NEW JOURNAL OF CHEMISTRY
(2023)
Review
Chemistry, Physical
Liang Ding, Tang Tang, Jin-Song Hu
Summary: In this review, the recent progress in understanding the active sites of M-N-C catalysts and the relationships between the structures of catalysts/catalyst layers and device performances are summarized. Delicately designed synthetic strategies at the catalyst level suggest that attractive device performances can be achieved by tailoring the intrinsic activity and density of the catalyst active sites while engineering the porosity of catalysts. Integrating catalyst ink into cathode catalyst layers in PGM-free PEMFCs is crucial for translating the impressive ORR performance of catalysts in RDE tests to fuel cell performance.
ACTA PHYSICO-CHIMICA SINICA
(2021)
Article
Chemistry, Multidisciplinary
M. Zikhali, T. Matthews, C. T. Selepe, K. A. Adegoke, K. Mugadza, S. S. Gwebu, N. W. Maxakato
Summary: Palladium carbon nanotubes and palladium-niobium carbon nanotubes electro-catalysts were successfully synthesized through alcohol reduction method. The synthesized electro-catalysts were characterized using various physicochemical techniques, revealing the presence of hollow tubular structures with multi-walled carbon nanotubes and palladium-niobium nanoparticles. The electrochemical behavior of these electro-catalysts for alcohol electro-oxidation was investigated, and the palladium-niobium carbon nanotubes demonstrated superior activity and tolerance to poisoning.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Engineering, Environmental
Olabode T. Ajenifujah, Amideddin Nouralishahi, Sarah Carl, Shawn C. Eady, Zhao Jiang, Levi T. Thompson
Summary: Electrocatalysts based on Pt supported early transition metal carbides have shown promise for methanol oxidation reaction (MOR). A study on these electrocatalysts revealed that Pt/NbC exhibited the highest specific activity and a moderate binding energy of H and CO on the electrocatalyst surfaces is favorable for high activity during MOR.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Green & Sustainable Science & Technology
H. Seshagiri Rao, Pernapati Nagaraja, Shuchi Sharma, G. Ranga Rao, Ponniah Justin
Summary: This study investigates the effect of different crystal planes of molybdenum oxide (MoO3) on the efficiency of platinum (Pt) catalysts. The results show that crystal plane-dependent behaviors of MoO3-Pt catalysts influence catalytic activity, stability, and antipoisoning effects. Notably, the Pt-MoO3 catalyst with enhanced crystal growth of MoO3 along the {k00} plane exhibits superior promotion of methanol oxidation and improved antipoisoning performance, making it a promising candidate for efficient and cost-effective fuel cell applications.
MATERIALS TODAY SUSTAINABILITY
(2023)
Article
Energy & Fuels
Qidong Xu, Lingchao Xia, Qijiao He, Zengjia Guo, Meng Ni
Summary: A 2D model was developed to simulate heat and mass transfer processes in methanol-fuelled SOFC, with parametric simulations conducted to investigate the effects of various factors on SOFC performance. The study found that the peak power density of methanol-fuelled SOFC can be high, but the temperature distribution is significantly affected by the working conditions.
Article
Chemistry, Physical
Mohamed Abbas, R. M. Abdel Hameed, Abdullah M. Al-Enizi, Badr M. Thamer, Ayman Yousef, Mohamed H. El-Newehy
Summary: In this study, mixed nickel-manganese carbides were synthesized onto carbon nanofibers, and characterized using SEM, XRD, and FTIR techniques, revealing a homogeneous distribution of nanometallic particles over the CNFs. The NiC-MnC@CNFs nanocatalysts exhibited excellent electrocatalytic behavior towards methanol oxidation, attributed to a synergistic effect between mixed metallic carbides and CNFs leading to improved electrocatalytic properties.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Sebastian Prass, Leon Nerlich, Rajveer Singh, Andres O. Godoy, Jasna Jankovic, K. Andreas Friedrich, Nada Zamel
Summary: A silicon oxide thin film is coated on platinum on graphitized low surface area carbon (Pt/C) to enhance the tolerance of proton exchange membrane fuel cells towards carbon monoxide and hydrogen sulfide contamination. The SiO2 coating improves the performance of SiO2-Pt/C when operated with pure hydrogen fuel, but performs worse than Pt/C when operated with CO-contaminated fuel. The SiO2 coating extends the lifetime of SiO2-Pt/C when operated with H2S in the fuel.
Article
Energy & Fuels
Nagwa G-E. Mohammady, K. M. El-Khatib, M. I. El-Galad, S. A. Abo El-Enin, N. K. Attia, R. El-Araby, Guzine El Diwani, Schonna R. Manning
Summary: The economic feasibility of commercial-scale Nannochloropsis sp. cultivation for biodiesel production and co-products was evaluated. The study showed that under appropriate conditions, high cell growth and productivity were achieved. However, additional high-value co-products are needed to improve the return on investment.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Chemistry, Multidisciplinary
Junnan Song, Ying Chen, Hongjiao Huang, Jiajun Wang, Shao-Chu Huang, Yen-Fa Liao, Amani E. Fetohi, Feng Hu, Han-yi Chen, Linlin Li, Xiaopeng Han, K. M. El-Khatib, Shengjie Peng
Summary: Engineering of structure and composition is crucial for modulating the electrocatalytic activity. In this study, hybrid nanostructured arrays (HNA) with branched and aligned structures were synthesized by hydrothermal-selenization-hybridization strategy. The resulting branched CoSe2@CoNi LDH HNA exhibits enhanced electrocatalytic performance towards oxygen evolution/reduction and hydrogen evolution reaction. The construction of heterostructure effectively lowers the reaction barrier and improves electrical conductivity, favoring the enhanced electrochemical performance. This work provides new guidance for the development of multifunctional electrocatalysts.
Article
Chemistry, Inorganic & Nuclear
Yaoyi Xie, Hanzhi Yu, Liming Deng, R. S. Amin, Deshuang Yu, Amani E. Fetohi, Maxim Yu Maximov, Linlin Li, K. M. El-Khatib, Shengjie Peng
Summary: FeS2 nanoparticles anchored on MXene surface to form FeS2@MXene composite exhibit excellent electrochemical performance in water splitting, showing superior activity and stability.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Chemistry, Physical
Dena Z. Khater, R. S. Amin, Amani E. Fetohi, K. M. El-Khatib, Mohamed Mahmoud
Summary: In this study, manganese oxide-silver nanocomposites anchored on graphitic mesoporous carbon were prepared as cathodic catalysts to improve the ORR kinetics and inhibit biofilm growth on the cathode surface of air-cathode microbial fuel cells fed with sewage. The MnOx-Ag/GMC nanocomposites showed excellent ORR performance and high antibacterial activity, leading to higher maximum power density and lower closed circuit potential decay in MFCs compared to Pt/C cathode-based MFCs.
SUSTAINABLE ENERGY & FUELS
(2022)
Correction
Chemistry, Physical
Dena Z. Khater, R. S. Amin, Amani E. Fetohi, K. M. El-Khatib, Mohamed Mahmoud
SUSTAINABLE ENERGY & FUELS
(2022)
Article
Energy & Fuels
M. El-Galad, K. M. El-Khatib, S. T. El-Sheltawy
Summary: The main objective of this study was to design and simulate three different continuous processes for biodiesel production. An economic assessment and sensitivity analysis were performed, and the results showed that the homogeneous alkali-catalyzed process using THF had the lowest total capital investment and the highest after-tax rate of return. The heterogeneous alkali-catalyzed process using THF had the lowest manufacturing cost and the highest after-tax net profit. The supercritical methanolysis process using THF had the highest manufacturing cost and after-tax net profit.
BIOENERGY RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Yonghan Wang, Feng Hu, Ying Chen, Hui Wang, Amani E. Fetohi, Yanan Hao, Linlin Li, K. M. El-Khatib, Shengjie Peng
Summary: A facile method to prepare Pd nanoparticle ensembles with unique structure and porosity, which are highly active for carbon dioxide reduction, has been reported. The CO selectivity and CO/H-2 ratio can be adjusted by varying the applied potentials.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Electrochemistry
Hanaa M. Sabaa, K. M. El-Khatib, Mohamed Y. El-Kady, Sawsan A. Mahmoud
Summary: In order to promote the sustainability and marketing of microbial fuel cells (MFCs) in wastewater treatment, this study synthesized metal ferrite-based activated carbon composites as low-cost oxygen reduction reaction (ORR) cathode catalysts. The MnFe2O4/AC composite demonstrated the highest catalytic activity and stability, suggesting it as a promising alternative to platinum catalysts for MFCs.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Jin Lin, Huajun Zhou, R. S. Amin, Amani E. Fetohi, K. M. El-Khatib, Chao Wang, Li Guo, Yanzhong Wang
Summary: Nickel sulfide quantum dots@NiFe-terephthalic acid nanosheet (NSQDs@NiFe-TPA) composites were prepared by adjusting the concentration of the sulfurizing agent. The in situ formed NiS/Ni3S2 quantum dots with grain sizes of around 5 nm were evenly dispersed on the surface of NiFe-TPA nanosheets. The as-prepared Ni3S2@NiFe-TPA exhibited excellent HER performance, with an overpotential of only 109 mV to reach a current density of 10 mA cm(-2), and a small attenuation after a 60 h stability test.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Multidisciplinary
R. S. Amin, Amani E. Fetohi, D. Z. Khater, Jin Lin, Yanzhong Wang, Chao Wang, K. M. El-Khatib
Summary: This study explores a simple synthetic method to embed metal selenium nanoparticles on the surface of reduced graphene oxide and a silica template, aiming at improving the efficiency and stability of water splitting reactions. Among them, the NiSe2/rGO-ST composite shows an overpotential of 52.5 mV at 10 mA cm(-2) compared to the benchmark Pt/C E-TEK (29 mV) for the HER. The FeSe2/rGO-ST/NF composite exhibits an overpotential of 297 mV at 50 mA cm(-2) for the OER compared to RuO2/NF (325 mV). After a stability test of 60 hours, all catalysts show negligible deterioration, indicating better stability. The water splitting system composed of NiSe2-rGO-ST/NF||FeSe2-rGO-ST/NF requires only approximately 1.75 V at 10 mA cm(-2), approaching the performance of the noble metal-based Pt/C/NF||RuO2/NF system.
Article
Chemistry, Inorganic & Nuclear
Luqi Wang, Hanzhi Yu, Sheng Zhao, Hui Ma, Linlin Li, Feng Hu, Lei Li, Hui Pan, K. M. El-Khatib, Shengjie Peng
Summary: In this study, Te-doped CoMoO3 supported on a carbon matrix (Te-CoMoO3@C) was synthesized using lattice engineering. The doping of Te effectively modulated the local electronic structures of Co and Mo sites and significantly enhanced the electrochemical performance of the material. The Te-CoMoO3@C exhibited low overpotentials and cell voltage, making it a promising bifunctional electrocatalyst for water splitting.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Biotechnology & Applied Microbiology
Dena Z. Khater, R. S. Amin, M. O. Zhran, Zeinab K. Abd el-Aziz, Mohamed Mahmoud, Helmy M. Hassan, K. M. El-Khatib
Summary: This study demonstrates that the NiO-CuO/G cathode has enhanced electrocatalytic activity toward ORR in a pH-neutral solution. This novel mixed transition metal oxide electrocatalyst could replace expensive Pt-based catalysts for MFC applications.
JOURNAL OF GENETIC ENGINEERING AND BIOTECHNOLOGY
(2022)
