Article
Green & Sustainable Science & Technology
Laura E. Dalton, Dustin Crandall, M. Pour-Ghaz
Summary: This study investigates the formation of carbonate and reactive transport rate in variably saturated portland cement mortars under the flow of high concentrations of gas, liquid, or supercritical CO2. X-ray computed tomography is used to quantify the microstructural evolution during CO2 flow, and additional analysis techniques are used to further quantify microstructural changes. The study finds that supercritical CO2 moves more rapidly and precipitates more carbonates than liquid or gas CO2 under dry conditions. However, at 50% degree of saturation (DOS), the CO2 state did not affect the transport rate, as each specimen carbonated within the first hour of CO2 exposure. When the pore space is at 50% or 100% DOS, supercritical CO2 did not react more rapidly or result in more carbonate formation compared to gas or liquid CO2. The amount of Ca(OH)(2) that contributes to CaCO3 formation is correlated to the DOS.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2022)
Article
Chemistry, Physical
Qi Hua, Nawal M. M. Alghoraibi, Xinyi Chen, Andrew A. A. Gewirth
Summary: In this study, Pt electrodes with high roughness factors were prepared by an electrodeposition method. These rough electrodes exhibited a linear response in methanol oxidation reaction in both acidic and basic electrolytes, and showed better performance compared to previous studies.
Article
Electrochemistry
Dongqin Liu, Guangxing Yang, Qiao Zhang, Hongjuan Wang, Hao Yu, Feng Peng
Summary: The study found that supporting Pt catalyst on FeP-decorated N-CNT can enhance the forward peak current density, showing 3.4 times higher than commercial Pt/C. The improved performance is attributed to the change in electronic state of Pt nanoparticles through the electronic interaction between Pt and FeP, which mitigates CO poisoning.
Article
Chemistry, Physical
Yuhui Li, Enze Zhu, Juan Yu, Jie Yu, Jirong Yang, Weiping Liu, Xiaoyin Cui, Xikun Yang, Yingjie Zhang, Mingli Xu
Summary: This study utilized a novel carbon fiber paper loaded with reduced graphene oxide (rGO) as the substrate, and Pt-Ni nanoparticles were electro-deposited on it to prepare a high-performance integrated electrode. The electrochemical tests revealed excellent performance of the integrated electrodes towards methanol oxidation. Additionally, significant changes in morphology and electrocatalytic performance were observed after annealing under a reducing atmosphere.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Engineering, Environmental
John S. Loring, Odeta Qafoku, Christopher J. Thompson, Ashley S. McNeill, Monica Vasiliu, David A. Dixon, Quin R. S. Miller, B. Peter McGrail, Kevin M. Rosso, Eugene S. Ilton, Herbert T. Schaef
Summary: The study found that under different CO2/CH4 ratios, different montmorillonites exhibit different swelling behaviors. CO2 facilitates the expansion of Na-clay, while CH4 cannot induce expansion. For Cs-clay, even in the absence of H2O, CO2 can cause expansion.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Ye A. Vaksler, D. Benedis, A. A. Dyshin, R. D. Oparin, N. T. Correia, F. Capet, S. Shishkina, M. G. Kiselev, A. Idrissi
Summary: This study successfully synthesized a single crystal of mefenamic acid and nicotinamide co-crystal using supercritical fluid, and determined the effect of temperature, solid mixture composition, and co-crystallization time on the synthesized solid, demonstrating the synthesis of the co-crystal.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Energy & Fuels
Yong Seok Kim, Jae Wook Lee, Byeongkyu Kim, Jong Wook Bae, Chan-Hwa Chung
Summary: A carbon-neutralized direct methanol fuel cell (DMFC) with two bifunctional electrodes, Pd-Ag and Pt-Zn, has been developed in this study. The system operates in two modes: fuel-cell mode and spontaneous CO2 reduction mode. The Pd-Ag electrode oxidizes methanol to CO2 and generates electricity in the fuel-cell mode, while CO2 is spontaneously reduced to CO on Pd-Ag in the next step. In contrast, Pt catalyzes oxygen reduction and Zn is sacrificially oxidized in the fuel-cell and CO2 reduction modes, respectively. The power densities in the fuel-cell and CO2 reduction modes are 12.11 mW/cm² and 11.76 mW/cm², respectively, with faradaic efficiencies of 98.81% for CO2 and 89.11% for CO.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Chemistry, Inorganic & Nuclear
Shuyue Xie, Fangfei Liu, Tursun Abdiryim, Xiong Liu, Ruxangul Jamal, Yanyan Song, Mariyam Niyaz, Yajun Liu, Hujun Zhang, Xinsheng Tang
Summary: In this study, platinum-palladium bimetallic nanoparticles were successfully loaded onto poly(3,4-ethylenedioxythiophene) (PEDOT)-embellished titanium carbide nanosheets through a facile and rapid chemical reduction-assisted one-pot hydrothermal process. The resulting Ti(3)C(2)Tx/PEDOT/Pt-Pd catalyst demonstrated excellent electrocatalytic activity for the methanol oxidation reaction (MOR), with a larger electrochemical activity surface area and higher mass activity compared to other catalysts. The hybrid structure formed between PEDOT and Ti(3)C(2)Tx provided a sizable active surface and more active sites, enhancing the dispersion of Pt-Pd NPs and facilitating mass transfer. The Schottky junctions between PEDOT and Pt-Pd NPs contributed to charge transfer, while the electronic effects and synergistic interactions between the support and catalyst favored the catalytic activity.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Thomas Len, Mounib Bahri, Ovidiu Ersen, Yaya Lefkir, Luis Cardenas, Ignacio J. Villar-Garcia, Virginia Perez Dieste, Jordi Llorca, Noemie Perret, Ruben Checa, Eric Puzenat, Pavel Afanasiev, Franck Morfin, Laurent Piccolo
Summary: In Mo/TiO2 catalysts, the interaction between ultradispersed molybdate species and the support structure of rutile titanium nanorods plays a crucial role in achieving high activity and selectivity for methanol production.
Article
Chemistry, Multidisciplinary
Chao Luan, Xuanhua Zhang, Chao Wang, Mengyin Liao, Wenyuan Xu, Bohong Chen
Summary: This article investigates the use of carbon materials derived from metal-organic frameworks (MOFs) as supports for high-performance anode electrocatalysts in direct methanol fuel cells (DMFCs). The Ni-embedded nitrogen-doped carbon (Ni-NC) synthesized from MOFs showed improved mass activity in the methanol oxidation reaction (MOR) compared to commercial Pt/C, thanks to the synergetic effect of Pt, Ni, and NC. This work provides a flexible strategy for constructing advanced MOR electrocatalysts using MOF-derived carbon materials.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Physical
Agus R. Poerwoprajitno, Lucy Gloag, John Watt, Soshan Cheong, Xin Tan, Han Lei, Hassan A. Tahini, Aaron Henson, Bijil Subhash, Nicholas M. Bedford, Benjamin K. Miller, Peter B. O'Mara, Tania M. Benedetti, Dale L. Huber, Wenhua Zhang, Sean C. Smith, J. Justin Gooding, Wolfgang Schuhmann, Richard D. Tilley
Summary: Single Pt atom catalysts with high exposure are key targets to enhance electrocatalytic activity, and PtRu alloy nanoparticles are the most active catalysts for the methanol oxidation reaction. This study demonstrates a process to create single-Pt-atom-on-Ru catalysts by growing and spreading Pt islands on Ru branched nanoparticles. The formation of a stable single atom structure is driven by the formation of strong Pt-Ru bonds and the lowering of the surface energy of the Pt islands, resulting in a high current density and mass activity for the methanol oxidation reaction over time.
Article
Chemistry, Multidisciplinary
Zhengcheng Wang, Shangyan Zhou, Wei Liao, Qian Zhou, Meida Chen, Jin Long, Qingmei Wang
Summary: Designing efficient and inexpensive Pt-based catalysts is crucial for the commercialization of direct methanol fuel cells. In this study, highly catalytic performance PtFe alloys supported on multiwalled carbon nanotubes (MWCNTs) decorated with nitrogen-doped carbon (NC) were successfully prepared by co-engineering the surface composition and electronic structure. The Pt1Fe3@NC/MWCNTs catalyst exhibited significantly improved mass activity in methanol oxidation reaction and lower CO oxidation initial potential compared to the pristine Pt/C catalyst, thanks to the optimal surface compositions, anti-corrosion ability of MWCNTs, strong electron interaction, and the N-doped carbon layer.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Dashu Pan, Yubing Xue, Songtao Xiao, Yinggen Ouyang, Feng Zuo, Fuyan Lou, Xiang Li
Summary: Radioactive UO2 powder was prepared by hydrothermal method and a set of Pt-xUO(2)/C catalysts were synthesized by impregnation method to improve the low activity and easy poisoning of anode Pt/C catalysts in a direct ethanol fuel cell. The electrochemical and single cell test results confirmed that the catalytic performance of Pt-10% UO2/C was significantly better than Pt/C. It is speculated that the synergistic effect of Pt and U enhances the catalytic activity, while UO2 improves the resistance to CO poisoning.
Article
Chemistry, Multidisciplinary
Guo Zhi, Wenxin Wang, Yang Zhou, Ligang Feng
Summary: In this study, an effective catalyst system was demonstrated by coupling Pt nanoparticles with ZIF-67-derived CoP/NC support for methanol oxidation reaction (MOR) in acidic and alkaline solutions. The Pt-CoP/NC catalyst showed high catalytic activity and stability due to the oxophilic properties of CoP and the strong metal-support interaction. It exhibited significantly higher forward peak current density compared to the Pt-Co/NC and commercial Pt/C catalysts. The Pt-CoP/NC catalyst also demonstrated excellent poisoning resistance.
Article
Chemistry, Physical
Tianen Zhang, Lifei Ji, Yani Yan, Junming Zhang, Yanrong Li, Weize Li, Wei Yan, Yu Han, Jinhong Zheng, Guang Li, Yanxia Jiang, Shigang Sun
Summary: In this study, a graphitized porous carbon (PC) was successfully prepared as a supported material and used to synthesize disordered A1-PtZn NPs. The ordered PtZn intermetallic compound (L10-PtZn/PC) and PtZn-skin (L10-PtZn/PC-acid) catalysts were obtained through a series of treatments. The L10-PtZn/PC-acid catalyst exhibited higher activity and stability in methanol oxidation reaction (MOR) compared to commercial Pt/C. The Pt-skin of L10-PtZn/PC-acid provided protection to subsurface Zn and maintained the structural stability effectively. The work presents a novel strategy to develop high-performance Pt-based nanocatalysts for direct methanol fuel cells. Rating: 9/10.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Polymer Science
Victor E. Sizov, Vadim V. Zefirov, Yulia A. Volkova, Danil Gusak, Elena P. Kharitonova, Igor I. Ponomarev, Marat O. Gallyamov
Summary: In this study, novel composite Celgard-based films coated with PIM-1 were proposed for improving the performance of vanadium redox flow batteries (VRB) membranes. The deposited PIM-1 effectively reduced the pores diameter and influenced the transport properties of the composite film. The composite film showed enhanced ion selectivity and proton conductivity in aqueous VRB applications.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Chemistry, Physical
I. Elmanovich, A. Stakhanov, E. Kravchenko, S. Stakhanova, A. A. Pavlov, M. M. Ilyin, E. P. Kharitonova, M. O. Gallyamov, A. R. Khokhlov
Summary: The thermal oxidation of polyethylene was studied in oxygen-enriched supercritical CO2 and pure oxygen environments, showing that the oxygen content strongly affects the product characteristics. The volatile products were analyzed using various techniques, revealing that supercritical CO2 has a more pronounced influence at lower oxygen to polymer mass ratios.
JOURNAL OF SUPERCRITICAL FLUIDS
(2022)
Article
Electrochemistry
Leonid Pugolovkin, Eduard E. Levin, Natalia A. Arkharova, Anton S. Orekhov, Sergey A. Urvanov, Vladimir Z. Mordkovich, Galina A. Tsirlina
Summary: In this study, we report the cathodic deposition of birnessite oxide from permanganate alkaline solutions into porous flexible cloth consisting of carbon nanotubes. By using electron microscopy techniques, we investigated the distribution of the oxide in the pores. The deposition mode was found to affect the oxide distribution, with the intermittent potentiostatic mode facilitating the penetration of the solvent into the cloth pores and resulting in a more homogeneous hybrid material.
ELECTROCHIMICA ACTA
(2022)
Article
Polymer Science
Gleb O. Vasiliev, Marina A. Pigaleva, Inesa V. Blagodatskikh, Dmitrii M. Mazur, Eduard E. Levin, Alexander V. Naumkin, Elena P. Kharitonova, Marat O. Gallyamov
Summary: This study explores a method of chitosan decomposition using peroxycarbonic acid solution under high CO2 pressure. The results show that chitosan oligomers with suitable molecular weight can be obtained even with low hydrogen peroxide concentrations and short processing times. The obtained polymer exhibits good ability to form porous matrices, but its thermal stability is somewhat decreased.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Electrochemistry
K. A. Dosaev, S. Ya. Istomin, D. A. Strebkov, G. A. Tsirlina, E. V. Antipov, E. R. Savinova
Summary: Using RDE and CV techniques, electrochemical behavior of different AMn2O4 spinel oxides in an alkaline solution, especially in the ORR, was studied. Surface modifications were observed on the studied spinels (except for MgMn2O4) during potential cycling, contact with alkaline solution, and electrode preparation. Mn3O4 spinel showed the strongest surface modifications due to the presence of easily oxidizable and unstable Mn(II). This work highlights the importance of degradation processes on the electrochemical characteristics of materials in the field of electrocatalysis.
ELECTROCHIMICA ACTA
(2022)
Article
Electrochemistry
Leonid V. Pugolovkin, Galina A. Tsirlina
Summary: The recharging processes of Birnessite in neutral (sodium sulfate) and alkaline (sodium hydroxide) solutions are compared. The width of the potential interval for Birnessite recharging in neutral solutions is found to depend on Birnessite loading and convection in solution, while in alkaline solutions, the potential interval is narrower. This difference can be explained by changes in local pH during recharging in neutral solutions.
JOURNAL OF APPLIED ELECTROCHEMISTRY
(2023)
Article
Chemistry, Physical
Galina A. Tsirlina
Summary: This article collects and discusses various examples of electrodeposition accompanied by current and/or potential oscillations, and explores the possibilities of using periodic changes in electrochemical responses to control and monitor the size, morphology, and composition of electrodeposition products. A brief comparison with other template-free electrodeposition techniques is also presented.
CURRENT OPINION IN ELECTROCHEMISTRY
(2023)
Editorial Material
Electrochemistry
Laszlo Peter, Galina Tsirlina
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Polina S. Kazaryan, Daniil K. Gritsevich, Marat O. Gallyamov, Anastasiya A. Pestrikova, Alexander A. Gulin, Alina V. Kirianova, Mikhail S. Kondratenko
Summary: In modern life, people encounter various problems caused by adhesion, such as clothes getting dirty, useful materials sticking to containers, and water freezing on airplane wings. Slippery liquid-infused porous surfaces (SLIPSs) could potentially solve these issues. This study focuses on the relationship between the structure of polymer films and wetting effects, aiming to understand and improve the properties of SLIPS. The researchers proposed a new method to synthesize slippery coatings on smooth and porous substrates using eco-friendly CO2 solutions, and demonstrated the effectiveness of this technique on various surfaces.
Article
Chemistry, Physical
Xingxing Jiao, Alina V. Kirianova, Xieyu Xu, Olesya O. Kapitanova, Victor A. Krivchenko, Filipp S. Napolskiy, Valentyn S. Volkov, Marat O. Gallyamov, Yangyang Liu
Summary: Conductive additive is an indispensable key material in the high-current charging and discharging processes of lithium-ion batteries. Its addition helps to improve the poor conductive performance of the electrode-active material, reduce the internal resistance and polarization of the electrode, and enhance the overall performance of the battery.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Polymer Science
Evgenii I. Perepelkin, Maria A. Sinolits, Gennadii A. Badun, Maria G. Chernysheva, Nelya M. Anuchina, Sergey S. Abramchuk, Eduard E. Levin, Natalia P. Bakuleva, Dmitrii A. Popov, Ivan S. Chaschin
Summary: Firmly bonded antimicrobial protective coating made of chitosan nanoparticles has been developed for enhancing the functionality of medical devices, especially bioprosthetic heart valves in cardiac surgery. The coating is obtained using a biocompatible and self-neutralizing carbonic acid as a polymer solvent. This unique approach allows the formation of stable chitosan nanoparticles in carbonic acid solution and the doped nanoparticles show enhanced deposition and antimicrobial activity when applied on the biomatrix.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Electrochemistry
Leonid V. Pugolovkin, Eduard E. Levin, Natalya A. Arkharova, Anton S. Orekhov, Denis E. Presnov, Olga V. Cherstiouk, Galina A. Tsirlina
Summary: In this study, we report the oscillations of current during the deposition of manganese and birnessite from manganese solutions. The oscillations are influenced by solution convection and the morphology of the deposits. The differences in microstructure between anodic and cathodic deposits are attributed to specific crystallographic features. The periodic current decrease is likely due to diffusion limitations in growing porous layers, while the subsequent current increase corresponds to dendrite-like growth of a small number of crystals in the outer diffusion layer.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2023)
Review
Chemistry, Physical
Galina A. Tsirlina
Summary: This article points out a problem with interpreting data for oxides and oxide-based compositions in aqueous alkaline medium, specifically in terms of hydrogen storage. The reported potentials for both charge and discharge exceed the equilibrium potential for oxygen, indicating a highly oxidative environment with a high risk of side reactions. Furthermore, the reported record values for discharge capacity do not align with any possible type of hydrogen bonding in oxide lattice.
CURRENT OPINION IN ELECTROCHEMISTRY
(2023)
Article
Electrochemistry
A. P. Leontiev, D. A. Bograchev, D. N. Khmelenin, G. A. Tsirlina, K. S. Napolskii
Summary: This study investigates the initial stages of templated electrodeposition of gold inside the pores of anodic aluminium oxide. Experimental observations and numerical simulations were used to analyze the growth process of gold nanostructures.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2023)
Article
Electrochemistry
Galina A. Tsirlina
Summary: This article shares the author's experience of teaching electrochemistry at an individualized level. It suggests solving problems based on experimental data published in the literature, in addition to lectures and seminars. Through discussing examples, the article illustrates theory-experiment interactions using an electrostatics-based model for the electron transfer elementary step. The author believes that this pedagogical approach is suitable for applied electrochemistry, and although time-consuming, there is no alternative approach to generate qualified electrochemists for the future.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2023)
