Article
Materials Science, Ceramics
Nur Hawa Nabilah Azman, Yusran Sulaiman
Summary: This research presents a new supercapattery technology with a positive electrode composed of porous functionalized carbon nanofibers (pfCNFs), poly(3,4-ethylenedioxythiophene) (PEDOT), and cobalt oxide (Co3O4). The composite exhibits a flower-like structure and demonstrates high specific capacity and cycling stability, showing great potential as an electrode for supercapattery.
CERAMICS INTERNATIONAL
(2022)
Article
Energy & Fuels
G. Surender, Fatin Saiha Omar, Shahid Bashir, M. Pershaanaa, S. Ramesh, K. Ramesh
Summary: Renewable energy requires efficient storage devices for balancing electricity demand and supply. In this study, a cobalt sulfide electrode modified with different metals, such as manganese and copper, demonstrated enhanced performance in terms of specific capacitance and cycling stability. Among the electrodes tested, Mn-CoS-3/NF exhibited the best rate capability and capacitance retention, attributed to its unique nanostructure and low internal resistance.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Nanoscience & Nanotechnology
Jay Singh, Priyanka Yadav, Rajamani Nagarajan, Jaekook Kim, Alok Kumar Rai
Summary: In this work, titanium (Ti4+) doping was optimized in CoMoO4 nanorod anode material to improve its intrinsic behavior for lithium-ion battery applications. Among the different doping concentrations, 20 wt % Ti-doping showed the best performance in terms of reversible capacity, cycling stability, and rate capability. Ti4+ doping introduced additional electrons and vacancies in the CoMoO4 crystal lattice, leading to enhanced electronic conductivity and diffusion rate of Li+ ions. The 20 wt % Ti-doped CoMoO4 anode exhibited superior electrochemical performance due to the optimum doping concentration and synergistic effect of TiO2 nanoparticles.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Physical
Rundong Wang, Feng Li, Jing Ji, Feng Wang
Summary: By fabricating Co3O4 nanotube on Co foil and preparing hydrangea-like CoMoO4 on anodic cobalt oxide matrix, the optimized catalyst shows excellent hydrogen evolution reaction (HER) activity with only 78 mV overpotential at -10 mA/cm2 in alkaline solution. The electrode also exhibits good stability during long-term reaction, showing promising potential in hydrogen production via water splitting.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Nadja Klipfel, Agustin O. Alvarez, Hiroyuki Kanda, Albertus Adrian Sutanto, Cansu Igci, Cristina Roldan-Carmona, Cristina Momblona, Francisco Fabregat-Santiago, Mohammad Khaja Nazeeruddin
Summary: In this study, we highlight the importance of C-60 and compact-TiO2 as electron transport layers in the performance of coevaporated n-i-p perovskite solar cells. We demonstrate that there is a synergistic effect between these layers in charge extraction and optimization of the C-60 layer is crucial for enhancing device performance. Moreover, we find that excessively thick C-60 layers can introduce additional charge transport resistance and hinder the fabrication of highly efficient perovskite solar cells.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Energy & Fuels
Muhammad Waqas Iqbal, Mian Muhammad Faisal, Haseeb ul Hassan, Amir Muhammad Afzal, Sikandar Aftab, Tausaif Zahid, Abaid Ur Rehman
Summary: This study synthesized silver sulfide, cobalt sulfide, and their binary compound silver cobalt sulfide using a simple hydrothermal approach. The electrochemical analysis showed that the specific capacity of silver cobalt sulfide was higher when compared to silver sulfide or cobalt sulfide alone. An asymmetric supercapacitor with activated carbon as the negative electrode and silver cobalt sulfide as the positive electrode achieved high energy density and power density.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
Faiz Alam, Muhammad Zahir Iqbal, Shahid Alam, Najam Alhassan
Summary: This study focuses on enhancing the electrochemical performance of cobalt phosphate (Co-3(PO4)(2)) using polyaniline (PANI) for high performance hybrid energy storage devices. The developed binary composites exhibit exceptional energy storage performance and cyclic stability potential, showing great potential for applications in high-performance energy storage technologies.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Materials Science, Multidisciplinary
Seyedeh Forough Mirseyed, Kourosh Jafarzadeh, Auref Rostamian, Amir Semnani, Hadis Mazhari Abbasi, Mehdi Ostadhassan
Summary: This study investigates the effect of iridium and titanium oxide on the deactivation mechanisms of a typical Ti/(36RuO(2)-xIrO(2)-(64-x)TiO2) composite material. The results show that the composition Ti/(36RuO(2)-38IrO(2)-26TiO(2)) provides a nanostructured morphology, maximum lifetime and optimum electrocatalytic activity. This composition improves the bonding of the coating components, delays pitting corrosion, and enhances the durability of the coating.
Article
Materials Science, Ceramics
N. A. Zhuk, N. A. Sekushin, D. V. Sivkov, A. V. Popov
Summary: Co-doped CaCu3Ti4O12 samples were synthesized by solid-phase reaction. Electrical properties of the samples were studied in wide temperature and frequency ranges. The presence of the copper oxide interlayer reduced the dielectric constant. The amount of impurity copper increased with the cobalt content. The samples had a granular microstructure and exhibited low- and high-frequency polarization. The best values of dielectric permittivity and dielectric loss tangent were observed in the CaCu3Ti3.94Co0.06O12- delta sample.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Longbiao Yu, Rui Zhang, Ruixin Jia, Wenhao Jiang, Xiaoyu Dong, Xuehua Liu, Haijie Cao, Binghui Xu
Summary: This study synthesized nanosized cobalt monoxide anode material and nanosized lithium cobalt oxide cathode material using few-layered graphene oxide and metallic cobalt foils through a hydrothermal reaction. Both the CoO@RGO anode and the LCO cathode exhibited impressive lithium-ion storage properties.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Electrochemistry
Mayank K. Singh, Sarathkumar Krishnan, Dhirendra K. Rai
Summary: Flexible energy storage materials with high flexibility and mechanical stability are in high demand for wearable electronics. 2D MXenes are well-established electrode materials due to their excellent conductivity, large specific surface area, and ion intercalation properties. This work reports on a fabric-based flexible electrode material using Ti3C2Tx MXene and CoS, which shows enhanced supercapattery features compared to individual components. The fabricated flexible symmetrical device using Ti3C2Tx/CoS@CC electrode demonstrates high energy density and power density, with excellent electrochemical performance under mechanical stress. These findings open new possibilities for designing efficient electrode materials for flexible electronic devices.
ELECTROCHIMICA ACTA
(2023)
Article
Materials Science, Multidisciplinary
Mehmood Shahid, Arshid Numan, Jayesh Cherusseri, Mohammad Khalid, H. H. Somaily, Chariya Kaewsaneha
Summary: In this study, a one-step method was developed to synthesize Co(OH)2 nanoflakes intercalated into nitrogen-doped graphene oxide (NrGO). The NrGO-Co(OH)2 nanocomposite showed promising electrochemical performances and potential for energy storage devices. The specific capacity of the NRCO nanocomposite electrode reached 75.2 C/g, and the supercapattery device fabricated with NRCO nanocomposite exhibited excellent cycle life with 93.1% retention of its initial capacity after 3000 continuous charge/discharge cycles.
JOURNAL OF MATERIALS RESEARCH
(2023)
Article
Chemistry, Physical
Fara M. Aris, M. Pershaanaa, Surender Gunalan, Shahid Bashir, Fatin Saiha Omar, Norshahirah M. Saidi, K. Ramesh, S. Ramesh
Summary: Supercapattery is an emerging alternative energy storage technology, and cobalt phosphate (Co3(PO4)2) is a promising electrode material due to its abundance, low cost, valence states variation, and good faradaic property. To improve its electrochemical performance, Co3(PO4)2 was synthesized via sonochemical method, calcined at different temperatures, and coated with cobalt hydroxide (Co(OH)2) layer. The optimized sample showed fascinating electrochemical performance and outstanding cyclic stability over 15,000 charge/discharge cycles.
Article
Chemistry, Physical
Priyadharshini Matheswaran, Pandi Karuppiah, Pazhanivel Thangavelu
Summary: Research on supercapattery is on the rise due to its excellent efficiency in power and energy density. A simple method of alpha phase Co2P2O7 synthesis was reported, with improved electrochemical performance attributed to the augmented redox sites and short diffusion pathways of nanoparticles.
Article
Materials Science, Ceramics
Ninad B. Velhal, Tae Ho Yun, Junhyuck Ahn, Taewook Kim, Jisoo Kim, Changyong Yim
Summary: Different micro- and nanostructures of cobalt oxide are grown on Ni foam using surface-modifying agents via a simple one-pot hydrothermal synthesis process. The electrochemical measurements demonstrate that the dandelion flower-like morphology obtained via CTAB delivers the highest specific capacitance. The surface modification of Co3O4 material improved the charge storage performance of the electrodes for supercapacitor applications.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
John D. Rodney, S. Deepapriya, M. Cyril Robinson, C. Justin Raj, Suresh Perumal, Byung Chul Kim, S. Jerome Das
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Chemistry, Multidisciplinary
Seungil Park, Chellan Justin Raj, Ramu Manikandan, Byung Chul Kim, Kook Hyun Yu
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
(2020)
Article
Electrochemistry
Murugesan Rajesh, Ramu Manikandan, Byung Chul Kim, Matthieu Becuwe, Kook Hyun Yu, C. Justin Raj
ELECTROCHIMICA ACTA
(2020)
Article
Energy & Fuels
Periyasamy Sivakumar, Milan Jana, Puritut Nakhanivej, Min Gyu Jung, Chellam Justin Raj, Ho Seok Park
Summary: One-dimensional nanostructures are attractive for energy storage electrodes due to their large surface area, efficient transport pathway, structural stability, and exposed electrochemically active sites. Bimetallic single crystalline nickel cobalt carbonate hydroxide nanowires exhibit high specific capacitance and cycling stability, making them promising for hybrid supercapacitor electrodes. This unique electrode material shows significantly improved performance compared to monometallic counterparts, with high rate capabilities and energy densities.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Energy & Fuels
Periyasamy Sivakumar, Chellan Justin Raj, David Odhiambo Opar, JeongWon Park, Hyun Jung
Summary: The synthesis of layered NCO nanosheets using a solvothermal reaction, specifically with a 1:2 (DMF:water) ratio of solvent, leads to controlled growth of 2D nanosheets with excellent surface texture and high specific capacitance. The resulting NCO1 shows battery type charge storage properties with a maximum specific capacitance of 731 F g(-1), outperforming NCO2 and NCO3. Furthermore, a hybrid supercapacitor utilizing NCO1 as the positive electrode demonstrates excellent stability and specific energy and power performance through 20,000 cycles of testing.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Energy & Fuels
Periyasamy Sivakumar, C. Justin Raj, JeongWon Park, Hyun Jung
Summary: The study demonstrates the facile design and fabrication of oxygen-vacant NiMoO4 hollow sphere electrode materials through a simple hydrothermal approach and subsequent heat treatment under an argon atmosphere. The introduction of oxygen vacancies enhances electrical conductivity, improves charge-storage capability, and results in higher specific capacity and energy density in hybrid supercapacitors.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Energy & Fuels
Periyasamy Sivakumar, Dhanasekaran Vikraman, C. Justin Raj, Sajjad Hussain, JeongWon Park, Hyun-Seok Kim, Hyun Jung
Summary: The study focuses on fabricating NiCo/NiO/NiCo2O4 composite materials with abundant active edges and improved electrical conductivity. The NC1 composite demonstrated excellent electrocatalytic activity and supercapacitor performance, as well as outstanding energy density and stability in a dual-electrode device.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Energy & Fuels
Periyasamy Sivakumar, Min Gyu Jung, C. Justin Raj, Ho Seok Park
Summary: Constructing hierarchically structured porous electroactive materials, such as ternary nickel cobalt molybdenum oxide (NCMO), shows great potential for high-performance hybrid supercapacitors (HSCs). The NCMO electrode exhibits larger specific capacitance compared to other metal oxide electrodes, and optimizing the mass ratio of NCMO//AC HSCs can lead to high energy and power densities with excellent capacitance retention over cycles.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Chemistry, Physical
C. Justin Raj, Ramu Manikandan, Pugalenthiyar Thondaiman, Periyasamy Sivakumar, A. Dennyson Savariraj, Won-Je Cho, Byung Chul Kim, Hyun Jung
Summary: Graphene synthesized via electrochemical exfoliation of graphite is a simple, fast, and scalable technique suitable for supercapacitor electrodes. Pulse sonication assisted electrochemical exfoliation significantly enhances the process, with the nature of electrolyte and intercalation ions playing a crucial role in the quality and performance of graphene. The presence of various defect sites on the surface and edges of graphene exfoliated in acidic and neutral electrolytes contributes to improved electrochemical performance.
Article
Materials Science, Ceramics
Periyasamy Sivakumar, C. Justin Raj, JeongWon Park, Hyun Jung
Summary: Developing efficient electrode materials is crucial for improving high-performance hybrid supercapacitors. In this study, oxygen deficient flower-like three-dimensional NiMoO4-delta (O-d-NMO) nanomaterial is synthesized and demonstrated to have better supercapacitive performances due to the presence of oxygen defect sites.
CERAMICS INTERNATIONAL
(2022)
Article
Energy & Fuels
Periyasamy Sivakumar, C. Justin Raj, Loganathan Kulandaivel, JeongWon Park, Hyun Jung
Summary: Introducing oxygen defects into the well-ordered three-dimensional flower-like CoMoO4 nanoarchitecture through defect engineering can significantly enhance its electrochemical properties, making it suitable for high-performance energy storage systems.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Review
Engineering, Electrical & Electronic
S. Grace Infantiya, A. Aslinjensipriya, R. Sylvia Reena, S. Deepapriya, John D. Rodney, S. Jerome Das, C. Justin Raj
Summary: The discovery of innovative multifunctional ceramics, particularly perovskite oxide ceramics such as calcium copper titanate (CCTO), has significant implications for various industries. This article systematically reviews the advancements in CCTO ceramics, including their structural morphology, synthesis techniques, doping mechanisms, and effects on dielectric and electrical properties. The study provides an overview and motivation for future research in the fabrication of CCTO or other electro-ceramics.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Physical
Pugalenthiyar Thondaiman, Chellan Justin Raj, Rajavel Velayutham, Antonysamy Dennyson Savariraj, Ramu Manikandan, Voz Cristobal, Byung Chul Kim
Summary: The functionalization of structural nanoengineered battery-type electrodes has facilitated the emergence of the supercapattery (SCp) subclass, enabling a wide range of applications. Our research presents a promising approach to obtaining high-performance battery-type electrodes through the two-step fabrication of nanoengineered 3D-on-2D structures.
MATERIALS TODAY ENERGY
(2022)
Review
Chemistry, Multidisciplinary
Antonysamy Dennyson Savariraj, Chellan Justin Raj, Amol Marotrao Kale, Byung Chul Kim
Summary: Metal-organic frameworks and their derivatives have shown great potential as electrocatalysts for supercapacitors due to their unique structure, customizable functionalities, and tunable pore sizes. By eliminating insulating binders and using in situ grown MOFs, the electrochemical performance of supercapacitors can be significantly improved. This review provides a comprehensive summary of different metal-ligand combinations, preparation techniques, modification strategies, properties, and charge transport mechanisms of MOFs as freestanding electrode materials, as well as highlighting the potential promises, challenges, and state-of-the-art advancements in the rational design of electrodes for energy storage applications.
Article
Electrochemistry
Antonysamy Dennyson Savariraj, Ramu Manikandan, C. Justin Raj, Rajavel Velayutham, R. Mangalaraja, Jinsoo Park, Won-Je Cho, Byung Chul Kim
Summary: The interlayer spacing of bismuth selenide can be expanded by intercalating phosphorus atoms, resulting in improved surface plasmon resonance, carrier density, and ion diffusion, leading to superior performance in energy storage applications. This strategy can also be applied to other research on bismuth selenide.
BATTERIES & SUPERCAPS
(2022)
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)