Article
Chemistry, Physical
Dinh Chuong Nguyen, Thi Luu Luyen Doan, Sampath Prabhakaran, Duy Thanh Tran, Do Hwan Kim, Joong Hee Lee, Nam Hoon Kim
Summary: The Co and Nb dual-doping strategy modifies the electronic structure of MoS2, enhancing the efficiency of the Co,Nb-MoS2/TiO2 HSs catalyst for hydrogen evolution, oxygen evolution reaction, and oxygen reduction reaction. The unique hollow spherical structure and synergistic effects between TiO2 core and MoS2 shell provide effective channels for electron transfer and facilitate ion diffusion.
Article
Chemistry, Physical
Hadeer K. El Emam, Abdalla Abdelwahab, S. I. El-Dek, Waleed M. A. El Rouby
Summary: Perovskite oxides, including BaTiO3 and Ni-doped BaTiO3, supported on reduced graphene oxide (rGO), were successfully synthesized as hollow spherical structures using aerosol spray pyrolysis. These nanocomposites exhibited excellent bifunctional electrocatalytic activity for both oxygen reduction and oxygen evolution reactions. The prepared materials were extensively characterized, revealing the high mesoporous features of the hollow spheres. The electrochemical performance of these materials demonstrated remarkable improvements compared to pure BaTiO3 and commercial IrO2 electrocatalysts, making them promising candidates for energy related applications.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Aizhen Que, Taoyu Zhu, Yuying Zheng
Summary: A composite adsorbent of hollow bubble-wrap-like reduced graphene oxide/magnesium silicate (HG@MS) with high efficiency for methylene blue (MB) removal was successfully synthesized using a template and hydrothermal method. The adsorbent showed a large surface area, abundant adsorption sites for MB, maximum adsorption capacity, and recyclability. The adsorption kinetics and isothermal model were also studied, confirming the effectiveness of HG@MS for MB removal.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Xiaoning Tian, Xiaoqiong Hao, Zhongqing Jiang, Qiujie Shen, Baoan Zhang, Jianghua Fang, Yewen Fang, Zhong-Jie Jiang
Summary: In this study, a bifunctional catalyst, Co/CoO/CNx-NGHS, was synthesized to achieve better electrocatalytic performance, higher power density, and close to theoretical capacity at both 100 and 200 mA cm(-2). After cycling for 100 hours, the catalyst demonstrated good durability and stability, showing potential to replace noble metal/carbon-based materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Jing Yang, Yu Fan, Peng-Fei Liu
Summary: The study investigates the application of single-atom Fe-1 catalyst on four graphene-based substrates in water splitting reaction, showing high catalytic activity and efficiency. The hybridization and overlap of Fe single atom 3d orbitals and O atom 2p orbitals on Fe/GS surface are responsible for the strong chemisorption of H2O molecules. Strong metal-support interactions play a crucial role in the water splitting reaction process.
APPLIED SURFACE SCIENCE
(2021)
Review
Energy & Fuels
Nurul Nabila Rosman, Rozan Mohamad Yunus, Nur Rabiatul Adawiyah Mohd Shah, Rosmahani Mohd Shah, Khuzaimah Arifin, Lorna Jeffery Minggu, Norasikin Ahmad Ludin
Summary: Hydrogen generation through photoelectrochemical water splitting is a promising method for addressing energy crises and environmental problems. The introduction of co-catalysts can enhance photocatalytic H-2 generation and overcome issues such as charge carrier recombination and low visible light utilization in metal oxides.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Physical
Hongxia Qian, Zhifeng Liu, Jing Ya, Ying Xin, Jianli Ma, Xiangfeng Wu
Summary: In this study, Co2+ was incorporated into ZnIn2S4 to form a homojunction, promoting carrier separation and transfer efficiency, resulting in significantly higher photocurrent density and charge efficiencies than pure ZnIn2S4.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Xiu-Juan Xie, Ren-Jun Si, Jun Zheng, Kai Wei, Xiu-Ying Zheng, Cheng Chen, Chun-Chang Wang
Summary: ZnO/NiO hollow spheres were successfully prepared with good purity and crystallinity, showing enhanced humidity response compared to pure materials. The sensor achieved a large impedance variation and fast response/recovery time, demonstrating promising potential for advanced humidity sensor applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Shuai Sun, Tianci Wang, Kejiang Qian, Hao Zhang, Kaifeng Ji, Zijian Shi, Mingyu Chen, Cui Zhang, Shuangxi Liu
Summary: In this study, a bifunctional water splitting catalyst CoNiP-V with cation vacancy defects was constructed through defect engineering. The results demonstrate its high activity and stability in the process of water electrolysis.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Nejc Rozman, Peter Nadrah, Renaud Cornut, Bruno Jousselme, Marjan Bele, Goran Drazic, Miran Gaberscek, Spela Kunej, Andrijana Sever Skapin
Summary: The study demonstrates that co-catalysts can enhance the efficiency of TiO2 photocatalysts, especially in the photocatalytic degradation of isopropanol and electrochemical water-splitting reactions. Among them, platinum-containing samples show the best HER activity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Multidisciplinary
Halima Begum, Mohammad Shamsuddin Ahmed, Seunghun Jung
Summary: Efficient bifunctional metal-free carbon catalysts for electrochemical water splitting have been designed by incorporating intramolecular nitrogen reorientation in hollow carbon nanoballs on graphene. The optimized catalyst shows enhanced electrocatalytic activities for both oxygen and hydrogen evolution reactions, mainly due to suitable nitrogen active sites and edge defects with microchannels that facilitate electrolyte penetration and improve stability. Superior conductivity and high surface area of the catalyst also boost electrocatalytic activity by supporting efficient charge transport and rapid mass diffusion with gas release.
ADVANCED MATERIALS INTERFACES
(2021)
Article
Chemistry, Physical
Xingsheng Hu, Qizhao Wang, Yan Li, Yan Meng, Lei Wang, Houde She, Jingwei Huang
Summary: In this work, Mo-doped BiVO4 and Co-Ci prepared by PED were used to enhance the performance of the photoanode, leading to improved photocurrent density and IPCE. The surface hydrophilicity and water oxidation kinetics were successfully improved, providing a new approach for enhancing BiVO4 used for water splitting.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Yanze Wei, Jiawei Wan, Jiangyan Wang, Xing Zhang, Ranbo Yu, Nailiang Yang, Dan Wang
Summary: La- and Rh-co-doped SrTiO3 (STO:La/Rh) hollow multishelled structures have expanded light absorption edge, improved light-harvesting capacity, and charge separation efficiency. When combined with BiVO4 nanosheets, a Z-scheme system enables stable overall water splitting under visible light and simulated sunlight, with a solar-to-hydrogen efficiency twice as high as nanoparticles.
Article
Chemistry, Physical
Chenlu Zhang, Qin Li, Jing Zhao, Rui Liu
Summary: By utilizing the confinement effect of molten sodium chloride, hollow Co/Co3O4 nanoparticles embedded into nitrogen-doped carbon catalyst was successfully prepared. The catalyst exhibited low overpotentials for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), achieving overall water splitting.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)
Article
Engineering, Environmental
Yucong Miao, Jingchao Liu, Lixun Chen, He Sun, Ruikang Zhang, Jian Guo, Mingfei Shao
Summary: In this study, a highly exposed (040) facet BiVO4 photoanode was prepared by a seed assisted hydrothermal method to improve charge transfer. Cobalt single atoms stabilized in N-doped carbon nanosheet were modified on the BiVO4 (040) to enhance water oxidation efficiency. The modified photoanode showed a 2.2 times higher photo-current density and nearly 100% charge injection efficiency compared to pristine BiVO4 (040). The study suggests a promising strategy for fabricating composite photoanodes for solar energy conversion leveraging facet engineering matched with single-atomic-catalyst.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Kholoud E. Salem, Amina A. Saleh, Ghada E. Khedr, Basamat S. Shaheen, Nageh K. Allam
Summary: This study demonstrates an innovative approach to synthesize flower-like trimetallic Mn, Ni, Co phosphide catalysts. The catalysts show outstanding catalytic performance for both HER and OER, as well as excellent durability.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Alhulw H. Alshammari, Majed Alshammari, Khulaif Alshammari, Nageh K. Allam, T. A. Taha
Summary: This paper presents the preparation and study of PVC/PVP/SrTiO3 polymer blend nanocomposites for the first time. The characterization of the polymer films was done using XRD, FTIR, Raman, TGA, and optical spectroscopy techniques. The results showed strong interaction between PVC/PVP polymer blend and SrTiO3, and the addition of SrTiO3 improved the thermal stability and optical properties of the polymer blend. These findings make the PVC/PVP/SrTiO3 polymer blend nanocomposites suitable for opto-electronic applications.
RESULTS IN PHYSICS
(2023)
Article
Biotechnology & Applied Microbiology
Fatma Y. Y. Hassaneen, Rehab Z. Z. Abdallah, Muhammed S. S. Abdallah, Nashaat Ahmed, Shereen M. M. Abd Elaziz, Mohamed A. A. El-Mokhtar, Mohamed S. S. Badary, Rania Siam, Nageh K. K. Allam
Summary: This study investigates the impact of innovative nanoadditives on the microbiome of biodigesters and found that zinc ferrite nanoparticles have the most significant effect on biogas production. The addition of nanoparticles significantly affects the composition of the microbial community, leading to an increase in the abundance of acetate-producing bacteria.
MICROBIAL BIOTECHNOLOGY
(2023)
Article
Chemistry, Analytical
Reham G. Elfarargy, Mahmoud A. Saleh, Mohamed Mahrous Abodouh, Mahmoud A. Hamza, Nageh K. Allam
Summary: We reported the electrochemical determination of methotrexate (MTX) using low-cost, green, and facile one-pot prepared graphitic carbon nitride (g-CN) nanosheets. The g-CN-modified electrode showed a significant enhancement in the electrochemical oxidation and detection abilities of MTX compared to the bare carbon paste electrode (CPE). The proposed material exhibited very low limits of detection and quantification, and a wide linear range, making it suitable for cost-effective MTX detection in industrial and clinical analyses.
Article
Nanoscience & Nanotechnology
Aya M. Mohamed, Doha M. Sayed, Nageh K. Allam
Summary: In this study, bimetallic ZnCo-metal organic framework (MOF) tripods were grown on the surface of NiCo-LDH nanowires, which reduced self-agglomeration and stacking, increased charge transfer sites, and improved ion diffusion. The hybrid ZnCo-MOF@NiCoLDH exhibited a high specific capacitance and enhanced rate capability as a supercapacitor electrode. Additionally, an asymmetric all solid-state supercapacitor device using ZnCo-MOF@NiCoLDH and palm tree derived activated carbon (P-AC) showed high specific energy and excellent Columbic efficiency.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Energy & Fuels
Sara A. Teama, Heba M. El Sharkawy, Nageh K. Allam
Summary: The design and synthesis of innovative materials with specific architecture is crucial for advancing the supercapacitor industry. Transition metal selenides, specifically trimetallic Mn-V-Fe selenide, show great promise as energy storage materials due to their high electronic conductivity and theoretical capacitance. The successful fabrication of MVF-Se through a two-step hydrothermal approach and its thorough characterization provide insights into its composition, structure, and morphology. Electrochemical tests demonstrate the high areal capacitance of the MVF-Se electrode and the desirable energy density and cyclic stability of the assembled supercapacitor device.
Article
Energy & Fuels
Abdussalam M. Elbanna, Kholoud E. Salem, Mohamed Ramadan, Nageh K. Allam
Summary: In this study, a selective method for fabricating optimized nickel-doped brookite nanotube array films was reported. The films were synthesized on a fluorine-doped tin oxide substrate using ultrarapid radio frequency sputtering followed by electrochemical anodization and thermal annealing. Nickel doping improved the photocatalytic performance of the films by introducing impurity bands within the bandgap of titanium dioxide. The annealing process at different temperatures allowed for tuning of the photoactivity of the fabricated photoelectrodes, which was consistent with the nature of the trap states. Additionally, the nanotubes exhibited high crystallinity and enhanced photoresponse with a bandgap of 2.7 eV.
Article
Chemistry, Physical
Samar M. Fawzy, Ghada E. Khedr, Nageh K. Allam
Summary: Density functional theory was used to investigate the effect of Te-Ti doping on TiO2. Te doping resulted in band gap narrowing and the formation of mid-gap states, reducing the birefringence of TiO2 in the UV region. Te-Ti combined with native oxygen vacancies and hydrogen interstitials showed potential as catalysts for photo-electrochemical water-splitting. The catalytic activity for oxygen evolution reaction was highest in Te-Ti + O-v material, while for hydrogen evolution reaction, Te-Ti + H-i material performed the best.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Y. I. Mesbah, N. Ahmed, M. M. Hasan, N. K. Allam
Summary: Lithium-ion batteries (LIBs) are important energy storage devices, but their disposal poses waste and environmental hazards. This study successfully extracted mesoporous Li-Ni-Mn-Co oxide nanoparticles from spent LIBs using a simple method and used them to construct functional supercapacitors. However, the as-extracted oxides had poor stability and conductivity, so carbon additive (C76) was used to enhance their properties and form Li-Ni-Mn-Co oxide/C76 nanocomposites.
MATERIALS TODAY CHEMISTRY
(2023)
Review
Nanoscience & Nanotechnology
Loujain G. Ghanem, Manar M. Taha, Basamat S. Shaheen, Nageh K. Allam
Summary: A novel Ni-Co phosphate nanoplatelet-based hybrid system was designed via a coprecipitation method at ambient conditions. The nanoplatelets exhibited exceptional charge storage capabilities, enhanced photoactive storage performance, and high energy and power densities when integrated with commercial activated carbon. This research opens up possibilities for the design of various supercapattery devices.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Ahmed M. Agour, Esraa Elkersh, Ghada E. Khedr, Hisham G. El-Aqapa, Nageh K. Allam
Summary: In this study, a well-dispersed iron single-atom catalyst immobilized on nitrogen-doped carbon nanosheets was used for efficient electrochemical N2 fixation. The catalyst exhibited high activity and stability under ambient conditions and provided a comprehensive understanding of the catalytic mechanisms involved.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Physical
Heba M. El Sharkawy, Abdussalam M. Elbanna, Ghada E. Khedr, Nageh K. Allam
Summary: This study successfully fabricates Cu-Mn mixed-metallic oxysulfides as supercapacitor electrodes and demonstrates excellent electrochemical performance, providing new insights for the design and fabrication of low-cost, earth-abundant electrode materials.
Article
Electrochemistry
Heba M. El Sharkawy, Aya M. Mohamed, Nageh K. Allam
Summary: In this study, V2O5@MnO2 nanocomposites were efficiently synthesized and their properties were characterized. The nanocomposite exhibited excellent performance as a negative electrode in supercapacitor devices, with high specific capacitance and outstanding operating voltage range.
ELECTROCHIMICA ACTA
(2023)
