Article
Engineering, Chemical
Zihang Peng, Minhua Ai, Songbo Wang, Dechao Kong, Chengxiang Shi, Ji-Jun Zou, Ruijie Gao, Lun Pan
Summary: The construction of p-n heterojunction using p-ZnO quantum dots decorated on oxygen-defective TiO2 nanorods promoted the charge separation and improved the photoelectrochemical performance.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Electrochemistry
Eftade Pinar Gur, Mesut Eryig, Uemit Demir
Summary: In this study, vertically aligned ZnO nanowalls decorated with electrochemically reduced graphene oxide (ERGO) structures were co-deposited directly on FTO substrates using a simple and one-pot electrochemical technique. These ERGO/ZnONWs were then co-sensitized with PbS and CdS quantum dots (QDs) using a successive ionic layer adsorption and reaction (SILAR) technique to fabricate ERGO/ZnONWs/PbS/CdS photoelectrodes. The photocurrent response of the ERGO/ZnONWs photoelectrodes was systematically investigated by varying the number of SILAR cycles for PbS and CdS. The PbS/CdS co-sensitized ERGO/ZnONWs photoelectrodes exhibited the best performance with high efficiency, open-circuit voltage, short-circuit current, and fill factor compared to other reported ZnO-based QDSSCs. The present study highlights the potential of the novel ERGO/ZnONWs/PbS/CdS photoanode and provides a simple and eco-friendly electrochemical technique for researchers interested in fabricating ERGO/ZnONWs for various applications.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Physical
Chunqing Ji, Wenjing Wang, El-Sayed M. El-Sayed, Guoliang Liu, Yanan Si, Kongzhao Su, Zhanfeng Ju, Fan Wu, Daqiang Yuan
Summary: Platinum complexes have been widely used as catalysts for hydrogen production from water due to their high work function and redox potential. The functionalized Zr-Bpydc-PtCl2 MOCs show good stability and high photocatalytic efficiency in producing H-2, indicating the promising approach of integrating catalyst molecules into MOCs for improving the efficiency of water hydrogen production.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Engineering, Electrical & Electronic
Libo Yu, Zhen Li
Summary: Researchers have developed a hierarchical microstructure for photoanode materials in dye sensitized solar cells (DSSC). The materials demonstrate enhanced light scattering, increased specific area, reduced charges recombination, and improved power conversion efficiency.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Chemistry, Physical
Dong-Jin Yun, Hyemin Ra, Jung-Min Kim, Seongho Jeon, Sung Hoon Park, Minsu Seol, Seunghyup Lee
Summary: ZnO nanorod arrays offer high surface area, but face challenges in charge collecting efficiency. This study synthesizes patterned ZnO nanorod arrays using a hydrothermal method and deposits an Ru metal layer using radio frequency sputtering, revealing the combination of Ru metal and ZnO nanorod arrays as a lower cost alternative with great potential.
APPLIED SURFACE SCIENCE
(2021)
Article
Engineering, Electrical & Electronic
Jogendra Singh Rana, Santanu Das, Satyabrata Jit
Summary: A PTB7-decorated ZnO nanorod-based MSM ammonia sensor was demonstrated in this study, showing a high response rate to 20 ppm ammonia gas at room temperature, and still maintaining a certain response rate at a low concentration of 2 ppm. The device also exhibited fast response and recovery times.
IEEE SENSORS JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
S. Athithya, S. Harish, H. Ikeda, M. Navaneethan, J. Archana
Summary: In this study, a new scheme consisting of ZnO nanospindles decorated on TiO2 mesospheres as a stable photoanode was reported, and the kinetics of photon-induced charge carrier migration/transfer were explored. Different proportions of ZnO spindles decorated on mesosphere TiO2 were synthesized and used as photoanodes in DSSCs. The DSSC device with the TZC-0.05 photoanode showed excellent photovoltaic performance and long-term stability, with the best response exhibited at 35 degrees Celsius.
Article
Electrochemistry
Yuyu Liu, Zi Wang, Linjie Li, Shufang Gao, Dingshan Zheng, Xiangxiang Yu, Qingfeng Wu, Qin Yang, Desheng Zhu, Wenxing Yang, Yan Xiong
Summary: This paper presents the fabrication of a novel photoanode based on a semiconductor composite and tests its performance in QDSSCs. The experimental results show that the new photoanode exhibits better charge transfer and reaction rates, as well as higher photocurrents and power conversion efficiencies. After interface modification, the cell efficiency is further improved.
ELECTROCHIMICA ACTA
(2022)
Article
Engineering, Electrical & Electronic
Aysh Y. Madkhli, G. Souadi, Sunanda Kakroo
Summary: In this study, carbon dots with excellent optical properties were synthesized using Allamanda cathartica flowers through a solvothermal process. These carbon dots were employed as co-sensitizers in a dye-sensitized solar cell, resulting in a significant efficiency improvement.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Sia Won, Jong-Sung Kim
Summary: This study demonstrated that the photocatalytic efficiency of ZnO can be significantly improved by doping carbon dots onto its surface, leading to effective degradation of dyes in wastewater.
SCIENCE OF ADVANCED MATERIALS
(2021)
Article
Chemistry, Applied
Xiaoyu Zhao, Meifeng Wang, Zhiwang Cai, Daoyu Xia, Lei Zhao, Qingwei Song, Yiru Qin, Wei Wei
Summary: By optimizing the Yb3+ doping concentration and particle size, and selecting suitable organic dye sensitizers, the performance of dye-sensitized UCNPs can be maximized, with dye sensitization proving to be more favorable for smaller-sized UCNPs.
Article
Energy & Fuels
Guanda Zhou, Ting Zhao, Oumin Wang, Xin Xia, Jia Hong Pan
Summary: By adjusting the concentration of the Ti precursor and reaction time during hydrothermal process, the density and diameter of rutile TiO2 nanorod arrays vertically aligned on conductive fluorine-doped tin oxide glass can be optimized for photocatalysis. Quantum dots of V2VI3 (V = Bi; VI = Se, Te) are then used as sensitizers to enhance the visible-light response of TiO2, leading to increased photocurrent, improved light harvesting properties, and enhanced charge carrier separation capability.
JOURNAL OF PHYSICS-ENERGY
(2021)
Article
Nanoscience & Nanotechnology
Partha Kumbhakar, Rushikesh S. Ambekar, Arko Parui, Ajit K. Roy, Debmalya Roy, Abhishek K. Singh, Chandra S. Tiwary
Summary: This work demonstrates the electrical-mechanical coupling phenomena by decorating piezoresponsive atomically thin ZnO nanosheets on a polymer surface using additive manufacturing technology. The output voltage response of the 3D-printed architecture can be regulated by external mechanical pressures. Energy generation is achieved by placing the 3D-printed fabric on a padded shoulder strap, utilizing the mechanical strength and flexibility of the coated structure. The improved charge transfer at the interface enhances the output performance of the 3D-printed fabric.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Muhammad Sufyan, Umer Mehmood, Yasir Qayyum Gill, Rabia Nazar, Anwar Ul Haq Khan
Summary: In this study, ZnO nanorods were synthesized via the hydrothermal method and characterized by SEM and XRD. The results show that hydrothermal temperature affects the morphology of nanorods, which in turn influences the photovoltaic performance of devices. The device fabricated with ZnO nanorods photoanode synthesized at 120 degrees C achieved an efficiency of 2.08%, surpassing conventional ZnO nanoparticles-based DSSC with an efficiency of 1.19%.
Article
Chemistry, Physical
Malihe Golshan, Shahriar Osfouri, Reza Azin, Tahmineh Jalali, Navid R. Moheimani
Summary: Co-sensitization of natural dyes extracted from Malva verticillata and Syzygium cumini was found to be effective in enhancing dye-sensitized solar cell performance by achieving panchromatic light-harvesting. The combination of these studied dyes exhibited high molar extinction coefficient and cumulative absorption properties, with potential applications in improving the overall efficiency of DSSCs.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2021)
Article
Chemistry, Physical
Biswanath Das, Esteban Alejandro Toledo-Carrillo, Lin Li, Fei Ye, Jianhong Chen, Adam Slabon, Oscar Verho, Lars Eriksson, Mats Gothelid, Joydeep Dutta, Bjorn Akermark
Summary: The electrocatalytic activity of a cobalt-containing, water-soluble molecular water oxidation catalyst was reported, and its stability and activity were significantly enhanced by anchoring it onto modified carbon cloth.
Article
Engineering, Environmental
Rola Mohammad Al Soubaihi, Khaled Mohammad Saoud, Joydeep Dutta
Summary: This study reports on the low-temperature carbon monoxide (CO) oxidation using a silver/silica aerogel (Ag/SiO2 AG) catalyst. The catalyst was prepared via a sol-gel synthesis followed by supercritical ethanol drying, resulting in a highly stable and sinterproof catalyst with easy reactant diffusion. The Ag/SiO2 AG catalyst exhibited enhanced catalytic activity due to the prevention of silver nanoparticles agglomeration and the facilitation of well-dispersed active sites, leading to improved mass heat transfer. The catalyst's pretreatment conditions played a crucial role in achieving high CO conversion efficiency at low light-off temperatures, and the active sites responsible for the enhanced catalytic behavior were identified as Ag0.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Electrochemistry
Xingyan Zhang, Maria Isabel Alvarado-Avila, You Liu, Dongkun Yu, Fei Ye, Joydeep Dutta
Summary: This study presents a simple growth strategy to obtain hierarchical P(Ni, Co, Fe) modified electrodes by phosphating a core/shell composite of nickel-cobalt (NiCo) Prussian blue analogues. The hybrid electrode exhibits high specific capacitance, excellent rate capability, and improved cycling stability. Furthermore, it shows excellent performance in the oxygen evolution reaction and overall water splitting.
ELECTROCHIMICA ACTA
(2023)
Article
Electrochemistry
Johan Nordstrand, Esteban Toledo-Carrillo, Joydeep Dutta
Summary: Capacitive deionization (CDI) is a promising technique for purifying water by eliminating ions. Recent experiments have shown a natural imbalance in anion/cation adsorption even for solutions containing only sodium and chloride, and suggested a connection with Faradaic leakages. This study presents a new circuit model that considers leakages, separately accounts for leakages on both electrodes, and incorporates different leakage resistances. The model allows analysis and quantification of the influence of leakage resistance and other material properties on adsorption imbalance. Based on these findings, a multi-electrode (ME) device design is proposed to tune or eliminate the adsorption imbalance by distributing voltage across the electrodes appropriately.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Johan Nordstrand, Lea Zuili, Joydeep Dutta
Summary: Electrochemical deionization devices, such as capacitive deionization (CDI), are essential for global freshwater requirements, particularly for desalination of brackish water. The current study extends an electrolytic capacitor (ELC) model to improve stability and efficiency of CDI systems. The newly implemented strategies and theoretical extensions allow for the first fully coupled and spatiotemporal three-dimensional (3D) CDI model. The study investigates a flow-through CDI device structure and finds that asymmetric designs may still perform reasonably well in normal operating conditions.
Article
Thermodynamics
Wujun Wang, Fei Ye, Joydeep Dutta, Bjorn Laumert
Summary: Spectral hemispherical emissivity is a critical property for radiation heat transfer in high-temperature solar thermal applications. This study systematically investigates the photothermal performances and stability of oxidized surfaces of three commonly used chromia-forming alloys. The results indicate the potential of these alloys, especially SS 253MA, for solar-thermal applications.
APPLIED THERMAL ENGINEERING
(2023)
Article
Biochemistry & Molecular Biology
Santosh Kumar, Jyotismita Konwar, Manashi Das Purkayastha, Sweety Kalita, Avik Mukherjee, Joydeep Dutta
Summary: Food processing waste and by-products can be utilized for manufacturing high-value products, such as pectin extraction from citrus fruit peel and fruit pomace. Conventional extraction methods using acid, alkali, and chelating agents have been used extensively, but advanced extraction technologies like enzyme, microwave, and supercritical water extraction are preferred due to their energy efficiency and high-quality product. This review compares the efficiency, quality, and functionality of different extraction techniques.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Biochemistry & Molecular Biology
Dongkun Yu, Indra Bhusan Basumatary, Santosh Kumar, Fei Ye, Joydeep Dutta
Summary: Benzophenone-3 grafted chitosan (CS-BP-3) was synthesized and used as an antibacterial coating for the first time. The grafting mechanism, chemical structure, and thermal stability of CS-BP-3 were studied. The CS-BP-3 coating demonstrated UV blocking property, surface features, optical and thermal stability, and antibacterial activity against both Gram-negative and Gram-positive bacteria, making it potentially applicable in food packaging.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Engineering, Chemical
Johan Nordstrand, Joydeep Dutta
Summary: Intercalation host compounds (IHC) are potential candidates for selective ion removal from water. Recent theoretical developments suggest that electrochemical desalination using Nickel Hexacyanoferrate (NiHCF) electrodes could achieve a separation factor of 160 between K+ and Na+ ions, although the experiments have only shown a selectivity of around 3. This study investigates the reasons behind time-dependent selectivity suppression through theoretical derivation and a finite-element model. The findings reveal the importance of ion starvation and the surprising discovery that operating at low state-of-charge can increase selectivity to a theoretical value of 600, surpassing the previously assumed maximum. By implementing specific charging cycles, the time-dependent selectivity has been significantly improved from 3 to 450, and further enhancements can be achieved by combining IHC cathodes with membrane-less carbon anodes.
Article
Electrochemistry
Johan Nordstrand, Joydeep Dutta
Summary: In this study, a flow-through bipolar CDI design is presented, which significantly improves salt adsorption rate and ion transport compared to previous designs. The removal of internal compartments lowers resistance, resulting in advantages that outweigh the potential energy cost.
ELECTROCHIMICA ACTA
(2023)
Editorial Material
Environmental Sciences
George Triantafyllou, George Triantaphyllidis, Annika Pollani, Jun She, Joydeep Dutta, Michael St. John, Marco Faimali, Roy Brouwer, Pavel Stoev
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Multidisciplinary Sciences
Rola Mohammad Al Soubaihi, Khaled Mohammad Saoud, Ahmed Awadallah-F, Ahmed Mohamed Elkhatat, Shaheen A. Al-Muhtaseb, Joydeep Dutta
Summary: The oxidation of CO to CO2 via molecular rearrangements induced by catalytic metal atoms with oxygen intermediates is extensively studied in heterogeneous catalysis. This reaction is essential for reducing greenhouse gas emissions, particularly in low-temperature CO oxidation in vehicle catalytic converters. The catalytic activity of the palladium-supported silica aerogel (Pd/SiO2) catalyst was enhanced after the first cycle, attributed to the reconditioning of its pores. The presence of oxide forms of palladium in the SiO2 structure influenced the catalyst's performance by increasing the frequency of active sites. Additionally, the adsorption of CO2 onto Pd/SiO2 was evaluated, and the Langmuir model was employed to study the equilibrium adsorption behavior. Overall, the mesoporous Pd/SiO2 aerogel shows promise as a material for CO removal and CO2 capture at low temperatures.
Article
Chemistry, Physical
Biswanath Das, Esteban A. Toledo-Carrillo, Guoqi Li, Jonas Stahle, Thomas Thersleff, Jianhong Chen, Lin Li, Fei Ye, Adam Slabon, Mats Gothelid, Tsu-Chien Weng, Jodie A. Yuwono, Priyank V. Kumar, Oscar Verho, Markus D. Karkas, Joydeep Dutta, Bjorn Akermark
Summary: In this study, a bifunctional and electrochemically regenerable molecular electrode was successfully developed for the stable production of hydrogen. By anchoring a highly active ruthenium electrocatalyst onto modified fluorine-doped carbon cloth, the electrode exhibited high activity for both oxygen evolution reaction and hydrogen evolution reaction in acidic conditions. The electrode design showed excellent electrochemical regeneration performance after prolonged use.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Maria Isabel Alvarado-Avila, Stefano De Luca, Ulrica Edlund, Fei Ye, Joydeep Dutta
Summary: This study proposes a sustainable method for hydrogen production using sunlight and cellulose as sacrificial agents during the photocatalytic water splitting process. The concentration of cellulose, pH of the system, and Pt loading were found to be important parameters affecting hydrogen production efficiency. The presence of specific molecular elements such as hemicellulose and xyloglucan significantly increased the hydrogen production rate. Carboxymethylation and TEMPO-oxidation of cellulosic biomass resulted in more stable suspensions with higher rates of hydrogen production. The results suggest that cellulosic biomass can be an attractive alternative for the photocatalytic splitting of water for hydrogen production.
SUSTAINABLE ENERGY & FUELS
(2023)
Article
Chemistry, Applied
Dongkun Yu, Indra Bhusan Basumatary, You Liu, Xingyan Zhang, Santosh Kumar, Fei Ye, Joydeep Dutta
Summary: This study reports a method to enhance the antimicrobial properties of chitosan coating by loading photocatalyst ZnO-SnOx nanoparticles onto chitosan matrix. The results show that ZnO-SnOx has a better inhibitory effect on bacteria compared to chitosan alone, making the chitosan nanocomposite coating a potential material for food packaging.
PROGRESS IN ORGANIC COATINGS
(2024)