Article
Chemistry, Physical
Kyeong Eun Song, Harald Schlegl, Hyunil Kang, Wonseok Choi, Jung Hyun Kim
Summary: The composition of layered perovskite SmBa0.5Sr0.5Co2O5+d was modified to different non-stoichiometric compositions by altering the substitution amount of Ba and Sr. SmBa0.45Sr0.5Co2O5+d (SBSCO-0.45/0.5) exhibited the lowest area specific resistance (ASR) due to its largest area % caused by high binding energy (HBE) of O1s in X-ray photoelectron spectroscopy (XPS) analysis and smaller unit cell volume compared to other compositions. SmBa0.5Sr0.48Co2O5+d (SBSCO-0.5/0.48), with the least decrease in oxygen content and the largest area % of Co3+ and Co4+ coexistence regions of Co2p in XPS analysis, showed the highest electrical conductivity. The electrical conductivity values and behaviors of porous SBSCO-0.45/0.5 and SBSCO-0.5/0.48 were not significantly different. Comparison between single-cell performances with composite cathodes of SBSCO-0.45/0.5 and SBSCO-0.5/0.48 with CGO91 revealed that the single-cell with SBSCO-0.45/0.5 and CGO91 cathode exhibited higher maximum power density.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Di Yang, Gang Chen, Hailiang Liu, Linlin Zhang, Yang He, Xuebai Zhang, Kai Yu, Shujiang Geng, Ying Li
Summary: The study found that the NCAL cathode has better electrochemical performance at 550 degrees C, especially when used in a composite with GDC with a mass ratio of 8/2. High temperature sintering can decrease the performance of the composite cathode, while the high oxygen vacancy concentration at the NCAL-Li2CO3/GDC interfaces enhances oxygen ion conductivity and lowers the activation energy for reactions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Chemical
Juntao Gao, Yingying Liu, Tian Xia, Liping Sun, Hui Zhao, Bo Wei, Qiang Li
Summary: In this study, Sr0.5Bi0.4Ca0.1FeO3-delta (SBCF) and Sr0.5Bi0.5FeO3-delta (SBF) oxides were investigated as oxygen electrodes for solid oxide fuel cells (SOFCs). SBCF showed lower polarization resistance and better chemical stability, suggesting its potential as an electrode for SOFCs.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Juntao Gao, Qiang Li, Miaomiao Guo, Liping Sun, Lihua Huo, Hui Zhao
Summary: Developing MIEC materials with high electrocatalytic activity and stability is crucial for the success of solid oxide fuel cells (SOFCs). This study synthesized high-activity BSFO-xGDC oxygen electrodes and found that BSFO-30GDC composite cathode exhibited the best ORR activity, with a peak power density of 709 mW cm(-2) and an electrode polarization resistance of about 0.14 Omega cm(2) at 700 degrees C, making it a promising cathode catalyst for SOFCs.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Tian Song, Tian Xia, Liping Sun, Qiang Li, Hui Zhao
Summary: Solid oxide fuel cells (SOFCs) have been widely applied in energy conversion field due to their high efficiency, low cost and pollution, and flexible fuel choice. However, the sluggish oxygen reduction reaction (ORR) rate is a challenge for the development of SOFCs. In this study, a series of Ruddlesden-Popper-type Sr2.7Pr0.3Fe2-xCuxO7-delta (SPFCx) oxides were synthesized and evaluated as potential SOFCs cathodes. Among them, Sr2.7Pr0.3Fe1.9Cu0.1O7-delta (SPFC10) showed the best electrocatalysis performance and improved oxygen reduction kinetics. Cu-doping was found to enhance oxygen transport kinetics, increase oxygen vacancy concentration, and improve electrocatalysis performance.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Qifei Zhang, Yunting Hou, Li Chen, Lijun Wang, Kuochih Chou
Summary: The study found that adding GDC material in anode-supported H-SOFC can increase oxygen vacancy concentration and three-phase reaction interface to improve oxygen adsorption and dissociation rate at low temperatures, thereby enhancing cell performance and stability.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Sergey V. Naumov, Maxim I. Vlasov, Elena Yu. Pikalova, Victor A. Tsvinkinberg, Olga G. Reznitskikh, Elena A. Filonova
Summary: Neodymium nickelates Nd2Ni1-xO4+delta with a wide range of Ni non-stoichiometry (x=0.0-0.08) are synthesized and their properties are studied. The XRD data shows that the materials in the x range of 0.0-0.06 have a single-phase orthorhombic structure with a Fmmm space group. TGA-DSC studies reveal that the phase transition temperature does not depend on Ni non-stoichiometry. Raman scattering studies show that at low Ni deficiency the Raman spectra are typical for the Ni-stoichiometric oxidized Nd2NiO4+(delta), while at x=0.06, lattice disorder and octahedral distortions reach a maximum feasibility.
SOLID STATE IONICS
(2023)
Article
Materials Science, Multidisciplinary
Erwin Douguet-Bronnec, Jacques Fouletier, Franck Fournet-Fayard, Marlu Cesar Steil, Philippe Garcia
Summary: This study reports attempts at determining the evolution of oxygen activity in hyper-stoichiometric uranium dioxide for very low deviation from stoichiometry. Solid-state oxidation cycles and oxygen activity measurements were performed on a dense polycrystalline uranium oxide sample, and the data were subsequently analyzed using an oxygen point defect model. The results show that the model accurately reproduces the observed trends in the experimental data.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Chemistry, Physical
Ayesha Akter, John Pietras, Srikanth Gopalan
Summary: This paper investigates the application of a 50 mol% neodymium doped ceria (NDC50) barrier layer between the oxygen electrode and electrolyte. Compared to the GDC10 barrier layer, the NDC50 barrier layer exhibits lower polarization resistance and improved ionic conductivity across a wide range of temperature and oxygen partial pressure.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Ben Ma, Zhaohui Chen, Zhuang Lin, Lin Cheng, Yingke Zhou
Summary: This study investigates the effects of Mg doping on the performance of Mn-Cr spinel oxide cathodes in solid oxide fuel cells (SOFCs). Both experimental results and density functional theory (DFT) calculations show that Mg doping can optimize the electronic structure of the spinel oxide, increase the oxygen vacancy concentration, and improve the electrical conductivity and catalytic activity. The Mg-doped Mn-Cr spinel oxide cathode exhibits superior performance with high area-specific polarization resistance and maximum power density.
JOURNAL OF POWER SOURCES
(2023)
Article
Engineering, Environmental
Fulan Zhong, Zhiyu Li, Yu Luo, Chongqi Chen, Chen Zhou, Li Lin, Guohui Cai, Chaktong Au, Lilong Jiang
Summary: A complex spinel oxide catalyst was prepared to enhance the oxygen reduction reaction in intermediate-temperature solid oxide fuel cells (IT-SOFCs). The introduction of Ni doping optimized the oxidation states of Fe and Co ions, improving small polaron hopping and enhancing electrical conductivity. The electrochemical performance of the NFCO2-based IT-SOFCs outperformed other reported SOFCs with cathodes, achieving a high power density of 1.93 W/cm(2) at 800 degrees C.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Chan Gyu Kim, Sung Hun Woo, Kyeong Eun Song, Seung-Wook Baek, Hyunil Kang, Won Seok Choi, Jung Hyun Kim
Summary: In this study, the electrochemical properties of non-stoichiometric layered perovskites were analyzed for their direct application as cathode materials in Intermediate Temperature-operating Solid Oxide Fuel Cells (IT-SOFC). The overall Area Specific Resistance (ASR) values decreased with increasing removal amount of Sm from x = 0-0.10, then increased for compositions at x = 0.15. Metal-insulator transition (MIT) electrical conductivity properties were observed in all compositions, with the temperature at which MIT occurred increasing as the non-stoichiometric composition increased.
FRONTIERS IN CHEMISTRY
(2021)
Article
Chemistry, Physical
Fuyao Yan, Mufu Yan, Yanxiang Zhang
Summary: The electrical conductivity relaxation method is widely used in solid oxide fuel cell materials to measure the kinetic properties of species transport process using rectangular dense samples. It has been found that the equation of ECR used in some studies is flawed, and an improved equation is presented in this communication.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Multidisciplinary
Daseob Yoon, Yujeong Lee, Gi-Yeop Kim, Youngho Kang, Si-Young Choi, Junwoo Son
Summary: A simple strategy to increase electrical conductivity in perovskite oxide semiconductors has been proposed through non-stoichiometry-driven metal exsolution, leading to enhanced carrier concentration in reduced films.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Shoucheng He, Lanqing Zhang, Jiantao Cai, Xingyu Wu, Hanxi Sun, Tao Du
Summary: LBCMx cathodes synthesized by a sol-gel method showed improved conductivity and thermal expansion coefficient, and significantly increased the maximum power density of a single cell in the intermediate-temperature solid oxide fuel cells.
Article
Chemistry, Physical
Jin Kyu Kim, Kang Min Ok
Summary: A series of Dion-Jacobson type perovskites, RbEu2-xBixTi2NbO10 (0 <= x <= 2), have been synthesized by solid-state reactions. The materials crystallize in either noncentrosymmetric orthorhombic or centrosymmetric tetragonal space groups, depending on the cation composition. The change in centricity from noncentrosymmetric to centrosymmetric occurs when Eu3+ cations occupy more than 30% of the A-site positions. The solid-solution behavior and second-harmonic generation response of the materials are explained by detailed structural analyses and dipole moment calculations.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Yejin Pi, Yunseung Kuk, Kang Min Ok
Summary: Two novel transition metal-doped tungsten bronze oxides, PLNT and PLNW, were synthesized through high-temperature solid-state reactions. The crystal structure analyses showed that both PLNT and PLNW have orthorhombic polar noncentrosymmetric space group Pmn2(1) (no. 31). The highly distorted NbO6 octahedra, along with the Pb/LiO12 and PbO15 polyhedra, form a rigid framework, in which d(0) transition metal cations (Ti4+ or W6+) are doped. PLNT and PLNW exhibit extremely large second-harmonic generation (SHG) responses, mainly due to the alignment of highly distorted NbO6 octahedra with doped transition metals in the frameworks. Doping transition metal cations at the B-site of tungsten bronze structures is considered an innovative strategy for developing high-performance nonlinear optical materials.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Srinivas Samala, Ji Hye Lee, Yeonju Park, Seong-Jin Hong, Hongil Jo, Hyonseok Hwang, Young Mee Jung, Kang Min Ok, Jonathan L. L. Sessler, Chang-Hee Lee
Summary: A pi-extended, diaza-triphenylene embedded, mono-anionic corrole analogue and its Ni-II complex were synthesized. Both compounds were characterized and their optical and electronic properties were studied.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Xuefei Wang, Jihyun Lee, Yang Li, Yunseung Kuk, Kang Min Ok
Summary: Two new cadmium sulfamates have been synthesized, exhibiting interesting structures containing nitrogen-containing octahedra. The discovery provides a new perspective for designing new materials.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Physical
Jiwon Jeong, Daewon Shim, Philip Yox, Myung-Ho Choi, Kang Min Ok, Kirill Kovnir, Gordon J. J. Miller, Tae-Soo You
Summary: Five novel Zintl phase solid solutions in the Ba1-x Sr x Zn2-y Cd y Sb2 system were synthesized and characterized. The radius ratio of cations and anionic elements was identified as a critical factor for phase selectivity. The structural transformation mechanism from CaAl2Si2-type phase to BaCu2S2-type phase was revealed. The thermoelectric properties were enhanced by Sr and Cd doping.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Yeongjin Hong, Junsu Lee, Donghwan Seo, Myung-Ho Choi, Philip Yox, Kirill Kovnir, Gordon J. Miller, Kang Min Ok, Tae-Soo You
Summary: A series of Yb-substituted Zintl phases in the Ca3-xYbxAlSb3 (0 ≤ x ≤ 0.81(1)) system have been successfully synthesized, and their isotypic crystal structures were characterized by X-ray diffraction analysis. The overall structure of these compounds consists of 1-dimensional infinite chains and Ca2+/Yb2+ mixed sites located in between these chains. The charge balance and the independency of the chains were explained by the Zintl-Klemm formalism. DFT calculations showed the heavily doped degenerate semiconducting behavior of the quaternary Ca2YbAlSb3 model and explained the site preference of Yb. Electron localization function calculations revealed the different shapes of lone pairs of Sb atoms and their dependence on local geometry and coordination environment. Thermoelectric measurements showed an enhanced ZT value in the Yb-substituted compound compared to the ternary compound, due to increased electrical conductivity and low thermal conductivity.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Zhiyong Bai, Jihyun Lee, Heewon Kim, Chun-Li Hu, Kang Min Ok
Summary: Two melamine-based metal halides, (C3N6H7)(C3N6H6)HgCl3 (I) and (C3N6H7)(3)HgCl5 (II), were synthesized by covalently coordinating melamine with the heavy d(10) cation, Hg2+, and the halide anion, Cl-. The noncentrosymmetric structure of I is attributed to the large asymmetric secondary building units and the small dihedral angle between melamine molecules. I exhibits a high second-harmonic generation efficiency of 5 x KH2PO4 due to its unique coordination and has a giant optical anisotropy with a birefringence of 0.246@1064 nm.
Article
Chemistry, Multidisciplinary
Zhiyong Bai, Jihyun Lee, Heewon Kim, Yunseung Kuk, Myung-Ho Choi, Chun-Li Hu, Kang Min Ok
Summary: Establishing high-performance ultraviolet (UV) nonlinear optical (NLO) selenite crystals with well-balanced properties is challenging due to their strong absorption for UV light. In this study, a rare-earth selenite, Sc(HSeO3)(3), with excellent UV NLO properties is introduced. The crystal exhibits remarkably well-balanced UV-NLO functionality, making it a new example of discovering novel UV NLO selenite materials.
Article
Crystallography
Sunhwa Moon, Jiehye Shin, Kang Min Ok, Junghwan Do
Summary: This is an article about the crystal structure of C34H36CuN2O4. The article provides relevant crystallographic data and a list of atoms including atomic coordinates and displacement parameters.
ZEITSCHRIFT FUR KRISTALLOGRAPHIE-NEW CRYSTAL STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Sunghwan Cho, Sejin Park, Yunseung Kuk, Kang Min Ok
Summary: A mixed-valent tellurium oxide hydroxide, Te2O4(OH)2, has been synthesized using a hydrothermal reaction method. The compound has a layered structure consisting of Te(VI)O4(OH)2 octahedra and Te(IV)O4 seesaw, aligned through interlayer hydrogen bonds. It exhibits a large SHG efficiency and an expanded band gap compared to Te2O5.
MATERIALS TODAY PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Zhiyong Bai, Kang Min Ok
Summary: Chemically tailoring the tetrahedral [SO4]2- with anisotropic pi-conjugated modules significantly enhances the optical anisotropy of sulfate crystals. Experimental results show that introducing pi-conjugated organic species into the tetrahedral structure greatly improves the optical anisotropy of sulfate crystals, with birefringence values ranging from 23 to 145.5 times higher than those of corresponding sulfates at the 546 nm wavelength.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Inorganic & Nuclear
Myung-Ho Choi, Tae Hwan Moon, Yunseung Kuk, Kang Min Ok
Summary: Reported here is the green and red photoluminescence of two manganese bromide complexes derived from different secondary interactions of aminomethylpyridine isomers. The two positional isomers, 4-amino-3-methylpyridine and 3-amino-5-methylpyridine, produce protonated forms under acidic conditions, forming different hydrogen bonding networks and resulting in different coordination environments. Single-crystal structure analysis revealed different manganese halide units emitting light in the green and red regions.
INORGANIC CHEMISTRY
(2023)
Article
Biochemistry & Molecular Biology
Kyungmin Kim, Jeong Ho Kim, Heejae Choi, Byeongno Lee, Jihyun Lee, Kang Min Ok, Tae Hoon Lee, Hakwon Kim
Summary: In this study, a highly efficient synthetic method for producing anti-inflammatory compounds, particularly N(2)-arylindazol-3(2H)-ones, was developed. The synthesized compound 5 exhibited significant anti-inflammatory effects with low cell toxicity.
Article
Chemistry, Inorganic & Nuclear
Zhiyong Bai, Kang Min Ok
Summary: The weak polarizability anisotropy of the spherical SO42- tetrahedron makes it challenging to obtain sulfate-based materials with large birefringence. To overcome this issue, a polyhedron of stereoactive lone pair cations, IO3-, was introduced into the system. By using an accessible solution-evaporation method, centimetre-sized single crystals of an alkali metal sulfate iodate, K2SO4 center dot HIO3, were readily grown. Optical measurements on the K2SO4 center dot HIO3 single crystals showed a 70-fold increase in birefringence (approximately 0.14 at 589.3 nm) compared to singular sulfate K2SO4, and a blue-shifted UV cutoff edge at 275 nm, 25 nm shorter than alpha-HIO3, indicating the crucial role of the SO42- tetrahedron in broadening the transmittance window.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Physical
Xuefei Wang, Yang Li, Zilong Chen, Jihyun Lee, Fangfang Zhang, Kenneth R. Poeppelmeier, Shilie Pan, Kang Min Ok
Summary: In this study, a novel nonlinear optical material Sr(NO3)(NH2SO3).H2O was successfully designed and synthesized. The compound exhibits unique structure, excellent second harmonic generation response, and optimized birefringence. It also forms large single crystals. This discovery introduces a new class of NLO materials and significantly expands the scope of structural chemistry.
Article
Electrochemistry
Abdul Qayoom Mugheri, Shaista Khan, Ali Asghar Sangah, Aijaz Ahmed Bhutto, Muhammad Younis Laghari, Nadeem Ahmed Mugheri, Asif Ali Jamali, Arsalan Ahmed Mugheri, Nagji Sodho, Abdul Waheed Mastoi, Aftab Kandhro
Summary: Green hydrogen has the potential to transition to a pollution-free energy infrastructure. This study proposes a solution to produce hydrogen during the photoelectrochemical process, offering greater stability and control over chemical reactions. Techno-economic assessments show the efficiency and economic feasibility of co-producing value-added chemicals to enhance green hydrogen production.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Danpeng Cheng, Wuxin Sha, Qigao Han, Shun Tang, Jun Zhong, Jinqiao Du, Jie Tian, Yuan-Cheng Cao
Summary: LiNixCoyMn1-x-yO2 (NCM) is a critical cathode material for lithium-ion batteries in electric vehicles. The aging of cathode/electrolyte interfaces leads to capacity degradation and long-term cycle instability. A novel neural network model called ACGNet is developed to predict electrochemical stability windows of crystals, allowing for high-throughput screening of coating materials. LiPO3 is identified as a promising coating material with high oxidation voltage and low cost, which significantly improves the cycle stability of NCM batteries. This study demonstrates the accuracy and potential of machine learning in battery materials.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
P. Mohana, R. Yuvakkumar, G. Ravi, S. Arunmetha
Summary: This study successfully fabricates a non-noble CuO/NiO/rGO nanocomposite and investigates its electrocatalytic performance for oxygen evolution reaction in alkaline environment. The experimental results demonstrate that the electrocatalyst exhibits high activity and good stability, offering a new synthetic approach for sustainable energy production.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Qiong Qu, Jing Guo, Hongyu Wang, Kai Zhang, Jingde Li
Summary: In this study, a bifunctional electrode host design consisting of carbon nanofibers implanted ordered porous Co-decorated Al2O3 supported on carbon nanotube film (CNTF) was proposed to address the shuttling effect of lithium polysulfides (LiPSs) and dendrite formation of metal lithium anode in lithium-sulfur (Li-S) batteries. The electrode exhibited excellent conductivity, efficient confinement of LiPSs, and catalytic conversion performance, resulting in high initial capacity and good capacity retention during cycling. As an anode, the electrode showed excellent Li+ diffusion performance and uniform lithium growth behavior, achieving a dendrite-free lithium electrode. The flexible pack cell assembled from these electrodes delivered a specific capacity of 972 mAh g(-1) with good capacity retention.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Hong Zhang, Jin-Peng Yu, Chen Chen, Cheng-Yong Shu, Guang-Yu Xu, Jie Ren, Kai Cui, Wen-Fang Cai, Yun-Hai Wang, Kun Guo
Summary: Spray coating of acetylene black nanoparticles onto stainless steel mesh can enhance its biofilm formation ability and current density, making it a promising electrode material for microbial electrochemical systems. The spray coating method is simple, cost-effective, and suitable for large-size stainless steel electrodes.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Binpeng Hou, Jingjin Chen, Li-Hong Zhang, Xiaowen Shi, Zizhong Zhu
Summary: The electrochemical performance of Li1.20Mn0.44Ni0.32Co0.04O2 and its oxygen-deficient phase Li1.20Mn0.44Ni0.32Co0.04O1.83 was studied through first-principles calculations. The results show that the oxygen-deficient phase has a higher theoretical capacity but lower voltage platform and higher chemical activity compared to the pristine phase.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Yating Du, Sayoko Shironita, Daisuke Asakura, Eiji Hosono, Yoshitsugu Sone, Yugo Miseki, Eiichi Kobayashi, Minoru Umeda
Summary: This study investigates the effect of high- and low-temperature environments on the charge-discharge performance of a Li-ion battery. The deterioration mechanisms of the battery at different temperatures are analyzed through various characterization techniques. The results indicate that the battery performance deteriorates more significantly at a low-temperature environment of 5 degrees C compared to higher temperatures. The understanding of the deterioration mechanisms can contribute to the development of safer battery usage methods.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Si-Si Shi, Zhi-Xiang Yuan, Fei Zhang, Ping Chen
Summary: In this study, a new nano-electrocatalyst was prepared, which exhibited superior electrocatalytic activity for the reduction of NO2- to ammonia in a neutral electrolyte, potentially due to the synergistic enhancement between Co3O4-x and Co.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Berna Dalkiran, Havva Bekirog
Summary: This study reports the use of deep eutectic solvents (DES) based on ethylene glycol and urea as low-cost and green electrolytes for enhancing electrochemical detection of natural antioxidants. The study successfully developed a disposable and effective electrochemical sensing platform for simultaneous determination of ascorbic acid (AA) and gallic acid (GA) using NaOH nanorods on a pencil graphite electrode. The proposed electrode showed improved analytical performance, with higher peak currents and shifted oxidation potentials in DES compared to BR buffer medium.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Sijun Ren, Jianguo Huang
Summary: In this study, a novel bio-inspired nanofibrous WO3/carbon composite was synthesized using a facile hydrothermal method. The three-dimensional network structure of the composite alleviated the volume expansion of WO3 nanorods and enhanced the charge-transport kinetics. The optimized composite exhibited superior lithium storage properties.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Zhilong Zheng, Yu Chen, Hongxia Yin, Hengbo Xiao, Xiangji Zhou, Zhiwen Li, Ximin Li, Jin Chen, Songliu Yuan, Junjie Guo, Haibin Yu, Zhen Zhang, Lihua Qian
Summary: This study found that interstitial Zn cations in CoMoO4 can modulate the dissolution kinetics of Mo cations and improve the OER performance. The interstitial Zn cations can prevent the dissolution of Co cations at high potential, enhancing the durability of the catalyst.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Xiaobo Lin, Shern R. Tee, Debra J. Searles, Peter T. Cummings
Summary: Molecular dynamics simulations using the constant potential method were used to investigate the charging dynamics and charge storage of supercapacitors. The simulations revealed that the water-in-salt electrolyte exhibited the highest charge storage and significantly higher capacitance on the negative electrode. The varying contributions of different electrode regions to supercapacitor performance were also demonstrated.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Wiktoria Lipinska, Vita Saska, Katarzyna Siuzdak, Jakub Karczewski, Karol Zaleski, Emerson Coy, Anne de Poulpiquet, Ievgen Mazurenko, Elisabeth Lojou
Summary: The spatial distribution of enzymes on electrodes is important for bioelectrocatalysis. In this study, controlled spatial distribution of gold nanoparticles on Ti nanodimples was achieved. The efficiency of enzymatic O2 reduction was found to be influenced by the size of the gold nanoparticles and their colocalization with TiO2. The highest stability of enzymatic current was observed with the largest gold nanoparticles.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Tariq M. Al-Hejri, Zeenat A. Shaikh, Ahmed H. Al-Naggar, Siddheshwar D. Raut, Tabassum Siddiqui, Hamdan M. Danamah, Vijaykumar V. Jadhav, Abdullah M. Al-Enizi, Rajaram S. Mane
Summary: This study explores a promising self-growth approach for the synthesis of nickel hydroxide (Ni(OH)2) nanosponge-balls on the surface of a nickel-foam (NiF) electrode. The modified NiF electrode, named Ni(OH)2@NiF, shows distinctive nanosponge-ball morphology and demonstrates excellent energy storage capability and electrocatalytic performance in both hydrogen and oxygen evolution reactions.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Rafael Del Olmo, Gregorio Guzman-Gonzalez, Oihane Sanz, Maria Forsyth, Nerea Casado
Summary: The use of Lithium-Ion Batteries (LIBs) is becoming increasingly extensive, and it is important to optimize the devices to achieve their maximum practical specific capacity. In this study, mixed ionic-electronic conducting (MIEC) binders based on PEDOT:PSS and PEDOT: PDADMA-TFSI were developed for Li-ion cathodes, and their performance was compared with conventional formulations. The influence of electrode formulations, including the addition of conducting carbon and an Organic Ionic Plastic Cristal (OIPC), was also analyzed. The proposed binders showed improved performance compared to conventional formulations with different electrolyte types and active materials.
ELECTROCHIMICA ACTA
(2024)
