Article
Materials Science, Ceramics
Shannon E. Murray, Yu-Ying Lin, Soumitra S. Sulekar, Mebatsion S. Gebre, Nicola H. Perry, Daniel P. Shoemaker
Summary: Reactive flash sintering is an effective method for densifying and synthesizing ceramic materials, but the predictive capability of the BBR model for phase transformations during the process is limited. CuO reduction and Mn(2)O(3) reduction demonstrate the challenges of predicting phase transformations due to local, stochastic current flow and localized heating. Understanding and engineering the complex thermal profile that results from these sources of inhomogeneity can be beneficial for optimizing reaction kinetics.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Aref Omri, E. Dhahri, B. F. O. Costa, M. A. Valente
Summary: A systematic study of the structural, electrical, and dielectric properties of NiFeCoO4 nanoparticles synthesized via sol-gel technique has been presented in this article. The analysis includes X-ray diffraction, Raman spectroscopy, dielectric measurements, and complex impedance analysis. The electrical properties and dielectric parameters show significant dependence on temperature and frequency, with one semicircular arc in complex impedance plots representing grains and grain boundaries contributions.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2021)
Article
Crystallography
Jesus Israel Barraza-Fierro, Edgar Lopez-Martinez, Octavio Vazquez-Gomez, Monica Galicia-Garcia, Hector Cruz-Mejia, Julio C. Villalobos
Summary: The corrosion behavior of copper and copper-functionalized boron nitride nanocomposites (Cu-BNNS) in a 3.5 wt.% NaCl solution was investigated. Different stages of corrosion behavior were distinguished using polarization curves and cyclic voltammetry experiments. Electrochemical impedance spectroscopy (EIS) was utilized to understand the stages of the degradation mechanism, and adsorption models were applied to analyze the EIS results and quantify the reaction kinetics parameters. The experimental observations from cyclic voltammetry, polarization, and scanning electron microscopy support the proposed model.
Article
Chemistry, Physical
Daniel Sikstrom, Aroosa Javed, Shoaib Muhammad, Venkataraman Thangadurai
Summary: Perovskite-type Nd0.75Ba0.25Co0.8Fe0.2O3-delta (NBCF25) was synthesized via solid-state method and showed a single-phase orthorhombic structure. It exhibited minor reactivity with Sr and Mg-doped LSGM when sintered at 1050 degrees C. The sintered sample pellets showed a maximum conductivity of 674 S/cm at 700 degrees C. AC electrochemical impedance spectroscopy measurements on LSGM pellets revealed that NBCF25 has the lowest area-specific resistance of 0.07 omega cm(2) at 800 degrees C in air. Impedance spectroscopy genetic programming was used to understand the oxygen reduction reaction.
Article
Engineering, Environmental
Siyu Ding, Chen Zhu, Hajime Hojo, Hisahiro Einaga
Summary: The study investigated microwave-assisted heterogeneous catalytic oxidation of benzene using Cu-Mn spinel oxides, which showed superior activity and lower apparent activation energy under microwave heating, reducing the required reaction temperature. Transient tests revealed the high reactivity of Cu-Mn spinel oxides related to lattice oxygen on the catalyst surface, which was enhanced under microwave heating, leading to an accelerated benzene oxidation reaction. The combination of adsorption and catalytic oxidation processes efficiently decomposed benzene at low concentrations using Cu-Mn spinel oxides and zeolites.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Review
Chemistry, Physical
Kohei Shimokawa, Takuya Hatakeyama, Hongyi Li, Tetsu Ichitsubo
Summary: A wide variety of crystal structures for MnO2, called polymorphs, has potential for cathode materials in next-generation batteries. The focus of this review is on alpha-MnO2 and lambda-MnO2 structures and their criteria for achieving topotactic reactions during magnesiation. The stability of lambda-MnO2 can be improved by materials design, as demonstrated by the successful example of defect spinel ZnMnO3.
CURRENT OPINION IN ELECTROCHEMISTRY
(2023)
Article
Chemistry, Physical
Sadjad Sabzalian, Mansour Soltanieh, Saeed Rastegari
Summary: Buckling damage and spallation are significant challenges in electroplated Cu-Mn oxide spinel coatings used for SOFC interconnects. The formation mechanism of (Cu,Mn)3O4 spinel coating on AISI-430 stainless steel during oxidation at 750 degrees C has been investigated. It was found that nickel strike deposition can effectively reduce coating spallation. The spinel coating inhibits chromium migration and improves the oxidation behavior of the alloy. The oxidation process involves the initial formation of MnO, Mn2O3, and Mn3O4, followed by the oxidation of copper to CuO and the replacement of MnO and Mn3O4 by Mn2O3. (c) 2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Zhipei Zhong, Jinye Li, Lanyan Li, Xiaoyi Xi, Zhigao Luo, Guozhao Fang, Shuquan Liang, Xianyou Wang
Summary: This study proposes an efficient dissolution/deposition chemistry utilizing anionic groups interference in the electrolyte to enhance the specific capacity of zinc-manganese batteries at low current density. The reaction mechanism involves a dissolution-deposition process coupled with Zn2+/H+-insertion/extraction. The capacity provided by the dissolution/deposition process is evaluated semi-quantitatively. These findings offer new insights into artificially manipulating the structural evolution and electrochemical processes of Mn-based cathodes, and pave the way for advanced zinc-manganese battery design.
ENERGY STORAGE MATERIALS
(2022)
Article
Electrochemistry
Ahamed Irshad, Rodrigo Elizalde-Segovia, B. S. Jayathilake, Billal Zayat, S. R. Narayanan
Summary: The present study identifies the factors affecting the internal resistance and rate capability of Ketjenblack-carbon based sulfur cathodes and demonstrates the improvement achieved by adding low-surface area carbon material. The findings provide insights for enhancing the formulation and design of sulfur cathodes.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Nanoscience & Nanotechnology
Sandip K. Pahari, Yit-Tsong Chen
Summary: This study investigates the formation of intermediates in electrocatalyst-assisted water splitting using a bifunctional mechanism, and confirms the role of functionalized carboxylates in improving catalytic efficiency through pH-dependent and isotope labeling experiments.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Ceramics
Hyeongwon Jeong, Bharat Sharma, Seungyeon Jo, Yo Han Kim, Jae-ha Myung
Summary: The LSM-ScSZ composite electrode for SOFC cathode shows promising performance in oxygen reduction reaction. A properly controlled composition and sintering temperature improve the microstructure of the electrode, leading to reduced impedance and enhanced active surface area and connectivity. This study suggests an integrated approach in the development of SOFC cathode design using commercial materials.
JOURNAL OF THE KOREAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Analytical
Chia -Wei Lin, Manjula Natesan, Sarute Ummartyotin, Yu -Hsu Chang
Summary: 3D-flower structured ZnxCu1-xCo2O4 (x = 0, 0.1, 0.2, 0.3, 0.4) supported on nickel foam was successfully synthesized by hydrothermal method. The prepared Zn0.1Cu0.9Co2O4 catalyst shows superior electrochemical performances in oxygen evolution reaction (OER) with larger electrochemically active surface area, higher electrical double layer capacitance, and higher Faradaic efficiency.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Review
Chemistry, Physical
Jingjing Li, Pengchao Ruan, Xianhong Chen, Shaorong Lei, Bingan Lu, Zhizhao Chen, Jiang Zhou
Summary: In order to facilitate convenient and healthy lives, human body electronic devices with interactive, medical, and communication functions have been developed. However, the application of aqueous batteries in these devices is still at the proof-of-concept stage despite extensive research progress.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Physical
Shuya Wang, Xingwu Zou, Chunsong Li, Hong Zheng, Bo Li, Quanchao Zhuang
Summary: By synthesizing a manganese-containing KIB cathode with a yolk-shell structure, the researchers achieved large charge-discharge capacity and good cycle stability. The yolk-shell structure prevents particle rupture, helping to form a stable solid electrolyte interface (SEI) film and reducing the exposure of Mn ions to the electrolyte, leading to long-term cycle stability. This study provides a universal method to enhance the cycling performance of manganese-containing cathodes for KIBs applications.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Physical
Christoph Doerfelt, Michelle Hammerton, David Martin, Alexander Wellmann, Clara C. Aletsee, Moniek Tromp, Klaus Koehler
Summary: New insights into the catalytic mechanism of copper aluminate spinel catalysts were obtained through systematic studies on their structure and activity, with a focus on the effects of manganese as a catalyst component. Incorporation of manganese stabilizes the spinel structure towards reduction of copper, but also leads to decreased catalytic activity. The catalytic cycle involves a predominantly interface-based reaction mechanism, where protonation and reduction of aldehydes occur on both the spinel and copper nanoparticle surface.
JOURNAL OF CATALYSIS
(2021)
