Article
Chemistry, Multidisciplinary
Qianlu Zheng, Zachary A. H. Goodwin, Varun Gopalakrishnan, Alexis G. Hoane, Mengwei Han, Ruixian Zhang, Nathaniel Hawthorne, James D. Batteas, Andrew A. Gewirth, Rosa M. Espinosa-Marzal
Summary: This study investigates the influence of water on the performance of electrochemical devices using hydrophilic and hydrophobic ionic liquids as electrolytes. The results show that water uptake slightly reduces the electrochemical stability of ionic liquids and significantly affects the potential of zero charge of graphene. Hydrophilic ionic liquids efficiently screen surface charge, while hydrophobic ones are less efficient. Water uptake also leads to changes in the interfacial layering, which is important for the design of graphene-based electrochemical devices.
Article
Electrochemistry
Aleksey Khlyupin, Irina Nesterova, Kirill Gerke
Summary: Electrode surface roughness has a significant impact on the molecular scale structure of the electric double layer. We derived analytical solutions for the differential capacitance of the electric double layer near a rough electrode surface and compared them with experimental and numerical studies. Two causes of ion separation, ion size asymmetry and electrode surface roughness, were considered. The model predicts a transformation of the differential capacitance curve from a bell shape to a camel shape due to electrode surface roughness.
ELECTROCHIMICA ACTA
(2023)
Review
Chemistry, Physical
Yury A. Budkov, Andrei L. Kolesnikov
Summary: This review briefly summarizes the basic theoretical milestones achieved in the mean-field theory of room temperature ionic liquids on charged electrodes since the publication of Kornyshev's seminal article in 2007. The behavior of the differential capacitance profile and the microscopic parameters of ions that can have a substantial influence on it are given special attention. The recent Maniacal mean-field theories, which can describe the overscreening behavior of the local ionic concentrations and the crossover from overscreening to crowding, are also discussed.
CURRENT OPINION IN ELECTROCHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Srinivas Gadipelli, Hanieh Akbari, Juntao Li, Christopher A. Howard, Hong Zhang, Paul R. Shearing, Dan J. L. Brett
Summary: Supercapacitors made from porous carbon and graphene-oxide show variations in capacitance values, ranging from 25 to 350 F g(-1). This study demonstrates the importance of structure-controlled charge storage relationships and establishes the link between oxygen functional concentration and capacitance.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Review
Chemistry, Physical
Lulu Zhang, Jun Huang
Summary: This Opinion article addresses the challenges in measuring and interpreting the electric double layer (EDL) at Pt(111)/aqueous solution interfaces using classical electrochemical methods. The article discusses discrepancies in measuring double layer capacitance, examines assumptions and limitations of the Frumkin-Melik-Gaikazyan (FMG) model, and compares the capacitance values derived from cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The article aims to contribute to a better understanding of the EDL at Pt(111)/aqueous solution interfaces.
CURRENT OPINION IN ELECTROCHEMISTRY
(2023)
Article
Electrochemistry
Anis Allagui, Mohammed E. Fouda
Summary: This study explores the computation of capacitance from time-domain data, utilizing definitions of capacitance and frequency-domain data analysis. Experimental results demonstrate the effectiveness of the capacitance calculation method in different scenarios.
ELECTROCHIMICA ACTA
(2021)
Review
Chemistry, Physical
Katharina Doblhoff-Dier, Marc T. M. Koper
Summary: The electric double layer is a fundamental concept in electrochemistry, but its exact structure remains unresolved. This study discusses the current knowledge and gaps in understanding the structure of the Pt(111) double layer near the potential of zero charge (pzc). By analyzing various models, it is suggested that water adsorption at the interface plays an important role in interpreting capacitance features observed near the pzc. However, the deviations from Gouy-Chapman diffuse layer theory in low electrolyte concentration require further investigation.
CURRENT OPINION IN ELECTROCHEMISTRY
(2023)
Article
Chemistry, Physical
Austin Yuhang Yap, Sook Wai Phang, Chiam-Wen Liew
Summary: In this study, gel polymer electrolytes (GPEs) based on poly(vinyl acetate) (PVAc) were synthesized using ex-situ polymerization. The GPEs were prepared from precursor solutions containing different volume ratios of vinyl acetate monomer and 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BMIMTFSI) with a fixed concentration of lithium bis(trifluoromethylsulfonyl)imide (LiTFSI). The GPE with 35% (v/v) of BMIMTFSI showed the highest ionic conductivity and a glass transition temperature of -28.01°C. Addition of BMIMTFSI increased the specific capacitance of the GPEs and improved their energy and power densities.
Review
Chemistry, Physical
Nikolai N. Kalikin, Andrei L. Kolesnikov, Yury A. Budkov
Summary: The number of electrochemical applications involving ionic liquids and their polymerized forms is increasing. However, theoretical descriptions of polymeric ionic liquid-based electrochemical systems are lacking compared to monomeric ionic liquid-based systems. In this study, recent studies on basic and applied research of polymeric ionic liquids are briefly outlined, and a theoretical model for the behavior of polymeric ionic liquids and their solutions on charged electrodes is discussed. The obtained capacitance, electrostatic potential, and ionic concentration profiles are summarized, and further development of theoretical descriptions for polymeric ionic liquids is proposed.
CURRENT OPINION IN ELECTROCHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Rishi Pal, Sneh Lata Goyal, Ishpal Rawal, Anil Kumar Gupta, Ruchi
Summary: The successful growth of highly conducting two-dimensional graphene and nanocomposites of polyaniline with graphene has laid the foundation for the development of high efficiency supercapacitors. The supercapacitor based on nanocomposite of polyaniline with graphene exhibits significantly high values of energy and power densities.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2021)
Article
Acoustics
Nianben Zheng, Long Wang, Zhiqiang Sun
Summary: This study aimed to determine the optimal ultrasonication process for preparing stable FLG nanofluids, finding that ultrasonication time is more sensitive to the stability of nanofluids than ultrasonication power.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Alireza Ahmadian Yazdi, Jie Xu, Vikas Berry
Summary: The ionic flow over graphene induces localized doping, affecting graphene's Fermi energy level logarithmically with flow velocity. This correlation allows for the use of graphene as a non-invasive optical flow sensor capable of measuring flow rates at high spatial resolution.
Article
Biochemistry & Molecular Biology
Christian Rodenbuecher, Yingzhen Chen, Klaus Wippermann, Piotr M. Kowalski, Margret Giesen, Dirk Mayer, Florian Hausen, Carsten Korte
Summary: Protic ionic liquids show promising application prospects in fuel cells by increasing operation temperatures, facilitating water and heat management, and enhancing efficiency. Experimental and theoretical studies reveal a layered structure at the electrolyte-electrode interface, indicating that the presence of water can significantly affect the system's electrochemical performance.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Chemistry, Physical
Yi-Jung Tu, Jesse G. McDaniel
Summary: Using constant voltage molecular dynamics simulations, we found that ionic liquids exhibit camel-shaped capacitance profiles with two peaks on either side of a minimum centered at the potential of zero charge on model graphene electrodes. The electric-field-induced rearrangement of ion structure within the inner layer closest to the electrode interface were observed, resulting in increased inner-layer charge density and higher capacitance with increasing voltage. The presence of organic solvent significantly alters the composition of the inner layer, affecting the ion/electrode contact at moderate potentials.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Xuezhong Zhang, Zijian Dai, Jie Chen, Xin Chen, Xiong Lin, Shuang Yang, Kai Wu, Qiang Fu, Hua Deng
Summary: Currently, the introduction of a gradient structure in moisture-electricity generators (MEGs) has significantly improved their output performance. However, it has been impossible to combine ion density and hydrophilicity gradients in one system, limiting the power and duration of MEGs. This study presents double-gradient aerogel-based MEGs prepared using carbon nanotubes and polymer dendritic colloids, which show industry-leading energy density, power density, and duration. The MEGs also have potential applications in humidity sensing, low-power device power supply, and seawater desalination, providing an inspiring approach for energy harvesting.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Physics, Condensed Matter
Ai Suzuki, Tomoya Taguchi, Huan Li, Yanan Wang, Hirofumi Ishii, Yen-Fa Liao, Hidenori Goto, Ritsuko Eguchi, Yoshihiro Kubozono
Summary: The study investigated the crystal structure and superconductivity of the topological insulator PdBi2 under pressure, revealing stable superconductivity and a high superconducting transition temperature in the beta phase. Unlike the alpha phase, the beta phase did not undergo structural phase transitions under pressure.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Chemistry, Inorganic & Nuclear
Tomoya Taguchi, Yanan Wang, Xiaofan Yang, Huan Li, Yasuhiro Takabayashi, Kouichi Hayashi, Takafumi Miyazaki, Yen-Fa Liao, Hirofumi Ishii, Hidenori Goto, Ritsuko Eguchi, Yoshihiro Kubozono
Summary: The study investigated the pressure dependence of electric transport in Ba0.77Na0.23Ti2Sb2O and identified a structural phase transition at 8-11 GPa that significantly influenced superconductivity, showing a clear relationship between crystal structure and superconductivity.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Physical
Huan Li, Tomoya Taguchi, Yanan Wang, Hidenori Goto, Ritsuko Eguchi, Hirofumi Ishii, Yen-Fa Liao, Yoshihiro Kubozono
Summary: The study investigates the pressure dependence of the electrical resistance of superconducting 4d and 5d transition metal compounds CaRh2 and CaIr2, revealing a saturation of their superconducting transition temperatures at high pressures. The crystal structures of CaRh2 and CaIr2 are determined at high pressures, and their superconductivity is analyzed using different pairing models. The report provides a systematic study on the pressure dependence of superconductivity in binary-element compounds containing alkali-earth and 4d or 5d transition metal atoms.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Physics, Condensed Matter
Tomoya Taguchi, Mitsuki Ikeda, Huan Li, Ai Suzuki, Xiaofan Yang, Hirofumi Ishii, Yen-Fa Liao, Hiromi Ota, Hidenori Goto, Ritsuko Eguchi, Yoshihiro Kubozono
Summary: The crystal structures of Sb2Te3-y Se (y) at different pressures were analyzed by synchrotron x-ray diffraction, revealing phase transitions and emergence of superconductivity. Samples with different stoichiometries exhibited distinct structural transitions and superconducting behaviors under increasing pressure.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Chemistry, Multidisciplinary
Yanting Zhang, Ritsuko Eguchi, Shino Hamao, Hideki Okamoto, Hidenori Goto, Yoshihiro Kubozono
Summary: This study provides a precise evaluation of the field-effect mobility mu in organic thin-film and single-crystal FETs using a new indicator called effective field-effect mobility mu(eff). The FET performance based on mu(eff) values is discussed, showing that mu(eff) values of single-crystal FETs are consistent with previous mu values, while mu(eff) values of thin-film FETs are lower due to a high absolute threshold voltage.
Article
Chemistry, Physical
Ai Suzuki, Mitsuki Ikeda, Hirofumi Ishii, Yen -Fa Liao, Yasuhiro Takabayashi, Kouichi Hayashi, Hidenori Goto, Ritsuko Eguchi, Yoshihiro Kubozono
Summary: New superconducting materials Pd1-xPtxBi2 were prepared via Pt doping of PdBi2, with the highest Tc value of 4.35 K observed at x = 0.12. The study investigated the crystal structure and superconducting transition temperature of Pd0.88(6)Pt0.12(6)Bi2.2(2) over a wide pressure range, showing a shift in superconducting behavior from alpha phase to beta phase with increasing pressure.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Yanting Zhang, Shino Hamao, Hidenori Goto, Yoshihiro Kubozono, Hideki Okamoto, Kunihisa Sugimoto, Nobuhiro Yasuda, Akihiko Fujiwara, Ritsuko Eguchi
Summary: Researchers have demonstrated the high carrier transport capability of molecules with extended conjugation in small molecules, highlighting its significance in the development of high-performance organic electronic devices and new applications.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Inorganic & Nuclear
Mitsuki Ikeda, Ai Suzuki, Yanting Zhang, Hidenori Goto, Ritsuko Eguchi, Yen-Fa Liao, Hirofumi Ishii, Yoshihiro Kubozono
Summary: The crystal structure and superconducting properties of a new type of titanium-pnictide superconductor, BaTi2(Sb1-yBiy)2O (y = 0.2, 0.5, and 0.8), were comprehensively investigated to understand the effect of substituting Bi for Sb on the superconducting behavior.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Mitsuki Ikeda, Zhiyan Zhang, Hidenori Goto, Ritsuko Eguchi, Yen-Fa Liao, Hirofumi Ishii, Yoshihiro Kubozono
Summary: This paragraph provides the personal information of Yoshihiro Kubozono, a researcher at the Research Institute for Interdisciplinary Science, Okayama University, Japan. It includes his affiliation, research interests, and contact details.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Kazumasa Horigane, Masayuki Tadokoro, Ritsuko Eguchi, Hirofumi Ishii, Shinichi Nakamura, Takashi Kambe, Naoshi Ikeda, Hidenori Goto, Yoshihiro Kubozono, Jun Akimitsu
Summary: A graphite-like material BCx and its precursor phase were synthesized and characterized in this study. High-temperature annealing was found to improve the crystallinity and physical properties of BCx. Ti intercalation into the BCx system was found to compensate hole carriers and alter its magnetic properties.
INORGANIC CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Yanting Zhang, Ritsuko Eguchi, Hideki Okamoto, Kenta Goto, Fumito Tani, Minoru Yamaji, Hidenori Goto, Yoshihiro Kubozono
Summary: Alkyl-phenyl[n]phenacenes with different alkyl substituents were synthesized and investigated for their application in high-performance thin-film FET devices. Among them, PhC10-PIC showed the highest field-effect mobility.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Physical
Huan Li, Mitsuki Ikeda, Ai Suzuki, Tomoya Taguchi, Yanting Zhang, Hidenori Goto, Ritsuko Eguchi, Yen-Fa Liao, Hirofumi Ishii, Yoshihiro Kubozono
Summary: This study investigates the structural and superconducting properties of alkali-Bi-based compounds KBi2 and RbBi2 under a wide range of pressures. The results demonstrate the presence of two superconducting phases in low-pressure range and the decomposition of KBi2 into KBi and Bi at high pressures. The stability of superconducting properties for RbBi2 is relatively constant under pressure. Additionally, the study explores the deviation of superconducting Cooper pair symmetry from the simple s-wave pairing model, indicating the complex electronic structure of Bi.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Yanan Wang, Tomoya Taguchi, Huan Li, Ai Suzuki, Yanting Zhang, Akari Miura, Mitsuki Ikeda, Hidenori Goto, Ritsuko Eguchi, Takafumi Miyazaki, Yen-Fa Liao, Hirofumi Ishii, Yoshihiro Kubozono
Summary: In this study, preparation and characterization of BaBi3 were reported using DC magnetic susceptibility, powder X-ray diffraction (XRD), and electrical transport to elucidate the superconducting properties under different pressures. The results showed that BaBi3 maintains the alpha phase structure under pressure, while lattice constants and unit cell volume decrease with increasing pressure. This study provides a comprehensive analysis of the superconducting behavior of BaBi3 over a wide pressure range for the first time.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Yanting Zhang, Ritsuko Eguchi, Shino Hamao, Kenta Goto, Fumito Tani, Minoru Yamaji, Yoshihiro Kubozono, Hideki Okamoto
Summary: Dibenzo[n]phenecenes (DBnPs, n = 5-7) were conveniently synthesized through Mallory photocyclization. The effective mobilities of single-crystal field-effect transistors of DBnPs were evaluated, showing that C-2h-symmetrical DB6P performs better than C-2v-symmetrical DB5P and DB7P.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Niko Fioravanti, Luca Pierantoni, Davide Mencarelli, Claudio Turchetti, Shino Hamao, Hideki Okamoto, Hidenori Goto, Ritsuko Eguchi, Akihiko Fujiwara, Yoshihiro Kubozono
Summary: Organic field-effect transistors can be used in RFID tags and flat-panel displays. The study compared two ring oscillators using different FETs and introduced a low-voltage operation with ZrO2 as the gate dielectric material. The higher mobility in p-channel FETs compared to n-channel FETs needs to be addressed to increase oscillation frequency.
