Article
Electrochemistry
Marveh Forghani, Amanda P. Cameron, Scott W. Donne
Summary: This study compares and contrasts the mechanisms of charge storage in four typical electrochemical capacitor systems based on activated carbon, ruthenium dioxide, manganese dioxide, and nickel hydroxide. While activated carbon and ruthenium dioxide store delocalized charge, manganese dioxide localizes charge in alkaline electrolytes. Nickel hydroxide, on the other hand, exhibits charge localization in alkaline electrolytes due to its two-phase redox mechanism.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Geochemistry & Geophysics
Mehmet Ali Recai Onal, Lopamudra Panda, Prasad Kopparthi, Veerendra Singh, Prakash Venkatesan, Chenna Rao Borra
Summary: The study presents a hydrometallurgical route for producing battery-grade MnO2 using furnace dust, achieving over 90% manganese recovery by directly and completely dissolving manganese in the dust without the need for high-temperature pre-reduction.
Article
Chemistry, Multidisciplinary
Wenwen Bao, Senhe Huang, Diana Tranca, Boxu Feng, Feng Qiu, Fermin Rodriguez-Hernandez, Changchun Ke, Sheng Han, Xiaodong Zhuang
Summary: The study investigates the electrochemical reduction of CO2 using metal porphyrins as molecular catalysts, focusing on their symmetric architecture and aggregation behavior. The results show that the electron-donating effect of 2,6-dimethylbenzene can enhance CO2 reduction performance. The asymmetric Co-II porphyrin exhibits the best catalytic activity, with a low onset potential and high faradaic efficiencies. The study also provides insights into molecular design for efficient electrochemical CO2 reduction.
Article
Physics, Applied
Hidenori Yamada, Toshishige Yamada
Summary: A model for ultracapacitor capacitance and ion screening length based on semiconductor physics is presented, showing the relationship between screening length and capacitance in a double-layer. Effective bandgap of the electrolyte/solvent pair is related to dissolved ion density, which in turn influences the capacitance and screening length dependence on temperature. The estimated effective bandgap for commonly used electrolytes in ultracapacitors is on the order of a few 100meV.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Engineering, Chemical
Zhisheng Zhao, Rui Wang, Jiancheng Shu, Mengjun Chen, Zhonghui Xu, Tao Xue, Xiangfei Zeng, Dejun He, Daoyong Tan, Zongyu Deng, Kehua Ai
Summary: In this study, the leaching efficiency of manganese from electrolytic manganese residue (EMR) was improved using Na2SO3 and electric field. The results showed that the leaching efficiency of manganese reached 96.63%, which was higher than leaching with H2SO4 and electric field. The kinetic results indicated that the process is controlled by a mixture of external diffusion interfaces and chemical reactions, with an activation energy of 19.68 kJ/mol. Na2SO3 and electric field enhanced the leaching of manganese by removing the compound salts layer wrapped around the outside of manganese and reducing the release of high-valent manganese to divalent manganese. This study provides a novel approach for the utilisation of EMR.
MINERALS ENGINEERING
(2022)
Article
Chemistry, Physical
Arvind Kumar, Narendra Singh, Davinder Kaur
Summary: The present study demonstrates the fabrication of an ITO/MnO2/ITO capacitor-based transparent ReRAM device. This device exhibits high transparency and stable bipolar resistive switching characteristics. It is found that the current in the low resistance state is governed by Ohmic conduction, while the high resistance state is dominated by trap-controlled space charge limited conduction mechanism. The resistive switching phenomenon in this device is attributed to the formation and rupture of conduction filament via electron trapping and de-trapping in oxygen vacancies. Reliability tests show good endurance and long retention for the MnO2-based device, making it a promising transparent electronic device for AI applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Chemical
Xiaohui Wang, Xue Wang, Yali Wang, Quanguo Zhai, Yucheng Jiang, Shuni Li
Summary: In this study, a series of protonated nanobelts based on octahedral molecular sieve-5 (OMS-5) were synthesized and used for electrochemical enrichment of rubidium ion (Rb+) in aqueous solution. The protonated nanobelts exhibited excellent specific capacitance and adsorption capacity, indicating their great potential for selective rubidium ion enrichment.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Environmental Sciences
Yuhang Qiu, Ke Qu
Summary: A binary hybrid polyaniline-MnO2 organic-inorganic nanocomposite was prepared and successfully applied for electrochemical sensing of nitrite. The nanocomposite exhibited broad linear ranges and low limits of detection, and showed satisfactory sensing performance in real water sample analysis. The amine and imino groups of polyaniline improved the adsorption behavior of nitrite on the nanocomposite, enhancing its sensing performance.
ENVIRONMENTAL RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Javaid Ismail, Muhammad Sajjad, Muhammad Zia Ullah Shah, Rafaqat Hussain, Basit Ali Khan, Rabia Maryam, A. Shah, Arshad Mahmood, Shams Ur Rahman
Summary: In this study, a series of MnSe-GO nanocomposites were prepared via a hydrothermal route and the effect of GO content on the electrochemical properties of the composites was investigated. It was found that the 5% GO composite exhibited the best electrochemical performance for supercapacitors and asymmetric supercapacitors.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Physical
Dun Lin, Swetha Chandrasekaran, Jean-Baptiste Forien, Xinzhe Xue, Anica Pinongcos, Emma Coester, Marcus A. Worsley, Yat Li
Summary: Researchers have developed a 3D printed graphene aerogel (3D GA) with sparsely separated exterior ligaments and densely arranged interior ligaments, providing large open channels for mass transport and large ion-accessible active surface. The unique structural design allows for even deposition of MnO2 at ultrahigh mass loading and high volumetric capacity in non-aqueous electrolytes. A Li-ion hybrid capacitor device assembled with a graded 3D GA/MnO2 cathode and graded 3D GA/VOx anode exhibits a wide voltage window and superior volumetric energy density.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Analytical
Atul A. Pawar, Harshad A. Bandal, Anand Rajkamal, Hern Kim
Summary: Cu2O@PANI composite material has been synthesized with superior catalytic activity and selectivity for the conversion of CO2 to methanol. The synergism between Cu2O and PANI enables the material to exhibit excellent properties, such as reducing multiple species, enhancing electrical conductivity, and lowering resistance. Electrochemical and theoretical analysis confirm these properties and reveal the mechanism by which the Cu2O@PANI matrix promotes product formation.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Energy & Fuels
Haseebul Hassan, Muhammad Waqas Iqbal, Soumaya Gouadria, Amir Muhammad Afzal, H. H. Hegazy
Summary: This study presents an electrochemically stable ethylene glycol (EG)-derived electrolyte for supercapacitors, which shows excellent electrochemical performance and high mechanical tensile strength. The asymmetric device of VMnS//AC with 4 M LiBF4-EG can be utilized in energy storage systems.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Physical
Qiaohui Duan, Yao Wang, Shuyu Dong, Denis Y. W. Yu
Summary: The addition of Bi2O3 to EMD electrode can suppress the formation of ZnMn2O4 and improve its cyclability. Bi2O3 has the ability to interact with zinc under alkaline conditions and reduce the amount of zincate ions in the electrolyte.
JOURNAL OF POWER SOURCES
(2022)
Article
Electrochemistry
Xianzhong Sun, Xiong Zhang, Kai Wang, Yabin An, Xiaohu Zhang, Chen Li, Yanwei Ma
Summary: The study focused on determining the reliable operating voltage of Lithium-ion capacitors (LICs) by using quantifiable evaluation criteria, providing new guidance for developing high-voltage practical LIC systems.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Multidisciplinary
Anum Zahid, Afzal Shah, Iltaf Shah
Summary: The oxide derived copper (ODCu) electrode showed high selectivity and enhanced current density for the electrochemical reduction of CO2, especially for the production of C2+ products. The catalyst achieved a high Faradaic efficiency of up to 58% at a lower overpotential.
Review
Chemistry, Physical
Michael J. Glenn, Jessica A. Allen, Scott W. Donne
JOURNAL OF POWER SOURCES
(2020)
Article
Electrochemistry
Matthew A. Hughes, Jessica A. Allen, Scott W. Donne
Article
Nanoscience & Nanotechnology
Yang Fu, Kangkang Li, Munkhbayar Batmunkh, Hai Yu, Scott Donne, Baohua Jia, Tianyi Ma
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Electrochemistry
Marveh Forghani, Julien McCarthy, Amanda P. Cameron, Sofia B. Davey, Scott W. Donne
Summary: This study examined the semiconducting nature of electrodeposited manganese dioxide (gamma-MnO2) and its effects on pseudo-capacitive electrode behavior in neutral electrolytes through a combination of cyclic voltammetry, step potential electrochemical spectroscopy, and electrochemical impedance spectroscopy. The analysis of EIS data using the Mott-Schottky equation revealed both n-type and p-type behavior for the manganese dioxide electrode, with determined flat band potentials. The study concluded that the electrochemically active surface area was more closely related to the geometric surface area.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Electrochemistry
Jialong Wang, Md Monirul Islam, Scott W. Donne
Summary: This study describes a modified Swagelok electrochemical cell to characterize individual electrode behavior in the non-aqueous Li-LiMn2O4 system. The outcomes include variations in lithium negative electrode potential with applied current, lithium corrosion and passivation in the electrolyte, and LiMn2O4 dissolution with cycling, revealing Mn(III) as the dissolution product. The application of this technique to other systems, such as electrode materials and electrolytes, is also discussed.
ELECTROCHIMICA ACTA
(2021)
Article
Electrochemistry
Marveh Forghani, Amanda P. Cameron, Scott W. Donne
Summary: This study compares and contrasts the mechanisms of charge storage in four typical electrochemical capacitor systems based on activated carbon, ruthenium dioxide, manganese dioxide, and nickel hydroxide. While activated carbon and ruthenium dioxide store delocalized charge, manganese dioxide localizes charge in alkaline electrolytes. Nickel hydroxide, on the other hand, exhibits charge localization in alkaline electrolytes due to its two-phase redox mechanism.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Danielle Butts, Juergen Schoiber, Christopher Choi, Guenther J. Redhammer, Nicola Huesing, Scott Donne, Bruce Dunn
Summary: This paper converted the well-known superionic conductor Na beta''-Al2O3 into a high-rate Na+ negative electrode by substituting Fe for Al, achieving mixed electron-ion conduction. The Fe-substituted Na beta''-Al2O3 exhibited high ionic conductivity and high-rate performance, with a surface-controlled charge-storage mechanism responsible for the latter. This transformation provides design rules for achieving high-rate redox electrodes from solid-state electrolytes.
CHEMISTRY OF MATERIALS
(2021)
Article
Electrochemistry
Sofia B. Davey, Amanda P. Cameron, Kenneth G. Latham, Scott W. Donne
Summary: This study used step potential electrochemical spectroscopy to characterize the dynamics of charge storage on a planar non-porous glassy carbon electrode in an aqueous electrolyte, revealing diffuse nature of electrolyte charge storage that extends a substantial distance even for concentrated electrolytes. This finding challenges the expected parallel planes of charge for double layer formation at the interface and has implications for the use of porous materials.
ELECTROCHIMICA ACTA
(2021)
Article
Chemistry, Multidisciplinary
Masud Hassan, Yanju Liu, Ravi Naidu, Jianhua Du, Fangjie Qi, Scott W. Donne, Md Monirul Islam
Summary: The study synthesized HNT-BC@Alg composite adsorbents for the removal of heavy-metal ions in water, showing good adsorption performance and rapid adsorption kinetics, with high removal efficiency observed in a mesoporous structure rich in functional groups. The removal of heavy-metal ions is significantly influenced by siloxane groups, oxygen-containing functional groups, as well as hydroxyl and carboxyl groups in the adsorbent.
Article
Electrochemistry
Sofia B. Davey, Amanda P. Cameron, Kenneth G. Latham, Scott W. Donne
Summary: This study examined the electrified interface between a planar non-porous glassy carbon electrode and a 0.5 M Na2SO4 aqueous electrolyte using SPECS and EIS techniques, providing insights into the variation of capacitance across the potential window and the role of EIS frequency in determining capacitance. The results highlighted the impact of mass transport on the amount of charge storage at the interface, showing the dynamics of interface formation and structure.
ELECTROCHIMICA ACTA
(2021)
Article
Electrochemistry
Amanda P. Cameron, Sofia B. Davey, Kenneth G. Latham, Scott W. Donne
Summary: It was found that the capacitance of the GCE in 1 M TEABF(4) in acetonitrile was significantly higher compared to that in 0.5 M Na2SO4, primarily due to the solvation of adsorbing electrolyte ions.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Electrochemistry
Amanda P. Cameron, Sofia B. Davey, Caitlin L. Callahan, Scott W. Donne
Summary: This study provides insights into the structure and behavior of the electrified interface between a planar non-porous glassy carbon electrode and a 0.5 M Na2SO4 aqueous solution. By using a rotating glassy carbon disk electrode, it is observed that increasing rotation rates lead to decreasing boundary layer thicknesses and interfacial capacitance. This suggests that electrolyte counter charge extends significantly into the electrolyte due to the dissipation of counter charge through convective flow outside the macroscopically thick boundary layer.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Electrochemistry
Thibaud Guillemin, Camille Douard, Anthony Impellizzeri, Christopher P. Ewels, Bernard Humbert, Christophe Lethien, Scott W. Donne, Jean Le Bideau, Thierry Brousse
Summary: We investigated the contribution of pseudocapacitance to the overall capacitance of MnO2 electrodes in pure and alkaline-doped ionic liquids using step potential electrochemical spectroscopy (SPECS) and in situ Raman spectroscopy. Pseudocapacitive charge storage accounted for over half of the total capacitance with alkaline-doped ionic liquids. In situ Raman spectroscopy provided insight into the reversible ion intercalation in the MnO2 structure.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Kenneth G. Latham, Marveh Forghani, Wesley M. Dose, Jessica A. Allen, Scott W. Donne
Summary: This study explored the influence of four different attached counter ions on the physicochemical properties and electrochemical performance of carbon structures nitrogen-doped via hydrothermal carbonization of ammonium. The results showed significant differences in nitrogen incorporation levels, physicochemical properties, and supercapacitor performance among the different counter ions. The findings suggest that the choice of counter ion can play a crucial role in tailoring the properties of the resulting material.
MATERIALS ADVANCES
(2021)
Article
Chemistry, Multidisciplinary
Andre Cook, Timothy W. Jones, Jacob Tse-Wei Wang, Hua Li, Rob Atkin, Noel W. Duffy, Scott W. Donne, Gregory J. Wilson
