Article
Chemistry, Physical
Jifang Zhang, Qiyuan Lin, Zhenlei Wang, Haowen Liu, Xuanzhang Li, Yuegang Zhang
Summary: The study proposes that water oxidation on hematite can proceed via mixed reaction paths, contrary to the traditional assumption of a single reaction path. By isolating absorption signals of surface states responsible for water oxidation, the research highlights the significant contribution of direct hole transfer, especially for highly doped hematite. This finding challenges existing experimental techniques that rely on oversimplified models and theories.
Article
Nanoscience & Nanotechnology
Jhon Puerres, Sergio Polania, Andrees F. Perez-Torres, Eider A. Erazo, Maria T. Cortis, Pablo Ortiz
Summary: The study focuses on the formation of composite materials with carbon nanodots (CNDs) and electrochemical reduction of metal oxide semiconductors to enhance the performance of photoelectrochemical water oxidation. The results demonstrate that electrochemical reduction increases electron lifetime, reduces charge-transport resistance, and improves water oxidation kinetics in TiO2. Furthermore, the incorporation of CNDs enhances electron-hole pair separation and decreases charge-transfer resistance. Combining both strategies results in a significant increase in TiO2 photocurrent, showing their importance in photoelectrochemical systems.
ACS APPLIED NANO MATERIALS
(2023)
Article
Biophysics
Yang Zang, Rong Cao, Chenyang Zhang, Qin Xu, Zhanjun Yang, Huaiguo Xue, Yizhong Shen
Summary: The novel photoelectrochemical immunosensor effectively monitored CEA by utilizing TiO2 NPs and DS-ZnCdS hollow nanospheres for improved photoelectric conversion efficiency, along with HCR-mediated signal cascade for enhanced detection sensitivity. The immunosensor demonstrated a desirable linear range, low detection limit, excellent selectivity, stability, and feasibility in early clinical diagnosis, making it a promising tool for CEA detection.
BIOSENSORS & BIOELECTRONICS
(2021)
Article
Materials Science, Composites
Mengqiu Xu, Fuchun Xu, Kaili Zhu, Xudong Xu, Ping Deng, Wenbo Wu, Wei Ye, Zhongti Sun, Peng Gao
Summary: The use of ALD technique on silicon nanowires has enhanced the production rate and efficiency of ammonia, achieving the conversion of nitrate to ammonia successfully.
COMPOSITES COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Weicong Li, Narayanamoorthy Bhuvanendran, Huiyuan Liu, Qian Xu, Khadijeh Hooshyari, Huaneng Su
Summary: In this work, ternary PtPdCo mesoporous nanospheres (MNs) were developed as an efficient electrocatalyst for methanol oxidation reaction (MOR). The physicochemical characterizations showed that PtPdCo MNs possessed abundant mesoporous channels, nanospheres assembly of tiny nanparticles, and strong interatomic interaction and synergistic effect. Electrochemical tests revealed superior MOR catalytic performance and durability of PtPdCo MNs compared to benchmark catalysts. This study represents a novel approach to reducing Pt costs while achieving high MOR performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Marcus Einert, Arslan Waheed, Dominik C. Moritz, Stefan Lauterbach, Anna Kundmann, Sahar Daemi, Helmut Schlaad, Frank E. Osterloh, Jan P. Hofmann
Summary: Metal oxide-based photoelectrodes use nanostructures to increase solid-liquid interface area, reducing charge transport distances and increasing photocurrent. However, the effect of surface order on photocurrent and carrier recombination has not been well studied. Mesoporous CuFe2O4 (CFO) thin film photoanodes with controlled pore order and geometry were prepared. The non-ordered CFO showed the highest photocurrent density for sulfite oxidation but the least for water oxidation, while the ordered CFO showed the best photoelectrochemical water oxidation performance.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Physical
Prabhakarn Arunachalam, Mabrook S. Amer, Haneen A. AlOraij, Abdullah M. Al-Mayouf, Mahmoud Hezam, Matar Al-Shalwi
Summary: This study presents a facile approach to fabricate a composite electrode of titanium dioxide nanotubes decorated with silver phosphate nanoparticles. The fabricated electrode showed significantly enhanced photocurrent response and efficiency.
Article
Chemistry, Physical
Xiaokang Wan, Yunbo Xu, Xianyun Wang, Xiangjiu Guan, Yanming Fu, Chao Hu, Haowei Hu, Nai Rong
Summary: Plasma enhanced atomic layer deposition and subsequent removal of Al2O3 ultrathin overlayers on bismuth vanadate were utilized to passivate surface states and enhance PEC performance significantly. The modified BiVO4 showed a 73% increase in photocurrent density compared to unmodified BiVO4, demonstrating a novel strategy for surface modification of semiconductors in photoelectrochemical energy conversion.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Ceramics
Shirin Khanmohammadi, Mehdi Ojaghi-Ilkhchi, Morteza Farrokhi-Rad
Summary: The electrophoretic deposition of bioglass coatings reinforced with hydroxyapatite whiskers on anodized titanium substrates showed enhanced adhesion strength for fine bioglass particles, with no effect on microhardness and bioactivity. The introduction of titania nanotubes during anodizing process improved the bactericidal effect and cellular behavior of the coatings, while also reducing corrosion current density compared to bare titanium.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Environmental
Yichun Lou, Dong Qiu, Shengpeng Chen, Haoyu Chen, Linrui Wang, Zixiang Hao, Chengli He, Yang Chen, Xiaoli Cui
Summary: In this study, a Bi2MoO6/TiO2 heterojunction was constructed to broaden light absorption and accelerate oxidation kinetics, leading to highly effective water splitting. The Bi2MoO6/TiO2 heterojunction exhibited significantly higher photocurrent density and better electron transfer properties compared to pristine TiO2, promoting the separation of electron-hole pairs. This work provides a novel strategy for TiO2-based heterojunction with great potential for photoelectrochemical water splitting applications.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Applied
Wenjia Xue, Feng Cheng, Menglu Li, Wenjian Hu, Congping Wu, Bing Wang, Kuowei Liao, ZhenTao Yu, Yingfang Yao, Wenjun Luo, Zhigang Zou
Summary: The study presents Fe3N@NG as an efficient OER electrocatalyst, where the NG nanoshells enhance electron transfer from Fe3N to NG, improving catalytic efficiency and stability.
JOURNAL OF ENERGY CHEMISTRY
(2021)
Article
Electrochemistry
Fumiaki Amano, Shimpei Nomura, Chihiro Tateishi, Satoshi Nakayama
Summary: TiO2 nanotube (TNT) photoanodes demonstrate effective oxygen evolution reaction (OER) in photoelectrochemical water oxidation. This study reveals that beta-PbO2 nanoparticles are selectively deposited on the catalytic site of the upper part of the TNT array with a length of around 1 μm, resulting in photocurrent decay. The deposition of PbO2 nanoparticles on both inner and outer surfaces of the tube walls is consistent with the charge separation mechanism at the space charge layers. The position of the OER site varies with the incident light wavelength due to the change in light penetration depth.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Martin Motola, Raul Zazpe, Ludek Hromadko, Jan Prikryl, Veronika Cicmancova, Jhonatan Rodriguez-Pereira, Hanna Sopha, Jan M. Macak
Summary: A reconstruction process of TiO2 nanotube (TNT) layers was conducted to enhance their photoelectrochemical performance and photocatalytic activity. By preparing double-wall (DW) TNT layers, etching the inner wall to obtain single-wall (SW) TNT layers, and coating with TiO2 coatings of different thicknesses, significant improvements were achieved in incident photon-to-electron conversion efficiency and photocatalytic performance compared to untreated TNT layers.
APPLIED SURFACE SCIENCE
(2021)
Article
Multidisciplinary Sciences
Yunqing Kang, Ovidiu Cretu, Jun Kikkawa, Koji Kimoto, Hiroki Nara, Asep Sugih Nugraha, Hiroki Kawamoto, Miharu Eguchi, Ting Liao, Ziqi Sun, Toru Asahi, Yusuke Yamauchi
Summary: In this study, core-shell PtPdRhRuCu mesoporous nanospheres (PtPdRhRuCu MMNs) were synthesized using a one-pot wet-chemical reduction approach with a diblock copolymer as the soft template. The PtPdRhRuCu MMNs showed adjustable compositions and exposed porous structures rich in highly entropic alloy sites. Electrochemical characterization revealed robust electrocatalytic hydrogen evolution reaction (HER) activities of the PtPdRhRuCu MMNs in alkaline, acidic, and neutral electrolytes.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Praveen Lavudya, Harita Pant, Vadali V. S. S. Srikanth, Rajanikanth Ammanabrolu
Summary: An easy microwave-assisted hydrothermal method is used to prepare mesoporous and phase pure anatase TiO2 nanospheres in this research. The ATNS exhibits a high specific surface area, high N2 adsorption capacity, and shows a photodegradation efficiency of methylene blue dye as high as 98%.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Mohamed A. Ghanem, Ibrahim S. El-Hallag, Ahmed R. Tartour, Elsayed H. El-Mossalamy, Nouf H. Alotaibi
Summary: The electrochemistry of catechol in HClO4 was investigated using cyclic voltammetry, convolution-deconvolution voltammetry, and digital simulation methods. Two possible mechanisms for the electro-oxidation of catechol were proposed and evaluated.
JOURNAL OF THE IRANIAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Jahangeer Ahmad, Tansir Ahamad, Norah Alhokbany, M. A. Majeed Khan, Prabhakarn Arunachalam, Mabrook S. Amer, Rahaf M. Alotaibi, Saad M. Alshehri
Summary: In this study, reduced graphene oxide encapsulated perovskite-type lanthanum cobalt oxide nanoparticles (LaCoO3@rGO) were synthesized as highly efficient electro-catalysts for electrochemical oxygen evolution and reduction reactions. The LaCoO3@rGO nanocomposites showed improved performance in oxygen evolution reaction with lower over-potential and Tafel slopes compared to pure LaCoO3 catalyst. The electrochemical oxygen reduction reaction showed better 4e-system behavior for LaCoO3@rGO catalyst at all potentials.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Etab M. Almutairi, Mohamed A. Ghanem, Abdulrahman Al-Warthan, Mufsir Kuniyil, Syed F. Adil
Summary: This study presents the synthesis of ultrathin copper oxide nanosheets (CuO-NS) using a versatile foam-surfactant dual template (FSDT) approach and demonstrates their electro-oxidation and sensing performance for hydrazine. The CuO-NS were prepared by chemical deposition of dissolved copper ions in a hexagonal surfactant template using hydrogen foam generated by a reducing agent. The CuO-NS exhibited superior oxidation performance compared to bare-CuO, with a high hydrazine sensitivity, low detection limit and a linear concentration range. Additionally, CuO-NS showed potential for practical hydrazine detection in water samples with good recovery, and the FSDT approach can be used to synthesize a wide range of nanomaterials for boosting electrochemical catalytic reactions.
Article
Materials Science, Multidisciplinary
Aneeqa Masood, Hajra Hanif, Shahid M. Ramay, Mahmood Ul Hassan, Sultan Akhtar, A. R. Rehman, Asif Mahmood, Syed Mansoor Ali, Abubaker A. Siddig, Mabrook Saleh Amer, Naushad Ahmad, Aamir Razaq
Summary: Flexible paper-based energy storage electrodes were fabricated by using cerium oxide and cerium oxide-manganese oxide nanoparticles synthesized via co-precipitation synthesis technique, and lignocellulose fibers extracted from Monochoria Vaginalis plant as binder. Structural and optical properties were analyzed by XRD and FTIR. The fabricated CeO2/LC and Ce0.98 Mn0.02O2/LC composite sheets exhibited promising electrochemical performances.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Multidisciplinary
Mabrook S. Amer, Prabhakarn Arunachalam, Mohamed A. Ghanem, Abdullah M. Al-Mayouf, Mark T. Weller
Summary: Photoelectrochemical (PEC) solar water splitting using semiconductor electrodes is a promising method for converting solar energy into hydrogen fuel. In this study, strontium titanium oxynitride (STON) with anion vacancies was prepared via solid phase synthesis and used as a photoelectrode for alkaline water oxidation. The PEC efficiency was improved by depositing a cobalt-phosphate (CoPi)-based co-catalyst on the surface of the STON electrode. The enhanced oxygen evolution kinetics and reduced surface recombination of photogenerated carriers contribute to the observed PEC enrichment. Additionally, the CoPi modification of perovskite-type oxynitrides presents a new avenue for developing efficient and stable photoanodes in solar-assisted water-splitting reactions.
Article
Materials Science, Multidisciplinary
Raghad K. Aljurays, Aicha Loucif, Mabrook S. Amer, Abdullah M. AlMayouf
Summary: In this study, LaMO3 (M = Fe, Cr, Mn) perovskite thin films were fabricated and characterized using electrophoretic deposition (EPD) on FTO substrates. The films exhibited different crystal structures and morphologies, with LaMnO3 film showing the highest transparency. The bandgaps and refractive indices of the films were determined, providing insights into the optical properties. This study is of significant importance as it contributes to the fabrication and understanding of perovskite thin films, paving the way for potential applications in optoelectronic devices.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Environmental Sciences
Mabrook S. Amer, Prabhakarn Arunachalam, Abdullah M. Al-Mayouf, Ahmad A. Alsaleh, Zeyad A. Almutairi
Summary: A low-cost electrode material is developed for electrocatalytic water and urea oxidation reactions, which are crucial for generating hydrogen. This material exhibits high efficiency and durability in oxygen evolution reaction (OER) and urea oxidation reaction (UOR).
ENVIRONMENTAL RESEARCH
(2023)
Article
Chemistry, Physical
Aya Fathy, Ashour M. Ahmed, Mohamed A. Ghanem, Hany Hamdy, Mohamed Shaban, Khaled M. H. Mohammed, Mohamed Rabia
Summary: Poly(m-toluidine) (PmT) is used as a high-performance electrode material in a supercapacitor with a PmT/(Co-Ni) core/shell composite as the electrode. The Co-Ni nanoneedles are prepared via a hydrothermal process and PmT nanoplatelets are grown on them through in-situ oxidation polymerization. The PmT/(Co-Ni) electrode exhibits a high specific capacitance of 308F/g at a current density of 0.6 A/g, as well as good stability with 98% retention of its initial capacitance after thousand cycles. The unique nanoplatelets/nanoneedles architecture and conductive PmT polymer contribute to the excellent electrochemical performance of the electrode.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Biochemistry & Molecular Biology
Naaser A. Y. Abduh, Abdullah A. Al-Kahtani, Mabrook S. Amer, Tahani Saad Algarni, Abdel-Basit Al-Odayni
Summary: The aim of this study was to fabricate a new heterogeneous catalyst for the conversion of cyclic ethers to lactones using a solvent-free method and O2 as an oxidant. The ZF@gamma-Al2O3 catalyst exhibited improved oxidation activity towards cyclic ethers compared to the unsupported catalyst and showed good stability and catalytic activity even after multiple cycles.
Article
Chemistry, Multidisciplinary
Weaam A. Al-Sulmi, Mohamed A. Ghanem, Saba A. Aladeemy, Abdullah M. Al-Mayouf, Nouf H. Alotaibi
Summary: This study demonstrates a simple and novel approach to synthesize mesoporous nickel phosphate nanoparticles (meso-NiPO) via chemical deposition from a surfactant liquid crystal template. The meso-NiPO exhibits superior activity for urea oxidation reaction in alkaline solution, with high specific surface area and long-term stability. The method of chemical deposition from a surfactant liquid crystal template has the advantages of feasible synthesis of a wide range of nanomaterials for electrochemical energy production and storage systems.
ARABIAN JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Mohamed Zayed, Mohamed A. Ghanem, Mariam Taha, Hussein A. Elsayed, Ahmed Mehaney, Mohamed Shaban, Khaled M. H. Mohammed, Ashour M. Ahmed
Summary: This study investigates the performance of ZnO nanorods doped with Fe, Al, and Sn for hydrogen photo-production. The Fe-ZnO film exhibits the lowest energy band gap and the best photoelectrode performance.
JOURNAL OF SAUDI CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Saleh Omar ben Gubaer, Maged N. Shaddad, Prabhakarn Arunachalam, Mabrook S. Amer, Saba A. Aladeemy, Abdullah M. Al-Mayouf
Summary: The present work demonstrates the synergistic effect of Co-doping and vacuum-annealing on the electrochemical redox reactions of iron oxide films. Through a hydrothermal approach, a series of defect-rich iron oxy/hydroxide nanorod arrays were synthesized and cobalt doping was employed to enhance the electrocatalytic OER activity of the thin film catalysts. The results show that the as-deposited Co-doped FeOx NR catalyst exhibits significantly improved OER performance compared to the as-deposited Co-doped FeOOH NR catalysts, indicating the importance of Co doping and the defect-rich nature of FeOx nanorod catalysts in sustainable energy systems.
