Article
Chemistry, Physical
Nouha Mediouni, Frederic Dappozze, Lhoussain Khrouz, Stephane Parola, Abdesslem Ben Haj Amara, Hafsia Ben Rhaiem, Nicole Jaffrezic-Renault, Philippe Namour, Chantal Guillard
Summary: This study investigated the generation of hydrogen peroxide on commercial and synthesized ZnO from different precursors using model molecules and phenolic intermediates. The results showed that the improved efficiency of ZnO photocatalysis is related to the production of H2O2, the reduction of oxygen vacancies, and the similar number of moles of H2O2 formed per number of carbon atoms removed.
Review
Chemistry, Multidisciplinary
Ashish Kumar, Venkata Krishnan
Summary: Surface modification and defect engineering are effective methods to improve the photocatalytic performance of materials. Defect engineering can tune the optical, charge separation, and surface properties of materials, aiding in the adsorption of reactants.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Biochemistry & Molecular Biology
Farid Orudzhev, Arsen Muslimov, Daud Selimov, Rashid R. Gulakhmedov, Alexander Lavrikov, Vladimir Kanevsky, Rashid Gasimov, Valeriya Krasnova, Dinara Sobola
Summary: This paper reports on the high photocatalytic activity of ZnO tetrapods (ZnO-Ts) under visible/solar light and hydrodynamic water flow. It was demonstrated that surface oxygen defects play a crucial role in the photocatalytic activity of ZnO-Ts. The ability to control the surface wettability and surface defect concentration of ZnO-Ts was also shown. Additionally, the similar photocatalytic activity of ZnO-Ts under direct and simulated sunlight offers great potential for solar photocatalysis.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Engineering, Environmental
Tao Chen, Fangpei Ma, Zhe Chen, Menglin Xie, Ting Li, Yu Zhou, Jun Wang
Summary: A facile microwave assisted strategy was reported for defect engineering of two-dimensional tungsten oxide, promoting the photochemical and O-2 activation behaviors. The catalyst achieved a high phenol yield with high selectivity under visible-light-driven conditions.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Micah S. Haseman, Hantian Gao, Kalpak Duddella, Leonard J. Brillson
Summary: We measured the movement of intrinsic point defects in ZnO nano- and micro-wires driven by electric fields and observed their impact on the electrical properties of the wires. The results explain the instability in nanowire transport and demonstrate a new method for refining and processing ZnO nanowires. These findings highlight the importance of in-operando intrinsic point-defect migration during nanoscale electric field measurements.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Bismark Sarkodie, Yanjie Hu, Wei Bi, Jiechao Jiang, Chunzhong Li
Summary: Tailoring the configuration at metal and support interface can effectively enhance the catalytic performance of Cu/ZnO catalyst for CO oxidation. The incorporation of active Cu+ species in CuxO-Cu/ZnO catalyst significantly reduces the activation energy and improves the oxygen mobility and vacancies, leading to enhanced catalytic activity. The critical role of active Cu+ sites in CuxO-Cu/ZnO was further confirmed by In-situ DRIFTS.
APPLIED SURFACE SCIENCE
(2021)
Review
Materials Science, Multidisciplinary
Zaiba Zafar, Sha-Sha Yi, Jin-Peng Li, Chuan-Qi Li, Yong-Fa Zhu, Amir Zada, Wei-Jing Yao, Zhong-Yi Liu, Xin-Zheng Yue
Summary: This review discusses the impact of defect architecture on photocatalytic activity and emphasizes the importance of defect engineering in the design of modern photocatalysts. By tuning the electronic microstructure and surface morphologies of semiconductors, efficiency of photocatalysts can be improved.
ENERGY & ENVIRONMENTAL MATERIALS
(2022)
Article
Chemistry, Physical
Huizhong Ma, Baofei Hao, Wentao Song, Jinpeng Guo, Mingyuan Li, Lan Zhang
Summary: The TiO2/ZnO heterojunction thin films combined with surface oxygen vacancies prepared through magnetron sputtering showed enhanced photocatalytic performance in degrading organic pollutants in water. By controlling the O-2/Ar ratio, the morphology, thickness, chemical composition, and crystal structure of the films can be regulated to improve photocatalytic efficiency. The heterojunction thin film exhibited superior photocatalytic properties due to the heterojunction interface and surface oxygen vacancies, accelerating the separation of electron-hole pairs.
Article
Chemistry, Multidisciplinary
Fatemah. H. Alkallas, Amira Ben Gouider Trabelsi, Ramzi Nasser, Susana Fernandez, Ji-Ming Song, Habib Elhouichet
Summary: Chromium-doped zinc oxide nanorods were prepared and their structural, morphological, and optical properties were studied. The doped nanorods showed efficient photocatalytic degradation of methyl orange under UV-vis light illumination.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Inorganic & Nuclear
M. R. Alfaro Cruz, Leticia M. Torres -Martinez
Summary: A SnO2-ZnO photocatalyst was prepared through successive ionic layer adsorption and reaction (SILAR) and sputtering methods. The annealed films showed the presence of tetragonal SnO2 and hexagonal ZnO phases. The nonhomogeneous surface of the films had spherical particles, with agglomeration occurring during ZnO deposition. The defects in ZnO and SnO2 allowed for hydrogen production and redox reactions, contributing to the stability of the films.
SOLID STATE SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
Yaqing Zhi, Yuan Yi, Chenxi Deng, Qiao Zhang, Siyuan Yang, Feng Peng
Summary: Introducing defect engineering into ZnO/ZnS heterojunction photocatalysts is an effective method to improve their visible light performance and photocatalytic efficiency. In this study, a defect-enriched ZnO/ZnS photocatalyst was synthesized through a hydrozincite intermediate-deriving reaction. The defect states endowed visible light response ability to both ZnO and ZnS components, leading to high photocatalytic activity and stability.
Article
Energy & Fuels
Junxiang Xiang, Tingshi Zhang, Ruodan Cao, Mingxiong Lin, Bixia Yang, Yonglin Wen, Zanyong Zhuang, Yan Yu
Summary: The concentration of oxygen vacancies directly affects the efficiency and selectivity of the NiO catalysts in the photocatalytic CO2 reduction reaction. Moderate oxygen vacancies enable strong CO2 binding and efficient charge transfer, while excessive vacancies reduce CO2 binding affinity and hinder charge mobility, leading to decreased performance in the reaction.
Article
Materials Science, Multidisciplinary
Zhouzheng Jin, Jingru Li, Yiming Zhang, Dan Liu, Hui Ding, Bhekie B. Mamba, Alex T. Kuvarega, Jianzhou Gui
Summary: Simultaneously integrating heterogeneous interface, element doping, and metal decorating is an effective strategy for enhancing visible-light-driven photocatalytic activity. In this study, a facile solvothermal route was employed to synthesize Ni-doped BiOBr/Bi-0 with ZnO 3D hierarchical heterojunction (Z@B/Bi-Ni). The optimized Z@B/Bi-Ni photocatalysts exhibited remarkable catalytic performance, outperforming other photocatalysts, towards the degradation of tetracycline solution under visible light. The enhanced photocatalytic mechanism was attributed to the unique morphologies, surface plasmonic resonance effect, and Ni doping in Z@B/Bi-Ni, which were elucidated by a series of experiments, characterization, and DFT calculations. This research provides new insights for the design of hierarchical heterojunction photocatalysts.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Menglong Wang, Keying Xue, Kai Zhang, Lingxia Li
Summary: The effect of Nb2O5 doping on the crystal structure, micromorphology, and dielectric properties of BaTiO3-2 mol% MnYbO3-2 mol% CaZrO3-x mol Nb2O5 ceramics was studied. It was found that the optimal dielectric properties were obtained at x = 0.5 mol%, with high permittivity, low dielectric loss, and large insulation resistivity. The analysis indicated that the increased permittivity was due to enhanced short-range hopping polarization triggered by the formation of defect dipoles and the release of oxygen vacancies.
CERAMICS INTERNATIONAL
(2022)
Article
Energy & Fuels
Amar K. Salih, Matthew R. Phillips, Cuong Ton-That
Summary: This study presents a simple method to produce highly efficient ZnO photoanodes for solar-driven water splitting. The fabrication process involves post-growth oxidation of a metallic Zn layer, resulting in a nanostructured ZnO film with a high concentration of surface oxygen vacancies. The ZnO photoanodes exhibit exceptional photocurrent density due to the ionized VO defects, making it one of the best-performing ZnO-based photoelectrodes reported so far. This research demonstrates a promising approach for large-scale production of efficient ZnO-based photoanodes.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Article
Chemistry, Multidisciplinary
Ruizhi Li, Jie Liang, Tingshuai Li, Luchao Yue, Qian Liu, Yonglan Luo, Mohamed S. Hamdy, Yibai Sun, Xuping Sun
Summary: The increasing energy demand and environmental issues have attracted global attention, calling for the development of sustainable technologies. Molybdenum disulfide (MoS2) has been identified as a promising material for catalyzing key electrochemical reactions, with excellent performances. This review provides insights into the structure, synthesis strategies, recent advances, challenges, and perspectives of MoS2-based electrocatalysts for the hydrogen evolution reaction, nitrogen reduction reaction, and carbon dioxide reduction reaction.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Jie Chen, Qiang Zhou, Luchao Yue, Donglin Zhao, Longcheng Zhang, Yongsong Luo, Qian Liu, Na Li, Abdulmohsen Ali Alshehri, Mohamed S. Hamdy, Feng Gong, Xuping Sun
Summary: Electrocatalytic nitrate reduction to produce ammonia is an attractive method for environmental mitigation. This study introduces a highly active Co-NCNT nanohybrid catalyst for efficient ammonia synthesis in alkaline solution, demonstrating excellent electrochemical stability.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Hisham S. M. Abd-Rabboh, Khaled F. Fawy, Mohamed S. Hamdy, SeragEldin I. Elbehairi, Ali A. Shati, Mohammad Y. Alfaifi, Hala A. Ibrahium, Saad Alamri, Nasser S. Awwad
Summary: This study focuses on the production of bio-based silica, lignocellulose, and activated carbon from rice biomass waste. The products were characterized using various physical examination techniques and preliminarily used in wastewater treatment and water desalination processes.
Article
Materials Science, Multidisciplinary
Zerong Li, Jie Liang, Qian Liu, Lisi Xie, Longcheng Zhang, Yuchun Ren, Luchao Yue, Na Li, Bo Tang, Abdulmohsen Ali Alshehri, Mohamed S. Hamdy, Yonglan Luo, Qingquan Kong, Xuping Sun
Summary: In the electrochemical reduction process of NO3-, using ZnCo2O4 nanosheet array supported on carbon cloth (ZnCo2O4 NSA/CC) as a catalyst allows for highly selective conversion of NO3- to NH3. This catalyst exhibits excellent electrochemical performance and durability in alkaline solution.
MATERIALS TODAY PHYSICS
(2022)
Article
Polymer Science
Afaf Y. Khormi, Mohamed Abboud, Mohamed S. Hamdy, Murad Eissa, Mohamed R. Shaaban
Summary: The paper describes the synthesis of a novel nano-sized phosphine-free benzothiazole-based palladium(II) complexes and their efficiency as catalysts for Suzuki Miyaura cross coupling reaction using water as a solvent under microwaves irradiations. The catalytic activity of the novel nanocatalysts for SMC of aryl halides with arylboronic acids using water as a solvent and under microwaves irradiation conditions was investigated.
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
(2023)
Article
Environmental Sciences
Qin Yang, Yingchun Yang, Yujie Zhang, Longcheng Zhang, Shengjun Sun, Kai Dong, Yongsong Luo, Junyou Wu, Xiaowen Kang, Qian Liu, Mohamed S. Hamdy, Xuping Sun
Summary: The cobalt nanoparticles decorated biomass Juncus derived carbon (Co@JDC) was used to activate peroxymonosulfate (PMS) for efficient removal of ofloxacin (OFX) in water. The Co@JDC/PMS system showed excellent performance with 97% OFX degradation efficiency and 70.4% chemical oxygen demand removal rate achieved within 24 minutes. The system exhibited broad pH tolerance and was unaffected by Cl-, NO3-, and SO(4)2-. SO4-, ·OH, O2-, and O1(2-) were identified as the main active species in the PMS activation process.
Article
Chemistry, Physical
Amal A. Atran, Fatma A. Ibrahim, Nasser S. Awwad, Mohd Shkir, Mohamed S. Hamdy
Summary: A one-step synthesis method was used to prepare porous sponge-like ceria (CeO2). The solid material was characterized and found to have a three-dimensional pore system. The porous ceria exhibited higher photocatalytic activity compared to the commercial sample in both liquid and gas phase reactions. Furthermore, the porous ceria showed low deactivation after multiple runs.
Article
Physics, Multidisciplinary
Basmah H. Alshammari, Ubaid-ur-Rehman Ghori, Qasim Ali Ranjha, Sohail Ahmad, Waseem Abbas, Sana Ullah Asif, Fahim Ahmed, Fatma A. Ibrahim, Mohamed S. Hamdy, Sayed M. Eldin
Summary: The hexagonal ferrites, Ba0.9Sm0.1Fe10Al2O19, were synthesized using the conventional solid state reaction method. The effects of different sintering temperatures on the magnetic and structural properties of Barium hexa ferrites were analyzed. XRD confirmed a pure hexagonal structure with no impurity peaks. SEM analysis showed a homogeneous distribution of particles. Magnetic measurements revealed a saturation magnetization value of 48.55 emu g(-1) and coercivity of 5.01 KOe for the sample sintered at 1220 degrees C. With increasing sintering temperature, the saturation magnetization decreased to 46.24 emu g(-1) and the coercivity increased to 5.26 KOe at 1270 degrees C.
Article
Physics, Multidisciplinary
Sana Ullah Asif, Qasim Ali Ranjha, Ubaid-ur-Rehman Ghori, Basmah H. Alshammari, Fahim Ahmed, Usman Nawaz, Fatma A. Ibrahim, Mohamed S. Hamdy
Summary: The effect of sintering temperature on the structural and magnetic properties of BaFe9.95Al2Mg0.05O19 M-type hexagonal Ba-hexaferrites was investigated. The results showed that as the sintering temperature increased, the saturation magnetization and remanence ratio initially increased, then decreased at higher temperatures, while the coercivity and magnetocrystalline anisotropy field decreased first, then increased. The optimal magnetic properties were achieved at a pre-sintering temperature of 1280 degrees C.
Article
Green & Sustainable Science & Technology
Mohamed Abboud, Reem S. S. Alnefaie, Asla A. A. AL-Zahrani, Nabil Al-Zaqri, Mohammad Abu Haija, Azza Al-Ghamdi, Mabkhoot Alsaiari, Mohammed Jalalah, Omeer Albormani, Mohamed S. S. Hamdy
Summary: A simple and efficient method was reported to prepare highly efficient and reusable NiO@SBA-15 nanocatalysts for cyclohexane oxidation. The nanocatalysts showed high dispersion of NiO NPs in SBA-15 and exhibited the highest catalytic activity with meta-Chloroperoxybenzoic acid as the oxidant. Compared to other catalysts, NiO@SBA-15 achieved a conversion rate of 75-99% for cyclohexane. The catalytic activity was maintained during five successive cycles.
Article
Chemistry, Physical
Afaf Y. Khormi, Badria M. Al-Shehri, Fatimah A. M. Al-Zahrani, Mohamed S. Hamdy, Amr Fouda, Mohamed R. Shaaban
Summary: In this study, Pd nanoparticles were successfully synthesized and supported on mesoporous silica by doping technique. The as-synthesized sample showed an average size of 10-20 nm with an irregular shape. The synthesized sample exhibited high catalytic activity in the reduction of nitroarenes to aromatic amines, and the heterogeneous Pd-SiO2 catalyst showed reusability for four repeated cycles with over 88% efficiency.
Article
Chemistry, Physical
Basmah H. Alshammari, Humayra Begum, Fatma A. Ibrahim, Mohamed S. Hamdy, Tahamida A. Oyshi, Nazia Khatun, Mohammad A. Hasnat
Summary: In this study, a noble metal-decorated electrode was used to successfully convert acetic acid into hydrogen gas, showing excellent catalytic performance at a lower potential. This result is of great significance for solving the sustainable production of clean hydrogen.
Article
Engineering, Electrical & Electronic
Amal A. Atran, Fatma A. Ibrahim, Nasser S. Awwad, Hisham S. M. Abd-Rabboh, Mohamed S. Hamdy
Summary: Porous ceria nanoparticles doped with nickel ions were successfully synthesized using a quick and easy auto combustion method. The synthesized materials were characterized by various techniques, and it was found that the incorporation of nickel ions into the ceria framework increased the surface area. Moreover, the nickel-doped samples exhibited a red shift in light absorption and showed significantly improved photocatalytic activity compared to bare ceria.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Biochemistry & Molecular Biology
Xiya Yang, Xun He, Lang He, Jie Chen, Longcheng Zhang, Qian Liu, Zhengwei Cai, Chaoxin Yang, Shengjun Sun, Dongdong Zheng, Asmaa Farouk, Mohamed S. S. Hamdy, Zhaogang Ren, Xuping Sun
Summary: In this study, we developed a CuO nanowire array on Cu foam decorated with CoFe-LDH nanosheet (CuO@CoFe-LDH/CF) for efficient seawater oxidation. The CuO@CoFe-LDH/CF electrode exhibited excellent electrocatalytic activity for oxygen evolution reaction, requiring a low overpotential of 336 mV to achieve a high current density of 100 mA cm(-2) in alkaline seawater. Moreover, it demonstrated good stability with continuous operation for at least 50 hours without significant activity attenuation.
Article
Chemistry, Multidisciplinary
Jun Li, Donglin Zhao, Longcheng Zhang, Luchao Yue, Yongsong Luo, Qian Liu, Na Li, Abdulmohsen Ali Alshehri, Mohamed S. Hamdy, Quan Li, Xuping Sun
Summary: A bimetallic FeCo2O4 spinel nanowire array grown on carbon cloth is proposed as an efficient electrocatalyst for the conversion of NO3- to NH3, with high faradaic efficiency and large NH3 yield. It also exhibits excellent stability during electrolysis.
CHEMICAL COMMUNICATIONS
(2022)
